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Technology of medium carbon chromium nickel molybdenum vanadium steel forgings with high strength and impact toughness

A medium-carbon chromium-nickel-molybdenum, impact toughness technology, applied in metal processing equipment and other directions, can solve problems such as the inability to meet material requirements, and achieve the effect of good strength and good low temperature impact toughness

Active Publication Date: 2021-02-09
武汉重工铸锻有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current smelting method of Cr-Ni-Mo-V series steel forgings is electric furnace smelting + refining furnace refining + argon protection pouring, the properties of medium carbon Cr-Ni-Mo-V series steel forgings after forging, quenching and tempering : Rm≥900MPa, AKV2(-40℃)≥34J, which cannot meet the needs of current materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: The melting analysis of the chemical composition of Cr-Ni-Mo-V steel forgings is as follows: C: 0.36%, Cr: 1.2%, Ni: 3.0%, Mo: 0.32%, V: 0.11%.

[0033] 1) Smelting in an electric furnace first, forming molten steel for primary smelting, and then entering the refining furnace for refining. During the refining process, two vacuum treatments are carried out; after the refining is completed, it is poured into a consumable electrode under the protection of argon; the consumable electrode is then subjected to electroslag Remelting to form Cr-Ni-Mo-V series steel forging ingots;

[0034] Two vacuum treatments in the refining process: the first vacuum treatment, vacuum degree: 80Pa, holding time 15 minutes; the second vacuum treatment, vacuum degree 40Pa, holding time 15 minutes;

[0035] Pouring the consumable electrode under the protection of argon gas: argon gas is introduced into the casting mold, and the pressure in the furnace is maintained at 0.4 MPa for 6 mi...

Embodiment 2

[0046] Embodiment 2: with embodiment 1, the difference is,

[0047] The melting analysis of the chemical composition of Cr-Ni-Mo-V steel forgings is as follows: C: 0.34%, Cr: 1.22%, Ni: 3.02%, Mo: 0.34%, V: 0.11%;

[0048] The specific steps of smelting are as follows:

[0049] 1) For the first vacuum treatment, the vacuum degree is 100Pa, and the holding time is 13 minutes; for the second vacuum treatment, the vacuum degree is 50Pa, and the holding time is 14 minutes;

[0050] Inject argon gas into the pouring mold to keep the pressure in the furnace at 0.6 MPa for 5 minutes;

[0051] The conditions of electroslag remelting: at cooling circulating water temperature of 30°C, remelting melting rate of 12.5Kg / min, adding Si-Ca powder deoxidizer in the early and late stages of remelting; the amount of Si-Ca powder deoxidizer added is 0.5Kg / t .

[0052] 2) After reheating the Cr-Ni-Mo-V series steel forging ingot smelted in step 1) to 1270°C, it is forged on a press with a pres...

Embodiment 3

[0060] Embodiment 3: with embodiment 1, the difference is,

[0061] The melting analysis of the chemical composition of Cr-Ni-Mo-V steel forgings is as follows: C: 0.33%, Cr: 1.18%, Ni: 3.0%, Mo: 0.33%, V: 0.13%;

[0062] The specific steps of smelting are as follows:

[0063] 1) For the first vacuum treatment, the vacuum degree is 130Pa, and the holding time is 16 minutes; for the second vacuum treatment, the vacuum degree is 65Pa, and the holding time is 15 minutes;

[0064] Inject argon gas into the pouring mold to keep the pressure in the furnace at 0.7MPa for 5 minutes;

[0065] The electroslag remelting conditions: cooling cycle water temperature of 40°C, remelting melting rate of 12Kg / min, adding Si-Ca powder deoxidizer in the early and late stages of remelting; Si-Ca powder deoxidizer added in an amount of 0.4Kg / t.

[0066] 2) After reheating the Cr-Ni-Mo-V series steel forging ingot smelted in step 1) to 1250°C, it is forged on a press with a pressure of 16MN, and t...

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Abstract

The invention relates to a process of a medium carbon Cr-Ni-Mo-V steel forging with high strength and high impact toughness. A steel ingot is formed by adopting the ways of electric furnace smelting,refining furnace smelting, two-times vacuum treatment, argon protective casting and electroslag remelting and smelting, the quality of the steel ingot is improved, the purity is improved, and the strength and the low-temperature impact toughness of the steel forging are enhanced. The forging molding is performed on a 16 MN pressing machine, the forging times is 2-3, and the last pass of deformation is 15%-20% in last fire; and the total forging ratio is 7.9-9.2. After the deformation is completed, quick annealing and cooling are performed to enable the temperature to be lower than the martensitic transformation finishing temperature, a substrate generates dispersively distributed martensites, quenching and tempering thermal treatment ways are adopted for thermal treatment after annealing and cooling, and the forging is quickly austenitized, crystallized and refined. The medium carbon Cr-Ni-Mo-V steel forging with high strength (Rm is larger than or equal to 1,130 MPa) and high impact toughness (AKV2(-50 DEG C) is larger than or equal to 70 J) is obtained through tempering at an appropriate temperature.

Description

technical field [0001] The invention relates to a process for manufacturing a steel forging, in particular to a process for a medium-carbon chromium-nickel-molybdenum-vanadium steel forging capable of high strength and impact toughness. Background technique [0002] The medium carbon Cr-Ni-Mo-V series steel forging is a kind of alloy structural steel, which has good comprehensive mechanical properties after quenching and tempering treatment, and is widely used in various industries. With the development of science and technology, the use conditions of Cr-Ni-Mo-V series steel forgings are becoming more and more demanding, which requires not only high tensile strength, but also high low temperature impact toughness. [0003] The current smelting method of Cr-Ni-Mo-V series steel forgings is electric furnace smelting + refining furnace refining + argon protection pouring, the properties of medium carbon Cr-Ni-Mo-V series steel forgings after forging, quenching and tempering : ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/46C22C38/44C22C33/04C21C7/10C21C7/06C21D8/00C21D1/26C21D1/18B21J5/00
CPCB21J5/002C21C7/06C21C7/10C21D1/18C21D1/26C21D8/005C22C33/04C22C38/44C22C38/46
Inventor 黄永强陈国遂罗波刘国平张承峰黄丽秋汪洋马晓兵曾文锋曹虹来坤领
Owner 武汉重工铸锻有限责任公司
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