CN104046921A - Oversized-section bainite pre-hardening plastic die steel and manufacturing method - Google Patents

Oversized-section bainite pre-hardening plastic die steel and manufacturing method Download PDF

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CN104046921A
CN104046921A CN201410171834.9A CN201410171834A CN104046921A CN 104046921 A CN104046921 A CN 104046921A CN 201410171834 A CN201410171834 A CN 201410171834A CN 104046921 A CN104046921 A CN 104046921A
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steel
temperature
super
plastic mould
forging
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CN201410171834.9A
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CN104046921B (en
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周青春
徐卫明
吴晓春
顾金才
钱强
王小飞
丁勇
刘鑫
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如皋市宏茂重型锻压有限公司
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Abstract

The invention relates to a low-cost oversized-section bainite pre-hardening plastic die steel and its manufacturing method and belongs to the technical field of an alloy steel manufacturing technology. The steel is characterized in that main alloy elements in alloy chemical components comprise, by weight, 0.15-0.30% of C, 0.10-0.30% of Si, 2.00-3.00% of Mn, 1.00-2.00% of Cr, 0.10-0.30% of Mo, 0.10-0.30% of V, P being less than 0.03%, S being less than 0.03%, 0.10-0.30% of Ni, Nb being less than or equal to 0.15%, and the balance Fe. The manufacturing process of the steel comprises steps as follows: burdening, smelting, casting and hot charging; heat treatment by high-temperature heat diffusion, hot working by multi-directional forging, and controlled cooling after forging; and heat treatment by tempering. The steel provided by the invention has advantages of short period, low cost, high hardenability, high uniformity of hardness and dermatoglyph etching performance.

Description

Super-section Pre-Bainitic sclerosis plastic mould steel and preparation method thereof
Technical field
The present invention relates to a kind of plastic mould steel, be specifically related to a kind of low cost super-section Pre-Bainitic sclerosis plastic mould steel, also relate to the manufacturing process of preparing this plastic mould steel, belong to steel alloy technical field.
Background technology
The large-sized plastic rubber mould using is at present mainly 718 die steel of American Standard and 1.2738 die steel of Europe superscript, these die steel are mainly used for manufacturing bumper mould and some large-scale household electrical appliances moulds, and wherein nerf bar die size reaches 2300mm × 1800mm × 800mm.This just requires moulding stock to have higher hardening capacity and uniformity of hardness.Therefore, 718 or 1.2738 die steel of the main dependence on import of this class die steel.This uses business's use cost and the manufacturing cost of related products by greatly increasing mould.
Along with the fast development of China's mold manufacturing industry and improving constantly of die steel production level, at present China can successfully produce heavy in section 718 and 1.2738 die steel, and at the bumper of part type with being applied on mould.But, higher for the manufacturing cost of 718 or 1.2738 die steel, and the manufacturing cycle is long, and this uses business to bring huge pressure to mould.Particularly at the bottom of the global economy since 2012, be confused under environment, economizing on resources and reducing costs is a large bottleneck of automobile industry.
Summary of the invention
The object of the present invention is to provide a kind of low cost super-section Pre-Bainitic sclerosis plastic mould steel, there is higher hardening capacity and uniformity of hardness, be applicable to manufacture bumper mould and some large-scale household electrical appliances moulds.
For solving the problems of the technologies described above, the present invention adopts following technical scheme to realize: super-section Pre-Bainitic sclerosis plastic mould steel, its innovative point is: in the chemical composition of described steel, the mass percent of each alloying element is: C is 0.25~0.40%, Si is 0.10~0.30%, Mn is 2.00~3.00%, Cr is 1.00~2.00%, Mo is 0.10~0.30%, V is 0.10~0.30%, P < 0.03%, S < 0.03%, Ni is 0.10~0.30%, Nb≤0.15%, Fe surplus.
Preferably, in the chemical composition of described steel, the mass percent of each alloying element is: in the chemical composition of described steel, the mass percent of each alloying element is: C is that 0.28%, Si is that 0.20%, Mn is 2.30%, Cr is 1.30%, Mo is that 0.20%, V is 0.20%, P < 0.020%, S < 0.015%, Ni is that 0.20%, Nb is 0.08%, Fe surplus.
The present invention reduces the content of Mo on 718 basis, greatly reduce and even do not use Ni element, increase substantially the content of Mn element, thereby greatly reduce the cost of alloy of this steel, be that steel per ton reduces approximately 1000 yuan of cost of alloy, the nerf bar mould that is equivalent to 30 tons of pairs is saved cost of alloy more than approximately 30,000 yuan.
