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Forging method for improving high-nitrogen stainless steel grain size

A technology of high-nitrogen stainless steel and grain size, which is applied in the field of forging technology, can solve the problems such as the decrease of the strength of forgings, achieve the effect of improving the strength of forgings and avoiding the generation of coarse grains

Active Publication Date: 2020-10-09
无锡航亚科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem that M30NW high-nitrogen stainless steel will have coarse grains during forging, resulting in a decrease in the strength of forgings, the invention provides a forging method for improving the grain size of high-nitrogen stainless steel, which can avoid the generation of coarse grains, thereby improving the strength of forgings

Method used

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  • Forging method for improving high-nitrogen stainless steel grain size
  • Forging method for improving high-nitrogen stainless steel grain size
  • Forging method for improving high-nitrogen stainless steel grain size

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Step 1. Use a flat forging machine to upset M30NW stainless steel blanks and bend them according to the shape of the parts. The heating temperature for upsetting forging is 1020°C-1080°C, the heating coefficient is 0.4-0.5min / mm, and the temperature is kept until it is evenly heated After that, it is immediately out of the furnace for upsetting and bending;

[0017] Step 2: pre-forging the bent blank, the forging heating temperature is 1020°C-1080°C, the heating coefficient is 0.4-0.5min / mm, and the deformation in the thickness direction of the pre-forging is 35%;

[0018] Step 3: Carry out final forging to the pre-forged blank, the forging heating temperature is 1020°C-1080°C, the heating coefficient is 0.4-0.5min / mm, the deformation in the thickness direction of the final forging is 25%, and the deformation in the width direction is 20%;

[0019] Step 4: Perform homogenization annealing on the billet after final forging, heat it to 1030°C-1070°C, keep it wa...

Embodiment 2

[0021] Example 2: Step 1: Use a flat forging machine to upset M30NW stainless steel blanks and bend them according to the shape of the parts. The heating temperature for upsetting forging is 1020°C-1080°C, the heating coefficient is 0.4-0.5min / mm, and the temperature is kept until it is evenly heated After that, it is immediately out of the furnace for upsetting and bending;

[0022] Step 2: pre-forging the bent blank, the forging heating temperature is 1020°C-1080°C, the heating coefficient is 0.4-0.5min / mm, and the deformation in the thickness direction of the pre-forging is 25%;

[0023] Step 3: Perform final forging on the pre-forged blank, the forging heating temperature is 1020°C-1080°C, the heating coefficient is 0.4-0.5min / mm, the deformation in the thickness direction of the final forging is 20%, and the deformation in the width direction is 5%;

[0024] Step 4: Perform homogenization annealing on the billet after final forging, heat it to 1030°C-1070°C, keep it warm ...

Embodiment 3

[0026] Example 3: Step 1, using a flat forging machine to upset M30NW stainless steel billet and bend it according to the shape of the part. The heating temperature of the upsetting forging is 1020°C-1080°C, the heating coefficient is 0.4-0.5min / mm, and the temperature is kept until it is evenly heated After that, it is immediately out of the furnace for upsetting and bending;

[0027] Step 2: pre-forging the bent blank, the forging heating temperature is 1020°C-1080°C, the heating coefficient is 0.4-0.5min / mm, and the deformation in the thickness direction of the pre-forging is 40%;

[0028] Step 3: Perform final forging on the pre-forged blank, the forging heating temperature is 1020°C-1080°C, the heating coefficient is 0.4-0.5min / mm, the deformation in the thickness direction of the final forging is 10%, and the deformation in the width direction is 8%;

[0029] Step 4: Perform homogenization annealing on the billet after final forging, heat it to 1030°C-1070°C, keep it war...

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Abstract

The invention provides a forging method for improving the high-nitrogen stainless steel grain size. The generation of coarse grains can be avoided, so that the strength of a forge piece is improved. The forging method for improving the high-nitrogen stainless steel grain size comprises the following steps of (1) carrying out upset forging on an M30NW stainless steel blank, and bending according toa part shape; (2) pre-forging and forming a bent blank, wherein the deformation in the pre-forging thickness direction ranges from 25 percent to 40 percent, the heating temperature for forging rangesfrom 1020 DEG C to 1080 DEG C, and a heating coefficient ranges from 0.4 to 0.5min / mm; (3) finish-forging and forming a pre-forged blank, wherein the deformation in the finish-forging thickness direction ranges from 10 percent to 25 percent, the deformation in the width direction ranges from 5 percent to 20 percent, the heating temperature for forging ranges from 1020 DEG C to 1080 DEG C, and a heating coefficient ranges from 0.4 to 0.5min / mm; and (4) carrying out heat treatment on a finish-forged blank.

Description

technical field [0001] The invention relates to the technical field of forging technology, in particular to a forging method for improving the grain size of high-nitrogen stainless steel. Background technique [0002] M30NW is a nitrogen-containing austenitic stainless steel with improved high mechanical properties and high corrosion resistance over traditional 316L. M30NW is supplied in annealed condition and is often used in the manufacture of forged implants. The steel is also available in the cold-worked state and is used in the manufacture of spinal systems, intramedullary nails and various fracture fixation devices. However, during forging, there is a problem that the grains are easy to grow when heated. In the case of grain growth, if the forging deformation is small, coarse grains will appear, resulting in a sharp drop in the strength of the forging. Contents of the invention [0003] Aiming at the problem that coarse grains of M30NW high-nitrogen stainless steel ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/00B21K29/00C21D1/26C21D1/74
CPCB21J5/00B21K29/00C21D1/26C21D1/74
Inventor 张井波王率领何涛李湘军
Owner 无锡航亚科技股份有限公司