CN109023118A - A kind of high-performance R4 mooring chain steel and preparation method thereof - Google Patents
A kind of high-performance R4 mooring chain steel and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of high-performance R4 mooring chain steel and preparation method thereof, main component and corresponding mass percentage are as follows: C0.12 ~ 0.24, Mn0.10 ~ 0.55, Si0.15 ~ 0.35, Cr0.60 ~ 3.50, Mo0.35 ~ 0.75, N≤0.006, Ni0.40 ~ 4.50, Cu≤0.50, S≤0.005, P0.005 ~ 0.025, O≤0.0015, H≤0.00015, surplus are Fe and inevitable impurity.Preparation method is included the following steps: 1) to match according to above-mentioned tapping target component, is just refined using electric furnace or converter, through external refining, steel ingot or continuous casting billet are poured into after vacuum outgas；The ratio between ingot, the sectional area of base and finished product round steel sectional area are greater than 7；2) after continuous casting billet or ingot steel casting hot sending processing or slow cooling be transferred to hot procedure or 200~700 DEG C of heat preservations it is air-cooled after transfer to hot procedure；3) continuous casting billet or Heating Steel Ingots, heating furnace initial temperature≤900 DEG C, heating rate≤150 DEG C/h, until keeping the temperature 40 minutes or more after 1100~1300 DEG C；4) round steel is after grinding wheel grinds stripping and checks, without the surface defect for being deeper than 0.20mm.
Description
Technical field
The invention belongs to low-alloy steel fields, and in particular to a kind of high-performance R4 mooring chain steel and preparation method thereof.
Background technique
Mooring chain steel can be divided into three-level (R3), level Four (R4), Pyatyi (R5) by its intensity rank.Its chain link is integrally quenched
Intensity rank afterwards is respectively 690Mpa, 860Mpa, 1000Mpa.And need to have high plasticity, toughness and yield tensile ratio≤
0.92 security requirement.The mooring chain steel for the highest level that the classification societies are approved at present is R5 grades.
In recent years, deeply developing with marine resources, in the world, the purposes such as deep-sea oil recovery, seafari
Marine facility increases, and the demand to 60~160mm major diameter mooring cable of mooring these facilities also increasingly increases.Although ocean
Facility tends to enlargement, high strengthening, however due to the limitation of its Weight Loaded, anchor chain diameter can not arbitrarily expand.
However, be only used only improve chain steel strength character it is horizontal, not only be difficult to obtain such as crack sensitivity, low comprehensively
It is heat-treated sensibility, low-quality graded effect, high-strength tenacity, low yield strength ratio and base material/basic work such as weld strength difference and welding seam toughness
Skill performance and mechanical property, it is more difficult to when the technology barrier gone beyond is that intensity is big, steel mooring cable in marine environment be easy because
The invasion of micro environment hydrogen and environment sensitive crackle occurs.
Use number of patent application 201010516347.3, " steel used for sea oil extraction platform R 4 S grade mooring chain and its manufacture "
Control Mn (really 87mm) round steel chain of trial production, chain link of the specification introduction through -580 DEG C of water coolings of 960 DEG C of water coolings,
Matrix tensile strength is 1025MPa, and same chain girth joint performance is only 911MPa, i.e. the tensile strength difference of chain link and weld seam
More than 110MPa, the chain link through -590 DEG C of water coolings of 960 DEG C of water coolings, tempering temperature only improves 10 DEG C than 580 DEG C, and tensile strength is anxious
85MPa, only 940MPa drop, and yield tensile ratio does not meet the performance standard of R4S grades of chains but instead more than 0.92, and stipulated that returning
Fiery temperature is 570~590 DEG C, and temperature range is extremely narrow, and heat treatment sensibility is but very high, and Weld Performance is low, it is difficult to for industry rule
Molding makes high-intensitive chain.
Summary of the invention
To solve the deficiencies in the prior art, the purpose of the present invention is to provide a kind of big specification of high-performance (φ: 60~
R4 mooring chain steel 160mm) and preparation method thereof.
To achieve the above object, the technical solution adopted in the present invention is as follows:
A kind of high-performance R4 mooring chain steel, ingredient percent are as follows: C:0.24~0.28%, Mn0.70~
1.55%, Si:0.25~0.38%, Cr:1.60~2.50%, Mo:0.23~0.75%, N≤0.006%, Ni:0.40~
1.50%, Cu≤0.150%, S≤0.005%, P:0.005~0.025%, O≤0.0035%, H≤0.0005%, surplus are
Fe and inevitable impurity.
