CN102703825A - Preparation method of improved 30CrMnSi steel - Google Patents

Preparation method of improved 30CrMnSi steel Download PDF

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Publication number
CN102703825A
CN102703825A CN2012101922784A CN201210192278A CN102703825A CN 102703825 A CN102703825 A CN 102703825A CN 2012101922784 A CN2012101922784 A CN 2012101922784A CN 201210192278 A CN201210192278 A CN 201210192278A CN 102703825 A CN102703825 A CN 102703825A
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Prior art keywords
steel
30crmnsi
30crmnsi steel
temperature
quenching
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CN2012101922784A
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Chinese (zh)
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唐海峰
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唐海峰
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Abstract

The invention relates to a preparation method of improved 30CrMnSi steel. The improved 30CrMnSi steel comprises the following components in percentage by weight: 0.27-0.34% of C, 0.90-1.20% of Si, 0.80-1.10% of Mn, 0.80-1.10% of Cr, 0.06-0.08% of Re, 0.009-0.012% of B and the balance of Fe; and the preparation method comprises the following steps of: (1) smelting by a medium-frequency coreless induction furnace, taking steel as a main raw material, and adding the proper quantities of chromium iron, manganese iron, silicon iron, boron iron, rare earth and other alloys according to the mixture ratio of the components for alloying; (2) adopting clay sand and tidal stencils, casting to form a standard wedge-shaped or trapezoidal test piece blank, and performing annealing treatment on a test piece; (3) enabling the prepared 30CrMnSi steel to complete austenization treatment at the temperature which is about 840 DEG C for 550-600s; (4) further performing isothermal quenching or incomplete quenching at the temperature of 180-300 DEG C after the step (3), and keeping the temperature for 300s-500s; and (5) further quenching to room temperature after the step (4) so as to get the 30CrMnSi steel with good performances. According to the preparation method disclosed by the invention, the high strength of the 30CrMnSi steel is kept, the 30CrMnSi steel simultaneously has a certain plasticity, and the comprehensive mechanical properties can be significantly improved in comparison with a traditional heat treatment process.

