LOW-YIELD-RATIO HIGH-TOUGHNESS Q500QE BRIDGE STEEL AND PRODUCTION METHOD THEREOF

Title:

LOW-YIELD-RATIO HIGH-TOUGHNESS Q500QE BRIDGE STEEL AND PRODUCTION METHOD THEREOF

Document Type and Number:

WIPO Patent Application WO/2023/071079

Kind Code:

A1

Abstract:

The present invention relates to the technical field of steel production. Disclosed are a low-yield-ratio high-toughness Q500qE bridge steel and a production method thereof. The bridge steel comprises the following chemical components in percentage by mass: 0.04%-0.07% of C, 0.15%-0.25% of Si, 1.40%-1.55% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.03%-0.05% of Nb, 0.008%-0.02% of Ti, 0.020%-0.040% of Alt, 0.10%-0.20% of Cu, 0.20%-0.30% of Ni, 0.25%-0.40% of Cr, 0.10%-0.20% of Mo, 0.38%-0.45% of carbon equivalent (CEV), a welding crack sensitivity coefficient Pcm being 0.15%-0.23%, and the balance of Fe and a small amount of unavoidable impurities. The steel having a thickness specification of 10-60 mm is obtained by using the TMCP and tempering process, a metallographic structure using bainite and ferrite as main components is obtained, and good matching of high strength, low yield ratio and high low-temperature toughness is achieved.

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Inventors:

JIANG SHAN (CN)
ZENG ZHOUYU (CN)
DANG JUN (CN)
CUI QIANG (CN)
WANG GUANGLEI (CN)
LI DONGHUI (CN)
DING YE (CN)

Application Number:

PCT/CN2022/087569

Publication Date:

May 04, 2023

Filing Date:

April 19, 2022

Export Citation:

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Assignee:

NANJING IRON & STEEL CO LTD (CN)

International Classes:

C22C38/02; C22C33/04; C22C38/04; C22C38/06; C22C38/42; C22C38/44; C22C38/48; C22C38/50; C22C38/58

Foreign References:

CN114182165A	2022-03-15
CN105063509A	2015-11-18
CN105018856A	2015-11-04
JP2000054064A	2000-02-22
CN108624744A	2018-10-09
CN111118401A	2020-05-08
CN105779883A	2016-07-20

Attorney, Agent or Firm:

NANJING LI&FENG INTELLECTUAL PROPERTY AGENCY (SPECIAL GENERAL PARTNERSHIP) (CN)

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