CN105256238B - A kind of preparation method of auto parts low-carbon martensite non-hardened and tempered steel - Google Patents
A kind of preparation method of auto parts low-carbon martensite non-hardened and tempered steel Download PDFInfo
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Abstract
A kind of auto parts low-carbon martensite non-hardened and tempered steel and preparation method thereof, low-carbon martensite non-hardened and tempered steel chemical composition of the present invention and its percentage by weight are：C：0.07~0.22；Si：1.1~2.5；Mn：1.2~2.5；Cr：0.3~1.2；Cu：0.05~0.4；Mo：0.1~0.3；V：0.05~0.15；P：＜ 0.035；S：＜ 0.06, surplus is Fe；Method includes：1st, weighed by above-mentioned formula uses vacuum or conventional method to be smelted into ingot casting after dispensing；2nd, forged or rolled after ingot casting being heated into 1100~1200 DEG C of 1~2h of insulation, the shape and size of workpiece, are then air-cooled to room temperature needed for obtaining；3rd, workpiece is tempered 2h at 200 DEG C, obtains low-carbon martensite type tissue；Steel of the present invention has high quenching degree and with good comprehensive mechanical property；Steel preparation technology of the present invention is simple, energy-saving, reduces manufacturing cost.
Description
Technical field
The invention belongs to the quenched low-alloy steel manufacturing technology field of automobile, more particularly to a kind of auto parts low-carbon geneva
The preparation method of body non-hardened and tempered steel.
Background technology
The comprehensive mechanical property of material is the key factor for ensureing vehicle safety, and by taking automobile front axle as an example, front axle is vapour
One of important security personnel's component in Chinese herbaceous peony axle assembly, its inherent quality and material property directly affect the safety of automobile steering system
The service life of reliability and automobile.It is therefore desirable to which preceding shaft material should have enough intensity and plasticity and toughness.It is domestic at present heavy
Truck producer front axle material generally uses 42CrMo and carries out modifier treatment to meet its requirement to material mechanical performance, but adjusts
Matter processing needs larger energy resource consumption and pollution environment.Can effectively energy-saving and emission-reduction, reduction environment dirt using non-hardened and tempered steel
Dye, cost can also be significantly reduced, while can also reduce it is quenched during quench caused by deformation and ftracture.Using Micro Alloying
Steel substitutes the trend that traditional quenched and tempered steel has been automobile industry development.
The research of non-hardened and tempered steel is gradually risen from 1970s, in the early 1980s, Thyssen company takes the lead in
Develop a class New Type Non-Quenched-Tempered Steels 49MnVS3 and be supplied to auto industry.At present, non-hardened and tempered steel material typically selects medium carbon steel
Add microalloy element (V, Ti, Nb etc.) and carry out dispersion-strengtherning, such as European 30MnVS6,38MnVS6,46MnVS6 and South Korea
T1 Q+T, T3 A/C, T4 A/C use V V-N steels, and China Patent Publication No. CN102199731B is " a kind of composite micro-alloyed
The heavy in section non-hardened and tempered steel of change " is using the micro- complex intensifying such as Nb, V, Ti, B；Another non-hardened and tempered steel then selects mild steel
Addition expands the element and crystal grain thinning element in bainite transformation region, controls cooling velocity, obtain low-carbon bainite tissue with
The purpose of reinforcing is reached, the 25MnCrSiVB6, Chinese Jiangling company such as the exploitation of A Sailuo Arcelor Mittal Steels group are developed
12Mn2VBS and a vapour company and the 25Mn2CrV (FAS2225) of northeast special steel cooperative development.Bainitic steel is micro- relative to middle carbon
Alloy strengthening steel has higher toughness, but needs increase control-cooling equipment in actual production and be controlled cooling, technique phase
To complexity, and compared with 42CrMo quenched and tempered steel, intensity is relatively low, as shown in table 1.It yet there are no empty on auto parts low-carbon
The relevant report of cold martensite steel.
