NI-SAVING LOW-TEMPERATURE STEEL SUBMERGED-ARC WELDING WIRE FOR CRYOGENIC ENVIRONMENT, AND WELDING PROCESS

WIPO Patent Application WO/2021/237843

A1

A Ni-saving low-temperature steel submerged-arc welding wire for a cryogenic environment, and a welding process, relating to the technical field of iron and steel smelting. The Ni-saving low-temperature steel submerged-arc welding wire comprises, in mass percent, the following chemical components: C: 0.01%-0.10%, Mn: 2.0%-4.5%, Si: 0.10%-0.20%, S≤0.01%, P≤0.02%, Ni: 9.0%-15.0%, Cr: 10.0%-16.0%, Mo≤0.01%, V≤0.01%, and the balance of Fe and inevitable impurities. A reasonable welding process and matching welding materials ensure that the tensile strength Rm of a welded joint is larger than or equal to 530 MPa, the impact energy KV2 of a weld seam and a heat affected zone at -101℃ is larger than or equal to 34 J, the side bending d of the welded joint is equal to 4a, qualification is achieved at 180℃, and the welded joint has excellent mechanical comprehensive performance.

LI HENGKUN (CN)
WANG JINGJIE (CN)
ZHAO JINBIN (CN)
QIU BAOWEN (CN)
CHE MAJUN (CN)
ZHANG XIAOXUE (CN)
YIN YUQUN (CN)
CHEN LINHENG (CN)

PCT/CN2020/097644

December 02, 2021

June 23, 2020

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NANJING IRON & STEEL CO LTD (CN)

B23K35/30; B23K9/18; B23K9/235

CN102554507A	2012-07-11
CN101862887A	2010-10-20
CN1651181A	2005-08-10
CN104722949A	2015-06-24
CN108637525A	2018-10-12
JPS5213441A	1977-02-01
JPS589790A	1983-01-20

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

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