CN104962840A - Steel for automotive engine expansion breaking connecting rod - Google Patents
Steel for automotive engine expansion breaking connecting rod Download PDFInfo
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- CN104962840A CN104962840A CN201510332645.XA CN201510332645A CN104962840A CN 104962840 A CN104962840 A CN 104962840A CN 201510332645 A CN201510332645 A CN 201510332645A CN 104962840 A CN104962840 A CN 104962840A
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Abstract
The invention belongs to the field of non-quenched and tempered steel, and relates to steel for an automotive engine expansion breaking connecting rod, in particular to phosphorus and sulfur contained high-strength steel suitable for the automotive engine expansion breaking connecting rod. The steel for the automotive engine expansion breaking connecting rod comprises the following chemical elements by mass percent: 0.40-0.50% of C, 0.60-0.80% of Si, 1.10-1.30% of Mn, 0.030-0.050% of P, 0.025-0.045% of S, 0.10-0.20% of Cr, 0.15-0.25% of V, 0.0150-0.0250% of N, and the balance being Fe and unavoidable impurities. The steel for the automotive engine expansion breaking connecting rod is characterized in that data of relevant mechanical property of the steel are as follows: Rel is greater than or equal to 800MPa, Rm is greater than or equal to 1100MPa, A is greater than or equal to 10%, and Z is greater than or equal to 20%. Through scientific design of an alloy system, the steel with high strength, appropriate brittleness and good machinability for the automotive engine expansion breaking connecting rod can be produced without making important adjustment to the existing production technique, and the technical effect is significant.
Description
Technical field
Motor car engine fractured connecting rod steel of the present invention, belongs to non-hardened and tempered steel field, is specifically related to phosphorous, the sulphur high-strength steel that are applicable to motor car engine fractured connecting rod.
Background technology
Disconnected processing technology that engine link is swollen is the state-of-the-art technology of connecting rod production in the world at present, grows up, and be applied to scale operation field gradually in nineteen nineties in automotive industry developed country.Compare with traditional Machining of Connecting Rod technology, disconnected processing technology that engine link is swollen has the unrivaled superiority of conventional linkage working method, and its manufacturing procedure is few, saving finish machining equipment, saving metal material and energy, production cost are low.
Along with connecting rod bulge-breaking process technology maturation and be applied to scale operation manufacture, adapt to the principal contradiction that the automobile connecting bar material of bulge-breaking process becomes bulge-breaking process application gradually.Fractured connecting rod material not only affects use properties and the machinability of connecting rod product, and determine can cracking behavior and cross section quality, plays a crucial role to bulge-breaking process.Therefore, fractured connecting rod material general requirement has higher intensity, less viscous deformation, suitable fragility and good machinability.Material at present for the swollen disconnected processing of connecting rod mainly contains C70S6 forged steel, SPLITASCO series forged steel, FRACTIM forged steel and S53CV-FS forged steel etc.C70S6 forged steel is the fractured connecting rod material of 20 century 70 Germany exploitation, and had 19 kinds of engine links to adopt at that time, the engine up to the present having kind more than 60 different adopts.C70S6 forged steel is a kind of high-carbon, low manganese steel, has excellent cracking performance, but through the actual discovery of a large amount of production, the processability of C70S6 is poor, and tool wear is very fast.The SPLITASCO series forged steel of France's exploitation mainly comprises SPLITASCO70, SPLITASCO50 and SPLITASCO38.SPLITASCO70 has the chemical composition similar with C70S6, but with the addition of more Si element, further increases the workability of material, and at present, SPLITASCO70 can be applied in the occasion that all C70S6 apply; The element sulphur of SPLITASCO50 is greater than 0.150%, and phosphoric is greater than 0.070%, and the processability of this material is better, for the production of series of small engine link; SPLITASCO38 has the chemical composition substantially identical with traditional connecting rod material 38MnS5, has good anti-fatigue performance, thus is widely used in the connecting rod forging of Light-duty Vehicle and motortruck engine.Its microstructure of FRACTIM forged steel developed by CES and Bromsgrove joint research and development is almost whole pearlitic textures.Compared with C70S6, in FRACTIM forged steel, improve the content of Mn and S, consequently reduce the content of C, it significantly improve the workability of FRACTIM.Japan, on the basis of traditional cracking connecting-rod forged steel JIS S50CVS1, replacing part Mn content by improving Si, V content in steel, have developed the S53CV-FS forged steel with good anti-fatigue performance, reaching 10 in cycle index
7time secondary, the safe range of stress of C70S6 is 350MPa, and the safe range of stress of S53CV-FS is 420MPa, improves 20% than the safe range of stress of C70S6, but its material cracking distortion is comparatively serious, have impact on assembly precision.The expert Mahle GmbH company of Germany's engine system and component develops novel link material 36MnVS4BY and 70MnVS4BY adopting bulge-breaking process, its fatigue property and processing characteristics are all due to C70S6 steel, but in swollen disconnected process, big end deflection is comparatively large, and process redundancy is large.
