CN102433513A - Preparation and heat treatment method of low-alloy heat-resistant high-strength steel memebers - Google Patents
Preparation and heat treatment method of low-alloy heat-resistant high-strength steel memebers Download PDFInfo
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- CN102433513A CN102433513A CN2011103922089A CN201110392208A CN102433513A CN 102433513 A CN102433513 A CN 102433513A CN 2011103922089 A CN2011103922089 A CN 2011103922089A CN 201110392208 A CN201110392208 A CN 201110392208A CN 102433513 A CN102433513 A CN 102433513A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 36
- 239000010959 steel Substances 0.000 title claims abstract description 36
- 239000000956 alloy Substances 0.000 title claims abstract description 16
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 238000010438 heat treatment Methods 0.000 title abstract 4
- 238000005096 rolling process Methods 0.000 claims abstract description 21
- 239000004615 ingredient Substances 0.000 claims abstract description 5
- 238000007669 thermal treatment Methods 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 12
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 9
- 238000005255 carburizing Methods 0.000 claims description 9
- 238000010791 quenching Methods 0.000 claims description 9
- 230000000171 quenching effect Effects 0.000 claims description 9
- 238000005496 tempering Methods 0.000 claims description 9
- 239000012535 impurity Substances 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 238000011282 treatment Methods 0.000 claims description 6
- 241001062472 Stokellia anisodon Species 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 238000010891 electric arc Methods 0.000 claims description 3
- 239000001294 propane Substances 0.000 claims description 3
- 238000007670 refining Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 238000003723 Smelting Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
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- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to a preparation and heat treatment method of low-alloy heat-resistant high-strength steel memebers, which is characterized in that on the basis of 15CrMo, the steel ingredients are reasonably optimized, the heat-resistant memebers with excellent high-temperature performance and little deformation quantity are prepared and obtained through controlling preparation process parameters, such as smelting, rolling, heat treatment and the like, the room-temperature tensile strength of the memebers is 610 MPa, the effective service life of the memebers is twice that of the 15CrMo through the stress test of 200 MPa under 600 DEG C, the use temperature of the heat-resistant steel is obviously improved, the surface hardness after the heat treatment is about 750 HV, in addition, the thickness of a hardening layer with the hardness exceeding 500 HV is 0.5mm, the deformation quantity is little, in addition, the weldability is also very excellent, and the performance of the memebers in all aspects exceeds that of 15CrMo products.
Description
Technical field
The present invention relates to a kind of ferrous materials member, especially a kind of preparation and heat treating method of low-alloy refractory high-strength steel member.
Background technology
(be often referred to the doubly above temperature of 0.3-0.5 of material melting point) under the hot conditions; Steel with oxidation-resistance and sufficiently high temperature intensity and good heat-resistant is called high temperature steel; And in the high temperature steel the most representative one type be the low-alloy refractory high-strength steel; For example the 15CrMo of China promptly is a kind of typical low-alloy refractory high-strength steel, and 15CrMo is widely used in the pipeline, container, component of the main equipments that working conditionss are harsh, corrosive medium is complicated such as boiler, petrochemical complex, coal transform, steam turbine wheel cylinder body, thermoelectricity, nuclear power etc. because of its good heat-resistant, mechanical property, corrosion resistance nature.
Yet develop rapidly along with modern industry; 15CrMo heat-resistance high-strength steel more and more has been difficult to satisfy industrial equipments in higher requirements in aspect such as obdurability, creep properties, weldablenesies, optimizes that alloying constituent, adjustment are smelted, the processing parameter in the production engineering such as rolling becomes people day by day for improving the focus that the 15CrMo steel is paid close attention to.Simultaneously, owing to excellent abrasive that need will obtain and resistance to fatigue etc., also need carry out thermal treatments such as carburizing and quenching, and this often makes product produce certain deformation and influences dimensional accuracy of products to it.
Summary of the invention
To the problems referred to above; The object of the invention promptly is the composition of optimization design 15CrMo steel; And adjustment is smelted, the processing parameter of rolling, thermal treatment etc., thereby prepare the little novel low-alloy refractory high-strength steel member product of a kind of obdurability, solidity to corrosion, welding property excellent and thermal treatment after strain.
