LOW-COST SMELTING METHOD FOR POLAR-USE STEEL USING ULTRA-HIGH PHOSPHORUS MOLTEN IRON

WIPO Patent Application WO/2022/236900

A1

A low-cost smelting method for polar-use steel using ultra-high phosphorus molten iron, the method sequentially comprising the following steps: a converter smelting step: performing smelting, deoxidizing and steel alloying on raw materials comprising molten iron; an LF refining step: performing slag conditioning and refining on the molten steel obtained in the converter smelting step to obtain a refined molten steel; an RH degassing step: performing vacuum degassing on the refined molten steel; and a continuous casting step: performing continuous casting on the molten steel obtained after the RH degassing step to obtain a cast blank. In the present invention, zone-differentiated single and double-slag-zone smelting is carried out on the basis of molten iron Si content, greatly conserving raw material consumption during smelting, shortening the smelting period, and accelerating the production process.

JP4515429

Steel material with excellent toughness and brittleness crack stopping characteristics of weld heat affected zone and its manufacturing method

MA HENG (CN)
HE KANG (CN)
WANG ZHONGXUE (CN)
WANG TENGFEI (CN)
ZOU WENPENG (CN)
DU CHUANZHI (CN)
CHEN AIJIAO (CN)
ZHANG PEI (CN)
NING WEI (CN)
WANG YUEXIANG (CN)

PCT/CN2021/098736

November 17, 2022

June 07, 2021

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LAIWU STEEL YINSHAN SECTION CO LTD (CN)

C21C7/06; C21C5/36; C21C7/00; C21C7/064; C21C7/072; C21C7/10

CN112048665A	2020-12-08
CN106884067A	2017-06-23
CN109280731A	2019-01-29
CN111363889A	2020-07-03
CN109593907A	2019-04-09
CN109778054A	2019-05-21
CN109593907A	2019-04-09
CN109897933A	2019-06-18
CN109402323A	2019-03-01

See also references of EP 4215627A4

BEIJING WUZHOUYANGHE & PARTNERS (CN)

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