Patent " a kind of fractured connecting rod with in carbon non-hardened and tempered steel " (CN 101892424A) report a kind of fractured connecting rod making more than tensile strength 900MPa level with in carbon non-hardened and tempered steel, its metallographic structure is: ferrite+perlite.Compared with prior art, this steel not only plasticity is low, and swollen disconnected performance and fatigue property excellent, through forging and processing after, can be used to make fractured connecting rod, there is good economy; But containing certain Ti element in this steel, form the TiN phase of rhombus, affect the fatigue strength of connecting rod in Yi Gang, in addition, Al content high in steel is unfavorable for casting.
Document " exploitation of Automotive Fragmentation Connecting-Rod Steel " (Automobile Technology and Material, 2004) describe a kind of micro-alloyed steel for automobile connecting bar bulge-breaking process, and its chemical composition comprises (% by weight): C0.70%, Si0.22%, Mn0.50%, P0.010%, S0.063%.Be characterized in swollen disconnected excellent property, but intensity is less than 1000MPa, and cutting ability is not good.
Summary of the invention
The object of this invention is to provide a kind of motor car engine fractured connecting rod steel, by controlling the content of the carbon of swollen disconnected steel, silicon, manganese, phosphorus, sulphur, vanadium, nitrogen element, make this steel have high strength, inductile, suitable fragility and superior machinability, thus meet the fatigue of connection rod of automobile engine, the over-all properties requirement of swollen disconnected and machining aspect.
Technical solution of the present invention:
Motor car engine fractured connecting rod steel of the present invention, comprise: C, Si, Mn, P, S, Cr, V, N, Fe chemical element, the mass percent of its chemical element is: C:0.40 ~ 0.50%, Si:0.60 ~ 0.80%, Mn:1.10 ~ 1.30%, P:0.030 ~ 0.050%, S:0.025 ~ 0.045%, Cr:0.10 ~ 0.20%, V:0.15 ~ 0.25%, N:0.0150 ~ 0.0250%, and its surplus is iron and is inevitably mingled with; The relevant mechanical performance data of this connecting rod steel is: Rel >=800MPa, Rm >=1100MPa, A >=10%, Z >=20%, meets the over-all properties demand of connection rod of automobile engine fatigue, swollen disconnected and machining.
A kind of motor car engine fractured connecting rod steel according to technique scheme, the Chemical Composition of its mass percent is: C:0.46, Si:0.65, Mn:1.20, Cr:0.15, P:0.045, S:0.040, V:0.20, N:0.0200, and surplus is Fe and is inevitably mingled with; The mechanical property of its round steel bar is: Rel >=800MPa, Rm >=1100MPa, A >=10%, Z >=20%.
According to a motor car engine fractured connecting rod steel for technique scheme, the Chemical Composition of its mass percent is: C:0.42, Si:0.62, Mn:1.15, Cr:0.12, P:0.035, S:0.030, V:0.17, N:0.0160, its surplus are Fe and are inevitably mingled with; The mechanical property of its round steel bar is: Rel >=800MPa, Rm >=1100MPa, A >=10%, Z >=20%.
According to a motor car engine fractured connecting rod steel for technique scheme, the Chemical Composition of its mass percent is: C:0.40, Si:0.70, Mn:1.25, Cr:0.18, P:0.030, S:0.035, V:0.25, N:0.0250, its surplus are Fe and are inevitably mingled with; The mechanical property of its round steel bar is: Rel >=800MPa, Rm >=1100MPa, A >=10%, Z >=20%.
