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A kind of forging method of cr18mn18n steel forging and forging

A cr18mn18n, forging technology, applied in the field of manufacturing, can solve the problems of deformed crystals, serious surface cracks, coarse crystals and mixed crystals, etc., and achieve the effects of small microscopic defects, complete metal streamlines, and good processing performance

Active Publication Date: 2018-12-25
PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a forging method of Cr18Mn18N steel forgings and forgings, which aims to improve the problems of severe surface cracks, deformed crystals, coarse crystals and mixed crystals in forgings in the existing forging production process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The forging method of the Cr18Mn18N steel forging provided by the present embodiment comprises the following steps:

[0030] Forging blanking:

[0031] The billet made of Cr18Mn18N steel is heated to the steel ingot heating temperature of 1220°C-1240°C and released from the furnace, and upsetting is performed to the height H of the whole ingot of 1000mm-1100mm. Return to the furnace and hold for 1-1.5h, then take it out of the furnace, and carry out a fire-drawing process with a pass reduction of 10mm-20mm to reach the diameter of the entire ingot Blanks are obtained by blanking. Cutting size is (height-to-diameter ratio is 1.84), return to the furnace for 1-1.5 hours; out of the furnace, upsetting to a height of H 650mm-700mm, return to the furnace for 1-1.5 hours. baked, adopted Punch punching, control the thickness of the punch material to 45mm-50mm, return to the furnace to cool down to the forming heating temperature of 1190°C-1210°C, and keep warm for 1-1.5...

Embodiment 2

[0038] The forging method of the Cr18Mn18N steel forging provided by the present embodiment comprises the following steps:

[0039] Forging blanking

[0040] The billet made of Cr18Mn18N steel is heated to the ingot heating temperature of 1230°C-1250°C, and then released from the furnace. Upsetting treatment to the height of the whole ingot H 1000mm, return to the furnace for 2.5-3h. Out of the furnace, the pass reduction is 10mm-15mm and pulled out to Return to the furnace to keep warm for 2-2.5h. Then out of the oven, the pass reduction is 30mm-50mm and pulled out to Blanks are obtained by blanking. Cutting size is (Height-to-diameter ratio is 1.99), return to the furnace for 1-5 hours; out of the furnace, upsetting to a height of H550mm-600mm, return to the furnace for 1-1.5 hours. baked, adopted Punch with a punch, control the thickness of the punch material to 50mm-60mm, return to the furnace to cool down to the forming heating temperature of 1200±10°C, and kee...

Embodiment 3

[0048] The forging method of the Cr18Mn18N steel forging provided by the present embodiment comprises the following steps:

[0049] Forging blanking

[0050] The billet made of Cr18Mn18N steel is heated and formed at a heating temperature of 1240°C-1260°C, out of the furnace, upsetting to the height of the whole ingot H 1000mm-1100mm, and returned to the furnace for 3-3.5h. Out of the furnace, the length of the pass is 10mm-20mm and the length is processed to Return to the furnace to keep warm for 3-3.5h. out of the oven, and then processed with a pass reduction of 20mm-30mm Blanking to obtain blanks, blanking: (The aspect ratio is 1.29), return to the furnace for 3-3.5h. Out of the furnace, the upsetting height H is 500mm-600mm, and it is returned to the furnace for 1-1.5h. baked, adopted Punch punching, control the thickness of the punch material to 40mm-50mm, return to the furnace to cool down to the ingot heating temperature of 1230±10°C, and keep warm for 3-3.5h...

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Abstract

The invention provides a forging method of a Cr18Mn18N steel forge piece and the forge piece and relates to the manufacturing field. The forging method of the Cr18Mn18N steel forge piece comprise the following steps of: heating a Cr18Mn18N steel ingot to a heating moulding temperature of 1190-1210 DEG C; carrying out heat preservation at the heating moulding temperature; carrying out repeated firing forging moulding; and then cooling. In the repeated firing forging moulding step, firing deformation during each firing is 10-20%, and final forging temperature is 850-950 DEG C. The forging method has the advantages that multiple steps coordinate with each other, so that the finally obtained forge piece is free of cracks on the surface, fibrous tissues of the forge piece are consistent with shape of the forge piece, and a metal streamline is complete; and defects are small, demands can be met, and machining dimension can be guaranteed.

Description

technical field [0001] The invention relates to the field of manufacturing, in particular to a forging method of a Cr18Mn18N steel forging and the forging. Background technique [0002] Cr18Mn18N steel is a high-manganese and high-nitrogen austenitic stainless steel. Because its plasticity and toughness are higher than the original retaining ring steel, and it has high stress corrosion resistance, it is widely used as retaining ring steel to manufacture large Generator guard ring. [0003] The forgings produced by the existing forging methods often have surface cracks and serious problems of mixed crystals, which cannot meet the requirements of subsequent processes for forgings. The requirements for forgings of generator retaining rings are embodied in: the size and surface of forgings meet the machining requirements of users. During longitudinal wave flaw detection, no ≥ equivalent Defects; dense defects are not allowed, and the first bottom wave reflection is not allow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/00B21J5/06B21J5/10B21J5/08
CPCB21J5/00B21J5/06B21J5/08B21J5/10
Inventor 韩涛代永斌王川东
Owner PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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