The preparation method who another object of the present invention is to provide a kind of super-section Pre-Bainitic sclerosis plastic mould steel, comprises smelting, High temperature diffusion thermal treatment, forges hot-work, forges rear pre-hardening processing and tempering heat treatment operation, and concrete steps are as follows:
(1) smelt: by the chemical composition of super above-mentioned large section Pre-Bainitic sclerosis plastic mould steel and weight percent for preparing burden, electric arc furnace smelting and refining, then carry out vacuum outgas and casting, then heat is sent forge furnace;
(2) High temperature diffusion thermal treatment: Heating temperature is 1150~1250 DEG C, soaking time is 15~20h;
(3) forge hot-work: will be cooled in 950~1200 DEG C of temperature ranges and carry out multiway forging processing through the heat treated steel ingot of High temperature diffusion, and adopt two upsettings two to pull out forging mode, and always forge compression ratio >=3, final forging temperature >=850 DEG C;
(4) forge after pre-hardening processing: after forging, adopt water-cooled or mist cold, cooling fast to be greater than the speed of 0.015 DEG C/s, drop to 200 DEG C to temperature and reinstall below fiery process furnace;
(5) tempering heat treatment: be heated to 450~600 DEG C, be incubated after 20~40 hours cooling rate≤30 DEG C/h and be chilled to below 250 DEG C, the air cooling of coming out of the stove.
Further, described High temperature diffusion thermal treatment, point stepped heating in steel ingot temperature-rise period, ensures that steel ingot internal and external temperature is even, respectively at 600 DEG C, 800 DEG C and 1100 DEG C of isothermals; After High temperature diffusion thermal treatment, at 950~1200 DEG C of temperature isothermals, after steel ingot temperature is even, carry out conducting forging processing.
Pre-hardening processing after described forging, adopts air-cooled after forging or mist is cold or water-cooled to 200 DEG C, temper immediately, temper 2 times, 450~600 DEG C of each tempering temperatures, each tempering insulation time 15~20h.
Steel grade of the present invention is not or contain lower Ni content, thereby do not have a white point problem, so saved long expansion hydrogen heat treatment step in manufacturing processed, greatly shorten the manufacturing cycle (shortening approximately 7 day time) so on the one hand, reduce on the other hand manufacturing cost (steel per ton reduce about 800-1000 unit).
In addition, steel grade of the present invention is due to the Mn element of high level, and there is higher hardening capacity, in manufacturing processed, do not need to adopt modified (quenching+tempering) treatment process to carry out pre-hardening as 718 or 1.2738 steel, but can utilize forging preheating, laggard sector-style is cold or mist is cold or the mode such as water-cooled reaches prevulcanized object forging.Therefore, this on the one hand shortens the manufacturing cycle (shortening approximately 6 day time), reduces on the other hand manufacturing cost (steel per ton reduce about 1200-1500 unit).
Beneficial effect of the present invention: compared with 718 or 1.2738 steel, steel grade of the present invention shortens about 13-15 days of manufacturing cycle, and steel per ton reduces the about 3000-3500 of manufacturing cost unit.This brings huge contribution for China's manufacturing industry especially automobile industry, and improves China's die steel manufacture level and the market competitiveness.
Brief description of the drawings
Fig. 1 is the super-section Pre-Bainitic hardening die steel CCT curve of embodiment 1.
Fig. 2 is the metallographic structure of the super-section Pre-Bainitic sclerosis plastic mould steel of embodiment 1.
Fig. 3 is that the super-section Pre-Bainitic sclerosis plastic mould steel head section hardness of embodiment 1 distributes.
The super-section Pre-Bainitic sclerosis plastic mould steel afterbody section hardness of Fig. 4 embodiment 1 distributes.
Fig. 5 is the super-section Pre-Bainitic sclerosis plastic mould sheetmetal line etching case of embodiment 1.
Fig. 6 is the super-section Pre-Bainitic hardening die steel CCT curve of embodiment 2.
Fig. 7 is the metallographic structure of the super-section Pre-Bainitic sclerosis plastic mould steel of embodiment 2.
Fig. 8 is that the head section hardness of the super-section Pre-Bainitic sclerosis plastic mould steel of embodiment 2 distributes.
The afterbody section hardness of the super-section Pre-Bainitic sclerosis plastic mould steel of Fig. 9 embodiment 2 distributes.