According to a motor car engine fractured connecting rod steel for technique scheme, the Chemical Composition of its mass percent is: C:0.44, Si:0.75, Mn:1.30, Cr:0.20, P:0.033, S:0.025, V:0.22, N:0.0220, its surplus are Fe and are inevitably mingled with; The mechanical property of its round steel bar is: Rel >=800MPa, Rm >=1100MPa, A >=10%, Z >=20%.
A kind of motor car engine fractured connecting rod steel according to technique scheme, the Chemical Composition of its mass percent is: C:0.50, Si:0.60, Mn:1.10, Cr:0.10, P:0.032, S:0.045, V:0.15, N:0.0150, and its surplus is Fe and is inevitably mingled with; The mechanical property of its round steel bar is: Rel >=800MPa, Rm >=1100MPa, A >=10%, Z >=20%.
According to a motor car engine fractured connecting rod steel for technique scheme, the Chemical Composition of its mass percent is: C:0.48, Si:0.80, Mn:1.22, Cr:0.16, P:0.050, S:0.042, V:0.18, N:0.0190, its surplus are Fe and are inevitably mingled with; The mechanical property of its round steel bar is: Rel >=800MPa, Rm >=1100MPa, A >=10%, Z >=20%.
The present invention starts with from the chemical composition of design fractured connecting rod steel, the pearlitic structure ratio of steel is made to reach 70-80%, its 20-30% ferrite is interrupted net distribution in steel, by adding V, N element, make in steel, to generate a large amount of precipitated phase, improve the intensity of steel, simultaneously, Xiang Gangzhong adds appropriate P, S element, while raising machinability, the fragility of suitable raising steel, be conducive to swollen disconnected processing, thus overcome prior art fractured connecting rod steel at fatigue property, the defect that the over-all properties that swollen disconnected performance and machinability aspect exist is not good, meet connection rod of automobile engine fatigue, swollen disconnected and machining over-all properties demand.
The chemical composition design of technical solution of the present invention is as follows:
C: the carbon content in non-hardened and tempered steel is the principal element of the final tissue of impact, too low carbon, and the pearlitic structure ratio in steel is less, and ferritic structure ratio is more, is unfavorable for forming interrupted ferrite network in steel, affects swollen disconnected performance; Meanwhile, too low carbon is also unfavorable for the intensity improving steel; But carbon content too high in steel can worsen the machinability of steel, therefore, carbon content is designed to 0.40-0.50%, can ensure that pearlitic structure ratio is 70-80%.
Si:Si does not form carbide in steel, can be solid-solution in ferrite the intensity and hardness that significantly improve steel.Therefore, in the steel of design, Si content is 0.60-0.80%.
Mn:Mn mainly exists with the form of solid solution in steel, has stronger solution strengthening effect, effectively can improve the intensity of steel.But content lower than 0.80% time, its strengthening effect is not obvious; Increasing Mn content in steel, by reducing the content of the eutectoid composition carbon of steel, causing increasing of either pearlite occurred, improve the intensity of steel; But when Mn content is more than 1.5% in steel, there is the effect promoting steel bainite.Therefore, in the steel of design, Mn content is 1.10-1.30%.
P:P is non-carbide forming element, and its existence form in steel mainly dissolves in ferrite.When ligancy is all 12, its atomic radius is 0.13nm, 0.003nm larger than iron atom, therefore can replace iron atom when it is dissolved in ferrite and form substitutional solid solution.In many substitutional solid solution forming elements, the solution strengthening ability of phosphorus is maximum, improves the intensity of steel; Meanwhile, P can reduce plasticity and the toughness of steel, improves the fragility of steel.Therefore, designing P content in steel is 0.030-0.050%.
S: add S element in steel, makes to form MnS inclusion in steel, when machining, cutting is easily disconnected, improves workpiece smooth finish; Meanwhile, ferrite, except separating out at original austenite crystal prevention, is also core is separated out with MnS, adds ferritic piece of number owing to adding core that ferrite formed, thus refinement Ferrite-Perlite structure, the S content therefore designed is 0.025-0.045%.
Cr:Cr is medium carbide forming element, dissolves in the hardening capacity that austenitic Cr improves steel strongly during heating; Cr dissolves in ferrite, produces solution strengthening, can improve ferritic intensity and hardness.Therefore, the Cr content of design is 0.10-0.20%.