As the optimal technical scheme of application, the hardening heat of the high-performance marine mooring chain steel is 900-980 DEG C, is returned
Fiery temperature is 600~650 DEG C.
It further include one or more kinds of microalloyings member of V, Al, Nb, Ti, Ca as the optimal technical scheme of application
Element, content are V:0.05~0.25%, Al:0.05~0.1%, Nb:0.005~0.02%, Ti:0.05~0.20%, Ca:
0.005~0.04%, Sn+Sb+As≤0.035%, by percentage to the quality.
The preparation method of above-mentioned high-performance R4 mooring chain steel, includes the following steps:
1) it is matched according to above-mentioned tapping target component, is just refined using electric furnace or converter, through external refining, poured after vacuum outgas
Form steel ingot or continuous casting billet；The ratio between ingot, the sectional area of base and finished product round steel sectional area are greater than 7；
2) hot sending processing or slow cooling are transferred to hot procedure or 200~700 DEG C of heat preservations skies after continuous casting billet or ingot steel casting
Hot procedure is transferred to after cold；
3) continuous casting billet or Heating Steel Ingots, heating furnace initial temperature≤900 DEG C, heating rate≤150 DEG C/h, until 1100~
40 minutes or more are kept the temperature after 1300 DEG C；
4) round steel is after grinding wheel grinds stripping and checks, without the surface defect for being deeper than 0.20mm.
As the optimal technical scheme of application, the step (3) any one can be processed into directly according to following 3 kinds of methods
The round steel of 60~160mm of diameter:
A. through blooming mill cogging, slow cooling；Billet surface is in cooling velocity≤180 DEG C of 800~500 DEG C of temperature ranges/h；
If billet surface is in cooling velocity > 180 DEG C of 800~500 DEG C of temperature ranges/h after breaking down cogging, steel billet is within 24 hours
Heating rolling finished product round steel, otherwise >=600 DEG C stress-removal processing；Bloom after breaking down cogging is heated at 1150~1200 DEG C
It is rolled into the round steel of 60~160mm of diameter afterwards, rear slow cooling or >=600 DEG C of softening heat treatments are rolled in finishing temperature≤1050 DEG C；
B. the round steel for being rolled into 60~160mm of diameter is directly heat-fed after breaking down cogging, finishing temperature≤1050 DEG C are delayed after rolling
Cold or >=600 DEG C of softening heat treatments；
C. continuous casting billet or steel ingot are forged into the round steel of 60~160mm of diameter, finishing temperature≤1050 DEG C, subsequent slow cooling or
>=600 DEG C of softening heat treatments.
As the optimal technical scheme of application, raw metal used in refining process at the beginning of the electric furnace or converter be molten iron,
One of the pig iron, steel scrap, ferroalloy, sponge iron, metal oxide, ore or any two or more mixing.
Beneficial effects of the present invention:
(1) it chemical component proportion of the present invention: compresses the content range of C, reduce Mn content as far as possible, selectively add P, Cu
And on the one hand REM, chemical component economy ensure that the ultra-high strength and toughness of mooring cable of the present invention；On the other hand control bainite/
The ratio of martensitic structure, guarantee meet yield tensile ratio requirement, also improve chain finished product corrosion resistance and highly resistance EAC ability.
(2) method of refinement crystal grain is available there are many present invention, and crystal grain refinement is to improve comprehensive performance and reduce EAC
The basic guarantee of sensibility.
(3) it ensure that and meet the enough section compression ratios of steel ingot (continuous casting billet)/finished steel, and be aided with reasonable thermal technology's ginseng
Number improves compactness and uniformity inside steel, guarantees the performance level of finished steel.
(4) steel product ingredient of the present invention implements quenching-and-tempering process after being suitable for chain processed in existing weaponry and equipment, further mentions
High tempering temperature is one of main feature of the invention, with stability and can reduce EAC sensibility, guarantee that mooring cable finally obtains
Obtain stable and excellent comprehensive performance.
Specific embodiment
The present invention is described in further details with reference to embodiments.Production is not specified in agents useful for same or instrument and equipment
Manufacturer, it is accordingly to be regarded as the conventional products that can be bought by market.
