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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

Active Publication Date: 2021-05-07
SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the shape characteristics of the thick-walled 9% Ni steel pie-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 the pie-shaped piece decreases, The hard-to-deform area gradually increases, and it is very easy to produce stress concentration. Compared with the general electroslag ingot, the 9% Ni steel ingot has more defects, the deformation resistance of the forging billet is large, and the deformable temperature range is narrow. The general upsetting method is very easy to produce cracks. Affect ontology quality
[0004] There is no domestic enterprise that has successfully manufactured super-large 9% Ni steel cake-shaped forgings in a low-temperature environment of -196°C

Method used

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

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Effect test

Embodiment 1

[0071] The composition of the cylindrical steel ingot is preferably: C 0.02%, Si 0.08%, Mn 0.69%, S 0.002%, P 0.004%, Cr 0.09%, Ni 9.88%, Mo 0.09%, Cu 0.13%, Al 0.008% , As 0.0026%, Sn0.0020%, Sb 0.0010%, Pb 0.002%, Bi 0.0018%, H 0.6ppm, O 12ppm, N 32ppm, the balance is high-purity iron Fe;

[0072] The target size of 9% Ni steel super-sized pie-shaped forgings for ultra-low temperature engineering is 3500mm in diameter D and 450mm in height H;

[0073] Based on (H 圆柱形坯体 -H 9％Ni钢饼形锻件 ) / H 圆柱形坯体 =35.7% and the principle of constant volume, the height of the cylindrical blank is 700mm, and the diameter is 2806.2mm. After rounding, the diameter of the cylindrical blank is 2810mm.

[0074] After obtaining the size of the cylindrical green body, based on (H 圆柱形钢锭 -H 圆柱形坯体 ) / H圆柱形钢锭 =75.9% and the principle of constant volume, the height of the cylindrical steel ingot is 2904.6mm, and the diameter is 1379.5mm. After rounding, the height of the cylindrical steel ingot is 2900mm,...

Embodiment 2

[0090] The composition of the cylindrical steel ingot is preferably: C 0.05%, Si 0.11%, Mn 0.68%, S 0.002%, P 0.005%, Cr 0.13%, Ni 9.76%, Mo 0.12%, Cu 0.14%, Al 0.010% , As 0.0028%, Sn0.0018%, Sb 0.0009%, Pb 0.0021%, Bi 0.0020%, H 0.8ppm, O 15ppm, N 34ppm, the balance is high-purity iron Fe;

[0091] The target size of 9% Ni steel super-sized pie-shaped forgings for ultra-low temperature engineering is 3500mm in diameter D and 450mm in height H;

[0092] Based on (H 圆柱形坯体 -H 9％Ni钢饼形锻件 ) / H 圆柱形坯体 =35.7% and the principle of constant volume, the height of the cylindrical blank is 700mm, and the diameter is 2806.2mm. After rounding, the diameter of the cylindrical blank is 2810mm.

[0093] After obtaining the size of the cylindrical green body, based on (H 圆柱形钢锭 -H 圆柱形坯体 ) / H圆柱形钢锭 =75.9% and the principle of constant volume, the height of the cylindrical steel ingot is 2904.6 mm, and the diameter is 1379.5 mm. After rounding, the height of the cylindrical steel ingot is 2900...

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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.

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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Application Information

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IPC IPC(8): B21J5/00C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/60C21D1/78
CPCB21J5/002C22C38/02C22C38/04C22C38/002C22C38/44C22C38/42C22C38/06C22C38/008C22C38/60C22C38/001C21D1/785
Inventor 李向王长军陶志勇刘振宝周恩民聂徐庆雷雪梁剑雄洪兴福张智峰杨志勇
Owner SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD
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