Seamless steel tube for nuclear power equipment and preparation method of seamless steel tube

A technology for seamless steel pipes and equipment, applied in the field of seamless steel pipes for nuclear power equipment and its preparation, can solve the problems of general performance and performance needs to be improved, and achieve good wear resistance, save manpower and cost, and shorten the production cycle

Inactive Publication Date: 2018-09-04
ZHANGJIAGANG FREE TRADE ZONE HENGLONG STEEL TUBE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Technical problem to be solved: Aiming at the shortcomings of existing seamless steel pipes for nuclear power equipment, such as general performance at high temperature and performance to be improved, the present invention provides a seamless steel pipe for nuclear power equipment and its preparation method. It has good mechanical properties at low temperature and normal temperature, which can better meet the use of nuclear power equipment

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for preparing seamless steel pipes for nuclear power equipment, the preparation steps of the method are as follows:

[0020] The first step: make a cylindrical tube blank, the tube blank is composed of C: 1.5 parts, Si: 1.9 parts, Mn: 4.5 parts, Pb: 0.1 parts, Bi: 0.1 parts, Nb: 0.2 parts, Re: 6 parts, P : 0.06 parts, Fe: 950 parts of these components;

[0021] Step 2: put the tube billet into the ring furnace for heating, the temperature of the ring heating furnace is 1280°C, the starting rolling temperature is 1200°C, the final rolling temperature is 960°C, and the tension reducing temperature is 970°C;

[0022] Step 3: Perform low-temperature tempering treatment, heat preservation at 250° C. for 2 hours, and then cool naturally to obtain seamless steel pipes for nuclear power equipment.

Embodiment 2

[0024] A method for preparing seamless steel pipes for nuclear power equipment, the preparation steps of the method are as follows:

[0025] The first step: make a cylindrical tube blank, the tube blank is composed of C: 3.3 parts, Si: 4.2 parts, Mn: 8.5 parts, Pb: 0.2 parts, Bi: 0.2 parts, Nb: 0.4 parts, Re: 12 parts, P : 0.15 parts, Fe: 1100 parts of these components;

[0026] Step 2: put the tube billet into the ring furnace for heating, the temperature of the ring heating furnace is 1300°C, the rolling start temperature is 1130°C, the final rolling temperature is 980°C, and the tension reducing temperature is 970°C;

[0027] Step 3: Perform low-temperature tempering treatment, keep warm at a temperature of 300°C for 3 hours, and then cool naturally to obtain seamless steel pipes for nuclear power equipment.

Embodiment 3

[0029] A method for preparing seamless steel pipes for nuclear power equipment, the preparation steps of the method are as follows:

[0030] The first step: make a cylindrical tube blank, the tube blank is composed of C: 1.8 parts, Si: 2.3 parts, Mn: 6 parts, Pb: 0.12 parts, Bi: 0.13 parts, Nb: 0.23 parts, Re: 8 parts, P : 0.09 parts, Fe: 980 parts of these components;

[0031] Step 2: put the tube billet into the ring furnace for heating, the temperature of the ring heating furnace is 1290°C, the starting rolling temperature is 1215°C, the final rolling temperature is 970°C, and the tension reducing temperature is 970°C;

[0032] Step 3: Perform low-temperature tempering treatment, heat preservation at 270° C. for 2.5 hours, and then cool naturally to obtain seamless steel pipes for nuclear power equipment.

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Abstract

The invention relates to a seamless steel tube for nuclear power equipment and a preparation method of the seamless steel tube. The seamless steel tube comprises the following compositions of, by mass, 1.5-3.3 parts of C, 1.9-4.2 parts of Si, 4.5-8.5 parts of Mn, 0.1-0.2 part of Pb, 0.1-0.2 part of Bi, 0.2-0.4 part of Nb, 6-12 parts of Re, 0.06-0.15 part of P and 950-1100 parts of Fe. According tothe provided seamless steel tube, the technical requirements for the seamless steel tube for a third generation nuclear power plant unit can be met, the performance of the seamless steel tube is higher than the performance of a conventional seamless steel tube, the excellent yield strength, tensile performance, toughness performance and impact performance are achieved at the low temperature, hightemperature and normal temperature, the quite good abrasion resistance is achieved, and the service life of the steel tube is long.

Description

technical field [0001] The invention relates to the technical field of seamless steel pipes, in particular to a seamless steel pipe for nuclear power equipment and a preparation method thereof. Background technique [0002] Nuclear power equipment is the component equipment of nuclear power plants, which are mainly divided into three categories: nuclear island equipment, conventional island equipment, and auxiliary systems. Indispensable to make up these devices are seamless steel pipes. Nuclear power equipment has high requirements for seamless steel pipes, which require excellent strength, toughness, good mechanical properties, impact properties at room temperature, and good tensile properties at high temperatures. [0003] Although the existing seamless steel pipes for nuclear power equipment on the market can meet the above conventional requirements, their performance needs to be improved, and they cannot cope well with normal use under high and low temperature conditio...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/60C22C38/12C22C37/10C21D8/10C21D1/18
Inventor 程锡铭
Owner ZHANGJIAGANG FREE TRADE ZONE HENGLONG STEEL TUBE
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