Embodiment 1
A kind of high-performance R4 mooring chain steel, ingredient percent are as follows: C:0.24%, Mn0.70%, Si:0.25%,
Cr:1.60%, Mo:0.23%, N:0.005%, Ni:0.40%, Cu:0.150%, S:0.001%, P:0.005%, O:
0.0015%, H:0.0001%, V:0.05%, Al:0.05%, Nb:0.005%, Ti:0.05%, Ca:0.005%, surplus are
Fe and inevitable impurity.
The preparation method of above-mentioned high-performance R4 mooring chain steel, includes the following steps:
1) it is matched according to above-mentioned tapping target component, is just refined using electric furnace or converter, through external refining, poured after vacuum outgas
Form steel ingot or continuous casting billet；The ratio between ingot, the sectional area of base and finished product round steel sectional area are greater than 7；
2) hot sending processing or slow cooling are transferred to hot procedure or 200~700 DEG C of heat preservations skies after continuous casting billet or ingot steel casting
Hot procedure is transferred to after cold；
3) continuous casting billet or Heating Steel Ingots, heating furnace initial temperature≤900 DEG C, heating rate≤150 DEG C/h, until 1100~
40 minutes or more are kept the temperature after 1300 DEG C；
4) round steel is after grinding wheel grinds stripping and checks, without the surface defect for being deeper than 0.20mm.
The step (3) any one can be processed into the round steel of diameter 60mm according to following 3 kinds of methods:
A. through blooming mill cogging, slow cooling；Billet surface is in cooling velocity≤180 DEG C of 800~500 DEG C of temperature ranges/h；
If billet surface is in cooling velocity > 180 DEG C of 800~500 DEG C of temperature ranges/h after breaking down cogging, steel billet is within 24 hours
Heating rolling finished product round steel, otherwise >=600 DEG C stress-removal processing；Bloom after breaking down cogging is heated at 1150~1200 DEG C
It is rolled into the round steel of diameter 60mm afterwards, rear slow cooling or >=600 DEG C of softening heat treatments are rolled in finishing temperature≤1050 DEG C；
B. directly hot sending is rolled into the round steel of diameter 60mm after breaking down cogging, finishing temperature≤1050 DEG C, roll rear slow cooling or
>=600 DEG C of softening heat treatments；
C. continuous casting billet or steel ingot are forged into the round steel of diameter 60mm, finishing temperature≤1050 DEG C, subsequent slow cooling or >=600
DEG C softening heat treatment.
Embodiment 2
A kind of high-performance R4 mooring chain steel, ingredient percent are as follows: C:0.26%, Mn1.0%, Si:0.30%,
Cr:2.0%, Mo:0.50%, N:0.003%, Ni:1.0%, Cu:0.10%, S:0.005%, P:0.015%, O:0.0:
05%, H≤0.0002%, V:0.05~0.25%, Al:0.08%, Nb:0.01%, Ti:0.10%, Ca:0.02%, surplus
For Fe and inevitable impurity.
The preparation method of above-mentioned high-performance R4 mooring chain steel, includes the following steps:
1) it is matched according to above-mentioned tapping target component, is just refined using electric furnace or converter, through external refining, poured after vacuum outgas
Form steel ingot or continuous casting billet；The ratio between ingot, the sectional area of base and finished product round steel sectional area are greater than 7；
2) hot sending processing or slow cooling are transferred to hot procedure or 200~700 DEG C of heat preservations skies after continuous casting billet or ingot steel casting
Hot procedure is transferred to after cold；
3) continuous casting billet or Heating Steel Ingots, heating furnace initial temperature≤900 DEG C, heating rate≤150 DEG C/h, until 1100~
40 minutes or more are kept the temperature after 1300 DEG C；
4) round steel is after grinding wheel grinds stripping and checks, without the surface defect for being deeper than 0.20mm.