The mechanical property of the 42CrMo quenched and tempered steel of table 1 and Bainitic Steels
The content of the invention
In order to overcome the above-mentioned deficiencies of the prior art, low-carbon horse is used object of the present invention is to provide a kind of auto parts
Family name's body non-hardened and tempered steel and preparation method thereof, with simple production process, saves the energy, reduces pollution, reduces production cost, excellent
Obdurability the characteristics of.
To achieve these goals, the technical solution adopted by the present invention is：
A kind of auto parts low-carbon martensite non-hardened and tempered steel, prepares the component of gained finished product by mass percentage
(wt.%) it is：C：0.07%~0.22wt.%；Si：1.1%~2.5%；Mn：1.2%~2.5%；Cr：0.3%~
1.2%；Cu：0.05%~0.4%；Mo：0.1%~0.3%；V：0.05%~0.15%；P：＜ 0.035%；S：＜
0.06%, surplus is Fe.
A kind of auto parts preparation method of low-carbon martensite non-hardened and tempered steel, comprises the steps：
Step one：Raw material proportioning
Steelmaking feed is chosen, steelmaking feed includes：Ferrochrome that amount containing Cr is 60%, the ferromanganese that amount containing Mn is 82.5%, contain
Vanadium iron, 10# steel, the pig iron and fine copper that ferrosilicon that Si amounts are 70%, the molybdenum-iron that amount containing Mo is 60%, V content are 50%, steel-making are former
Material selection amount is matched according to following gross mass number：Elements C：0.07%~0.22%；Si：1.1%~2.5%；Mn：
1.2%~2.5%；Cr：0.3%~1.2%；Cu：0.05%~0.4%；Mo：0.1%~0.3%；V：0.05%~
0.15%；Surplus is to contain P and S in Fe and other inevitable impurity, impurity, and described P and S scope control should be P：
＜ 0.035%；S：＜ 0.06%；
Step 2：Alloy melting
The raw material got ready according to step one, first by raw material 10# steel, ferrochrome, ferrosilicon and the melting of pig iron heat temperature raising to raw material
Molten steel is fused into, then vanadium iron, molybdenum-iron, fine copper and ferromanganese are sequentially added into molten steel, the homogenization of composition up to adding is incubated, so
After be cast into ingot casting, cast temperature is controlled at 1530~1580 DEG C, and the element constituent for obtaining ingot casting is C：0.07~0.22；
Si：1.1~2.5；Mn：1.2~2.5；Cr：0.3~1.2；Cu：0.05~0.4；Mo：0.1~0.3；V：0.05~0.15；P：
＜ 0.035；S：＜ 0.06, surplus is Fe and other inevitable impurity；
Step 3：Heating and thermal insulation is forged
The ingot casting obtained in step 2 is heated to after 1100~1200 DEG C to be incubated 1~2h, is then forged or is rolled,
The shape and size of workpiece, are then cooled to room temperature in atmosphere needed for obtaining；
Step 4：Tempering
Gained workpiece heat in step 3, to 2h is incubated after 200 DEG C, is finally given into low-carbon martensite type tissue；Additionally
There is a small amount of granular bainite, the volume fraction of bainite is less than 30%, and its mechanical property is：Rp0.2>=750MPa, Rm≥
1050MPa, A >=14%, AkU≥70J。
Melting to melting sources into molten steel is entered in electromagnetic induction furnace vacuum melting or conventional method in described step two
Row melting.
Beneficial effects of the present invention：
1st, non-hardened and tempered steel of the invention obtains high quenching degree by the optimization design of alloying element, and Ф 70mm pole is empty
It is cold can through hardening completely, without increasing extra control-cooling equipment and controlling cold technique, simple production process saves the energy, reduces pollution, drop
Low production cost.
2nd, non-hardened and tempered steel of the invention has excellent obdurability, and comprehensive mechanical property is better than 42CrMo quenched and tempered steel.
Brief description of the drawings
Fig. 1 is air cooling and the macrograph after 200 DEG C of tempering 2h after 1# materials are rolled.
Fig. 2 is air cooling and the macrograph after 200 DEG C of tempering 2h after 3# materials are forged.
