CN103614647A - Rare earth alloy steel material used for valves and preparation method of the material - Google Patents
Rare earth alloy steel material used for valves and preparation method of the material Download PDFInfo
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- CN103614647A CN103614647A CN201310506253.1A CN201310506253A CN103614647A CN 103614647 A CN103614647 A CN 103614647A CN 201310506253 A CN201310506253 A CN 201310506253A CN 103614647 A CN103614647 A CN 103614647A
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Abstract
The invention discloses a rare earth alloy steel material used for valves. The rare earth alloy steel material comprises following chemical elements by weight: 0.2-0.4% of carbon, 0.3-0.45% of silicon, 3.2-3.4% of manganese, 0.9-1.2% of chromium, 0.5-0.7% of molybdenum, 0.1-0.25% of vanadium, 0.02-0.04% of lanthanum, 0.02-0.04% of cerium, 0.12-0.24% of copper, 0.04-0.07% of Tm, S not more than 0.04% and P not more than 0.04%, with the balance being iron. An alloy produced has characteristics of high strength, compact resistance, wear resistance and high hot strength by utilization of the molybdenum, the vanadium, the vanadium, the rare earth elements, etc., and by adding the raw materials in batches and reasonably controlling the thermal treatment temperature after casting. The rare earth alloy steel material is suitable for valves, pipes and impellers of pumps operated at high temperature. A refining agent provided by the invention is used for casting production and is capable of increasing the rate of finished products. In particular, the porosity degree in castings is reduced by 1-2 degrees and oxide inclusion is at about the 2 level.
Description
Technical field
The present invention relates to metallic substance preparation field, relate in particular to rare earth alloy steel and preparation method thereof for a kind of valve.
Background technology
The environment of pump valve work is various, badly, very high to the requirement of material, the steel alloy that pump valve is used at present has varied, technology has very much progress, but still have a lot of problems to exist, as wear resistance, hardness, rustless property, corrosion resistance nature, high and low temperature resistance, fragility, toughness etc., in a lot of occasions, can't meet the requirement of production, also require further improvement, to enhance productivity, reduce costs, improve security, for high-quality precision and sophisticated technology development provides safeguard, for social development provides power, task is also very arduous.
Summary of the invention
The object of the present invention is to provide rare earth alloy steel and preparation method thereof for a kind of valve, this alloy material has advantages of high strength, wear-resisting, heat is strong high.
Technical scheme of the present invention is as follows:
A valve rare earth alloy steel, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.2-0.4, silicon 0.3-0.45, manganese 3.2-3.4, chromium 0.9-1.2, molybdenum 0.5-0.7, vanadium 0.1-0.25, lanthanum 0.02-0.04, cerium 0.02-0.04, copper 0.12-0.24, Tm0.04-0.07, S≤0.04, P≤0.04, surplus are iron.
The production method of rare earth alloy steel for described valve, is characterized in that:
(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:0.5-1 ratio, the pig iron is added to drop in stove and melt, carry out desulfurization, deoxidation, employing refining agent initial refining, add alloying constituent and carry out alloying, then add scrap iron fusing, add refining agent secondary refining, detection and adjust chemical element component content to qualified, casting, casting postheat treatment etc.;
(2) in alloying process, to the lot sequence that drops into alloying element in stove, be: (1) silicon, manganese, cerium; (2) chromium, molybdenum, lanthanum; (3) other remaining components; The timed interval that each batch drops into element is 22-25 minute, after feeding intake, stirs.
Described casting postheat treatment is: first by room temperature, with 190-200 ℃/h of speed, be warming up to 500-510 ℃, with 150-160 ℃/h of speed, be cooled to 400-410 ℃ again, with 190-200 ℃/h of speed, be warming up to 650-660 ℃ again, insulation 60-70 minute, with 200-220 ℃/h of speed, be warming up to 920-935 ℃ again, insulation 3-4 hour; With 160-170 ℃/h of speed, be cooled to 600-610 ℃ again, then be warming up to 720-730 ℃ with 190-200 ℃/h of speed, then be cooled to 500-510 ℃ with 150-160 ℃/h of speed, insulation 60-80 minute; With 150-160 ℃/h of speed, be cooled to 200-210 ℃ again, insulation 2-3 hour; With 190-200 ℃/h of speed, be warming up to 300-310 ℃ again, insulation 40-60 minute, then be warming up to 540-550 ℃ with 190-200 ℃/h of speed, insulation 2-3 hour, takes out air cooling and get final product.
