Rare earth treatment Low -cost high toughness Low -temperature pressure vessel steel plate and its production method

A pressure vessel, low-cost technology, applied in the field of rare earth treatment of low-cost high-toughness low-temperature pressure vessel steel plate and its production, can solve the problems of complex production process, high equipment requirements, high production cost, etc., to solve the problem of unstable performance and avoid aggregation Effect of growth and improvement of low temperature toughness

Active Publication Date: 2022-08-05
新余钢铁股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this patent can meet the toughness requirements at -80°C, its disadvantage is that Ni, Cr, Nb, V and other alloying elements are added at the same time, and the cost of the alloy is too high
[0008] At present, the main problems of low-temperature pressure vessel steel plates are: high alloy cost: there are many kinds of precious alloys added, and the alloy content is large; Unable to meet usage requirements

Method used

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  • Rare earth treatment Low -cost high toughness Low -temperature pressure vessel steel plate and its production method
  • Rare earth treatment Low -cost high toughness Low -temperature pressure vessel steel plate and its production method
  • Rare earth treatment Low -cost high toughness Low -temperature pressure vessel steel plate and its production method

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Embodiment 1

[0034] The production method of low-cost, high-toughness, low-temperature pressure vessel steel plate treated with rare earth includes the following steps:

[0035] 1) Converter smelting. Oxygen smelting with top and bottom blowing is adopted, and the C content at the end point is controlled to be 0.04%, S≤0.020%, P≤0.015%, and the slag retaining ball is used for tapping. When the tapping reaches 1 / 4 and 1 / 2, according to batches Limestone and fluorite slag are added for washing, and the amount added in each batch is 1 / 2 of the total amount of slag, and aluminum alloy is added for deoxidation, requiring Als ≥ 0.020%;

[0036] 2) LF refining. In the early stage of refining, the composition is adjusted and the Nb and Ti are micro-alloyed. The present invention is a micro-alloyed steel. Nb and Ti are important micro-alloying elements, which form carbides and carbonitrides of Nb and Ti in the steel, which are steel the main toughness phase. At the same time, the oxygen content ...

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Abstract

The rare earth-treated low-cost, high-toughness, low-temperature pressure vessel steel plate and a production method thereof provided by the invention are composed of: C0.10-0.16%, Mn1.20-1.60%, Si0.20-0.50%, P≤0.020%, S ≤0.005%, Nb: 0.015-0.025%, Ti: 0.010-0.020%, Alt: 0.020-0.040%, La+Ce: 0.0020-0.0040%, O≤20ppm, the rest are Fe and inevitable inclusions. The low temperature toughness of steel is further improved by microalloying elements Nb, Ti and trace rare earth alloys. The rare earth steel is produced by strictly controlling the content of O and S in the molten steel. In the later stage of smelting, the Ca content in the molten steel is kept at a high level by calcium treatment. Stability issue.

Description

technical field [0001] The invention belongs to a pressure vessel steel plate and a manufacturing method thereof, and particularly relates to a rare earth treated low-cost, high-toughness, low-temperature pressure vessel steel plate and a manufacturing method thereof. Background technique [0002] Steel plates for pressure vessels are specially used for the manufacture of petroleum, chemical, gas separation and storage and transportation vessels or other equipment. With the rapid development of the national economy, the petrochemical industry has more and more requirements for the strength, plasticity and toughness of pressure vessel steel. The higher it is, especially the higher requirements are placed on the low temperature toughness of the pressure vessel steel. [0003] In order to overcome the increasingly severe low-temperature service conditions, the current commonly used method is to add expensive Ni alloys. In "GB3531-2014 Steel Plates for Low-Temperature Pressure V...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C33/04C21D8/02
CPCC22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/005C22C33/04C21D8/0205C21D8/0226C21D8/0247
Inventor 李声延孙乐飞吕瑞国冯小明刘小林董富军郭文波吕继平廖桑桑熊雄潘津朱勇宽熊文名付清霞刘志芳杨帆
Owner 新余钢铁股份有限公司
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