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CN108531816A - A kind of 500MPa grades of steel for engineering machinery and its manufacturing method - Google Patents

A kind of 500MPa grades of steel for engineering machinery and its manufacturing method Download PDF

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Publication number
CN108531816A
CN108531816A CN201810513565.8A CN201810513565A CN108531816A CN 108531816 A CN108531816 A CN 108531816A CN 201810513565 A CN201810513565 A CN 201810513565A CN 108531816 A CN108531816 A CN 108531816A
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steel
engineering machinery
steel plate
temperature
molten
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CN108531816B (en
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冯勇
吴俊平
谯明亮
李明
霍松波
刘继宏
翟冬雨
潘中德
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Nanjing Iron and Steel Co Ltd
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Nanjing Iron and Steel Co Ltd
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Priority to MYPI2020006044A priority patent/MY194384A/en
Priority to PCT/CN2018/108992 priority patent/WO2019223209A1/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese

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  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

The invention discloses a kind of 500MPa grades of steel for engineering machinery and its manufacturing method, which includes the ingredient of following mass percent：C：0.12~0.23%, Si：0.10~0.60%, Mn：0.80~1.90%, P：＜ 0.018%, S：＜ 0.010%；And it is selected from Cr：0~0.50%, Ni：0~0.60%, Mo：0~0.45%, Cu：0~0.40%, Nb：0~0.060%, V：0~0.15%, Ti：0~0.12%, B：0~0.0030%, Al：It is one or more in 0.010~0.050%；Surplus is Fe and inevitable impurity.Its metallographic structure is uniform tiny martensite high tempering tissue, to have good mechanical property and fatigue behaviour.Its fatigue life, more existing engineering machinery steel grade was obviously improved.

Description

A kind of 500MPa grades of steel for engineering machinery and its manufacturing method
Technical field
The present invention relates to a kind of steel alloy technologies, and in particular to a kind of 500MPa grades of steel for engineering machinery and its manufacturer Method.
Background technology
Currently, steel for engineering machinery uses two kinds of Q235B and SS400, such as excavator swing arm dipper substantially, load motor-driven Arm etc..Its yield strength meets room temperature impact property, service life is within 30000h in 235MPa.Its yield strength and tired The labor service life is apparent insufficient.
Application No. is 201310289099.7, entitled " a kind of 500MPa grades of Ultra-fine Grained steel for engineering machinery and manufacturer The Chinese patent of method ", discloses the steel for engineering machinery that a kind of yield strength is more than 500MPa, and C content is 0.04~ 0.08%, it is unfavorable for quenched martensite and is formed.The steel plate is there are cost of alloy height, and deformed steel strip, performance is unstable, blanking deformation The problems such as larger.
Invention content
Goal of the invention：In order to overcome the deficiencies of existing technologies, the present invention provides a kind of 500MPa grades of steel for engineering machinery, The yield strength of the steel grade is more than 500MPa, has higher fatigue life.
It is a further object of the present invention to provide a kind of manufacturing method of 500MPa grades of steel for engineering machinery, this method can give birth to Produce the 500MPa grade steel for engineering machinery having compared with high fatigue life.
Technical solution：A kind of 500MPa grades of steel for engineering machinery of the present invention, including following mass percent at Point：C：0.12~0.23%,
Si：0.10~0.60%,
Mn：0.80~1.90%,
P：＜ 0.018%,
S：＜ 0.010%；
And it is selected from Cr：0~0.50%, Ni：0~0.60%, Mo：0~0.45%, Cu：0~0.40%, Nb：0~ 0.060%, V：0~0.15%, Ti：0~0.12%, B：0~0.0030%, Al：One kind or more in 0.010~0.050% Kind；
Surplus is Fe and inevitable impurity.
The metallographic structure of the 500MPa grades of steel for engineering machinery is uniform tiny martensite high tempering tissue.
The restriction reason of each chemical constituent mass percentage content is as follows in the 500MPa grades of steel for engineering machinery：
C element can dramatically increase matrix strength by solution strengthening, while its content is too low is unfavorable for quenched martensite Formation, but the excessively high welding performance for being also unfavorable for material of C content.Therefore, the present invention C content controlled 0.12~ 0.23% level.