The technical scheme that the present invention adopted is following: a kind of preparation and heat treating method of low-alloy refractory high-strength steel member, and it may further comprise the steps:
The first, design the composition of said low-alloy refractory high-strength steel, in weight percentage (%), comprise: C 0.09-0.11, Si 0.06-0.2; Mn 0.06-0.35, Cr 1.3-1.5, Mo 0.35-0.45, P≤0.009; S≤0.006, Ni 0.2-0.4, Cu0.01-0.08, V 0.3-0.4; Nb 0.1-0.2, W 0.2-0.5, Ti 0.005-0.02, surplus is Fe and unavoidable impurities;
The second, smelt cast, comprise that electric arc furnace just refines, ladle RH handles with LF and handles, and the control molten steel meets chemical ingredients and requires the back cast, wherein carries out Argon at least 5 minutes with the pressure more than the 3atm during ladle refining, to help the come-up removal of impurity;
The 3rd; Rolling; Comprise equal thermal treatment, rolling and cooling, wherein all thermal treatment is soaking 4-6 hour at least in about 1100-1150 ℃ process furnace; Rolling start rolling temperature is about 1000-1100 ℃, finishing temperature and is about 840-880 ℃, and speed of cooling is about 5-10 ℃/s, final cooling temperature is about 650-680 ℃.
The 4th, the processing of member is processed into the size and dimension that needs with the low-alloy refractory high-strength steel after rolling, prepares member;
The 5th, the thermal treatment of member, member put into the carburizing treatment stove with vertical state after; Be heated to about 870-900 ℃, and with about 80-100 drip/minute speed splash into methyl alcohol, keep in the stove carbon potential at 0.8-0.9% through the flow of control propane simultaneously; Spread the about 2-2.5 of carburizing treatment hour; Subsequently member is pre-chilled to about 750-780 ℃ and reduces in the stove carbon potential simultaneously to about 0.7-0.75% and be incubated about 5-10 minute, then member is taken out from cementing furnace and be about direct quenching in 120-140 ℃ the cooling oil, carry out tempering after the quenching again in oily temperature; Tempering temperature is about 160-180 ℃, and tempering time is about 1-1.5 hour.
Down in the face of each step of the present invention explanation that makes an explanation:
The first, the choosing of chemical ingredients:
C 0.09-0.11%, the content of C and the obdurability of steel have direct relation, from the consideration of high temperature toughness and welding property; The C content of 15CrMo is reduced, but for guaranteeing the hot strength of steel, it should be 0.09% at least; For guaranteeing particularly weldableness of high temperature toughness, be at most 0.11% simultaneously.
Si 0.06-0.2%, Si are deoxidant element, guarantee deoxidation effect, should be 0.06% at least, but too much Si can reduce high temperature toughness, are at most 0.2% therefore.
Mn 0.06-0.35%, Mn also are deoxidant elements, guarantee deoxidation effect, should be 0.06% at least, but it also can seriously reduce high temperature toughness and hot strength, therefore on the basis of 15CrMo, adjust, and be at most 0.35%.
Cr 1.3-1.5%; Cr plays an important role for high-temperature oxidation resistance, hot strength and the high temperature corrosion-resisting property of high temperature steel; Increase the raising that its content to 1.3% will help the rigidity ability, but excessive increase also can reduce hot strength and high temperature toughness, be at most 1.5% therefore.
Mo 0.35-0.45%, Mo is favourable for the raising of strength, can also improve the weldableness of steel, and its content should be at least 0.35, but excessive Mo will reduce toughness, is at most 0.45% therefore
P≤0.009%, S≤0.006%, two kind of impurity element, under the situation that cost allows again, the low more raising that helps the performance of steel more of its content.
In addition, on the basis of 15CrMo, add an amount of following alloying element, to improve its each item performance:
Ni 0.2-0.4% adds the stability that Ni can improve tissue, and its content is at least 0.2% competence exertion better action, but excessive N i not only is unfavorable for practicing thrift cost but also reduce high temperature ductility, is at most 0.4% therefore.
Cu 0.01-0.08%, the effect of Cu is similar with Ni, repeats no more.