Described refining agent is made by the raw material of following weight part: instrument comminuted steel shot 3-4, zinc oxide 1-2, aluminium powder 1-2, SODIUMNITRATE 3-5, ground dolomite 3-4, kaolin 2-3, Zirconium tetrafluoride 1-2, jade powder 3-4, montmorillonite 1-2, Sodium Silicofluoride 2-3; Preparation method mixes each raw material, is heated to molten state, then, is poured into Quench in pure water, then is ground into 100-200 order powder; Gained powder is added and is equivalent to the silane resin acceptor kh-550 of powder weight 2-3%, the nano-carbon powder of 1-2%, after mixing, under 8-15Mpa, be pressed into base, then, at 900-950 ℃, calcine 3-4 hour, cooling after, be ground into again 150-250 order powder, obtain.
Beneficial effect of the present invention
The present invention is by using the elements such as molybdenum, vanadium, vanadium and rare earth element, and gradation throwing raw materials, rationally controls casting postheat treatment temperature in addition, and the alloy of formation has high strength, shock-resistant, wear-resisting, the strong high feature of heat; Use part scrap iron as raw material, and through secondary refining, make more stable uniform of quality.Steel alloy of the present invention is applicable to valve, pipeline, the impeller of high-temperature service pump.Refining agent of the present invention is for Foundry Production, and the degree of porosity obviously improving in yield rate, particularly foundry goods reduces 1-2 degree, can not produce pore at cast(ing) surface, and trapped oxide also obviously reduces, and oxide inclusion is 2 grades of left and right.
Embodiment
A valve rare earth alloy steel, chemical element composition and mass percent thereof that it contains are: carbon 0.2-0.4, silicon 0.3-0.45, manganese 3.2-3.4, chromium 0.9-1.2, molybdenum 0.5-0.7, vanadium 0.1-0.25, lanthanum 0.02-0.04, cerium 0.02-0.04, copper 0.12-0.24, Tm0.04-0.07, S≤0.04, P≤0.04, surplus are iron.
Described valve by the production method of rare earth alloy steel is:
(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:0.7 ratio, the pig iron is added to drop in stove and melt, carry out desulfurization, deoxidation, employing refining agent initial refining, add alloying constituent and carry out alloying, then add scrap iron fusing, add refining agent secondary refining, detection and adjust chemical element component content to qualified, casting, casting postheat treatment etc.;
(2) in alloying process, to the lot sequence that drops into alloying element in stove, be: (1) silicon, manganese, cerium; (2) chromium, molybdenum, lanthanum; (3) other remaining components; The timed interval that each batch drops into element is 23 minutes, after feeding intake, stirs.
Described casting postheat treatment is: first by room temperature, with 195 ℃/h of speed, be warming up to 505 ℃, with 155 ℃/h of speed, be cooled to 405 ℃ again, then be warming up to 655 ℃ with 195 ℃/h of speed, be incubated 65 minutes, with 210 ℃/h of speed, be warming up to 926 ℃ again, be incubated 3.5 hours; With 165 ℃/h of speed, be cooled to 605 ℃ again, then be warming up to 725 ℃ with 195 ℃/h of speed, then be cooled to 505 ℃ with 155 ℃/h of speed, be incubated 70 minutes; With 155 ℃/h of speed, be cooled to 205 ℃ again, be incubated 2.5 hours; With 195 ℃/h of speed, be warming up to 305 ℃ again, be incubated 50 minutes, then be warming up to 545 ℃ with 195 ℃/h of speed, be incubated 2.5 hours, take out air cooling and get final product.
Described refining agent by following weight part (kilogram) raw material make: instrument comminuted steel shot 3.5, zinc oxide 1.5, aluminium powder 1.5, SODIUMNITRATE 4, ground dolomite 3.5, kaolin 2.5 Zirconium tetrafluorides 1.5, jade powder 3.5, montmorillonite 1.5, Sodium Silicofluoride 2.5; Preparation method mixes each raw material, is heated to molten state, then, is poured into Quench in pure water, then is ground into 150 order powder; Gained powder is added and is equivalent to the silane resin acceptor kh-550 of powder weight 2.5%, 1.5% nano-carbon powder, after mixing, under 11Mpa, be pressed into base, then, at 930 ℃, calcine 3.5 hours, cooling after, then be ground into 200 order powder, obtain.
Valve of the present invention by the mechanical property of rare earth alloy steel is: tensile strength 1235MPa, yield strength 934MPa, unit elongation 15.5%, relative reduction in area 24.4%, impact absorbing energy 52.3J, impelling strength 63.4J/cm2, hardness 259.4HB.
Claims (4)
1. a valve rare earth alloy steel, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.2-0.4, silicon 0.3-0.45, manganese 3.2-3.4, chromium 0.9-1.2, molybdenum 0.5-0.7, vanadium 0.1-0.25, lanthanum 0.02-0.04, cerium 0.02-0.04, copper 0.12-0.24, Tm0.04-0.07, S≤0.04, P≤0.04, surplus are iron.
