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Ultra-thick high temperature-resistant steel for pressure vessel and preparation method thereof

A technology for pressure vessels and high temperature resistance, applied in temperature control, metal rolling, manufacturing tools, etc., can solve the problems of high alloy content, poor welding performance, high carbon equivalent, etc., and achieve good heat strength and large rolling process window , the effect of high production efficiency

Active Publication Date: 2011-06-15
LAIWU STEEL YINSHAN SECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high carbon content and alloy content in the composition design of this invention, the carbon equivalent is high, and the welding performance of the material is poor during use.

Method used

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  • Ultra-thick high temperature-resistant steel for pressure vessel and preparation method thereof
  • Ultra-thick high temperature-resistant steel for pressure vessel and preparation method thereof
  • Ultra-thick high temperature-resistant steel for pressure vessel and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] An extra-thick high-temperature-resistant pressure vessel steel, wherein the chemical composition of the steel is: C 0.10%, Si 0.25%, Mn 0.60%, Cr 0.95%, V 0.25%, Mo 0.30%, P 0.011%, S 0.005 %, the remaining content is Fe and unavoidable inclusions.

[0034] The preparation method of the above-mentioned extra-thick high-temperature-resistant pressure vessel steel is as follows: including smelting, heating, rough rolling, finish rolling, normalizing, and tempering processes, wherein the basicity of the refining slag is controlled at 3.0, and the long nozzle for ladle pouring is protected by an Ar seal. The submerged nozzle of the tundish is fully protected with Ar sealing, and the superheat of the tundish is controlled at 21°C; the billet is heated in a heating furnace with a heating temperature of 1200°C and a heating time of 4.5 hours. The steel billet comes out of the furnace, and after being descaled by the pre-descaler, it enters the rough rolling mill for rolling. ...

Embodiment 2

[0036] Steel composition is the same as in Example 1. The preparation method of the extra-thick high-temperature resistant pressure vessel steel is as follows: including smelting, heating, rough rolling, finish rolling, normalizing, and tempering processes, wherein the basicity of the refining slag is controlled at 3.5, and the long nozzle for ladle pouring is protected by an Ar seal. 1. Fully protected pouring with submerged nozzle and Ar seal in the tundish, the superheat of the tundish is controlled at 21°C; put the billet into the heating furnace for heating, the heating temperature is 1200°C, and the heating time is 4.5 hours. The steel billet comes out of the furnace, and after being descaled by the pre-descaler, it enters the rough rolling mill for rolling. The rolling temperature is 1171°C, and 6 passes of rolling are carried out. The reduction rates of each pass are: 9.47%, 7.93%, 6.84%, respectively. 13.64%, 13.27%, 11.73%, the total reduction rate is 48.7%, and the ...

Embodiment 3

[0038] An extra-thick high-temperature-resistant pressure vessel steel, wherein the chemical composition of the steel is: C 0.09%, Si 0.30%, Mn 0.55%, Cr 1.00%, V 0.0.20%, Mo 0.27%, P 0.008%, S 0.002%, the rest is Fe and unavoidable inclusions.

[0039] The preparation method of the above-mentioned extra-thick high-temperature-resistant pressure vessel steel is as follows: including smelting, heating, rough rolling, finish rolling, normalizing, and tempering processes, wherein the basicity of the refining slag is controlled at 4.5, and the long nozzle for ladle pouring is protected by an Ar seal. The submerged nozzle of the tundish is fully protected with Ar sealing, and the superheat of the tundish is controlled at 21°C; the billet is heated in a heating furnace with a heating temperature of 1200°C and a heating time of 4.5 hours. The steel billet comes out of the furnace, and after being descaled by the pre-descaler, it enters the rough rolling mill for rolling. The rolling ...

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Abstract

The invention relates to an ultra-thick high temperature-resistant steel for a pressure vessel and a preparation method thereof. After smelting and refining, the steel is subjected to continuous casting, hot rolling, normalizing and tempering. The steel comprises the following controlled chemical components in percentage by mass: 0.08-0.15% of C, 0.15-0.40% of Si, 0.40-0.70% of Mn, 0.90-1.20% of Cr, 0.15-0.30% of V, 0.25-0.35% of Mo, at most 0.025% of P, at most 0.010% of S and the balance of Fe and inevitable inclusions. The preparation method provided by the invention comprises the steps of smelting, heating, rough rolling, finish rolling, normalizing and tempering. The invention has the characteristics of appropriate design and proportion of the chemical components, simple manufacturing process, large thickness dimension (80mm), good heat resistance, stable product performance and the like.

Description

technical field [0001] The invention relates to an extra-thick high-temperature-resistant pressure vessel steel and a preparation method thereof, belonging to the field of low-alloy pressure vessel manufacture. Background technique [0002] Pressure vessel steel has a wide range of uses and is widely used in petroleum, chemical, power station, boiler and other industries. Because the pressure vessel bears a certain pressure, is at different temperatures, contacts with different media, and has harsh service conditions, the requirements for steel are relatively strict, and the internal quality requirements for steel are relatively high. In addition to performance, it is still necessary to test the impact of aging and conduct flaw detection on all steel plates, and a good surface is required. For steel grades used in high temperature resistant containers, it is necessary to test the medium and high temperature strength, and even the high temperature durable strength and creep ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/24C22C38/60B21B37/16B21B37/74
Inventor 周平麻衡王建景李文钱许宝玉张长宏李海方刘军刚
Owner LAIWU STEEL YINSHAN SECTION CO LTD
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