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Forging technology of Cr 12 annular forging piece

A ring forging and process technology, applied in the field of Cr12 ring forging processing, can solve the problems of carbide segregation, poor thermal conductivity, and high brittleness, and achieve the effect of slight carbide segregation, good thermal conductivity, and low brittleness

Inactive Publication Date: 2016-09-21
ANHUI RUIJIE FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cr12 die steel has poor thermal conductivity, severe carbide segregation, high brittleness, and cracks are easily generated when heated and forged

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A kind of forging technology of Cr12 ring forging, this technology is made up of following steps:

[0014] (1) Choose Cr12 steel. There should be no visible defects on the surface of Cr12 steel. If there are any defects, they should be polished immediately before use;

[0015] (2) Cr12 steel is loaded into the furnace, and there should be a gap between the Cr12 steel after the furnace is loaded, and the gap distance is 1 / 2D, and D is the diameter of the Cr12 steel, so that the Cr12 steel is evenly heated;

[0016] (3) Cr12 steel is heated once in the furnace, the first heating temperature is 500 ℃, and then heat preservation treatment is carried out once, the first heat preservation temperature is 500 ℃, and the first heat preservation time is 5 minutes;

[0017] (4) Carry out secondary heating to Cr12 steel, secondary heating temperature is 750 ℃, then carry out secondary insulation treatment, secondary insulation temperature is 750 ℃, and secondary insulation time is ...

Embodiment 2

[0022] A kind of forging technology of Cr12 ring forging, this technology is made up of following steps:

[0023] (1) Choose Cr12 steel. There should be no visible defects on the surface of Cr12 steel. If there are any defects, they should be polished immediately before use;

[0024] (2) Put the Cr12 steel into the furnace. After the furnace is loaded, there should be a gap between the Cr12 steels. The gap distance is 7 / 12D, and D is the diameter of the Cr12 steel, so that the Cr12 steel is evenly heated;

[0025] (3) Cr12 steel is heated once in the furnace, the first heating temperature is 550 ℃, and then one heat preservation treatment is carried out, the first heat preservation temperature is 525 ℃, and the first heat preservation time is 8.5 minutes;

[0026] (4) Carry out secondary heating to Cr12 steel, secondary heating temperature is 775 ℃, then carry out secondary insulation treatment, secondary insulation temperature is 775 ℃, and secondary insulation time is 11 min...

Embodiment 3

[0031] A kind of forging technology of Cr12 ring forging, this technology is made up of following steps:

[0032] (1) Choose Cr12 steel. There should be no visible defects on the surface of Cr12 steel. If there are any defects, they should be polished immediately before use;

[0033] (2) Put the Cr12 steel into the furnace, there should be a gap between the Cr12 steel after the furnace is loaded, the gap distance is 2 / 3D, and D is the diameter of the Cr12 steel, so that the Cr12 steel is evenly heated;

[0034] (3) Cr12 steel is heated once in the furnace, the first heating temperature is 600 ℃, and then heat preservation treatment is carried out once, the first heat preservation temperature is 550 ℃, and the first heat preservation time is 12.5 minutes;

[0035] (4) Carry out secondary heating to Cr12 steel, the secondary heating temperature is 800 ℃, then carry out secondary heat preservation treatment, the secondary heat preservation temperature is 800 ℃, and the secondary ...

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PUM

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Abstract

The invention relates to a forging technology of a Cr 12 annular forging piece, and belongs to the technical field of processing of the Cr 12 annular forging pieces. The forging technology comprises the following steps of (1) selecting Cr 12 steel, wherein visible defects cannot exist on the surface of the Cr 12 steel, and if the visible defects exist, immediately polishing the Cr 12 steel until the visible defects are completely polished for use; (2) placing the Cr 12 steel into a furnace, wherein gaps are reserved between the Cr 12 steel after the CR12 steel is placed in the furnace; (3) performing first-time heating on the Cr 12 steel in the furnace, and then performing first-time heat preservation; (4) performing second-time heating on the first-time heat preserved Cr 12 steel, and then performing second-time heat preservation; (5) forging the second-time heat preserved Cr 12 steel, firstly forging softly, and when the temperature of the softly forged Cr 12 steel is 950-1000 DEG C, enhancing hammering force; and (6) after slowly cooling the forged Cr 12 steel to 600-700 DEG C, loading the cooked Cr 12 steel in the furnace, and performing. The Cr 12 annular forging piece processed by the forging technology disclosed by the invention is free from cracks during heating or forging, low in carbide segregation, good in thermal conductivity and low in brittleness.

Description

technical field [0001] The invention belongs to the technical field of processing Cr12 ring forgings, and in particular relates to a forging process of Cr12 ring forgings. Background technique [0002] Cr12 die steel belongs to high carbon and high chromium ledeburite steel, and it is also a widely used cold work die steel. The steel has good hardenability, wear resistance and hot workability. Carbide is well distributed in steel and can be used to manufacture various cold working dies with complex shapes and heavy working conditions. Cr12 die steel has poor thermal conductivity, severe carbide segregation, high brittleness, and cracks are easily generated when heated and forged. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a forging process of a Cr12 ring forging. [0004] In order to solve the above problems, a kind of Cr12 ring forging process of the present invention, the process is made up of the follo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00C21D9/40
CPCC21D8/005C21D9/40
Inventor 吕美莲刘春超冯宝倪吕俊吕诚
Owner ANHUI RUIJIE FORGING