2. the production method of rare earth alloy steel for valve according to claim 1, is characterized in that:
(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:0.5-1 ratio, the pig iron is added to drop in stove and melt, carry out desulfurization, deoxidation, employing refining agent initial refining, add alloying constituent and carry out alloying, then add scrap iron fusing, add refining agent secondary refining, detection and adjust chemical element component content to qualified, casting, casting postheat treatment etc.;
(2) in alloying process, to the lot sequence that drops into alloying element in stove, be: (1) silicon, manganese, cerium; (2) chromium, molybdenum, lanthanum; (3) other remaining components; The timed interval that each batch drops into element is 22-25 minute, after feeding intake, stirs.
3. the production method of rare earth alloy steel for valve according to claim 2, it is characterized in that: described casting postheat treatment is: first by room temperature, with 190-200 ℃/h of speed, be warming up to 500-510 ℃, with 150-160 ℃/h of speed, be cooled to 400-410 ℃ again, with 190-200 ℃/h of speed, be warming up to 650-660 ℃ again, insulation 60-70 minute, with 200-220 ℃/h of speed, be warming up to 920-935 ℃ again, insulation 3-4 hour; With 160-170 ℃/h of speed, be cooled to 600-610 ℃ again, then be warming up to 720-730 ℃ with 190-200 ℃/h of speed, then be cooled to 500-510 ℃ with 150-160 ℃/h of speed, insulation 60-80 minute; With 150-160 ℃/h of speed, be cooled to 200-210 ℃ again, insulation 2-3 hour; With 190-200 ℃/h of speed, be warming up to 300-310 ℃ again, insulation 40-60 minute, then be warming up to 540-550 ℃ with 190-200 ℃/h of speed, insulation 2-3 hour, takes out air cooling and get final product.
4. the production method of rare earth alloy steel for valve according to claim 2, is characterized in that: instrument comminuted steel shot 3-4, zinc oxide 1-2, aluminium powder 1-2, SODIUMNITRATE 3-5, ground dolomite 3-4, kaolin 2-3, Zirconium tetrafluoride 1-2, jade powder 3-4, montmorillonite 1-2, Sodium Silicofluoride 2-3; Preparation method mixes each raw material, is heated to molten state, then, is poured into Quench in pure water, then is ground into 100-200 order powder; Gained powder is added and is equivalent to the silane resin acceptor kh-550 of powder weight 2-3%, the nano-carbon powder of 1-2%, after mixing, under 8-15Mpa, be pressed into base, then, at 900-950 ℃, calcine 3-4 hour, cooling after, be ground into again 150-250 order powder, obtain.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104550931A (en) * | 2014-12-25 | 2015-04-29 | 铜陵市经纬流体科技有限公司 | Scattering particle reinforced iron-based powder metallurgical valve and preparation method thereof |
| CN104550935A (en) * | 2014-12-25 | 2015-04-29 | 铜陵市经纬流体科技有限公司 | Powder metallurgy material for low-expansion valves and preparation method thereof |
| CN104561756A (en) * | 2014-12-31 | 2015-04-29 | 铜陵市经纬流体科技有限公司 | Soft real sluice valve body with excellent processability and preparation method of soft real sluice valve body |
| CN104588640A (en) * | 2014-12-25 | 2015-05-06 | 铜陵市经纬流体科技有限公司 | High-hardness ferrum-based powder metallurgy material for valve and preparing method thereof |
| CN108239729A (en) * | 2018-04-18 | 2018-07-03 | 明光市天淼新能源科技有限公司 | A kind of strong steel alloy of heat |
| CN109182924A (en) * | 2018-08-24 | 2019-01-11 | 江苏华太电力仪表有限公司 | A kind of low temperature resistant high-intensitive angle stop valves |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104550931A (en) * | 2014-12-25 | 2015-04-29 | 铜陵市经纬流体科技有限公司 | Scattering particle reinforced iron-based powder metallurgical valve and preparation method thereof |
| CN104550935A (en) * | 2014-12-25 | 2015-04-29 | 铜陵市经纬流体科技有限公司 | Powder metallurgy material for low-expansion valves and preparation method thereof |
| CN104588640A (en) * | 2014-12-25 | 2015-05-06 | 铜陵市经纬流体科技有限公司 | High-hardness ferrum-based powder metallurgy material for valve and preparing method thereof |
| CN104561756A (en) * | 2014-12-31 | 2015-04-29 | 铜陵市经纬流体科技有限公司 | Soft real sluice valve body with excellent processability and preparation method of soft real sluice valve body |
| CN108239729A (en) * | 2018-04-18 | 2018-07-03 | 明光市天淼新能源科技有限公司 | A kind of strong steel alloy of heat |
| CN109182924A (en) * | 2018-08-24 | 2019-01-11 | 江苏华太电力仪表有限公司 | A kind of low temperature resistant high-intensitive angle stop valves |
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Application publication date: 20140305 |