Fig. 3 is air cooling and the macrograph after 200 DEG C of tempering 2h after 6# materials are forged.
Fig. 4 is the tension test mechanical curves of 2#, 4#, 6# material.
Embodiment
The present invention is described in further details with reference to embodiment.
Embodiment one
Step one：Raw material proportioning
Steelmaking feed is chosen, steelmaking feed includes：Ferrochrome that amount containing Cr is 60%, the ferromanganese that amount containing Mn is 82.5%, contain
Vanadium iron and 10# steel, the pig iron and fine copper that ferrosilicon that Si amounts are 70%, the molybdenum-iron that amount containing Mo is 60%, V content are 50%, refining
Steel raw material selection amount is matched according to following gross mass number：C：0.07%；Si：2.0%；Mn：2.5%；Cr：0.30%；
Cu：0.07%；Mo：0.20%；V：0.15%；Surplus is to contain P and S in Fe and other inevitable impurity, impurity, described
P and S scope control should be P：＜ 0.035%；S：＜ 0.06%；
Step 2：Alloy melting
According to the element ratio in step one, then in electromagnetic induction furnace vacuum melting, by raw material 10# steel, ferrochrome, ferrosilicon
And the melting of pig iron heat temperature raising is to melting sources into molten steel, then into molten steel vanadium iron, molybdenum-iron, fine copper and ferromanganese are sequentially added, protected
Temperature is until the homogenization of composition added, is then cast into Ф 150mm ingot castings, and cast temperature is controlled at 1550 ± 10 DEG C, cast
The composition of ingot is the ingot casting of 1# compositions in table 2；
Step 3：Heating and thermal insulation is forged
The ingot casting obtained in step 2 is heated to after 1100 DEG C to be incubated 2h, then forged according to Ф 70mm size
Make, obtain the pole that workpiece size is Ф 70mm, room temperature is then cooled in atmosphere；
Step 4：Tempering
2h is incubated after the pole of the Ф 70mm of gained in step 3 is heated into 200 DEG C, the 1# high intensity of table 3 is finally given
Low-carbon martensite type workpiece, Ф 70mm poles can through hardening completely from surface to center portion.
Embodiment two
Step one：Raw material proportioning
Steelmaking feed is chosen, steelmaking feed includes：Ferrochrome that amount containing Cr is 60%, the ferromanganese that amount containing Mn is 82.5%, contain
Vanadium iron and 10# steel, the pig iron and fine copper that ferrosilicon that Si amounts are 70%, the molybdenum-iron that amount containing Mo is 60%, V content are 50%, refining
Steel raw material selection amount is matched according to following gross mass number：C：0.10%；Si：1.1%；Mn：2.4%；Cr：0.50%；
Cu：0.25%；Mo：0.10%；V：0.10%；Surplus is to contain P and S in Fe and other inevitable impurity, impurity, described
P and S scope control should be P：＜ 0.035%；S：＜ 0.06%；
Step 2：Alloy melting
According to the element ratio in step one, then in electromagnetic induction furnace vacuum melting, by raw material 10# steel, ferrochrome, ferrosilicon
And the melting of pig iron heat temperature raising is to melting sources into molten steel, then into molten steel vanadium iron, molybdenum-iron, fine copper and ferromanganese are sequentially added, protected
Temperature is until the homogenization of composition added, is then cast into Ф 150mm ingot castings, and cast temperature is controlled at 1560 ± 10 DEG C, cast
The composition of ingot is the ingot casting of 2# compositions in table 2；
Step 3：Heating and thermal insulation is forged
The ingot casting obtained in step 2 is heated to after 1150 DEG C to be incubated 2h, then carried out according to 70mm × 70mm size
Forging, obtains 70mm × 70mm rod, room temperature is then cooled in atmosphere；
Step 4：Tempering
Gained 70mm × 70mm workpiece heats in step 3, to 2h is incubated after 200 DEG C, are finally given into the 2# high intensity of table 3
Low-carbon martensite type workpiece, 70mm × 70mm workpiece can through hardening completely from surface to center portion.