Si is deoxidant element in steelmaking process, and appropriate Si can inhibit the segregation of Mn and P, and O content is excessively high, Mn and P Segregation can all damage toughness, in addition, Si can also generate solution strengthening, Si elements appropriate are conducive to tempered structure performance stabilization Improve.But Si too high levels can form field trash.The present invention controls Si 0.10~0.60%.
Main alloy elements of the Mn as steel plate of the present invention is ferritizing strengthening element, and content is very few not to have conjunction Aurification and quenching effect, again can be very unfavorable to welding performance but content is excessive, and less economical.Therefore, Mn is controlled 0.80~1.90%.
P, S belongs to the harmful element in molten steel, and excessive P, S can be harmful to the toughness of steel, impacted to welding performance, It is easy to form crackle.Theoretically the fewer both elements the better, and P is controlled and controlled in ＜ in ＜ 0.018%, S by the present invention 0.010%；
The elements such as Cr, Ni, Mo, Cu, Nb, V, Ti, B, Al are non-master guide element in this steel grade, wherein a small amount of be added The elements such as Cr, Ni, Mo are conducive to alloying and the quenching of steel grade, and addition Ti, B, Al appropriate etc. can improve quenching degree.But It is that these elements one side not enough economy is excessively added, on the other hand can also forms unnecessary non-metallic inclusion.So root Cooperation is acted on according to alloy to accept or reject, can meet design, is more advantageous to and is saved alloy resource and improve the processing performances such as welding bending. The present invention is acted on according to alloy from Cr on the basis of limiting C, Si, Mn, P, S：0~0.50%, Ni：0~0.60%, Mo：0 ~0.45%, Cu：0~0.40%, Nb：0~0.060%, V：0~0.15%, Ti：0~0.12%, B：0~0.0030%, Al：One or more, Proper Match is chosen in 0.010~0.050% equal elements.
The manufacturing method of a kind of 500MPa grades of steel for engineering machinery of the present invention, under used technical solution includes State step：
(1) smelting molten steel：Preparation meets into the molten steel being grouped as；
(2) it is cast into base：Molten steel is sent into conticaster whole process argon for protecting pouring, while electromagnetic agitation, pulling rate 0.75~ 1.2m/min obtains strand；
(3) heating strand：Strand is evenly heated 3.5~4.5 hours at 1100~1220 DEG C；
(4) it rolls：Using four roll reversing roller two-phase control rollings, roughing rolls reduction ratio and is more than 60%, roughing open rolling temperature 1070~1180 DEG C of degree, 890~950 DEG C of two-stage start rolling temperature, 820~900 DEG C of finishing temperature obtains steel plate；
(5) control cooling：After accelerating outlet steel plate residual water purging in cold-zone clean, steel plate anti-red temperature 650~690 is measured ℃；
(6) it aligns：Steel plate is aligned, 3~6mm/m of control aligning unevenness；
(7) bead：Remove surface of steel plate iron scale；
(8) to remove iron scale steel plate be heat-treated to get.
Wherein, prepared composition forms satisfactory molten steel in step (1), includes the following steps：
(1.1) molten iron pre-processes, and makes the S in molten iron：＜ 0.010%；
(1.2) converter is added in pretreated molten iron, deoxidation alloying, the conjunction of addition is smelted and carried out using BOF methods Gold matches the 90% of dosage for alloy in design molten steel composition；
(1.3) LF stoves refine 15~30min, and fine tuning alloying component makes alloying component meet the requirements, and promotes liquid steel temperature；
(1.4) RH Fruit storages 15-30 minutes, RH BOTTOM ARGON BLOWINGs rationally stir and the removal non-metallic inclusion that floats, Reduce nitrogen hydrogen-oxygen content；
(1.5) feeding calcium line purify molten steel, make strip MnS non-metallic inclusions become dispersion, shorten spheroidization to get.
Heat treatment is that steel plate is first heated to 880~920 using nitrogen protection non-oxidation roller hearth furnace in the step (8) ℃；Then the quenching of roller press type water knife is carried out to steel plate；It is handled again in 550~660 DEG C of high temperings.
