Title:
LOW-YIELD-RATIO, EASY-TO-WELD AND WEATHER-PROOF BRIDGE STEEL AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/212972
Kind Code:
A1
Abstract:
A low-yield-ratio, easy-to-weld and weather-proof bridge steel and a manufacturing method therefor. The present invention comprises the following components in percentages by mass: C: 0.051-0.080%, Si: 0.20-0.50%, Mn: 1.20-1.50%, P≤0.010%, S≤0.003%, Cr: 0.30-0.60%, Ni: 0.20-0.50%, Cu: 0.20-0.50%, Mo: 0-0.20%, Nb: 0.02-0.06%, V: 0-0.070%, Ti: 0.005-0.025%, Al: 0.010-0.040%, CEV≤0.46%, Pcm≤0.20% and the balance of iron and inevitable impurities. The production method comprises the process steps of molten iron pretreatment, converter smelting, external refining, continuous casting, rolling, cooling, straightening and heat treatment, and the steel and the corresponding production process solve matching problems of technical indexes, such as high strength, low yield ratio, weather resistance and welding performance, of the bridge steel.
Inventors:
YANG YING (CN)
LIN TIANZI (CN)
ZHANG ZHE (CN)
WANG YUBO (CN)
WANG RUOGANG (CN)
LI XINLING (CN)
ZHANG TAO (CN)
JI WENBO (CN)
CHEN YIQING (CN)
HOU HUAXING (CN)
LIN TIANZI (CN)
ZHANG ZHE (CN)
WANG YUBO (CN)
WANG RUOGANG (CN)
LI XINLING (CN)
ZHANG TAO (CN)
JI WENBO (CN)
CHEN YIQING (CN)
HOU HUAXING (CN)
Application Number:
PCT/CN2022/091896
Publication Date:
November 09, 2023
Filing Date:
May 10, 2022
Export Citation:
Assignee:
ANGANG STEEL CO LTD (CN)
International Classes:
C22C38/02; B21B1/46; B21B37/58; B21B37/74; B22D11/18; C21D8/02; C22C33/04; C22C38/04; C22C38/06; C22C38/42; C22C38/44; C22C38/46; C22C38/48; C22C38/50
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Attorney, Agent or Firm:
DALIAN EAST PATENT AGENT LTD. (CN)
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