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Manufacturing method of stainless steel large forging for thermonuclear fusion reactor

A technology of thermonuclear fusion and production methods, applied in the direction of metal processing equipment, etc., can solve the problems of large turning volume, long delivery cycle, and many surface cracks

Active Publication Date: 2014-12-03
NORTHEASTERN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] If the forging is produced by the usual forging process, the grain size of the forging is less than grade 2, and there are many surface cracks, and the crack depth reaches more than 2mm; it cannot meet the requirements of ITER for the grain size of the forging ≥ grade 2, and the forging is due to the surface Deep cracks require a large amount of turning, resulting in high production costs and long lead times

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The stainless steel grade of this embodiment is 316L(N)-IG.

[0040] Finished product specifications: 450 -0 +30 ×1100 -0 +50 ×2193 0 +50 mm.

[0041] Theoretical weight of finished forgings: 8.608 tons.

[0042] The steps of this embodiment are as follows:

[0043] (1) Steel ingot pretreatment

[0044] Steel ingot size and type: circular frustum steel ingot, the diameter of the lower section is 1000mm, the diameter of the upper section is 945mm, the height is 1807mm (height after cutting the head and tail), and the height / diameter ratio is 1.8.

[0045] Ingot weight (after removing head and tail): 11.100 tons.

[0046] Chemical composition of steel ingot:

[0047] C: 0.012% Si: 0.43% Mn: 1.77% Cr: 16.26%

[0048] Ni: 13.77% P: 0.016% S: 0.002% N: 751ppm

[0049] Mo: 2.15% Co: 0.03%, Nb: 0.01%, Ta: 0.010%

[0050] (2) Steel ingot heating

[0051]The first fire heating: the steel ingot is put into the furnace as a cold ingot, and heated at a temperature bel...

Embodiment 2

[0071] The stainless steel grade of this embodiment is 316LN.

[0072] Finished product specifications: 600 -0 +30 ×1500 -0 +50 ×1900 0 +50 mm.

[0073] Theoretical weight of finished forgings: 13.56 tons.

[0074] The steps of this embodiment are as follows:

[0075] (1) Steel ingot

[0076] Steel ingot size and type: circular frustum steel ingot, the diameter of the lower section is 1200mm, the diameter of the upper section is 1135mm, the height is 1850mm (height after cutting the head and tail), and the height / diameter ratio is 1.58.

[0077] Ingot weight (after removing the head and tail): 15.70 tons.

[0078] Chemical composition of steel ingot:

[0079] C: 0.017% Si: 0.50% Mn: 1.51% Cr: 16.15%

[0080] Ni: 12.43% P: 0.018% S: 0.0012% N: 1312ppm

[0081] Mo: 2.08% Co: 0.03%, Nb: 0.01%, Ta: 0.010%

[0082] (2) Steel ingot heating

[0083] The first fire heating: the steel ingot is put into the furnace as a cold ingot, and heated at a temperature below 500°C a...

Embodiment 3

[0104] The stainless steel grade of this embodiment is 316L.

[0105] Finished product specifications: 450 -0 +30 ×1150 -0 +50 ×2100 -0 +50 mm.

[0106] Theoretical weight of finished forgings: 8.62 tons.

[0107] The steps of this embodiment are as follows:

[0108] (1) Steel ingot

[0109] Steel ingot size and type: octagonal steel ingot, the diameter of the lower section is 1150mm, the diameter of the upper section is 1175mm, the height is 2230mm (height after cutting the head and tail), and the height / diameter ratio is 2.0.

[0110] Ingot weight (after removing the head and tail): 18.65 tons.

[0111] Chemical composition of steel ingot:

[0112] C: 0.015% Si: 0.48% Mn: 1.62% Cr: 16.32%

[0113]Ni: 12.50% P: 0.018% S: 0.001% N: 880ppm

[0114] Mo: 2.11% Co: 0.03%, Nb: 0.01%, Ta: 0.010%

[0115] (2) Steel ingot heating

[0116] The first fire heating: the steel ingot is put into the furnace as a cold ingot, and heated at a temperature below 500°C at a rate of ...

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Abstract

The invention discloses a manufacturing method of a stainless steel large forging for a thermonuclear fusion reactor. The manufacturing method comprises the following steps: (1) preprocessing of a steel ingot; (2) heating of the steel ingot; (3) forging of the steel ingot; (4) twice upsetting forging and twice drawing out of the ingot; (5) shaping of the finished product; (6) heating processing of finished product forgings, wherein the finally obtained the stainless steel large forging is 300-1000 mm in thickness, 300-1800 mm in width and 500-2200 mm in length. The manufacturing method realizes that the grain size of the stainless steel large forging is greater than or equal to the second level, the depth of surface cracks of the stainless steel large forging is less than 1 mm, and the stainless steel large forging satisfies the quality requirement of the thermonuclear fusion reactor (the ITER Plan included).

Description

technical field [0001] The invention relates to a production method for a large stainless steel forging for a thermonuclear fusion reactor, in particular to a production method for a stainless steel forging with a thickness of 300-1000mm and a width of 300-1800mm for a thermonuclear fusion reactor. Background technique [0002] The ITER program (International Thermonuclear Experimental Reactor International Thermonuclear Experimental Reactor) is a new type of thermonuclear experimental reactor project participated by seven countries and regions including the European Union, the United States, China, Japan, Russia, India and South Korea. [0003] The project requires a large number of 316LN and 316L(N)-IG stainless steel forging products with a thickness exceeding 300mm. The main stainless steel material components are as follows: [0004] Steel number: 316L(N)-IG, composition requirements: C ≤ 0.03%, Si ≤ 0.75%, Mn ≤ 2.00%, P ≤ 0.03%, S ≤ 0.01%, Cr 16.00%-18.00%, Ni 11.00%-1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/00B21J5/06B21J5/08B21J1/06
Inventor 刘承志姜周华李花兵尹嵬李筱张剑桥
Owner NORTHEASTERN UNIV
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