The step (3) any one can be processed into the round steel of diameter 120mm according to following 3 kinds of methods:
A. through blooming mill cogging, slow cooling；Billet surface is in cooling velocity≤180 DEG C of 800~500 DEG C of temperature ranges/h；
If billet surface is in cooling velocity > 180 DEG C of 800~500 DEG C of temperature ranges/h after breaking down cogging, steel billet is within 24 hours
Heating rolling finished product round steel, otherwise >=600 DEG C stress-removal processing；Bloom after breaking down cogging is heated at 1150~1200 DEG C
It is rolled into the round steel of diameter 120mm afterwards, rear slow cooling or >=600 DEG C of softening heat treatments are rolled in finishing temperature≤1050 DEG C；
B. directly hot sending is rolled into the round steel of diameter 120mm after breaking down cogging, finishing temperature≤1050 DEG C, roll rear slow cooling or
>=600 DEG C of softening heat treatments；
C. continuous casting billet or steel ingot are forged into the round steel of diameter 120mm, finishing temperature≤1050 DEG C, subsequent slow cooling or >=
600 DEG C of softening heat treatments.
Embodiment 3
A kind of high-performance R4 mooring chain steel, ingredient percent are as follows: C:0.28%, Mn1.55%, Si:0.38%,
Cr:2.50%, Mo:0.75%, N:0.001%, Ni:1.50%, Cu:0.150%, S:0.005%, P:0.025%, O:
0.0035%, H:0.0001%, V:0.25%, Al:0.1%, Nb:0.02%, Ti:0.20%, Ca:0.04%, Sn+Sb+As
≤ 0.035%, surplus is Fe and inevitable impurity.
The preparation method of above-mentioned high-performance R4 mooring chain steel, includes the following steps:
1) it is matched according to above-mentioned tapping target component, is just refined using electric furnace or converter, through external refining, poured after vacuum outgas
Form steel ingot or continuous casting billet；The ratio between ingot, the sectional area of base and finished product round steel sectional area are greater than 7；
2) hot sending processing or slow cooling are transferred to hot procedure or 200~700 DEG C of heat preservations skies after continuous casting billet or ingot steel casting
Hot procedure is transferred to after cold；
3) continuous casting billet or Heating Steel Ingots, heating furnace initial temperature≤900 DEG C, heating rate≤150 DEG C/h, until 1100~
40 minutes or more are kept the temperature after 1300 DEG C；
4) round steel is after grinding wheel grinds stripping and checks, without the surface defect for being deeper than 0.20mm.
The step (3) any one can be processed into the round steel of diameter 160mm according to following 3 kinds of methods:
A. through blooming mill cogging, slow cooling；Billet surface is in cooling velocity≤180 DEG C of 800~500 DEG C of temperature ranges/h；
If billet surface is in cooling velocity > 180 DEG C of 800~500 DEG C of temperature ranges/h after breaking down cogging, steel billet is within 24 hours
Heating rolling finished product round steel, otherwise >=600 DEG C stress-removal processing；Bloom after breaking down cogging is heated at 1150~1200 DEG C
It is rolled into the round steel of diameter 160mm afterwards, rear slow cooling or >=600 DEG C of softening heat treatments are rolled in finishing temperature≤1050 DEG C；
B. directly hot sending is rolled into the round steel of diameter 160mm after breaking down cogging, finishing temperature≤1050 DEG C, roll rear slow cooling or
>=600 DEG C of softening heat treatments；
C. continuous casting billet or steel ingot are forged into the round steel of diameter 160mm, finishing temperature≤1050 DEG C, subsequent slow cooling or >=
600 DEG C of softening heat treatments.
Performance test:
900 DEG C of the sample quenchings to 3 embodiments, sample after 600 DEG C of tempering, carry out Mechanics Performance Testing, inspection result
As shown in table 1.
| Project | Diameter/mm | ReL/MPa | Rm/MPa | δ5/ % | ψ/% |
| 1-1 | 60 | 735 | 889 | 20.8 | 60 |
| 1-2 | 60 | 743 | 892 | 20.3 | 63 |
| 1-3 | 60 | 729 | 885 | 20.5 | 64 |
| 2-1 | 120 | 750 | 905 | 24.2 | 70 |
| 2-2 | 120 | 746 | 910 | 24.1 | 71 |
| 2-3 | 120 | 751 | 908 | 24.7 | 73 |
| 3-1 | 160 | 778 | 930 | 27.3 | 79 |
| 3-2 | 160 | 770 | 931 | 27.8 | 80 |
| 3-3 | 160 | 775 | 934 | 27.3 | 82 |
Protection content of the invention is not limited to above embodiments.Without departing from the spirit and scope of the invention, originally
Field technical staff it is conceivable that variation and advantage be all included in the present invention, and with the attached claims be protection
Range.
