Manufacturing method of 9% Ni steel ultra-large-specification cake-shaped forge piece for ultralow-temperature engineering

A technology with super-large specifications and manufacturing methods, which is applied in the field of metal thermal processing, can solve the problems of narrow deformable temperature range, high deformation resistance of forging billets, and easy cracks, etc., to eliminate the source of crack induction, improve surface plasticity, and avoid cracks. Effect
CN112756525AActive Publication Date: 2021-05-07SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD +3
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD
Publication Date
2021-05-07

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Abstract

The invention provides a manufacturing method of a 9% Ni steel ultra-large-specification cake-shaped forge piece for ultralow-temperature engineering, is suitable for manufacturing the 9% Ni steel ultra-large-specification cake-shaped forge piece with the diameter larger than 3000 mm and the thickness larger than 400 mm, and belongs to the technical field of metal hot working. The surface defects of a cylindrical steel ingot are cleaned through polishing, and a crack induction source is eliminated; the surface structure of the steel ingot is broken through stepped heating and pressing treatment, the surface plasticity of the cylindrical steel ingot is improved, the surface quality is improved, and a forging stock with good performance is obtained; and then the forging stock is subjected to three times of upsetting and two times of drawing-out, coarse grains in the forging stock are rapidly refined, a cylindrical blank body with excellent performance is obtained, the structure uniformity of the 9% Ni steel cake-shaped forge piece for the ultralow-temperature engineering is finally guaranteed, and forge piece cracks are avoided. The data of the embodiment show that the grain size of the obtained 9% Ni steel ultra-large-specification cake-shaped forge piece for the ultralow-temperature engineering reaches the level 6 or above, and the 9% Ni steel ultra-large-specification cake-shaped forge piece has extremely excellent room-temperature and low-temperature mechanical properties.
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Description

technical field

[0001] The invention relates to the technical field of metal thermal processing, in particular to a method for manufacturing a 9% Ni steel super-sized pie-shaped forging for ultra-low temperature engineering. Background technique

[0002] 9% Ni steel is a ferritic structural material that can be used at -196°C. Since the steel contains about 9% Ni, there is no ductile-brittle transition above -196°C, so it has excellent low temperature toughness. The structure of 9% Ni steel is a mixed structure of martensite and austenite after quenching and tempering treatment. If it is kept warm in the two-way zone, its structure is based on martensite, with austenite and ferrite Mixed tissues of the body.

[0003] For the shape characteristics of thick-walled 9% Ni steel cake-shaped forgings: the diameter is much larger than the height, and the height is generally less than 400mm; such shape forgings are generally formed by upsetting and stripping, but as the height of t...

Claims

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