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Heat treatment method for martensitic stainless steel forging module

A technology of martensitic stainless steel and heat treatment method, which is applied in the field of heat treatment of martensitic stainless steel forging modules, and can solve the problems of low degree of austenitization and poor corrosion resistance, etc.

Active Publication Date: 2013-01-30
PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the scope of application of this patent application only includes steel pipes with a wall thickness of 5-15mm. Its core content is mainly to reduce the time required for surface reheating by adjusting the water cooling time (to reduce the time of each water cooling), so as to improve the heat treatment efficiency. the goal of
Moreover, the patent application selects a quenching heating temperature below 980°C, and the degree of austenitization is low, so that the grains are fine and the risk of quenching cracking is reduced, but the corrosion resistance is poor

Method used

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Examples

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Effect test

Embodiment 1

[0040] A kind of 40Cr13 martensitic stainless steel forging module is carried out water air gap cooling and quenching heat treatment, wherein, obtain 40Cr13 martensitic stainless steel forging module by following steps:

[0041] a. Smelting: primary smelting in electric furnace, ladle refining in LF heating furnace and vacuum degassing process in VD furnace. 0.010%, Cr 12.0%, Ni 0.11%, the balance is iron and unavoidable impurities; cast into 5t octagonal ingot after tapping;

[0042] b. Forging module: send 5t octagonal ingots to the heating furnace at a temperature of ≥300°C, and after heating to 1150°C, use a 2000t press to forge a module with a thickness of 100mm and a width of 300mm. The forging ratio is ≥4, and after spheroidization Annealing, polishing or turning, milling and local grinding to remove surface defects, and after passing the GB / T4162-91 standard B-level ultrasonic flaw detection inspection, cold sawing end faces are cut into 1.0-8.0 meters long according t...

Embodiment 2

[0048] A kind of 40Cr13 martensitic stainless steel forging module is carried out water air gap cooling and quenching heat treatment, wherein, obtain 40Cr13 martensitic stainless steel forging module by following steps:

[0049] a. Smelting: primary smelting in electric furnace, ladle refining in LF heating furnace and vacuum degassing process in VD furnace. 0.002%, Cr 14.00%, Ni 0.32%, the balance is iron and unavoidable impurities; cast into 40t octagonal ingot after tapping;

[0050] b. Forging module: send 40t octagonal ingot to the heating furnace at a temperature of ≥300°C, heat it to 1240°C and use a 4000t press to forge it into a module with a thickness of 400mm and a width of 1300mm. The forging ratio is ≥4. Annealing, polishing or turning, milling, and local grinding to remove surface defects, and after passing the GB / T4162-91 standard B-level ultrasonic flaw detection inspection, the cold sawing end face is cut into 1.0-8.0 meters long according to the order require...

Embodiment 3

[0056] A kind of 40Cr13 martensitic stainless steel forging module is carried out water air gap cooling and quenching heat treatment, wherein, obtain 40Cr13 martensitic stainless steel forging module by following steps:

[0057] a. Smelting: primary smelting in electric furnace, ladle refining in LF heating furnace and vacuum degassing process in VD furnace. 0.003%, Cr 14.00%, Ni 0.09%, the balance is iron and unavoidable impurities; cast into 19t octagonal ingot after tapping;

[0058] b. Forging module: Send 19t octagonal ingots to the heating furnace at a temperature of ≥300°C, and after heating to 1220°C, use a 4,000t press to forge a module with a thickness of 280mm and a width of 800mm. The forging ratio is ≥4, and after spheroidization Annealing, polishing or turning, milling, and local grinding to remove surface defects, and after passing the GB / T4162-91 standard B-level ultrasonic flaw detection inspection, the cold sawing end face is cut into 1.0-8.0 meters long acco...

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Abstract

The invention provides a heat treatment method for a martensitic stainless steel forging module. The martensitic stainless steel forging module is formed by smelting and forging; and the thickness of the module is 100-400mm, and the width of the module is 300-1300mm. The heat treatment method for the martensitic stainless steel forging module comprises the following steps of: heating the martensitic stainless steel forging module at the temperature of 1000-1050 DEG C to austenitize; executing water-air gap cooling quenching; and performing a tempering process at the temperature of 600-650 DEG C for keeping the temperature for 10-20 hours after the quenching is finished. A pre-hardening forging module is treated by the quenching and high-temperature tempering regulation treatment of the manufactured martensitic stainless steel, so that requirements on chemical components, surface-center hardness and ultrasonic flaw detection can be met totally.

Description

technical field [0001] The invention belongs to the manufacturing field of iron-based alloy steel products, in particular, the invention relates to a water-space gap cooling and quenching heat treatment method suitable for producing martensitic stainless steel forging modules used as pre-hardened plastic mold steel steel, especially The invention relates to a 20Cr13-40Cr13 martensitic stainless steel forging module cooling, quenching, quenching and tempering heat treatment method in a water-space gap. Background technique [0002] The hardenability of 20Cr13-40Cr13 martensitic stainless steel is good. The workpiece of general size is heated to about 1000 ℃ and quenched by oil cooling. It can be hardened into martensite or martensite + bainite mixed structure. However, the use of oil cooling for forged modules with effective dimensions exceeding 150mm cannot guarantee hardening. If water cooling is used, the hardenability requirements of the forged module can be met, but too...

Claims

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Application Information

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IPC IPC(8): C21D1/18
Inventor 谢珍勇屈小科李伟高青松
Owner PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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