V 0.3-0.4%, V can improve strength, should guarantee to be at least 0.3%, but excessive interpolation is unfavorable for strength on the contrary, and reduce weldableness, be at most 0.4% therefore.
Nb 0.1-0.2%, the effect of Nb is similar with V, repeats no more.
W 0.2-0.5%, W is remarkable to the raising effect of strength, should guarantee to be at least 0.2%, but excessive interpolation reduces toughness, is at most 0.5% therefore.
Ti 0.005-0.02%, the main effect of Ti is to improve welding property, plays a role for guaranteeing it, is at least 0.005%, but excessive interpolation reduces toughness, is at most 0.02% therefore.
The second, smelting and rolling through the content of harmful elements such as refinement step such as RH, LF reduction O, P, S, is controlled the weave construction of steel through the adjustment of rolling technology.
The 3rd; Thermal treatment; Improve the hardness, wear resistance, fatigue property of steel etc. through carburizing and quenching; Wherein the selection of the modes of emplacement of workpiece, oil temperature is all to the good restraining effect of playing of member type variable, and carburizing and quenching, tempered processing parameter play conclusive effect for the member final properties.
Advantage of the present invention is: on the basis of 15CrMo, reasonably optimizing the component of steel, and through control smelt, preparation technology parameter such as rolling, thermal treatment; It is excellent to have prepared high-temperature behavior; The member that deflection is little particularly because deflection is little, need not after the thermal treatment to reprocess.
Embodiment
Below, through concrete embodiment the present invention is elaborated.
A kind of preparation and heat treating method of low-alloy refractory high-strength steel member, it may further comprise the steps:
The first, design the composition of said low-alloy refractory high-strength steel, in weight percentage (%), comprise: C 0.1, and Si 0.1; Mn 0.2, and Cr 1.2, and Mo 0.4, and P 0.009; S 0.006, and Ni 0.3, and Cu 0.05, and V 0.35; Nb 0.15, and W 0.3, and Ti 0.01, and surplus is Fe and unavoidable impurities;
The second, smelt cast, comprise that electric arc furnace just refines, ladle RH handles with LF and handles, and the control molten steel meets chemical ingredients and requires the back cast, and wherein the pressure with 5atm carried out Argon 5 minutes during ladle refining, to help the come-up removal of impurity;
The 3rd, rolling, comprise equal thermal treatment, rolling and cooling, wherein all thermal treatment is soaking at least 5 hours in 1130 ℃ process furnace, and rolling start rolling temperature is that 1050 ℃, finishing temperature are 860 ℃, and speed of cooling is that 8 ℃/s, final cooling temperature are 670 ℃;
The 4th, the processing of member is processed into the size and dimension that needs with the low-alloy refractory high-strength steel after rolling, prepares member;
The 5th, the thermal treatment of member, member put into the carburizing treatment stove with vertical state after; The vertical state here is meant with the longest one dimension of components three-dimensional and keeps vertical being as the criterion as far as possible, is heated to 890 ℃, and splashes into methyl alcohol with 90 droplets/minute speed; Keep through the flow of control propane that carbon potential spread carburizing treatment 2 hours 0.85% in the stove simultaneously, subsequently member is pre-chilled to 760 ℃ and reduces in the stove carbon potential to 0.7% simultaneously and be incubated 10 minutes; Then member is taken out from cementing furnace and be direct quenching in 125 ℃ the cooling oil in oily temperature; Carry out tempering after the quenching again, tempering temperature is 170 ℃, and tempering time is 1.5 hours.
The room temperature tensile strength of member of the present invention is 610MPa; Be about the twice of 15CrMo in its useful life under 600 ℃, under the 200MPa stress test, significantly improved the use temperature of high temperature steel, the surface hardness after the thermal treatment is about 750HV; And the thin hardened layer that hardness surpasses 500HV is 0.5mm; Deflection is little, and weldableness is also very excellent, we can say all to have surpassed the 15CrMo goods in all fields.
