WEATHER-RESISTANT BRIDGE STEEL AND SMELTING METHOD THEREFOR

WIPO Patent Application WO/2022/160526

A1

Disclosed are a weather-resistant bridge steel and a smelting method therefor, which relate to the technical field of iron and steel production. The weather-resistant bridge steel comprises the following chemical components in percentage by mass: C: 0.030% - 0.080%, Si: 0.10% - 0.40%, Mn: 1.50% - 1.80%, P ≤ 0.015%, S ≤ 0.0010%, Nb: 0.030% - 0.050%, V: 0.005% - 0.050%, Ti: 0.006% - 0.020%, Cr: 0.20% - 0.80%, Ni: 0.05% - 0.20%, Mo ≤ 0.05%, Cu: 0.05% - 0.20%, B ≤ 0.0005%, Al: 0.005% - 0.015%, Mg: 0.0008% - 0.0015%, N ≤ 0.0050%, and the balance being Fe and inevitable impurities. A top-bottom combined blowing converter is used for smelting, so that the inclusion size is effectively reduced by means of LF+RH refining treatment and magnesium treatment, the structure grain size is refined, the forming rate of acicular ferrite is increased, the welding performance is effectively improved, and the corrosion resistance of a steel plate is improved.

ZHAI DONGYU (CN)
FENG GUOHUI (CN)
DING YE (CN)
ZHANG YIJIE (CN)
WU JUNPING (CN)
HONG JUN (CN)
GUO JIANAN (CN)
ZHANG YUANYU (CN)

PCT/CN2021/095659

August 04, 2022

May 25, 2021

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NANJING IRON & STEEL CO LTD (CN)

C22C38/58; C21C5/35; C21C7/06; C21C7/064; C21C7/10; C22C33/06; C22C38/02; C22C38/06; C22C38/42; C22C38/44; C22C38/46; C22C38/48; C22C38/50; C22C38/54

CN112210719A	2021-01-12
CN107964624A	2018-04-27
CN112195406A	2021-01-08
CN111020397A	2020-04-17
CN109797341A	2019-05-24

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

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