Description

A kind of preparation method of improved 30CrMnSi steel
Technical field
The present invention relates to a kind of preparation method of improved 30CrMnSi steel.
Background technology
The 30CrMnSi steel is high-intensity quenched and tempered steel, has very high intensity and toughness, and hardening capacity is higher, and cold deformation plasticity is medium, and machinability is good.Because it does not contain precious metal element; Low price; Be used to make high loading, the various strength members of high speed more,, also be used to make part wear-resisting, that working temperature is not high like gear, axle, clutch coupling, sprocket wheel, grinding wheel spindle, axle sleeve, bolt, nut etc.; The welding assembly of variable load; Blade, valve plate and non-aggressive pipeline pipe like high pressure blower also are applied to crucial load-carrying members such as space shuttle axle, beam and gear etc. and space rocket, nuclear industry, are commercial the earliest one type of low-alloy super-strength steels.
The 30CrMnSi steel has the temper brittleness tendency, and horizontal impact toughness is poor.Welding property is better, but thickness should be preheating to 150 ℃ earlier during greater than 3mm, and postwelding needs thermal treatment.The 30CrMnSi steel is on the basis of modified structure iron, to grow up, and through adding a spot of alloying element, reaches solution strengthening and improves the hardening capacity of steel and the purpose of martenaging martempering stability.The alloying element total content of this type steel generally is not higher than 5%, and carbon content is between 0.25-0.50%, and the 30CrMnSi steel heat treatment process carries out temper after being generally quenching again.But traditional thermal treatment process can not be taken into account HS and the well requirement of plasticity and toughness: keep about its tensile strength 1500-1600MPa then plasticity lower (unit elongation is only about 3%-6%), the very high easy generation low stress brittle fracture of crack sensitivity if reduce tempering temperature; Can improve plasticity (unit elongation>10%) if improve tempering temperature, but intensity declines to a great extent to 1000-1100MPa.For this reason; Need the simple and easy to do slack quenching-isothermal partition New Technology of Heat Treatment of exploitation; Under the prerequisite that guarantees suitable plasticity, significantly improve the tensile strength of steel, perhaps significantly improve plasticity and toughness, thereby the difference that realizes HS, high-plasticity cooperates in the high-intensity while of assurance.
Summary of the invention
The present invention will solve existing traditional thermal treatment process to handle the problem that low-carbon (LC) chrome-silicon manganese low alloy steel can not be taken into account the requirement of HS and good plasticity and toughness that obtains; The heat treating method of low-carbon (LC) chrome-silicon manganese low alloy steel is provided; Processing is possessed the good strength and the low-carbon (LC) chrome-silicon manganese low alloy steel of plasticity preferably simultaneously, reaches better comprehensive mechanical property.
Technical scheme of the present invention is: a kind of preparation method of improved 30CrMnSi steel, it is characterized in that, and comprise following component (wt%):
C:0.27~0.34?  
Si:0.90~1.20?  
Mn:0.80~1.10
Cr:0.80~1.10
Re:0.06~0.08
B:0.009~0.012
All the other are Fe;
And make through following steps:
1) using the medium frequency response ratio melting, is main raw material with the steel, according to above set of dispense ratio, adds alloys such as an amount of ferrochrome, ferromanganese, ferrosilicon, ferro-boron, rare earth, carries out alloying;
2) adopt clay-bonded sand, tidal stencils, be cast into the wedge type and the ladder type test specimen blank of standard, test specimen carries out anneal;
3) the 30CrMnSi steel that makes is incubated 550~600s about 840 ℃ and accomplishes the austenitizing processing;
4) through after the step 3), under 180~300 ℃ temperature, carry out isothermal quenching or slack quenching again, insulation 300s~500s;
5) through after the step 4), be quenched to room temperature again, promptly obtain well behaved 30CrMnSi steel.
The present invention has selected suitable component and proportioning through a large amount of tests, through in steel, adding the effect that proper amount of rare-earth can play refinement, purification, alloying, each item performance of steel is increased.The adding of an amount of boron makes this steel can carry out dry quenching, simplifies thermal treatment process, reduces workpiece deformation, thereby reduces cost.In addition; Thermal treatment process of the present invention with low-carbon (LC) chromium manganese silicon low-alloy steel austenitizing after; Earlier about 840 ℃, carry out isothermal quenching or slack quenching obtains partial martensite and do not change austenite, in 180~300 ℃ temperature range, be incubated then, the before formation martensite of carbon is spread in not changing austenite and make it stabilization; Be quenched into room temperature at last, obtain the heterogeneous structure of forming by low carbon martensite and rich carbon austenitic.With respect to traditional Q-tempering technology, thermal treatment process of the present invention can make martensitic steel under the prerequisite that keeps strength level, obviously improve plasticity and toughness.
Beneficial effect of the present invention is that the tensile strength of the low-carbon (LC) chrome-silicon manganese low alloy steel after the high tough quenching-partition heat treating method of low-carbon (LC) chrome-silicon manganese low alloy steel of the present invention is handled reaches more than the 1600MPa, and plasticity is more than 10% simultaneously.Guaranteeing that this steel series keeps high-intensity and has certain plasticity simultaneously concurrently, and comprehensive mechanical property significantly improves than traditional Q-tempering thermal treatment process.
Embodiment
Through concrete example technical scheme of the present invention is described below.
Embodiment 1
A kind of preparation method of improved 30CrMnSi steel is characterized in that, comprises following component (wt%):
C:0.27?  
Si:?0.90?  
Mn:0.80
Cr:0.80
Re:0.06
B:0.009
All the other are Fe;
And make through following steps:
1) using the medium frequency response ratio melting, is main raw material with the steel, according to above set of dispense ratio, adds alloys such as an amount of ferrochrome, ferromanganese, ferrosilicon, ferro-boron, rare earth, carries out alloying;
2) adopt clay-bonded sand, tidal stencils, be cast into the wedge type and the ladder type test specimen blank of standard, test specimen carries out anneal;
3) the 30CrMnSi steel that makes is incubated 550s about 840 ℃ and accomplishes the austenitizing processing;
4) through after the step 3), under 180 ℃ temperature, carry out isothermal quenching or slack quenching again, insulation 30s;
5) through after the step 4), be quenched to room temperature again, promptly obtain well behaved 30CrMnSi steel;
Through above-mentioned steps, the heterogeneous structure of the 30CrMnSi steel that obtains for forming by low carbon martensite and rich carbon austenitic, through test, tensile strength is 1640MPa, and plasticity reaches 11.9%.
Embodiment 2
A kind of preparation method of improved 30CrMnSi steel is characterized in that, comprises following component (wt%):
C:0.34?  
Si:1.20?  
Mn:?1.10
Cr:?1.10
Re:?0.08
B:?0.012
All the other are Fe;
And make through following steps:
1) using the medium frequency response ratio melting, is main raw material with the steel, according to above set of dispense ratio, adds alloys such as an amount of ferrochrome, ferromanganese, ferrosilicon, ferro-boron, rare earth, carries out alloying;
2) adopt clay-bonded sand, tidal stencils, be cast into the wedge type and the ladder type test specimen blank of standard, test specimen carries out anneal;
3) the 30CrMnSi steel that makes is incubated 600s about 840 ℃ and accomplishes the austenitizing processing;
4) through after the step 3), under 300 ℃ temperature, carry out isothermal quenching or slack quenching again, insulation 500s;
5) through after the step 4), be quenched to room temperature again, promptly obtain well behaved 30CrMnSi steel;
Through test, tensile strength is 1710MPa, and plasticity reaches 13.5%.
Embodiment 3
A kind of preparation method of improved 30CrMnSi steel is characterized in that, comprises following component (wt%):
C:0.31?  
Si:1.05?  
Mn:0.9
Cr:1.02
Re:0.07
B:0.01
All the other are Fe;
And make through following steps:
1) using the medium frequency response ratio melting, is main raw material with the steel, according to above set of dispense ratio, adds alloys such as an amount of ferrochrome, ferromanganese, ferrosilicon, ferro-boron, rare earth, carries out alloying;
2) adopt clay-bonded sand, tidal stencils, be cast into the wedge type and the ladder type test specimen blank of standard, test specimen carries out anneal;
3) the 30CrMnSi steel that makes is incubated 590s about 840 ℃ and accomplishes the austenitizing processing;
4) through after the step 3), under 260 ℃ temperature, carry out isothermal quenching or slack quenching again, insulation 400s;
5) through after the step 4), be quenched to room temperature again, promptly obtain well behaved 30CrMnSi steel;
Through test, tensile strength is 1690MPa, and plasticity reaches 10.9%.