Embodiment three
Step one：Raw material proportioning
Steelmaking feed is chosen, steelmaking feed includes：Ferrochrome that amount containing Cr is 60%, the ferromanganese that amount containing Mn is 82.5%, contain
Vanadium iron and 10# steel, the pig iron and fine copper that ferrosilicon that Si amounts are 70%, the molybdenum-iron that amount containing Mo is 60%, V content are 50%, refining
Steel raw material selection amount is matched according to following gross mass number：C：0.11%；Si：1.4%；Mn：1.5%；Cr：1.2%；
Cu：0.11%；Mo：0.15%；V：0.05%；Surplus is to contain P and S in Fe and other inevitable impurity, impurity, described
P and S scope control should be P：＜ 0.035%；S：＜ 0.06%；
Step 2：Alloy melting
According to the element ratio in step one, then in electromagnetic induction furnace vacuum melting, by raw material 10# steel, ferrochrome, ferrosilicon
And the melting of pig iron heat temperature raising is to melting sources into molten steel, then into molten steel vanadium iron, molybdenum-iron, fine copper and ferromanganese are sequentially added, protected
Temperature is until the homogenization of composition added, is then cast into Ф 150mm ingot castings, and cast temperature is controlled at 1570 ± 10 DEG C, cast
The composition of ingot is the ingot casting of 3# compositions in table 2；
Step 3：Heating and thermal insulation is forged
The ingot casting obtained in step 2 is heated to after 1150 DEG C to be incubated 2h, then forged according to Ф 50mm size
Make, obtain Ф 50mm rod, room temperature is then cooled in atmosphere；
Step 4：Tempering
By the workpiece heat of gained Ф 50mm in step 3 to 2h is incubated after 200 DEG C, the 3# high intensity for finally giving table 3 is low
Carbon martensite type workpiece, Ф 50mm workpiece can through hardening completely from surface to center portion.
Example IV
Step one：Raw material proportioning
Steelmaking feed is chosen, steelmaking feed includes：Ferrochrome that amount containing Cr is 60%, the ferromanganese that amount containing Mn is 82.5%, contain
Vanadium iron and 10# steel, the pig iron and fine copper that ferrosilicon that Si amounts are 70%, the molybdenum-iron that amount containing Mo is 60%, V content are 50%, refining
Steel raw material selection amount is matched according to following gross mass number：C：0.13%；Si：1.5%；Mn：1.7%；Cr：0.60%；
Cu：0.40%；Mo：0.30%；V：0.07%；Surplus is to contain P and S in Fe and other inevitable impurity, impurity, described
P and S scope control should be P：＜ 0.035%；S：＜ 0.06%.
Step 2：Alloy melting
According to the element ratio in step one, then in electromagnetic induction furnace vacuum melting, by raw material 10# steel, ferrochrome, ferrosilicon
And the melting of pig iron heat temperature raising is to melting sources into molten steel, then into molten steel vanadium iron, molybdenum-iron, fine copper and ferromanganese are sequentially added, protected
Temperature is until the homogenization of composition added, is then cast into Ф 150mm ingot castings, and cast temperature is controlled at 1550 ± 10 DEG C, cast
The composition of ingot is the ingot casting of 4# compositions in table 2；
Step 3：Heating and thermal insulation is forged
The ingot casting obtained in step 2 is heated to after 1200 DEG C to be incubated 2h, then carried out according to 70mm × 70mm size
Forging, obtains 70mm × 70mm rod, room temperature is then cooled in atmosphere；
Step 4：Tempering
Gained 70mm × 70mm workpiece heats in step 3, to 2h is incubated after 200 DEG C, are finally given into the 4# high intensity of table 3
Low-carbon martensite type workpiece, 70mm × 70mm workpiece can through hardening completely from surface to center portion.