Figure 10 is the super-section Pre-Bainitic sclerosis plastic mould sheetmetal line etching case of embodiment 2.
Figure 11 is the super-section Pre-Bainitic hardening die steel CCT curve of embodiment 3.
Figure 12 is the metallographic structure of the super-section Pre-Bainitic sclerosis plastic mould steel of embodiment 3.
Figure 13 is that the head section hardness of the super-section Pre-Bainitic sclerosis plastic mould steel of embodiment 3 distributes.
Figure 14 is that the afterbody section hardness of the super-section Pre-Bainitic sclerosis plastic mould steel of embodiment 3 distributes.
Figure 15 is the super-section Pre-Bainitic sclerosis plastic mould sheetmetal line etching case of embodiment 3.
Figure 16 is the pre-hardening die steel CCT curve of comparative example 1.
Figure 17 is the metallographic structure of the pre-hardening plastic mould steel of comparative example 1.
Figure 18 is that the head section hardness of the pre-hardening plastic mould steel of comparative example 1 distributes.
Figure 19 is that the afterbody section hardness of the pre-hardening plastic mould steel of comparative example 1 distributes.
Figure 20 is the pre-hardening plastic mould sheetmetal line etching case of comparative example 1.
Figure 21 is the pre-hardening die steel CCT curve of comparative example 2.
Figure 22 is the metallographic structure of the pre-hardening plastic mould steel of comparative example 2.
Figure 23 is that the head section hardness of the pre-hardening plastic mould steel of comparative example 2 distributes.
Figure 24 is that the afterbody section hardness of the pre-hardening plastic mould steel of comparative example 2 distributes.
Figure 25 is the pre-hardening plastic mould sheetmetal line etching case of comparative example 2.
Embodiment
Below in conjunction with specific embodiment, technical scheme of the present invention is elaborated.
Embodiment 1
Adopt moiety and the weight percent thereof of hot-work die steel as follows:
C is that 0.28%, Si is that 0.20%, Mn is that 2.30%, Cr is that 1.30%, Mo is 0.20%,
V is that 0.20%, P is that 0.020%, S is that 0.015%, Ni is that 0.20%, Nb is 0.08%, Fe surplus.
Technological process and the step of super-section Pre-Bainitic sclerosis plastic mould steel are as follows:
1) electrosmelting: smelt in electric arc furnace by above-mentioned alloying element proportioning, then external refining and vacuum outgas, is cast into steel ingot after heat and send forge furnace;
2) High temperature diffusion thermal treatment: Heating temperature is 1200~1250 DEG C, soaking time is 15~20h;
3) forge hot-work: will be cooled in 1150~1200 DEG C of temperature ranges and carry out multiway forging processing through the heat treated steel ingot of High temperature diffusion, and adopt two upsettings two to pull out forging mode, and always forge compression ratio >=3, final forging temperature >=850 DEG C;
4) forge rear pre-hardening processing: the rear employing of forging is air-cooled or mist is cold or water-cooled, ensure steel acquisition bainite structure, drop to 200 DEG C to temperature and reinstall below fiery process furnace;
5) tempering heat treatment: be heated to 500~550 DEG C, temper twice, is incubated stove after 20~30 hours and is chilled to below 250 DEG C, the air cooling of coming out of the stove.
The present embodiment super-section Pre-Bainitic hardening die steel is after above-mentioned smelting and hot-work and thermal treatment, and final finished specification is (long × wide × thick) 2500mm × 1300mm × 1200mm module, and performance test is carried out in sampling:
A phase-change characteristic:
The CCT curve of the present embodiment steel as shown in Figure 1.
B microstructure:
The microstructure of the present embodiment steel as shown in Figure 2.
The test of C uniformity of hardness:
The section hardness test result of the present embodiment steel as shown in Figure 3.As seen from the figure, this steel has higher uniformity of hardness, and the fluctuation of whole section hardness is within the scope of ± 1.5HRC.
D dermatoglyph etching performance:
The dermatoglyph etching case of the present embodiment as shown in Figure 4.As seen from the figure, this steel has good dermatoglyph etching performance.
Embodiment 2
Adopt moiety and the weight percent thereof of hot-work die steel as follows:
C is that 0.15%, Si is that 0.10%, Mn is that 3.00%, Cr is that 1.00%, Mo is 0.30%,
V is that 0.10%, P is that 0.015%, S is that 0.025%, Ni is that 0.10%, Nb is 0.14%, Fe surplus.