Advantageous effect：500MPa grades of steel for engineering machinery of the present invention, it is secondary outside stove by rational composition design Refining, and unique manufacturing process is used, make steel cleaning, crystal grain refinement, improves obdurability.The metallographic structure of the steel grade is equal Even and fine small martensite high tempering tissue, to obtain good mechanical property and fatigue behaviour, the yield strength of steel grade Reach 500MPa or more, tensile strength reaches 600MPa or more, which is suitable for engineering machinery, and fatigue life is more existing Engineering machinery steel grade promotes 30% or more, meets the subzero 40 DEG C of low-temperature flexibility demands of engineering machinery.And the alloy member of the steel grade Element can act on cooperation according to alloy and accept or reject, and effectively control the production cost of steel grade.
Specific implementation mode
In the following, be described in further details to the present invention in conjunction with the embodiments.
It is more than in order to which existing steel for engineering machinery is upgraded to yield strength from the Q235B of yield strength 235MPa The endurance engineering machinery material of new generation of 500MPa, the present invention propose a kind of 500MPa grades of steel for engineering machinery, the steel grade Ingredient in terms of quality percentage, including C：0.12~0.23%, Si：0.10~0.60%, Mn：0.80~1.90%, P：＜ 0.018%, S：＜ 0.010%；And it is selected from Cr：0~0.50%, Ni：0~0.60%, Mo：0~0.45%, Cu：0~ 0.40%, Nb：0~0.060%, V：0~0.15%, Ti：0~0.12%, B：0~0.0030%, Al：0.010~0.050% In it is one or more；Surplus is Fe and inevitable impurity.By special manufacturing process, the metallographic structure of the steel grade is Uniformly tiny martensite high tempering tissue, to obtain good mechanical property and fatigue behaviour.
And a kind of manufacturing method of 500MPa grades of steel for engineering machinery of the present invention, used technical solution include Following step：
(1) following step smelting is used to meet into the molten steel being grouped as first：Molten iron pretreatment is first carried out, is made in molten iron S：And then pretreated molten iron is added converter, is smelted using BOF methods and carry out deoxidation alloying, phase by ＜ 0.010% Between, the alloy of addition is to design alloy in molten steel composition to match the 90% of dosage；Then by above-mentioned molten steel be sent into LF stoves refining 15~ 30min, deoxidation, fine tuning alloying component make alloying component meet the requirements, and promote liquid steel temperature by technique；Molten steel is sent into RH essences Furnace Fruit storage 15-30 minutes, RH BOTTOM ARGON BLOWINGs rationally stir and the removal non-metallic inclusion that floats, and reduce nitrogen hydrogen-oxygen and contain Amount, control nitrogen content of molten steel are not higher than 38ppm, and hydrogen content is not higher than 1.5ppm, and oxygen content is not higher than 20ppm；Then calcium is fed Line purifies molten steel, so that strip MnS non-metallic inclusions is become dispersion, the spheroidization that shortens is to get satisfactory molten steel.
(2) it is cast into base：Molten steel is sent into conticaster whole process argon for protecting pouring, while electromagnetic agitation mitigation low power is inclined Analysis, and 0.75~1.2m/min of pulling speed of continuous casting is controlled, obtain strand；
(3) heating strand：Strand is evenly heated 3.5~4.5 hours at 1100~1220 DEG C, prevents heating time mistake Short-range missile causes the heating of strand center impermeable, meanwhile, the reasonable controlled rolling time, prevents heating time mistake suitable for rolling The long waste for causing the energy；
(4) it rolls：Using four roll reversing roller two-phase control rollings, roughing rolls reduction ratio and is more than 60%, roughing open rolling temperature 1070~1180 DEG C of degree, 890~950 DEG C of two-stage start rolling temperature, 820~900 DEG C of finishing temperature obtains steel plate；
(5) control cooling：After accelerating outlet steel plate residual water purging in cold-zone clean, steel plate anti-red temperature 650~690 is measured ℃；
(6) it aligns：Steel plate is aligned, 3~6mm/m of control aligning unevenness；
(7) bead：Remove surface of steel plate iron scale；
(8) steel plate for removing iron scale is heat-treated, specifically, first using nitrogen protection non-oxidation roller hearth furnace by steel Plate is heated to 880~920 DEG C；Then the quenching of roller press type water knife is carried out to steel plate；It is handled again in 550~660 DEG C of high temperings, i.e., .