Embodiment five
Step one：Raw material proportioning
Steelmaking feed is chosen, steelmaking feed includes：Ferrochrome that amount containing Cr is 60%, the ferromanganese that amount containing Mn is 82.5%, contain
Vanadium iron and 10# steel, the pig iron and fine copper that ferrosilicon that Si amounts are 70%, the molybdenum-iron that amount containing Mo is 60%, V content are 50%, refining
Steel raw material selection amount is matched according to following gross mass number：C：0.15%；Si：1.3%；Mn：1.5%；Cr：0.30%；
Cu：0.05%；Mo：0.15%；V：0.10%, surplus is to contain P and S in Fe and other inevitable impurity, impurity, described
P and S scope control should be P：＜ 0.035%；S：＜ 0.06%；
Step 2：Alloy melting
According to the element ratio in step one, then in electromagnetic induction furnace vacuum melting, by raw material 10# steel, ferrochrome, ferrosilicon
And the melting of pig iron heat temperature raising is to melting sources into molten steel, then into molten steel vanadium iron, molybdenum-iron, fine copper and ferromanganese are sequentially added, protected
Temperature is until the homogenization of composition added, is then cast into Ф 150mm ingot castings, and cast temperature is controlled at 1540 ± 10 DEG C, cast
The composition of ingot is the ingot casting of 5# compositions in table 2；
Step 3：Heating and thermal insulation is forged
The ingot casting obtained in step 2 is heated to after 1200 DEG C to be incubated 2h, then forged according to Ф 70mm size
Make, obtain Ф 70mm rod, room temperature is then cooled in atmosphere；
Step 4：Tempering
Gained Ф 70mm workpiece heats in step 3, to 2h is incubated after 200 DEG C, are finally given into the 5# high strength low-carbons of table 3
Martensite type workpiece, Ф 70mm workpiece can through hardening completely from surface to center portion.
Embodiment six
Step one：Raw material proportioning
Steelmaking feed is chosen, steelmaking feed includes：Ferrochrome that amount containing Cr is 60%, the ferromanganese that amount containing Mn is 82.5%, contain
Vanadium iron and 10# steel, the pig iron and fine copper that ferrosilicon that Si amounts are 70%, the molybdenum-iron that amount containing Mo is 60%, V content are 50%, refining
Steel raw material selection amount is matched according to following gross mass number：C：0.17%；Si：1.3%；Mn：1.2%；Cr：0.50%；
Cu：0.20%；Mo：0.15%；V：0.08%, surplus is to contain P and S in Fe and other inevitable impurity, impurity, described
P and S scope control should be P：＜ 0.035%；S：＜ 0.06%；
Step 2：Alloy melting
According to the element ratio in step one, then in electromagnetic induction furnace vacuum melting, by raw material 10# steel, ferrochrome, ferrosilicon
And the melting of pig iron heat temperature raising is to melting sources into molten steel, then into molten steel vanadium iron, molybdenum-iron, fine copper and ferromanganese are sequentially added, protected
Temperature is until the homogenization of composition added, is then cast into Ф 150mm ingot castings, and cast temperature is controlled at 1550 ± 10 DEG C, cast
The composition of ingot is the ingot casting of 6# compositions in table 2；
Step 3：Heating and thermal insulation is forged
The ingot casting obtained in step 2 is heated to after 1200 DEG C to be incubated 2h, then carried out according to 50mm × 50mm size
Forging, obtains 50mm × 50mm rod, room temperature is then cooled in atmosphere；
Step 4：Tempering
Gained 50mm × 50mm workpiece heats in step 3, to 2h is incubated after 200 DEG C, are finally given into the 6# high intensity of table 3
Low-carbon martensite type workpiece, 50mm × 50mm workpiece can through hardening completely from surface to center portion.
