A 200mm thick hydrogen-induced cracking resistant pressure vessel steel plate and its manufacturing method

A technology for anti-hydrogen cracking and pressure vessels, which is applied in the field of steel plate manufacturing, can solve problems such as not being able to meet the needs of large-scale, and achieve the effects of reducing banded structures, refining grains, and improving strength

Active Publication Date: 2018-02-23
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few patents related to the hydrogen-induced cracking-resistant pressure vessel steel used in the wet hydrogen sulfide environment. Pressure vessel steel plate, through Ni, Mo alloying and subsequent normalizing + water accelerated cooling + tempering heat treatment to obtain bainite structure, to improve the strength of the steel plate and replace the low-strength grade hydrogen-induced cracking resistant steel plate, but the maximum thickness of the steel plate is only 130mm, still cannot meet the needs of large-scale petrochemical project engineering equipment

Method used

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  • A 200mm thick hydrogen-induced cracking resistant pressure vessel steel plate and its manufacturing method
  • A 200mm thick hydrogen-induced cracking resistant pressure vessel steel plate and its manufacturing method
  • A 200mm thick hydrogen-induced cracking resistant pressure vessel steel plate and its manufacturing method

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Experimental program
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Effect test

Embodiment 1

[0029]The thickness of the hydrogen-induced cracking-resistant pressure vessel steel plate in this embodiment is 200mm, and its chemical composition is calculated by weight percentage: C: 0.18%, Si: 0.30%, Mn: 1.17%, P: 0.003%, S: 0.0005%, H: 0.00006%, O: 0.0012%, N: 0.0040%, Cr: 0.20%, Ni: 0.25%, Nb: 0.005%, V: 0.003%, Ti: ≤0.002%, B: ≤0.0001%, and the balance is Fe and inevitable impurity elements.

[0030] The manufacturing process of the steel plate is as follows:

[0031] 1) Smelting process

[0032] The smelting raw materials are self-produced scrap steel and high-quality pig iron, and slag removal treatment is carried out after electric furnace smelting and LF smelting. Strictly control S≤0.001%, P≤0.006%, A, B, C, D and Ds non-metallic inclusions The individual items of the species are ≤ grade 1.0, and the sum of them is ≤ grade 3.5; low superheated argon gas protection is used for pouring, and the superheated degree of molten steel is 32°C during pouring. After the...

Embodiment 2

[0040] The thickness of the hydrogen-induced cracking-resistant pressure vessel steel plate in this embodiment is 200mm, and its chemical composition is calculated by weight percentage: C: 0.18%, Si: 0.28%, Mn: 1.18%, P: 0.004%, S: 0.0006%, H: 0.00006%, O: 0.0013%, N: 0.0042%, Cr: 0.21%, Ni: 0.28%, Nb: ≤0.006%, V: ≤0.004%, Ti: ≤0.003%, B: ≤0.0001%, remainder The amount is Fe and unavoidable impurity elements.

[0041] The manufacturing process of the steel plate is:

[0042] 1) Smelting process

[0043] The smelting raw materials are self-produced scrap steel and high-quality pig iron, and slag removal treatment is carried out after electric furnace smelting and LF smelting. Strictly control S≤0.001%, P≤0.006%, A, B, C, D and Ds non-metallic inclusions The individual items of the species are ≤ grade 1.0, and the sum of them is ≤ grade 3.5; low superheated argon gas protection is used for pouring, and the superheated degree of molten steel is 30°C during pouring. After the s...

Embodiment 3

[0051] The thickness of the hydrogen-induced cracking-resistant pressure vessel steel plate in this embodiment is 200mm, and its chemical composition is calculated by weight percentage: C: 0.18%, Si: 0.26%, Mn: 1.16%, P: 0.005%, S: 0.0007%, H: 0.00005%, O: 0.0010%, N: 0.0038%, Cr: 0.22%, Ni: 30%, Nb: ≤0.006%, V: ≤0.004%, Ti: ≤0.002%, B: ≤0.0003%, remainder The amount is Fe and unavoidable impurity elements.

[0052] The manufacturing process of the steel plate is as follows:

[0053] 1) Smelting process

[0054] The smelting raw materials are self-produced scrap steel and high-quality pig iron, and slag removal treatment is carried out after electric furnace smelting and LF smelting. Strictly control S≤0.001%, P≤0.006%, A, B, C, D and Ds non-metallic inclusions The individual items of the species are ≤ grade 1.0, and the sum of them is ≤ grade 3.5; low superheated argon gas protection is used for pouring, and the superheated degree of molten steel is 30°C during pouring. Af...

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Abstract

A 200 mm-thick pressure vessel steel plate resistant against hydrogen-induced cracking and manufacturing method thereof. The following lists the weight percentage of the chemical composition of the steel plate:0.15-0.20% of C, 0.20-0.40% of Si, 1.05-1.20% of Mn, ≤ 0.006% of P, ≤ 0.001% of S, 0.15-0.25% of Cr, 0.15-0.35% of Ni, ≤ 0.01% of Nb, ≤ 0.01% of V, ≤ 0.01% of Ti, ≤ 0.0005% of B, and a remainder of Fe and unavoidable impurities. An ingot mold casting process is used. The process comprises the steps: electric furnace → LF refining → VD refining → mold casting → steel ingot annealing → steel ingot heating → steel ingot rolling → steel plate annealing → defect detection → normalizing + water accelerated cooling → tempering → finishing → inspection → warehousing. The steel plate is provided with excellent mechanical performance and resistance against hydrogen-induced cracking. The strength and low temperature impact toughness of the steel plate are not significant reduced after a high temperature simulated post-weld heat treatment.

Description

technical field [0001] The invention belongs to the field of steel plate manufacturing, and in particular relates to a 200mm-thick SA516Gr70 (HIC) hydrogen-induced cracking-resistant pressure vessel steel plate and a manufacturing method thereof. Background technique [0002] SA516Gr70 (HIC) steel plate is the main metal material used in the environment of wet hydrogen sulfide (containing gas phase or dissolved in liquid phase water, regardless of whether there is hydrogen in the acidic process environment) environment in the petrochemical industry. Hydrogen-induced cracking (HIC) is one of the main forms of equipment damage caused by wet hydrogen sulfide environments. Once the pressure vessel fails, it will cause huge economic losses. It is also one of the most prominent corrosion problems and technical problems in the current oil extraction, oil refining, chemical industry, and gas production, which seriously plagues the safe operation of production equipment in petrochemi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/18C22C38/08C22C38/12C22C38/14C22C38/32C21D8/02C21D1/28C21D1/18
CPCC22C38/02C22C38/04
Inventor 李经涛刘海宽高助忠张建恽鹏程张军
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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