PRODUCTION METHOD FOR HIGH-NICKEL MEDIUM-THICK STEEL PLATE FOR LOW-TEMPERATURE SERVICE

WIPO Patent Application WO/2024/040762

A1

A production method for a high-nickel medium-thick steel plate for low-temperature service. The steel comprises the following components in percentage by weight: C: 0.05-0.08%; Si≤0.30%; Mn: 0.50-0.80%; P≤0.008%; S≤0.005%; Al: 0.02-0.05%; Ni: 3.0-4.0%; Sb≤0.003%; B≤0.0005%; O≤0.0015%; N≤0.0050%; H≤0.0002%; Cu+Cr+Mo≤0.08%; and Ti+Nb+V≤0.01%, with the balance being Fe and inevitable impurity elements. The key process steps comprise smelting, continuous casting, heating, rolling, cooling, surface treatment and heat treatment. According to the present invention, hot delivery and hot charging technology is used, and by controlling iron oxide scale on the surfaces of a plate blank and a steel plate, the surface quality of the obtained high-nickel steel plate for low-temperature service is good; moreover, the steel plate has excellent low-temperature toughness, and the Charpy impact absorbed energy at -100°C is greater than or equal to 60 J.

ZHOU WENHAO (CN)
YANG JIANHUA (CN)
LIU XIMAO (CN)
ZHANG CHENGYUAN (CN)
PENG NINGQI (CN)
ZHANG YONGWEI (CN)
SHI SHUHUA (CN)
CHENG HAOXUAN (CN)
LUO SONGYUN (CN)
DING XINGYAN (CN)
CHEN ZHIBIN (CN)
GE JINJING (CN)

PCT/CN2022/132527

February 29, 2024

November 17, 2022

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HUNAN VALIN XIANGTAN IRON & STEEL CO LTD (CN)

C22C33/04; C21D6/00; C21D8/02; C22C38/08

CN105441798A	2016-03-30
CN103320707A	2013-09-25
CN106676402A	2017-05-17
DE2945164A1	1981-05-14
JPS59232225A	1984-12-27

CHANGSHA XINYU INTELLECTUAL PROPERTY AGENCY CO. LTD (CN)

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