Embodiment one, 75mm specification Q500E steel plates, includes the ingredient C of following mass percents：0.18%, Si： 0.27%, Mn：1.53%, P：0.011%, S：0.006%, Cr：0.25%, V：0.035%, Ti：0.019%, B： 0.0009%, surplus is Fe and inevitable impurity.After steelmaking alloy deoxidation, LF refining 25 minutes, RH vacuum refinings take off Gas 30 minutes makes nitrogen content of molten steel be not higher than 38ppm, and hydrogen content is not higher than 1.5ppm, and oxygen content is not higher than 20ppm；Slab connects Casting, pulling rate 0.75m/min；Reheating 3.8h makes strand central temperature reach 1170 DEG C, and 1120 DEG C of start rolling temperature, two sections roll 890 DEG C, 830 DEG C of finishing temperature, reduction ratio 61%；650 DEG C of steel plate red temperature；Align 3mm/m；890 DEG C of hardening heat, tempering 650 DEG C of temperature.Mechanical property yield strength 530MPa, tensile strength 620MPa, elongation percentage 21%, -40 DEG C of ballistic work 186J, 191J,197J(10*10mm)。
Embodiment two, 10mm specification Q500E steel plates, includes the ingredient C of following mass percents：0.15%, Si： 0.23%, Mn：1.49%, P：0.013%, S：0.005%, Cr：0.17%, V：0.033%, Ti：0.016%, B： 0.0011%, surplus is Fe and inevitable impurity.After steelmaking alloy deoxidation, LF refining 30 minutes, RH vacuum refinings take off Gas 25 minutes makes nitrogen content of molten steel be not higher than 38ppm, and hydrogen content is not higher than 1.5ppm, and oxygen content is not higher than 20ppm；Slab connects Casting, pulling rate 1.2m/min；Reheating 4.0h makes strand central temperature reach 1180 DEG C, and 1140 DEG C of start rolling temperature, two sections roll 900 DEG C, 850 DEG C of finishing temperature, reduction ratio 65%；680 DEG C of steel plate red temperature；Align 5mm/m；900 DEG C of hardening heat, tempering temperature 650 DEG C of degree.Mechanical property yield strength 545MPa, tensile strength 650MPa, elongation percentage 20%, -40 DEG C of ballistic works 97J, 99J, 93J(5*10mm)。
Embodiment three, 22mm specification Q500E include the ingredient C of following mass percents：0.16%, Si：0.20%, Mn： 1.33%, P：0.013%, S：0.005%, Ni：0.20%, Nb：0.026%, Ti：0.016%, B：0.0011%, surplus is Fe and inevitable impurity.After steelmaking alloy deoxidation, LF refining 26 minutes, RH vacuum refinings deaerate 29 minutes, make molten steel Nitrogen content is not higher than 38ppm, and hydrogen content is not higher than 1.5ppm, and oxygen content is not higher than 20ppm；Sheet billet continuous casting, pulling rate 1.2m/min； Reheating 4.2h makes strand central temperature reach 1190 DEG C, and 1140 DEG C of start rolling temperature, two sections roll 950 DEG C, finishing temperature 850 DEG C, reduction ratio 65%；690 DEG C of steel plate red temperature；Align 6mm/m；900 DEG C of hardening heat, 640 DEG C of temperature.Mechanical property Can yield strength 530MPa, tensile strength 645MPa, elongation percentage 22%, -40 DEG C of ballistic work 192J, 190J, 192J (10* 10mm)。
Example IV, 8mm specification Q500E include the ingredient C of following mass percents：0.15%, Si：0.23%, Mn： 1.26%, P：0.013%, S：0.005%, Mo：0.17%, Al：0.027%, surplus is Fe and inevitable impurity.Steel-making After alloying deoxidation, LF refining 28 minutes, RH vacuum refinings deaerate 28 minutes, and nitrogen content of molten steel is made to be not higher than 38ppm, hydrogen content Not higher than 1.5ppm, oxygen content is not higher than 20ppm；Sheet billet continuous casting, pulling rate 1.0m/min；Reheating 4.0h makes strand central temperature Reach 1175 DEG C, 1130 DEG C of start rolling temperature, two sections roll 920 DEG C, 870 DEG C of finishing temperature, reduction ratio 76%；Steel plate red temperature 690℃；Align 6mm/m；910 DEG C of hardening heat, 640 DEG C of temperature.Mechanical property yield strength 540MPa, tensile strength 660MPa, elongation percentage 19%, -40 DEG C of ballistic work 86J, 86J, 83J (5*10mm).