Claims (1)
1. the preparation and the heat treating method of a low-alloy refractory high-strength steel member, it may further comprise the steps:
The first, design the composition of said low-alloy refractory high-strength steel, in weight percentage (%), comprise: C 0.09-0.11, Si 0.06-0.2; Mn 0.06-0.35, Cr 1.3-1.5, Mo 0.35-0.45, P≤0.009; S≤0.006, Ni 0.2-0.4, Cu0.01-0.08, V 0.3-0.4; Nb 0.1-0.2, W 0.2-0.5, Ti 0.005-0.02, surplus is Fe and unavoidable impurities;
The second, smelt cast, comprise that electric arc furnace just refines, ladle RH handles with LF and handles, and the control molten steel meets chemical ingredients and requires the back cast, wherein carries out Argon at least 5 minutes with the pressure more than the 3atm during ladle refining, to help the come-up removal of impurity;
The 3rd; Rolling; Comprise equal thermal treatment, rolling and cooling, wherein all thermal treatment is soaking 4-6 hour at least in about 1100-1150 ℃ process furnace; Rolling start rolling temperature is about 1000-1100 ℃, finishing temperature and is about 840-880 ℃, and speed of cooling is about 5-10 ℃/s, final cooling temperature is about 650-680 ℃.
The 4th, the processing of member is processed into the size and dimension that needs with the low-alloy refractory high-strength steel after rolling, prepares member;
The 5th, the thermal treatment of member, member put into the carburizing treatment stove with vertical state after; Be heated to about 870-900 ℃, and with about 80-100 drip/minute speed splash into methyl alcohol, keep in the stove carbon potential at 0.8-0.9% through the flow of control propane simultaneously; Spread the about 2-2.5 of carburizing treatment hour; Subsequently member is pre-chilled to about 750-780 ℃ and reduces in the stove carbon potential simultaneously to about 0.7-0.75% and be incubated about 5-10 minute, then member is taken out from cementing furnace and be about direct quenching in 120-140 ℃ the cooling oil, carry out tempering after the quenching again in oily temperature; Tempering temperature is about 160-180 ℃, and tempering time is about 1-1.5 hour.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102649151A (en) * | 2012-05-31 | 2012-08-29 | 宝山钢铁股份有限公司 | Dummy head for continuous casting steel and manufacturing method thereof |
| CN103014595A (en) * | 2012-12-27 | 2013-04-03 | 金湖县常盛动力机械配件有限公司 | Carburizing method of low-carbon alloy steel |
| CN103320696A (en) * | 2013-06-06 | 2013-09-25 | 济钢集团有限公司 | Low-alloy heat-resistant steel plate and manufacturing method thereof |
| CN104259390A (en) * | 2012-10-22 | 2015-01-07 | 宁波吉威熔模铸造有限公司 | Casting method of automobile hoods |
| CN104630652A (en) * | 2015-02-12 | 2015-05-20 | 上海闵轩钢结构工程有限公司 | Low-alloy heat-resistant high-strength steel and steel member and preparation methods thereof |
| CN104630649A (en) * | 2015-02-12 | 2015-05-20 | 上海闵轩钢结构工程有限公司 | Low-alloy, heat-resistant and high-strength steel and member thereof |
| CN104946994A (en) * | 2015-06-30 | 2015-09-30 | 上海瀚氏模具成型有限公司 | Preparation method for nano-crystallization low-alloy heat-resistant high-strength steel mould |
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| CN105734441A (en) * | 2016-04-20 | 2016-07-06 | 上海瀚氏模具成型有限公司 | Preparation method of nanocrystallized low-alloy steel mould with heat resistance and high strength |
| CN105855810A (en) * | 2015-06-02 | 2016-08-17 | 余锦芳 | Shaft sleeve with excellent lubrication property |
| CN105973708A (en) * | 2016-06-30 | 2016-09-28 | 共享铸钢有限公司 | Tensile strength assessment method of high-alloy heat resistant steel |