Embodiment seven
Step one：Raw material proportioning
Steelmaking feed is chosen, steelmaking feed includes：Ferrochrome that amount containing Cr is 60%, the ferromanganese that amount containing Mn is 82.5%, contain
Vanadium iron and 10# steel, the pig iron and fine copper that ferrosilicon that Si amounts are 70%, the molybdenum-iron that amount containing Mo is 60%, V content are 50%, refining
Steel raw material selection amount is matched according to following gross mass number：C：0.19%；Si：1.4%；Mn：2.1%；Cr：0.35%；
Cu：0.15%；Mo：0.10%；V：0.05%, surplus is to contain P and S in Fe and other inevitable impurity, impurity, described
P and S scope control should be P：＜ 0.035%；S：＜ 0.06%；
Step 2：Alloy melting
According to the element ratio in step one, then in electromagnetic induction furnace vacuum melting, by raw material 10# steel, ferrochrome, ferrosilicon
And the melting of pig iron heat temperature raising is to melting sources into molten steel, then into molten steel vanadium iron, molybdenum-iron, fine copper and ferromanganese are sequentially added, protected
Temperature is until the homogenization of composition added, is then cast into Ф 150mm ingot castings, and cast temperature is controlled at 1540 ± 10 DEG C, cast
The composition of ingot is the ingot casting of 7# compositions in table 2；
Step 3：Heating and thermal insulation is forged
The ingot casting obtained in step 2 is heated to after 1200 DEG C to be incubated 2h, then forged according to Ф 70mm size
Make, obtain Ф 70mm rod, room temperature is then cooled in atmosphere；
Step 4：Tempering
Gained Ф 70mm workpiece heats in step 3, to 2h is incubated after 200 DEG C, are finally given into the 7# high strength low-carbons of table 3
Martensite type workpiece, Ф 70mm workpiece can through hardening completely from surface to center portion.
Embodiment eight
Step one：Raw material proportioning
Steelmaking feed is chosen, steelmaking feed includes：Ferrochrome that amount containing Cr is 60%, the ferromanganese that amount containing Mn is 82.5%, contain
Vanadium iron and 10# steel, the pig iron and fine copper that ferrosilicon that Si amounts are 70%, the molybdenum-iron that amount containing Mo is 60%, V content are 50%, refining
Steel raw material selection amount is matched according to following gross mass number：C：0.22%；Si：2.5%；Mn：1.6%；Cr：0.70%；
Cu：0.30%；Mo：0.30%；V：0.12%, surplus is to contain P and S in Fe and other inevitable impurity, impurity, described
P and S scope control should be P：＜ 0.035%；S：＜ 0.06%；
Step 2：Alloy melting
According to the element ratio in step one, then in electromagnetic induction furnace vacuum melting, by raw material 10# steel, ferrochrome, ferrosilicon
And the melting of pig iron heat temperature raising is to melting sources into molten steel, then into molten steel vanadium iron, molybdenum-iron, fine copper and ferromanganese are sequentially added, protected
Temperature is until the homogenization of composition added, is then cast into Ф 150mm ingot castings, and cast temperature is controlled at 1570 ± 10 DEG C, cast
The composition of ingot is the ingot casting of 8# compositions in table 2；
Step 3：Heating and thermal insulation is forged
The ingot casting obtained in step 2 is heated to after 1200 DEG C to be incubated 2h, then forged according to Ф 70mm size
Make, obtain Ф 70mm pole, room temperature is then cooled in atmosphere；
Step 4：Tempering
Gained workpiece heat in step 3, to 2h is incubated after 200 DEG C, is finally given into the 8# high strength low-carbon martensites of table 3
Type workpiece, Ф 70mm workpiece can through hardening completely from surface to center portion.