The preparation method of the present embodiment super-section Pre-Bainitic sclerosis plastic mould steel is with embodiment 1, and wherein tempering is heated to 450~500 DEG C.
The present embodiment super-section Pre-Bainitic hardening die steel is after above-mentioned smelting and hot-work and thermal treatment, and final finished specification is (long × wide × thick) 2500mm × 1300mm × 1200mm module, and performance test is carried out in sampling:
A phase-change characteristic:
The CCT curve of the present embodiment steel as shown in Figure 5.
B microstructure:
The microstructure of the present embodiment steel as shown in Figure 6.
The test of C uniformity of hardness:
The section hardness test result of the present embodiment steel as shown in Figure 7.As seen from the figure, change steel and have higher uniformity of hardness, the fluctuation of whole section hardness is within the scope of ± 1.5HRC.
D dermatoglyph etching performance:
The dermatoglyph etching case of the present embodiment as shown in Figure 8.As seen from the figure, this steel has good dermatoglyph etching performance.
Embodiment 3
Adopt moiety and the weight percent thereof of hot-work die steel as follows:
C is that 0.30%, Si is that 0.30%, Mn is that 2.00%, Cr is that 2.00%, Mo is 0.10%,
V is that 0.30%, P is that 0.03%, S is that 0.03%, Ni is that 0.30%, Nb is 0.10%, Fe surplus.
The preparation method of the present embodiment super-section Pre-Bainitic sclerosis plastic mould steel is with embodiment 1.
The present embodiment super-section Pre-Bainitic hardening die steel is after above-mentioned smelting and hot-work and thermal treatment, and final finished specification is (long × wide × thick) 2500mm × 1300mm × 1200mm module, and performance test is carried out in sampling:
A phase-change characteristic:
The CCT curve of the present embodiment steel as shown in Figure 9.
B microstructure:
The microstructure of the present embodiment steel as shown in Figure 10.
The test of C uniformity of hardness:
The section hardness test result of the present embodiment steel as shown in Figure 11.As seen from the figure, change steel and have higher uniformity of hardness, the fluctuation of whole section hardness is within the scope of ± 1.5HRC.
D dermatoglyph etching performance:
The dermatoglyph etching case of the present embodiment as shown in Figure 12.As seen from the figure, this steel has good dermatoglyph etching performance.
comparative example 1
718 moietys and weight percent thereof are as follows:
C is that 0.37, Si is that 0.30, Mn is that 1.40, Cr is that 2.00, Mo is that 0.20, P is that 0.020, S is that 0.003, Ni is 1.00, Fe surplus.
The preparation of employing ordinary method, trimmed size is (long × wide × thick) 2500mm × 1300mm × 1200mm module, performance test is carried out in sampling:
A phase-change characteristic:
The CCT curve of the present embodiment steel as shown in Figure 13.
B microstructure:
The microstructure of the present embodiment steel as shown in Figure 14.
The test of C uniformity of hardness:
The section hardness test result of the present embodiment steel as shown in Figure 15.As seen from the figure, change steel and have higher uniformity of hardness, the fluctuation of whole section hardness is within the scope of ± 2HRC.
D dermatoglyph etching performance:
The dermatoglyph etching case of the present embodiment as shown in Figure 16.As seen from the figure, this steel has good dermatoglyph etching performance.
comparative example 2
1.2738 moietys and weight percent thereof are as follows:
C is that 0.36, Si is that 0.30, Mn is that 1.50, Cr is that 2.00, Mo is that 0.20, P is that 0.020, S is that 0.003, Ni is 1.00, Fe surplus.
The preparation of employing ordinary method, trimmed size is (long × wide × thick) 2500mm × 1300mm × 1200mm module, performance test is carried out in sampling:
A phase-change characteristic:
The CCT curve of the present embodiment steel as shown in Figure 17.
B microstructure:
The microstructure of the present embodiment steel as shown in Figure 18.
The test of C uniformity of hardness:
The section hardness test result of the present embodiment steel as shown in Figure 19.As seen from the figure, change steel and have higher uniformity of hardness, the fluctuation of whole section hardness is within the scope of ± 3HRC.
D dermatoglyph etching performance:
The dermatoglyph etching case of the present embodiment as shown in Figure 20.As seen from the figure, this steel has good dermatoglyph etching performance.