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| CN101597720A (en) * | 2009-06-29 | 2009-12-09 | 周子钦 | A kind of high temperature resistance and high strength alloy steel and thermal treatment process thereof |
| CN102226254A (en) * | 2011-06-10 | 2011-10-26 | 钢铁研究总院 | High-strength high-toughness anticorrosion high-temperature bearing/pinion steel and preparation method thereof |
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| US20040202567A1 (en) * | 2003-01-23 | 2004-10-14 | Koyo Seiko Co., Ltd. | Steel for use in high strength pinion shaft and manufacturing method thereof |
| CN101597720A (en) * | 2009-06-29 | 2009-12-09 | 周子钦 | A kind of high temperature resistance and high strength alloy steel and thermal treatment process thereof |
| CN102226254A (en) * | 2011-06-10 | 2011-10-26 | 钢铁研究总院 | High-strength high-toughness anticorrosion high-temperature bearing/pinion steel and preparation method thereof |
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| CN102649151A (en) * | 2012-05-31 | 2012-08-29 | 宝山钢铁股份有限公司 | Dummy head for continuous casting steel and manufacturing method thereof |
| CN104259390B (en) * | 2012-10-22 | 2016-07-06 | 宁波吉威熔模铸造有限公司 | A kind of casting method of car engine cover |
| CN104259390A (en) * | 2012-10-22 | 2015-01-07 | 宁波吉威熔模铸造有限公司 | Casting method of automobile hoods |
| CN103014595A (en) * | 2012-12-27 | 2013-04-03 | 金湖县常盛动力机械配件有限公司 | Carburizing method of low-carbon alloy steel |
| CN103014595B (en) * | 2012-12-27 | 2014-11-26 | 金湖县常盛动力机械配件有限公司 | Carburizing method of low-carbon alloy steel |
| CN103320696A (en) * | 2013-06-06 | 2013-09-25 | 济钢集团有限公司 | Low-alloy heat-resistant steel plate and manufacturing method thereof |
| CN103320696B (en) * | 2013-06-06 | 2015-07-29 | 济钢集团有限公司 | A kind of Low-alloy heat-resistant steel plate and manufacture method thereof |
| CN104630652A (en) * | 2015-02-12 | 2015-05-20 | 上海闵轩钢结构工程有限公司 | Low-alloy heat-resistant high-strength steel and steel member and preparation methods thereof |
| CN104630649A (en) * | 2015-02-12 | 2015-05-20 | 上海闵轩钢结构工程有限公司 | Low-alloy, heat-resistant and high-strength steel and member thereof |
| CN105855810A (en) * | 2015-06-02 | 2016-08-17 | 余锦芳 | Shaft sleeve with excellent lubrication property |
| CN105855810B (en) * | 2015-06-02 | 2017-11-07 | 江苏雪梅制冷设备有限公司 | A kind of good axle sleeve of lubricity |
| CN104946994A (en) * | 2015-06-30 | 2015-09-30 | 上海瀚氏模具成型有限公司 | Preparation method for nano-crystallization low-alloy heat-resistant high-strength steel mould |
| CN105312854A (en) * | 2015-10-23 | 2016-02-10 | 中冶陕压重工设备有限公司 | Method for manufacturing housing wear-resisting plate of metallurgical hot mill |
| CN105734441A (en) * | 2016-04-20 | 2016-07-06 | 上海瀚氏模具成型有限公司 | Preparation method of nanocrystallized low-alloy steel mould with heat resistance and high strength |
| CN105973708A (en) * | 2016-06-30 | 2016-09-28 | 共享铸钢有限公司 | Tensile strength assessment method of high-alloy heat resistant steel |
| CN107554292A (en) * | 2016-06-30 | 2018-01-09 | 宁波高发汽车控制系统股份有限公司 | Electronic accelerator pedal assembly |
| CN109234666A (en) * | 2018-10-29 | 2019-01-18 | 汉德车桥(株洲)齿轮有限公司 | A kind of rare-earth carburizer and preparation method thereof, the passive roller gear of commercial axle master and its heat-treating methods |
| CN114164319A (en) * | 2021-11-08 | 2022-03-11 | 安徽首矿大昌金属材料有限公司 | Manufacturing method of foot roller blank for chamfering crystallizer |
| CN114164319B (en) * | 2021-11-08 | 2023-08-08 | 安徽首矿大昌金属材料有限公司 | Manufacturing method of foot roller blank for chamfer crystallizer |
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| CN102433513B (en) | 2013-05-08 |
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