V, N:V, N mainly strengthen precipitation strength effect and Grain refinement in steel, and N and V has very strong avidity, can form the gap phase of stabilizer pole.Nitride and carbide can dissolve mutually, form carbonitride, also can dissolve mutually between nitride, and form complex nitride, these compounds often exist with tiny particle, produce dispersion-strengthened effect, improve the intensity of steel.When adding nitrogen in V-alloyed steel, its precipitation strength effect significantly improves, and when N content is increased to 250 × 10-6 from 50 × 10-6, the yield strength of steel improves 100-150MPa, and namely the yield strength of the N raising steel of 10 × 10-6 is about 5MPa.V, N in steel, not still strengthening phase, can also suppress the migration of austenite grain boundary, fining austenite grains, thus fining ferrite grains and pearlite colony, when phase transformation, play the role of a nucleus again, make fetrite grain refinement further.But it is unfavorable that N content too high in steel is produced continuous casting, and easily form Cracks In Continuous Cast Billets, therefore, the N content of design is 0.0150-0.0250%, V content is 0.15-0.25%.
The technology of the present invention feature is the scientific design by alloy system, without the need to transforming any production unit, without the need to making Important Adjustment to existing production technique, just can produce the automobile fractured connecting rod steel with high strength, suitable fragility and good machinability, its mechanical performance data is: Rem >=1100MPa, Rel >=800MPa, A >=10%, Z >=20%.Be adapted to the bulge-breaking process of automobile connecting bar manufacture and the requirement of automotive light weight technology and security completely, obvious technical effects.
Embodiment
Now by the Chemical Composition of the present invention's 6 embodiment fractured connecting rod steel, and this embodiment of providing of table 1, table 2 and prior art motor car engine fractured connecting rod steel are the chemical composition of compared steel, mechanical property, impact property (room temperature) and fatigue property correlation data, fully show that motor car engine fractured connecting rod steel of the present invention has more excellent over-all properties, its Rem >=1100MPa, Rel >=800MPa, A >=10%, Z >=20%, is adapted to the bulge-breaking process of automobile connecting bar manufacture and the requirement of automotive light weight technology and security completely.
Embodiment 1
A kind of motor car engine fractured connecting rod of the present invention steel, the Chemical Composition of its mass percent is: C:0.46, Si:0.65, Mn:1.20, Cr:0.15, P:0.045, S:0.040, V:0.20, N:0.0200, and surplus is Fe and is inevitably mingled with; The mechanical property of its round steel bar is: Rel >=800MPa, Rm >=1100MPa, A >=10%, Z >=20%.
Embodiment 2
A kind of motor car engine fractured connecting rod of the present invention steel, the Chemical Composition of its mass percent is: C:0.42, Si:0.62, Mn:1.15, Cr:0.12, P:0.035, S:0.030, V:0.17, N:0.0160, its surplus are Fe and are inevitably mingled with; The mechanical property of its round steel bar is: Rel >=800MPa, Rm >=1100MPa, A >=10%, Z >=20%.
Embodiment 3
A kind of motor car engine fractured connecting rod of the present invention steel, the Chemical Composition of its mass percent is: C:0.40, Si:0.70, Mn:1.25, Cr:0.18, P:0.030, S:0.035, V:0.25, N:0.0250, its surplus are Fe and are inevitably mingled with; The mechanical property of its round steel bar is: Rel >=800MPa, Rm >=1100MPa, A >=10%, Z >=20%.
Embodiment 4
A kind of motor car engine fractured connecting rod of the present invention steel, the Chemical Composition of its mass percent is: C:0.44, Si:0.75, Mn:1.30, Cr:0.20, P:0.033, S:0.025, V:0.22, N:0.0220, its surplus are Fe and are inevitably mingled with; The mechanical property of its round steel bar is: Rel >=800MPa, Rm >=1100MPa, A >=10%, Z >=20%.
Embodiment 5
A kind of motor car engine fractured connecting rod of the present invention steel, the Chemical Composition of its mass percent is: C:0.50, Si:0.60, Mn:1.10, Cr:0.10, P:0.032, S:0.045, V:0.15, N:0.0150, and its surplus is Fe and is inevitably mingled with; The mechanical property of its round steel bar is: Rel >=800MPa, Rm >=1100MPa, A >=10%, Z >=20%.
Embodiment 6
A kind of motor car engine fractured connecting rod of the present invention steel, the Chemical Composition of its mass percent is: C:0.48, Si:0.80, Mn:1.22, Cr:0.16, P:0.050, S:0.042, V:0.18, N:0.0190, its surplus are Fe and are inevitably mingled with; The mechanical property of its round steel bar is: Rel >=800MPa, Rm >=1100MPa, A >=10%, Z >=20%.
