A special cast steel for preparing large hot forging dies under high temperature and heavy load conditions and its preparation method

A hot forging die and special technology, applied in the field of cast steel manufacturing, can solve the problems that the strength, plasticity and toughness cannot meet the requirements, and achieve the effect of avoiding serious failure, reducing the scrap rate and increasing the service life.

Active Publication Date: 2018-10-16
CHONGQING UNIV +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies in the prior art above, the technical problem to be solved by the present invention is: to provide a special cast steel for preparing large-scale hot forging dies under high-temperature and heavy-load conditions, which solves the problem of the existing cast steel at a temperature above 350°C. , The local instantaneous stress is above 650MPa, and the performance of hardness, strength, plasticity, and toughness cannot meet the requirements and other technical problems, which further improves the bonding strength between the special cast steel material and the multi-gradient functional layer of additive manufacturing, effectively Improve the primary service life of large hot forging dies and increase the number of remanufacturable repairs

Method used

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  • A special cast steel for preparing large hot forging dies under high temperature and heavy load conditions and its preparation method
  • A special cast steel for preparing large hot forging dies under high temperature and heavy load conditions and its preparation method
  • A special cast steel for preparing large hot forging dies under high temperature and heavy load conditions and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Steelmaking and refining: In converter steelmaking, carbon and phosphorus in molten iron are removed to obtain molten steel; then the molten steel is refined in a refining furnace; the chemical composition of special cast steel is measured by mass percentage, and in the refining process Control the content of carbon element in molten steel to 0.42%, the content of silicon element to 0.4%, the content of manganese element to 0.8%, the content of phosphorus element to 0.02%, the content of sulfur element to 0.02%, the content of chromium element to 1.55%, nickel The element content is 1.55%, the molybdenum element content is 0.23%, and the balance is iron;

[0025] 2) Casting: Continuous casting of the molten steel obtained in step 1) to obtain a mold base billet;

[0026] 3) Water quenching and oil-cooling the mold base billet in step 3), the quenching temperature is 890°C, and then tempering the oil-cooled mold base billet, controlling the tempering temperature to 62...

Embodiment 2

[0036] 1) Steelmaking and refining: In converter steelmaking, carbon and phosphorus in molten iron are removed to obtain molten steel; then the molten steel is refined in a refining furnace; the chemical composition of special cast steel is measured by mass percentage, and in the refining process Control the content of carbon element in molten steel to 0.35%, silicon element content to 0.2%, manganese element content to 0.60%, phosphorus element content to 0.02%, sulfur element content to 0.02%, chromium element content to 1.4%, nickel element content to 1.4%, molybdenum element content Content 0.15%, the balance is iron;

[0037] 2) Casting: Continuous casting of the molten steel obtained in step 1) to obtain a mold base billet;

[0038] 3) Water quenching and oil-cooling the mold base billet in step 3), the quenching temperature is 860°C, and then tempering the oil-cooled mold base billet, controlling the tempering temperature to 600°C;

[0039] 4) Removing the sticky sand,...

Embodiment 3

[0048] 1) Steelmaking and refining: In converter steelmaking, carbon and phosphorus in molten iron are removed to obtain molten steel; then the molten steel is refined in a refining furnace; the chemical composition of special cast steel is measured by mass percentage, and in the refining process Control the content of carbon element in molten steel to 0.5%, the content of silicon element to 0.6%, the content of manganese element to 1.0%, the content of phosphorus element to 0.02%, the content of sulfur element to 0.02%, the content of chromium element to 1.7%, nickel The element content is 1.7%, the molybdenum element content is 0.3%; the balance is iron;

[0049] 2) Casting: Continuous casting of the molten steel obtained in step 1) to obtain a mold base billet;

[0050] 3) Water quenching and oil cooling the mold base billet in step 3), the quenching temperature is 920°C, and then tempering the oil-cooled mold base billet, controlling the tempering temperature to 650°C;

...

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Abstract

The invention discloses special cast steel used for preparing a large hot-work die under the high temperature and heavy load conditions. The special cast steel is composed of, by mass, 0.35-0.5% of carbon elements, 0.2-0.6% of silicon elements, 0.6-1.0% of manganese element, less than or equal to 0.02% of phosphorus elements, less than or equal to 0.02% of sulfur elements, 1.4-1.7% of chromium elements, 1.4-1.7% of nickel elements, 0.15-0.3% of molybdenum elements and the balance iron and impurities. The novel cast steel used for preparing the large hot-work die is provided, when the large hot-work die is matched with an eighty-thousand-ton die-forging hydraulic press for forming materials difficult to form under the extreme conditions with the temperature being higher than 350 DEG C and the local transient stress being greater than 650 MPa, the properties of the aspects of hardness, strength, plasticity and toughness of the large hot-work die can meet the requirements, the problem that a die substrate is severely and plastically deformed and cracked when the strength and hardness of the hot-work die are reduced rapidly under the extreme conditions is avoided, and the problem that the die fails seriously and cannot not used is avoided; and thus the service life of the hot-work die is remarkably prolonged.

Description

technical field [0001] The invention belongs to the field of cast steel manufacturing, and in particular relates to a special cast steel for preparing large-scale hot forging dies under high-temperature and heavy-load conditions and a preparation method thereof. Background technique [0002] With the development of the country's heavy equipment manufacturing industry, equipment manufacturing industries such as large aircraft and shipbuilding need to rapidly upgrade their capabilities. The world's largest large-scale die forging hydraulic press (80,000 tons press) came into being, and the large hot forging dies (single set weight has reached 60-100 tons) have been widely used in aviation, aerospace, nuclear power, petrochemical and other fields In the production and manufacture of large-scale die forgings, such as large aircraft fuselage frames, landing gear, engine turbine discs, large cylinder blocks, pump bodies, etc., the forging materials of these forgings mainly include...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C21D1/18
CPCC21D1/18C22C38/02C22C38/04C22C38/44
Inventor 周杰张建生熊逸博高飞卢顺沈力
Owner CHONGQING UNIV
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