Claims (1)

1. the preparation method of an improved 30CrMnSi steel is characterized in that, comprises following component (wt%):
C:0.27~0.34?  
Si:0.90~1.20?  
Mn:0.80~1.10
Cr:0.80~1.10
Re:0.06~0.08
B:0.009~0.012
All the other are Fe;
And make through following steps:
1) using the medium frequency response ratio melting, is main raw material with the steel, according to above set of dispense ratio, adds alloys such as an amount of ferrochrome, ferromanganese, ferrosilicon, ferro-boron, rare earth, carries out alloying;
2) adopt clay-bonded sand, tidal stencils, be cast into the wedge type and the ladder type test specimen blank of standard, test specimen carries out anneal;
3) the 30CrMnSi steel that makes is incubated 550~600s about 840 ℃ and accomplishes the austenitizing processing;
4) through after the step 3), under 180~300 ℃ temperature, carry out isothermal quenching or slack quenching again, insulation 300s~500s;
5) through after the step 4), be quenched to room temperature again, promptly obtain well behaved 30CrMnSi steel.
CN2012101922784A 2012-06-12 2012-06-12 Preparation method of improved 30CrMnSi steel Pending CN102703825A (en)

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Application Number Priority Date Filing Date Title
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CN102703825A true CN102703825A (en) 2012-10-03

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102876867A (en) * 2012-10-17 2013-01-16 夏雨 Heat treatment method of medium-high carbon steel
CN102876981A (en) * 2012-10-17 2013-01-16 夏雨 Method for preparing medium and low carbon chrome-silicon-manganese martensite cast steel with hardening surface layer
CN103627960A (en) * 2013-12-10 2014-03-12 南昌航空大学 Wear-resistant cast steel
CN104975228A (en) * 2015-06-30 2015-10-14 柳州金特新型耐磨材料股份有限公司 Lost foam 30CrMnSi material
CN105755390A (en) * 2016-05-10 2016-07-13 王烈 Coal machine pin-track and coal machine scraper cast by ultra-high strength wear-resistant steel and production process thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101074472A (en) * 2006-05-18 2007-11-21 中国船舶重工集团公司第七二五研究所 Ultrahigh-strength and high-toughness welded cast steel
CN101988173A (en) * 2009-07-30 2011-03-23 郑州四维机电设备制造有限公司 Cast steel material and preparation method thereof
CN102660712A (en) * 2012-06-08 2012-09-12 黄凯敏 Improved 30CrMnSi steel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101074472A (en) * 2006-05-18 2007-11-21 中国船舶重工集团公司第七二五研究所 Ultrahigh-strength and high-toughness welded cast steel
CN101988173A (en) * 2009-07-30 2011-03-23 郑州四维机电设备制造有限公司 Cast steel material and preparation method thereof
CN102660712A (en) * 2012-06-08 2012-09-12 黄凯敏 Improved 30CrMnSi steel

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102876867A (en) * 2012-10-17 2013-01-16 夏雨 Heat treatment method of medium-high carbon steel
CN102876981A (en) * 2012-10-17 2013-01-16 夏雨 Method for preparing medium and low carbon chrome-silicon-manganese martensite cast steel with hardening surface layer
CN103627960A (en) * 2013-12-10 2014-03-12 南昌航空大学 Wear-resistant cast steel
CN104975228A (en) * 2015-06-30 2015-10-14 柳州金特新型耐磨材料股份有限公司 Lost foam 30CrMnSi material
CN105755390A (en) * 2016-05-10 2016-07-13 王烈 Coal machine pin-track and coal machine scraper cast by ultra-high strength wear-resistant steel and production process thereof

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Application publication date: 20121003