Table 1 be steel grade of the present invention and comparative example steel grade Performance Ratio
? Embodiment 1 Embodiment 2 Embodiment 3 Comparative example 1 Comparative example 2
Hardening capacity Excellent Excellent Excellent Good Generally
Uniformity of hardness ±1.5HRC ±1.5HRC ±1.5HRC ±2HRC ±3HRC
Dermatoglyph etching Excellent Excellent Excellent Good Generally

Claims (5)

1. super-section Pre-Bainitic sclerosis plastic mould steel, it is characterized in that: in the chemical composition of described steel, the mass percent of each alloying element is: C is that 0.25~0.40%, Si is that 0.10~0.30%, Mn is 2.00~3.00%, Cr is 1.00~2.00%, Mo is that 0.10~0.30%, V is 0.10~0.30%, P < 0.03%, S < 0.03%, Ni is 0.10~0.30%, Nb≤0.15%, Fe surplus.
2. super-section Pre-Bainitic sclerosis plastic mould steel according to claim 1, it is characterized in that: in the chemical composition of described steel, the mass percent of each alloying element is: C is that 0.28%, Si is that 0.20%, Mn is 2.30%, Cr is 1.30%, Mo is that 0.20%, V is 0.20%, P < 0.020%, S < 0.015%, Ni is that 0.20%, Nb is 0.08%, Fe surplus.
3. a preparation method who realizes the super-section Pre-Bainitic sclerosis plastic mould steel of claim 1, is characterized in that: comprise smelting, High temperature diffusion thermal treatment, forge hot-work, forge rear pre-hardening processing and tempering heat treatment operation, concrete steps are as follows:
(1) smelt: by the chemical composition of super above-mentioned large section Pre-Bainitic sclerosis plastic mould steel and weight percent for preparing burden, electric arc furnace smelting and refining, then carry out vacuum outgas and casting, then heat is sent forge furnace;
(2) High temperature diffusion thermal treatment: Heating temperature is 1150~1250 DEG C, soaking time is 15~20h;
(3) forge hot-work: will be cooled in 950~1200 DEG C of temperature ranges and carry out multiway forging processing through the heat treated steel ingot of High temperature diffusion, and adopt two upsettings two to pull out forging mode, and always forge compression ratio >=3, final forging temperature >=850 DEG C;
(4) forge after pre-hardening processing: after forging, adopt water-cooled or mist cold, cooling fast to be greater than the speed of 0.015 DEG C/s, drop to 200 DEG C to temperature and reinstall below fiery process furnace;
(5) tempering heat treatment: be heated to 450~600 DEG C, be incubated after 20~40 hours cooling rate≤30 DEG C/h and be chilled to below 250 DEG C, the air cooling of coming out of the stove.
4. the preparation method of super-section Pre-Bainitic sclerosis plastic mould steel according to claim 3, is characterized in that: described High temperature diffusion thermal treatment, adopts stepped heating, respectively 600 DEG C, 800 DEG C and 1100 DEG C of isothermal processes; After High temperature diffusion thermal treatment, at 950~1200 DEG C of temperature isothermals, after steel ingot temperature is even, carry out conducting forging processing.
5. the preparation method of super-section Pre-Bainitic sclerosis plastic mould steel according to claim 3, it is characterized in that: described temper operation temper 2 times, temper time-temperature is 450~600 DEG C, and the temper time is respectively 15~20h.
