HYDROGEN-INDUCED-CRACKING-RESISTANT PRESSURE VESSEL STEEL PLATE WITH THICKNESS GREATER THAN 200-250 MM AND MANUFACTURING METHOD THEREFOR - JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD

Title:

HYDROGEN-INDUCED-CRACKING-RESISTANT PRESSURE VESSEL STEEL PLATE WITH THICKNESS GREATER THAN 200-250 MM AND MANUFACTURING METHOD THEREFOR

Document Type and Number:

WIPO Patent Application WO/2022/205939

Kind Code:

A1

Abstract:

A hydrogen-induced-cracking-resistant pressure vessel steel plate with a thickness greater than 200-250 mm. The steel plate contains the following chemical components: C: 0.10-0.20%, Si: 0.15-0.40%, Mn: 0.95-1.35%, P: ≤0.005%, S: ≤0.0008%, Cr: 0.10-0.30%, Ni: 0.25-0.40%, Mo: 0.08-0.12%, Alt: 0.02-0.05%, Nb: 0.01-0.02%, V: 0.01-0.03%, Ti: 0.01-0.02%, and B: ≤0.0005%, with the balance being Fe and inevitable impurity elements. In addition, the chemical components satisfy the carbon equivalent Ceq being less than or equal to 0.45%, and Ceq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15. By using high-temperature diffusion heating, high-permeability rolling and normalization + accelerated cooling with water + tempering heat treatment processes, optimal matching of the mechanical properties of a large-thickness hydrogen-induced-cracking-resistant pressure vessel steel plate is realized, and the internal quality and hydrogen-induced-cracking resistance of the steel plate are greatly improved.

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Inventors:

LIU HAIKUAN (CN)
BAI YUN (CN)
LUO YUANDONG (CN)
MIAO PIFENG (CN)
YE JIANJUN (CN)
ZHANG JIAN (CN)
YUN PENGCHENG (CN)
YU XINYUN (CN)
XU JUN (CN)

Application Number:

PCT/CN2021/131773

Publication Date:

October 06, 2022

Filing Date:

November 19, 2021

Export Citation:

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Assignee:

JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD (CN)

International Classes:

C21D8/02; C21D1/18; C22C38/46; C22C38/50

Domestic Patent References:

WO2020111858A1

2020-06-04

Foreign References:

CN113278878A	2021-08-20
CN106086642A	2016-11-09
CN101289728A	2008-10-22
CN105886909A	2016-08-24
JPH05287441A	1993-11-02
JP2019504210A	2019-02-14
CN110923570A	2020-03-27

Attorney, Agent or Firm:

JIANGYIN QING ZHOU PATENT AGENCY (GENERAL PARTNERSHIP) (CN)

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