Embodiment five, 18mm specification Q500E include the ingredient C of following mass percents：0.17%, Si：0.26%, Mn： 1.50%, P：0.012%, S：0.003%, Cr：0.15%, Cu：0.016%, Al：0.027%, Ti：0.022%, B： 0.0015%, surplus is Fe and inevitable impurity.After steelmaking alloy deoxidation, LF refining 26 minutes, RH vacuum refinings take off Gas 15 minutes makes nitrogen content of molten steel be not higher than 38ppm, and hydrogen content is not higher than 1.5ppm, and oxygen content is not higher than 20ppm；Slab connects Casting, pulling rate 1.0m/min；Reheating 4.0h makes strand central temperature reach 1180 DEG C, and 1135 DEG C of start rolling temperature, two sections roll 920 DEG C, 870 DEG C of finishing temperature, reduction ratio 73%；690 DEG C of steel plate red temperature；Align 6mm/m；910 DEG C of hardening heat, tempering temperature 630 DEG C of degree.Mechanical property yield strength 543MPa, tensile strength 659MPa, elongation percentage 21%, -40 DEG C of ballistic work 126J, 123J,129J(10*10mm)。
Embodiment six, 50mm specification Q500E steel plates, includes the ingredient C of following mass percents：0.12%, Si：0.6%, Mn：0.8%, P：0.017%, S：0.006%, Cr：0.50%, surplus is Fe and inevitable impurity.Steelmaking alloy is de- After oxygen, LF refining 15 minutes, RH vacuum refinings deaerate 30 minutes, and nitrogen content of molten steel is made to be not higher than 38ppm, and hydrogen content is not higher than 1.5ppm, oxygen content are not higher than 20ppm；Sheet billet continuous casting, pulling rate 0.75m/min；Reheating 3.5h makes strand central temperature reach 1100 DEG C, 1070 DEG C of start rolling temperature, two sections of 890 DEG C of rollings, 820 DEG C of finishing temperature, reduction ratio 75%；Steel plate red temperature 650 ℃；Align 4mm/m；880 DEG C of hardening heat, 620 DEG C of temperature.Mechanical property yield strength 542MPa, tensile strength 629MPa, elongation percentage 21%, -40 DEG C of ballistic work 132J, 139J, 130J (10*10mm).
Embodiment seven, 10mm specification Q500E steel plates, includes the ingredient C of following mass percents：0.23%, Si： 0.10%, Mn：1.9%, P：0.013%, S：0.009%, V：0.15%, Ti：0.025wt.%, B：0.003wt.%, surplus For Fe and inevitable impurity.After steelmaking alloy deoxidation, LF refining 15 minutes, RH vacuum refinings deaerate 25 minutes, make steel Water nitrogen content is not higher than 38ppm, and hydrogen content is not higher than 1.5ppm, and oxygen content is not higher than 20ppm；Sheet billet continuous casting, pulling rate 0.9m/ min；Reheating 4.5h makes strand central temperature reach 1220 DEG C, and 1180 DEG C of start rolling temperature, two sections roll 950 DEG C, finishing temperature 900 DEG C, reduction ratio 63%；690 DEG C of steel plate red temperature；Align 5mm/m；920 DEG C of hardening heat, 660 DEG C of temperature.Mechanics Performance yield strength 548MPa, tensile strength 646MPa, elongation percentage 20%, -40 DEG C of ballistic work 55J, 69J, 78J (5*10mm).
Embodiment eight, 22mm specification Q500E include the ingredient C of following mass percents：0.12%, Si：0.53%, Mn： 1.56%, P：0.012%, S：0.003%, Ni：0.60%, surplus is Fe and inevitable impurity.Steelmaking alloy deoxidation Afterwards, LF refining 20 minutes, RH vacuum refinings deaerate 25 minutes, and nitrogen content of molten steel is made to be not higher than 38ppm, and hydrogen content is not higher than 1.5ppm, oxygen content are not higher than 20ppm；Sheet billet continuous casting, pulling rate 1.1m/min；Reheating 3.5h makes strand central temperature reach 1130 DEG C, 1100 DEG C of start rolling temperature, two sections of 910 DEG C of rollings, 820 DEG C of finishing temperature, reduction ratio 61%；Steel plate red temperature 650 ℃；Align 6mm/m；880 DEG C of hardening heat, 620 DEG C of temperature.Mechanical property yield strength 539MPa, tensile strength 642MPa, elongation percentage 22%, -40 DEG C of ballistic work 191J, 195J, 193J (10*10mm).
