Method for preparing steel plate used in extremely low temperature environment

An extremely low-temperature, environment-friendly technology, applied in the field of steel plate preparation, can solve the problems of unsatisfactory strength and toughness and impact energy, achieve good welding adaptability, and improve the effect of low-temperature impact toughness

Inactive Publication Date: 2014-05-14
锡山区鹅湖慧盾机械厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it has been improved compared with the existing technology, its strength, toughness and impact energy still cannot meet the use requirements of some extremely low temperature occasions, so it is still necessary to improve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A method for preparing a steel plate used in an extremely low temperature environment. The chemical composition of the steel consists of the following components in weight percentage: C: 0.03, Si: 0.30, Mn: 1.60, Ti: 0.030, Nb: 0.2, Cr: 1.2, Ni: 1.3, N: 0.05, S≤0.008, P≤0.005, the balance is Fe and unavoidable impurities; the preparation method includes the following steps:

[0014] 1) Converter smelting + refining outside the furnace, adjust the chemical composition, meet the above range, and pour;

[0015] 2) Heat the billet to 1230°C, and ensure the soaking time of the billet for 2 hours; then carry out two-stage rolling, the rolling temperature range of the first stage is 1000-1160°C, and the rolling temperature range of the second stage is 820-970°C ℃;

[0016] 3) Heat treatment process: first quenching, the quenching temperature is 960 ° C, water quenching, and then put the steel plate into liquid nitrogen for cryogenic treatment, the treatment time in liquid nit...

Embodiment 2

[0018] A method for preparing a steel plate used in an extremely low temperature environment. The chemical composition of the steel consists of the following components in weight percentage: C: 0.05, Si: 0.10, Mn: 1.80, Ti: 0.010, Nb: 0.4, Cr: 0.8, Ni: 1.5, N: 0.03, S≤0.008, P≤0.005, the balance being Fe and unavoidable impurities; the preparation method includes the following steps:

[0019] 1) Converter smelting + refining outside the furnace, adjust the chemical composition, meet the above range, and pour;

[0020] 2) Heat the billet to 1250°C, and ensure the soaking time of the billet for 1 hour; then carry out two-stage rolling, the rolling temperature range of the first stage is 1000-1160°C, and the rolling temperature range of the second stage is 820-970°C ℃;

[0021] 3) Heat treatment process: first quenching, the quenching temperature is 970 ° C, water quenching, and then put the steel plate into liquid nitrogen for cryogenic treatment, the treatment time in liquid n...

Embodiment 3

[0023] A method for preparing a steel plate used in an extremely low temperature environment. The chemical composition of the steel consists of the following components in weight percentage: C: 0.04, Si: 0.20, Mn: 1.70, Ti: 0.020, Nb: 0.3, Cr: 1.0, Ni: 1.4, N: 0.04, S≤0.008, P≤0.005, the balance is Fe and unavoidable impurities; the preparation method includes the following steps:

[0024] 1) Converter smelting + refining outside the furnace, adjust the chemical composition, meet the above range, and pour;

[0025] 2) Heat the billet to 1240°C, and ensure the soaking time of the billet for 1.5 hours; then carry out two-stage rolling, the rolling temperature range of the first stage is 1000-1160°C, and the rolling temperature range of the second stage is 820-970°C ℃;

[0026] 3) Heat treatment process: first quenching, the quenching temperature is 965 ° C, water quenching, and then put the steel plate into liquid nitrogen for cryogenic treatment, the treatment time in liquid n...

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Abstract

The invention discloses a method for preparing a steel plate used in an extremely low temperature environment. The preparation method comprises the following steps: 1) carrying out converter smelting and external refining, and then pouring; 2) heating a steel billet to 1230-1250 DEG C, soaking the steel billet for 1-2 hours, and then rolling at two stages, wherein the rolling temperature interval of the first stage is 1000-1160 DEG C, and the rolling temperature interval of the second stage is 820-970 DEG C; 3) carrying out a heat treatment technology, namely firstly, quenching at the quenching temperature of 960-970 DEG C, carrying out water quenching, and then putting a steel plate into liquid nitrogen to carry out cryogenic treatment, wherein the treatment time in the liquid nitrogen is 10-20 minutes; carrying out tempering treatment, wherein the tempering heating temperature is 260-280 DEG C, and the insulation time is 1-2 hours.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for preparing a steel plate used in an extremely low temperature environment. Background technique [0002] At present, there are few types of high-strength steel plates used in low-temperature environments in China, and most of them are limited to low-temperature containers. In other low-temperature environments, high-strength steel plates with excellent performance that can be used in low-temperature environments are also required. There are three difficulties in the research and development of domestic steel plates for low temperature use. First, the ambient temperature of steel plates is getting lower and lower, from -20°C to -60°C; second, the strength of steel plates is getting higher and higher, and the tensile strength has increased from 40Kg to 60Kg level; third, the impact toughness requirements are getting higher and higher, from the nationa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C21D8/02
Inventor 诸金平
Owner 锡山区鹅湖慧盾机械厂
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