The chemical composition (, except listed Chemical Composition, its surplus is Fe and is inevitably mingled with for each embodiment steel and compared steel) of table 1 embodiment of the present invention 1-6 connecting rod steel and compared steel
| Embodiment | C | Si | Mn | Cr | P | S | V | N |
| 1 | 0.46 | 0.65 | 1.20 | 0.15 | 0.045 | 0.040 | 0.20 | 0.0200 |
| 2 | 0.42 | 0.62 | 1.15 | 0.12 | 0.035 | 0.030 | 0.17 | 0.0160 |
| 3 | 0.40 | 0.70 | 1.25 | 0.18 | 0.030 | 0.035 | 0.25 | 0.0250 |
| 4 | 0.44 | 0.75 | 1.30 | 0.20 | 0.033 | 0.025 | 0.22 | 0.0220 |
| 5 | 0.50 | 0.60 | 1.10 | 0.10 | 0.032 | 0.045 | 0.15 | 0.0150 |
| 6 | 0.48 | 0.80 | 1.22 | 0.16 | 0.050 | 0.042 | 0.18 | 0.0190 |
| Compared steel C70S6 | 0.70 | 0.20 | 0.56 | 0.12 | 0.010 | 0.065 | 0.03 | 0.0125 |
| Compared steel 36MnVS4 | 0.36 | 0.65 | 1.00 | 0.22 | 0.015 | 0.035 | 0.30 | 0.0160 |
| Compared steel S53CV-FS | 0.53 | 1.25 | 0.28 | / | 0.030 | / | 0.12 | 0.0045 |
| Compared steel SPLITASCO50 | 0.50 | 0.65 | 1.60 | / | 0.070 | 0.160 | / | / |
The relevant mechanical performance data of table 1 embodiment connecting rod steel and compared steel pressed by table 2
| Embodiment | Rel/MPa | Rm/MPa | A/％ | Z/％ | A ku2/J | σ -1/MPa |
| 1 | 820 | 1120 | 12 | 25 | 30 | 435 |
| 2 | 800 | 1100 | 16 | 30 | 31 | 420 |
| 3 | 805 | 1110 | 17 | 30 | 29 | 422 |
| 4 | 825 | 1130 | 12 | 26 | 30 | 418 |
| 5 | 830 | 1150 | 11 | 23 | 28 | 430 |
| 6 | 825 | 1155 | 11 | 22 | 27 | 415 |
| Compared steel C70S6 | 550 | 950 | 10 | 20 | 10 | 320 |
| Compared steel 36MnVS4 | 750 | 1000 | 20 | 40 | 35 | 400 |
| Compared steel S53CV-FS | 621 | 883 | / | / | 40 | 420 |
| Compared steel SPLITASCO50 | 575 | 654 | / | / | 4 | 330 |
Claims (7)
1. motor car engine fractured connecting rod steel, comprise: C, Si, Mn, P, S, Cr, V, N, Fe chemical element, it is characterized in that, the mass percent of its chemical element is: C:0.40 ~ 0.50%, Si:0.60 ~ 0.80%, Mn:1.10 ~ 1.30%, P:0.030 ~ 0.050%, S:0.025 ~ 0.045%, Cr:0.10 ~ 0.20%, V:0.15 ~ 0.25%, N:0.0150 ~ 0.0250%, and its surplus is iron and is inevitably mingled with; The relevant mechanical performance data of this connecting rod steel is: Rel >=800MPa, Rm >=1100MPa, A >=10%, Z >=20%, meets the over-all properties demand of connection rod of automobile engine fatigue, swollen disconnected and machining.
2. a motor car engine fractured connecting rod steel according to claim 1, it is characterized in that, the Chemical Composition of its mass percent is C:0.46, Si:0.65, Mn:1.20, Cr:0.15, P:0.045, S:0.040, V:0.20, N:0.0200, and its surplus is Fe and is inevitably mingled with; The mechanical property of its round steel bar is: Rel >=800MPa, Rm >=1100MPa, A >=10%, Z >=20%.