Embodiment nine, 8mm specification Q500E include the ingredient C of following mass percents：0.16%, Si：0.13%, Mn： 0.90%, P：0.011%, S：0.001%, Mo：0.45%, Al：0.05%, surplus is Fe and inevitable impurity.Steel-making After alloying deoxidation, LF refining 26 minutes, RH vacuum refinings deaerate 28 minutes, and nitrogen content of molten steel is made to be not higher than 38ppm, hydrogen content Not higher than 1.5ppm, oxygen content is not higher than 20ppm；Sheet billet continuous casting, pulling rate 1.0m/min；Reheating 4.3h makes strand central temperature Reach 1210 DEG C, 1180 DEG C of start rolling temperature, two sections roll 940 DEG C, 900 DEG C of finishing temperature, reduction ratio 89%；Steel plate red temperature 690℃；Align 3mm/m；910 DEG C of hardening heat, 640 DEG C of temperature.Mechanical property yield strength 556MPa, tensile strength 662MPa, elongation percentage 20%, -40 DEG C of ballistic work 58J, 47J, 48J (5*10mm).
Embodiment ten, 30mm specification Q500E include the ingredient C of following mass percents：0.12%, Si：0.17%, Mn： 1.21%, P：0.010%, S：0.003%, Cu：0.40%, Al：0.010%, surplus is Fe and inevitable impurity.Steel-making After alloying deoxidation, LF refining 21 minutes, RH vacuum refinings deaerate 25 minutes, and nitrogen content of molten steel is made to be not higher than 38ppm, hydrogen content Not higher than 1.5ppm, oxygen content is not higher than 20ppm；Sheet billet continuous casting, pulling rate 0.85m/min；Reheating 4.0h makes strand center temperature Degree reaches 1150 DEG C, 1130 DEG C of start rolling temperature, and two sections roll 900 DEG C, 820 DEG C of finishing temperature, reduction ratio 61%；Steel plate returns red temperature 650 DEG C of degree；Align 3mm/m；920 DEG C of hardening heat, 620 DEG C of temperature.Mechanical property yield strength 546MPa, tensile strength 655MPa, elongation percentage 21%, -40 DEG C of ballistic work 217J, 219J, 221J (10*10mm).
Embodiment 11,20mm specification Q500E steel plates, includes the ingredient C of following mass percents：0.23%, Si： 0.46%, Mn：0.95%, P：0.016%, S：0.009%, Nb：0.06%, surplus is Fe and inevitable impurity.Steel-making After alloying deoxidation, LF refining 30 minutes, RH vacuum refinings deaerate 30 minutes, and nitrogen content of molten steel is made to be not higher than 38ppm, hydrogen content Not higher than 1.5ppm, oxygen content is not higher than 20ppm；Sheet billet continuous casting, pulling rate 0.9m/min；Reheating 3.9h makes strand central temperature Reach 1200 DEG C, 1180 DEG C of start rolling temperature, two sections roll 950 DEG C, 900 DEG C of finishing temperature, reduction ratio 66%；Steel plate red temperature 680℃；Align 3mm/m；920 DEG C of hardening heat, 600 DEG C of temperature.Mechanical property yield strength 545MPa, tensile strength 636MPa, elongation percentage 21%, -40 DEG C of ballistic work 188J, 193J, 199J (10*10mm).
Embodiment 12,10mm specification Q500E steel plates, includes the ingredient C of following mass percents：0.17%, Si： 0.10%, Mn：1.10%, P：0.013%, S：0.003%, Ti：0.12%, B：0.0030%, surplus is for Fe and unavoidably Impurity.After steelmaking alloy deoxidation, LF refining 25 minutes, RH vacuum refinings deaerate 25 minutes, and nitrogen content of molten steel is made to be not higher than 38ppm, hydrogen content are not higher than 1.5ppm, and oxygen content is not higher than 20ppm；Sheet billet continuous casting, pulling rate 0.95m/min；Reheat 4.2h Strand central temperature is set to reach 1210 DEG C, 1170 DEG C of start rolling temperature, two sections roll 940 DEG C, 890 DEG C of finishing temperature, reduction ratio 64%；690 DEG C of steel plate red temperature；Align 4mm/m；910 DEG C of hardening heat, 550 DEG C of temperature.Mechanical property yield strength 551MPa, tensile strength 643MPa, elongation percentage 20%, -40 DEG C of ballistic work 57J, 58J, 63J (5*10mm).