Claims (6)
1. a kind of high-performance R4 mooring chain steel, which is characterized in that its ingredient percent are as follows: C:0.24 ~ 0.28%, Mn0.70
~1.55%, Si:0.25~0.38%, Cr:1.60~2.50%, Mo:0.23~0.75%, N≤0.006%, Ni:0.40~
1.50%, Cu≤0.150%, S≤0.005%, P:0.005~0.025%, O≤0.0035%, H≤0.0005%, surplus be Fe and
Inevitable impurity.
2. high-performance R4 mooring chain steel as described in claim 1, which is characterized in that the high-performance marine mooring chain steel is quenched
Fiery temperature is 900-980 DEG C, and tempering temperature is 600~650 DEG C.
3. high-performance R4 mooring chain steel as described in claim 1, which is characterized in that further include one kind of V, Al, Nb, Ti, Ca
Or more than one micro alloying elements, content be V:0.05~0.25%, Al:0.05~0.1%, Nb:0.005~0.02%,
Ti:0.05~0.20%, Ca:0.005~0.04%, Sn+Sb+As≤0.035%, by percentage to the quality.
4. the preparation method of high-performance R4 mooring chain steel as described in claim 1, which comprises the steps of:
1) it is matched according to above-mentioned tapping target component, is just refined using electric furnace or converter, through external refining, be poured after vacuum outgas
At steel ingot or continuous casting billet；The ratio between ingot, the sectional area of base and finished product round steel sectional area are greater than 7；
2) after continuous casting billet or ingot steel casting hot sending processing or slow cooling be transferred to hot procedure or 200~700 DEG C of heat preservations it is air-cooled after
Transfer to hot procedure；
3) continuous casting billet or Heating Steel Ingots, heating furnace initial temperature≤900 DEG C, heating rate≤150 DEG C/h, until 1100~1300 DEG C
Keep the temperature 40 minutes afterwards or more；
4) round steel is after grinding wheel grinds stripping and checks, without the surface defect for being deeper than 0.20mm.
5. the preparation method of high-performance R4 mooring chain steel as claimed in claim 4, which is characterized in that the step (3) can be with
According to following 3 kinds of methods, any one is processed into the round steel of 60~160mm of diameter:
A. through blooming mill cogging, slow cooling；Billet surface is in cooling velocity≤180 DEG C of 800~500 DEG C of temperature ranges/h；If
In cooling velocity > 180 DEG C of 800~500 DEG C of temperature ranges/h, steel billet adds billet surface within 24 hours after breaking down cogging
Hot rolling manufactured goods round steel, otherwise >=600 DEG C stress-removal processing；Bloom after breaking down cogging is after 1150~1200 DEG C of heating
It is rolled into the round steel of 60~160mm of diameter, rear slow cooling or >=600 DEG C of softening heat treatments are rolled in finishing temperature≤1050 DEG C；
B. directly hot sending is rolled into the round steel of 60~160mm of diameter after breaking down cogging, finishing temperature≤1050 DEG C, roll rear slow cooling or
>=600 DEG C of softening heat treatments；
C. continuous casting billet or steel ingot are forged into the round steel of 60~160mm of diameter, finishing temperature≤1050 DEG C, subsequent slow cooling or >=
600 DEG C of softening heat treatments.
6. the preparation method of high-performance R4 mooring chain steel as claimed in claim 4, which is characterized in that at the beginning of the electric furnace or converter
Raw metal used in refining process is one of molten iron, the pig iron, steel scrap, ferroalloy, sponge iron, metal oxide, ore
Or any two or more mixing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811162238.9A CN109023118A (en) | 2018-09-30 | 2018-09-30 | A kind of high-performance R4 mooring chain steel and preparation method thereof |
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| CN201811162238.9A CN109023118A (en) | 2018-09-30 | 2018-09-30 | A kind of high-performance R4 mooring chain steel and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116287996A (en) * | 2023-03-03 | 2023-06-23 | 江阴兴澄特种钢铁有限公司 | A kind of heat-free mooring chain steel and its manufacturing method |
| WO2023160613A1 (en) * | 2022-02-23 | 2023-08-31 | 上海茵矩材料科技有限公司 | Mooring chain steel and production method therefor, and mooring chain and production method therefor |
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Cited By (2)
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| WO2023160613A1 (en) * | 2022-02-23 | 2023-08-31 | 上海茵矩材料科技有限公司 | Mooring chain steel and production method therefor, and mooring chain and production method therefor |
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