3. a motor car engine fractured connecting rod steel according to claim 1, it is characterized in that, the chemical composition of its mass percent is C:0.42, Si:0.62, Mn:1.15, Cr:0.12, P:0.035, S:0.030, V:0.17, N:0.0160, its surplus be Fe and be inevitably mingled with; The mechanical property of its round steel bar is: Rel >=800MPa, Rm >=1100MPa, A >=10%, Z >=20%.
4. a motor car engine fractured connecting rod steel according to claim 1, it is characterized in that, the chemical composition of its mass percent is C:0.40, Si:0.70, Mn:1.25, Cr:0.18, P:0.030, S:0.035, V:0.25, N:0.0250, its surplus be Fe and be inevitably mingled with; The mechanical property of its round steel bar is: Rel >=800MPa, Rm >=1100MPa, A >=10%, Z >=20%.
5. a motor car engine fractured connecting rod steel according to claim 1, it is characterized in that, the chemical composition of its mass percent is C:0.44, Si:0.75, Mn:1.30, Cr:0.20, P:0.033, S:0.025, V:0.22, N:0.0220, its surplus be Fe and be inevitably mingled with; The mechanical property of its round steel bar is: Rel >=800MPa, Rm >=1100MPa, A >=10%, Z >=20%.The mechanical property of its round steel bar is: Rel >=800MPa, Rm >=1100MPa, A >=10%, Z >=20%.
6. a motor car engine fractured connecting rod steel according to claim 1, it is characterized in that, the chemical composition of its mass percent is C:0.50, Si:0.60, Mn:1.10, Cr:0.10, P:0.032, S:0.045, V:0.15, N:0.0150, and its surplus is Fe and is inevitably mingled with; The mechanical property of its round steel bar is: Rel >=800MPa, Rm >=1100MPa, A >=10%, Z >=20%.
7. a motor car engine fractured connecting rod steel according to claim 1, it is characterized in that, the chemical composition of its mass percent is C:0.48, Si:0.80, Mn:1.22, Cr:0.16, P:0.050, S:0.042, V:0.18, N:0.0190, its surplus be Fe and be inevitably mingled with; The mechanical property of its round steel bar is: Rel >=800MPa, Rm >=1100MPa, A >=10%, Z >=20%.
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| CN105463318A (en) * | 2015-11-27 | 2016-04-06 | 北大方正集团有限公司 | Non-quenched and non-tempered steel, production method of non-quenched and non-tempered steel and cracking connecting rod manufactured through non-quenched and non-tempered steel |
| CN107201483A (en) * | 2017-05-03 | 2017-09-26 | 中国第汽车股份有限公司 | A kind of high intensity non-hardened and tempered steel material suitable for connecting rod |
| CN108504934A (en) * | 2018-05-11 | 2018-09-07 | 攀钢集团攀枝花钢铁研究院有限公司 | Containing V, Nb, N Micro Alloying pre-hardened plastic mold steel and preparation method thereof |
| CN109763061A (en) * | 2017-11-09 | 2019-05-17 | 苏州苏信特钢有限公司 | A kind of non-hardened and tempered steel and preparation method thereof |
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| CN102644038A (en) * | 2012-04-23 | 2012-08-22 | 武汉钢铁(集团)公司 | Production method of steel for automobile connecting rods |
| CN104630658A (en) * | 2015-01-23 | 2015-05-20 | 上海大学 | Fine crystal non-quenched and tempered steel for connecting rod |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105463318A (en) * | 2015-11-27 | 2016-04-06 | 北大方正集团有限公司 | Non-quenched and non-tempered steel, production method of non-quenched and non-tempered steel and cracking connecting rod manufactured through non-quenched and non-tempered steel |
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| CN107201483A (en) * | 2017-05-03 | 2017-09-26 | 中国第汽车股份有限公司 | A kind of high intensity non-hardened and tempered steel material suitable for connecting rod |
| CN109763061A (en) * | 2017-11-09 | 2019-05-17 | 苏州苏信特钢有限公司 | A kind of non-hardened and tempered steel and preparation method thereof |
| CN109763061B (en) * | 2017-11-09 | 2021-10-22 | 苏州苏信特钢有限公司 | Non-quenched and tempered steel and preparation method thereof |
| CN108504934A (en) * | 2018-05-11 | 2018-09-07 | 攀钢集团攀枝花钢铁研究院有限公司 | Containing V, Nb, N Micro Alloying pre-hardened plastic mold steel and preparation method thereof |
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