CN201410171834.9A 2014-04-28 2014-04-28 Super-section Pre-Bainitic sclerosis plastic mould steel and preparation method thereof CN104046921B (en)

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CN105177438A (en) * 2015-10-15 2015-12-23 芜湖市宝艺游乐科技设备有限公司 High-plasticity corrosion-resistant temperature-resistant pre-hardening plastic die steel and preparation method thereof
CN105200344A (en) * 2015-10-15 2015-12-30 芜湖市宝艺游乐科技设备有限公司 Easy-to-demould, high-hardness and pre-hardened plastic mould steel, and preparation method thereof
CN105200343A (en) * 2015-10-15 2015-12-30 芜湖市宝艺游乐科技设备有限公司 Pre-hardened plastic die steel having high acid corrosion resistance and preparation method thereof
CN105200347A (en) * 2015-10-15 2015-12-30 芜湖市宝艺游乐科技设备有限公司 Pre-hardened plastic die steel having high strength, easy plasticity and corrosion resistance and preparation method thereof
CN105200342A (en) * 2015-10-15 2015-12-30 芜湖市宝艺游乐科技设备有限公司 Pre-hardened plastic die steel having high toughness and halogen corrosion resistance and preparation method thereof
CN105200326A (en) * 2015-10-15 2015-12-30 芜湖市宝艺游乐科技设备有限公司 Pre-hardened plastic die steel having high abrasion resistance and preparation method thereof
CN105200319A (en) * 2015-10-15 2015-12-30 芜湖市宝艺游乐科技设备有限公司 Light highly-thermal-fatigue-resistant pre-hardened plastic die steel and preparation method thereof
CN105200331A (en) * 2015-10-15 2015-12-30 芜湖市宝艺游乐科技设备有限公司 High-temperature steam corrosion resistant pre-hardened plastic die steel and preparation method thereof
CN105274437A (en) * 2015-10-08 2016-01-27 如皋市宏茂重型锻压有限公司 Thermal fatigue resisting and high performance hot working die steel and manufacturing process thereof
CN105274448A (en) * 2015-10-08 2016-01-27 如皋市宏茂重型锻压有限公司 Highly polished pre-hardening plastic die steel and manufacturing process thereof
CN105586530A (en) * 2015-04-04 2016-05-18 王文姣 Vehicle bumper and manufacturing method thereof
CN105861942A (en) * 2016-05-13 2016-08-17 如皋市宏茂重型锻压有限公司 Cold work die steel and preparation process thereof
CN109825688A (en) * 2019-03-06 2019-05-31 江苏品模信息科技有限公司 Heat processing technique for P20 and 718 plastic die steels
CN111041373A (en) * 2020-01-02 2020-04-21 中煤张家口煤矿机械有限责任公司 Medium Mn steel for chain wheel and preparation method and application thereof

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CN105586530A (en) * 2015-04-04 2016-05-18 王文姣 Vehicle bumper and manufacturing method thereof
CN105274437A (en) * 2015-10-08 2016-01-27 如皋市宏茂重型锻压有限公司 Thermal fatigue resisting and high performance hot working die steel and manufacturing process thereof
CN105274448A (en) * 2015-10-08 2016-01-27 如皋市宏茂重型锻压有限公司 Highly polished pre-hardening plastic die steel and manufacturing process thereof
CN105177438A (en) * 2015-10-15 2015-12-23 芜湖市宝艺游乐科技设备有限公司 High-plasticity corrosion-resistant temperature-resistant pre-hardening plastic die steel and preparation method thereof
CN105200342A (en) * 2015-10-15 2015-12-30 芜湖市宝艺游乐科技设备有限公司 Pre-hardened plastic die steel having high toughness and halogen corrosion resistance and preparation method thereof
CN105200326A (en) * 2015-10-15 2015-12-30 芜湖市宝艺游乐科技设备有限公司 Pre-hardened plastic die steel having high abrasion resistance and preparation method thereof
CN105200319A (en) * 2015-10-15 2015-12-30 芜湖市宝艺游乐科技设备有限公司 Light highly-thermal-fatigue-resistant pre-hardened plastic die steel and preparation method thereof
CN105200331A (en) * 2015-10-15 2015-12-30 芜湖市宝艺游乐科技设备有限公司 High-temperature steam corrosion resistant pre-hardened plastic die steel and preparation method thereof
CN105200347A (en) * 2015-10-15 2015-12-30 芜湖市宝艺游乐科技设备有限公司 Pre-hardened plastic die steel having high strength, easy plasticity and corrosion resistance and preparation method thereof
CN105200343A (en) * 2015-10-15 2015-12-30 芜湖市宝艺游乐科技设备有限公司 Pre-hardened plastic die steel having high acid corrosion resistance and preparation method thereof
CN105200344A (en) * 2015-10-15 2015-12-30 芜湖市宝艺游乐科技设备有限公司 Easy-to-demould, high-hardness and pre-hardened plastic mould steel, and preparation method thereof
CN105861942A (en) * 2016-05-13 2016-08-17 如皋市宏茂重型锻压有限公司 Cold work die steel and preparation process thereof
CN109825688A (en) * 2019-03-06 2019-05-31 江苏品模信息科技有限公司 Heat processing technique for P20 and 718 plastic die steels
CN109825688B (en) * 2019-03-06 2020-12-25 江苏品模信息科技有限公司 Hot working process for P20 and 718 plastic die steel
CN111041373A (en) * 2020-01-02 2020-04-21 中煤张家口煤矿机械有限责任公司 Medium Mn steel for chain wheel and preparation method and application thereof

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