The chemical composition composition (wt.%) of the automobile front axle non-hardened and tempered steel of table 2
The mechanical property of the front axle non-hardened and tempered steel of table 3
The low-carbon martensite type in the range of mentioned component it can be seen from the mechanical performance index in upper table and Fig. 4 is non-
Quenched and tempered steel has higher combination of strength and toughness：Rp0.2>=750MPa, Rm>=1050MPa, A >=14%, AkU≥70J。
Claims (2)
1. a kind of auto parts preparation method of low-carbon martensite non-hardened and tempered steel：It is characterised in that it includes following step：
Step one：Raw material proportioning
Steelmaking feed is chosen, steelmaking feed includes：Ferrochrome that amount containing Cr is 60%, the ferromanganese that amount containing Mn is 82.5%, si content
Vanadium iron, 10# steel, the pig iron and the fine copper for being 50% for 70% ferrosilicon, the molybdenum-iron that amount containing Mo is 60%, V content, steelmaking feed choosing
Taken amount is matched according to following gross mass number：Elements C：0.07%~0.22%；Si：1.1%~2.5%；Mn：1.2%
~2.5%；Cr：0.3%~1.2%；Cu：0.05%~0.4%；Mo：0.1%~0.3%；V：0.05%~0.15%；It is remaining
Measure as Fe and other inevitable impurity, P and S is contained in impurity, described P and S scope control should be P：＜
0.035%；S：＜ 0.06%；
Step 2：Alloy melting
The raw material got ready according to step one, first by raw material 10# steel, ferrochrome, ferrosilicon and the melting of pig iron heat temperature raising to melting sources
Vanadium iron, molybdenum-iron, fine copper and ferromanganese, insulation are sequentially added until the homogenization of composition added, is then poured into molten steel, then into molten steel
Ingot casting is cast, cast temperature is controlled at 1530~1580 DEG C, the element constituent for obtaining ingot casting is C：0.07~0.22；Si：
1.1~2.5；Mn：1.2~2.5；Cr：0.3~1.2；Cu：0.05~0.4；Mo：0.1~0.3；V：0.05~0.15；P：＜
0.035；S：＜ 0.06, surplus is Fe and other inevitable impurity；
Step 3：Heating and thermal insulation is forged
The ingot casting obtained in step 2 is heated to after 1100~1200 DEG C to be incubated 1~2h, is then forged or is rolled, obtained
The shape and size of required workpiece, are then cooled to room temperature in atmosphere；
Step 4：Tempering
Gained workpiece heat in step 3, to 2h is incubated after 200 DEG C, is finally given into predominantly low-carbon martensite type tissue, in addition
Also a small amount of granular bainite, the volume fraction of bainite is less than 30%, and its mechanical property is：Rp0.2>=750MPa, Rm≥
1050MPa, A >=14%, AkU≥70J；
(wt.%) is the component of finished product obtained by preparing by mass percentage：C：0.07%~0.22wt.%；Si：1.1%~
2.5%；Mn：1.2%~2.5%；Cr：0.3%~1.2%；Cu：0.05%~0.4%；Mo：0.1%~0.3%；V：
0.05%~0.15%；P：＜ 0.035%；S：＜ 0.06%, surplus is Fe.
2. a kind of preparation method of auto parts low-carbon martensite non-hardened and tempered steel according to claim 1, its feature exists
In melting carries out melting to melting sources into molten steel in electromagnetic induction furnace vacuum melting or conventional method in described step two.
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| CN108165891A (en) * | 2017-12-28 | 2018-06-15 | 北京北冶功能材料有限公司 | A kind of high-strength and high ductility of resistance to extreme environment low-carbon martensite cast steel and preparation method |
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| CN115287552B (en) * | 2022-08-17 | 2023-06-16 | 四川清贝科技技术开发有限公司 | Lightweight low-alloy steel casting, preparation method and application thereof |
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| EP2204463B8 (en) * | 2007-10-29 | 2019-08-14 | Nippon Steel Corporation | Martensite type steel not requiring heat treatment and hot forged non heat-treated steel parts |
| JP5857909B2 (en) * | 2012-08-09 | 2016-02-10 | 新日鐵住金株式会社 | Steel sheet and manufacturing method thereof |
| CN102943204A (en) * | 2012-11-28 | 2013-02-27 | 东北大学 | Yield strength 1100MPa level engineering machinery non-quenched and tempered hot rolled strip and preparation method thereof |
| JP5928374B2 (en) * | 2013-03-14 | 2016-06-01 | Ｊｆｅスチール株式会社 | Non-tempered low-yield ratio high-tensile steel plate and method for producing the same |
| CN104988425B (en) * | 2015-05-25 | 2017-03-08 | 西安交通大学 | A kind of ultrahigh-intensity high-toughness low-carbon martensite cast steel and preparation method thereof |
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| CN108165891A (en) * | 2017-12-28 | 2018-06-15 | 北京北冶功能材料有限公司 | A kind of high-strength and high ductility of resistance to extreme environment low-carbon martensite cast steel and preparation method |
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