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Tempering technology of G18CrMo2-6 steel

A technology of process and process parameters, which is applied in the direction of manufacturing tools, heat treatment equipment, heat treatment process control, etc., can solve the problems of uneven performance, carbide particle growth, etc., and achieve scientific design results, small carbides, and good impact toughness. Effect

Active Publication Date: 2013-12-11
INST OF METAL RESEARCH - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a tempering process for G18CrMo2-6 steel, which solves the problem of abnormal growth of carbide particles in the heat treatment process, resulting in uneven performance

Method used

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  • Tempering technology of G18CrMo2-6 steel
  • Tempering technology of G18CrMo2-6 steel
  • Tempering technology of G18CrMo2-6 steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In this example, the G18CrMo2-6 steel material is G18CrMo2-6, and its chemical composition is shown in Table 1:

[0030] Table 1, chemical composition of nuclear power high pressure cylinder G18CrMo2-6 (mass fraction, %)

[0031] the element

C

Si

mn

P

S

Cu

Composition specification

0.15～0.20

0.20～0.60

0.50～0.90

≤0.025

≤0.025

≤0.50

the element

Cr

Mo

Ni

V

Fe

-

Composition specification

0.40～0.65

0.45～0.70

0.30～0.50

≤0.04

bal.

-

[0032] 1) Heat the G18CrMo2-6 steel G18CrMo2-6 that has been subjected to normalizing heat treatment to 660°C at a heating rate of 50°C / h for heat preservation for 2h, 4h, 6h, 8h, and 10h, and temper at a certain cooling rate of 50°C / h to cool to room temperature. The Charpy V-port room temperature impact test was carried out, and the test data obtained are shown in Table 2:

[0033] Table 2. Impact test data of ...

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Abstract

The invention belongs to the field of steel heat treatment, and more specifically relates to a tempering technology of G18CrMo2-6 steel. The tempering technology is capable of solving a problem that impact toughness of G18CrMo2-6 steel is poor, and changes under different tempering treatment conditions. The tempering technology comprises following specific steps: 1) the G18CrMo2-6 steel after normalizing heat treatment is heated to a temperature smaller than Ac1 at a certain heating speed, and is subjected to tempering treatment after different heat preservation periods; and then charpy V-notch impact test is performed so as to obtain test data; 2) the test data is input into a tempering parameter formula for calculation, and a tempering parameter-impact value corresponding curve is drawn; and 3) a reasonable heat treatment technology is determined based on the optimum value in the tempering parameter curve. According to the tempering technology, the heat treatment technology is determined based on the tempering parameter formula of G18CrMo2-6 steel, so that design errors are avoided, the design of the tempering technology is more reasonable, and designed results are scientific and standard.

Description

technical field [0001] The invention relates to the field of iron and steel heat treatment, specifically a tempering process for G18CrMo2-6 steel. When formulating the tempering heat treatment process, the method for determining the tempering heating rate, holding temperature, holding time, and cooling rate is used to make the G18CrMo2-6 steel The impact toughness is the best in different processes. Background technique [0002] G18CrMo2-6 steel is a structural steel with high strength, high plasticity and high toughness. It is one of the commonly used steels for pressure vessels. It is widely used in the manufacture of boilers, steam turbines and gas turbine castings in thermal power plants, such as steam turbine main steam valves and cylinders. , partitions and boiler valve casings, etc. [0003] G18CrMo2-6 steel has low carbon content, low alloy content, and poor hardenability. After austenitization, the structure obtained under normalizing conditions is ferrite + bainit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D11/00C21D6/00C21D1/28
Inventor 李振江肖纳敏李殿中彭凡张瑞雪谢永祥
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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