Pass through above-described embodiment, it is known that 500MPa grade steel for engineering machinery of the invention have preferable mechanical property and Fatigue behaviour can improve the service life of engineering machinery, and also meet the subzero 40 DEG C of low-temperature flexibility demands of engineering machinery. The Q235B common materials that perfect can be substituted yield strength on steel for engineering machinery and only have 235MPa, push metallurgical and engineering Machinery industry product quality upgrades.
The above is only a preferred embodiment of the present invention, it should be pointed out that in the premise for the design for not departing from the present invention Under, several deductions or replacement can also be made, these, which are deduced or substitute, is regarded as protection scope of the present invention.

Claims (6)

1. a kind of 500MPa grades of steel for engineering machinery, which is characterized in that include the ingredient of following mass percent：C：0.12~ 0.23%,
Si：0.10~0.60%,
Mn：0.80~1.90%,
P：＜ 0.018%,
S：＜ 0.010%；
And it is selected from Cr：0~0.50%, Ni：0~0.60%, Mo：0~0.45%, Cu：0~0.40%, Nb：0~ 0.060%, V：0~0.15%, Ti：0~0.12%, B：0~0.0030%, A1：One kind or more in 0.010~0.050% Kind；
Surplus is Fe and inevitable impurity.
2. 500MPa grades of steel for engineering machinery according to claim 1, which is characterized in that metallographic structure is uniformly tiny Martensite high tempering tissue.
3. a kind of manufacturing method of 500MPa grade steel for engineering machinery as described in claim 1~2 is any, which is characterized in that Steps are as follows includes：
(1) smelting molten steel：Preparation meets into the molten steel being grouped as；
(2) it is cast into base：Molten steel is sent into conticaster whole process argon for protecting pouring, while electromagnetic agitation, 0.75~1.2m/ of pulling rate Min obtains strand；
(3) heating strand：Strand is evenly heated 3.5~4.5 hours at 1100~1220 DEG C；
(4) it rolls：Using four roll reversing roller two-phase control rollings, roughing rolls reduction ratio and is more than 60%, roughing start rolling temperature 1070~1180 DEG C, 890~950 DEG C of two-stage start rolling temperature, 820~900 DEG C of finishing temperature obtains steel plate；
(5) control cooling：After accelerating outlet steel plate residual water purging in cold-zone clean, anti-red 650~690 DEG C of the temperature of steel plate is measured；
(6) it aligns：Steel plate is aligned, 3~6mm/m of control aligning unevenness；
(7) bead：Remove surface of steel plate iron scale；
(8) to remove iron scale steel plate be heat-treated to get.
4. the manufacturing method of 500MPa grades of steel for engineering machinery according to claim 3, which is characterized in that the step (1) prepared composition forms satisfactory molten steel in, includes the following steps：
(1.1) molten iron pre-processes, and makes the S in molten iron：＜ 0.010%；
(1.2) converter is added in pretreated molten iron, deoxidation alloying is smelted and carried out using BOF methods, the alloy of addition is It designs alloy in molten steel composition and matches the 90% of dosage；
(1.3) LF stoves refine 15~30min, and fine tuning alloying component makes alloying component meet the requirements, and promotes liquid steel temperature；
(1.4) RH Fruit storages 15-30 minutes, RH BOTTOM ARGON BLOWINGs rationally stir and the removal non-metallic inclusion that floats, and reduce Nitrogen hydrogen-oxygen content；
(1.5) feeding calcium line purify molten steel, make strip MnS non-metallic inclusions become dispersion, shorten spheroidization to get.
5. the manufacturing method of 500MPa grades of steel for engineering machinery according to claim 3, which is characterized in that the step (8) heat treatment is that steel plate is first heated to 880~920 DEG C using nitrogen protection non-oxidation roller hearth furnace in；Then to steel plate into Row roller press type water knife quenches；High tempering processing is carried out at 550~660 DEG C again.
6. the manufacturing method of 500MPa grades of steel for engineering machinery according to claim 4, which is characterized in that the step (1.4) nitrogen content≤38ppm of control molten steel, hydrogen content≤1.5ppm, oxygen content≤20ppm in.
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