US 12,343,819 B2
Flux-cored welding strip and welding flux used in combination for submerged arc welding of duplex stainless steel, and preparation methods and use thereof
Kai Xu, Harbin (CN); Pengbo Wu, Harbin (CN); Xiao Guo, Harbin (CN); Wei Feng, Harbin (CN); Shubin Huo, Harbin (CN); Shaowei Chen, Harbin (CN); Bo Chen, Harbin (CN); Hanmin Wu, Harbin (CN); Yiming Ma, Harbin (CN); Laibo Sun, Harbin (CN); Chao Wei, Harbin (CN); and Naiwen Fang, Harbin (CN)
Assigned to HARBIN WELDING INSTITUTE LIMITED COMPANY, Harbin (CN)
Filed by HARBIN WELDING INSTITUTE LIMITED COMPANY, Harbin (CN)
Filed on Sep. 23, 2024, as Appl. No. 18/893,935.
Application 18/893,935 is a continuation of application No. PCT/CN2023/134529, filed on Nov. 28, 2023.
Claims priority of application No. 202310072834.2 (CN), filed on Feb. 7, 2023.
Prior Publication US 2025/0010410 A1, Jan. 9, 2025
Int. Cl. B23K 35/02 (2006.01); B23K 9/18 (2006.01); B23K 35/30 (2006.01); B23K 35/36 (2006.01); B23K 35/362 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/48 (2006.01); C22C 38/58 (2006.01)
CPC B23K 35/0266 (2013.01) [B23K 9/186 (2013.01); B23K 35/3086 (2013.01); B23K 35/3602 (2013.01); B23K 35/362 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/48 (2013.01); C22C 38/58 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A flux-cored welding strip and a welding flux used in combination for submerged arc welding of a duplex stainless steel, wherein
the flux-cored welding strip is composed of a stainless steel shell and a flux core powder, the flux core powder consisting of the following components: in percentages by mass, ferrochrome nitride: 0.70% to 1.0%, a chromium powder: 26% to 27%, a nickel powder: 4.5% to 5.5%, a molybdenum powder: 3.7% to 4.2%, a manganese powder: 2.55% to 2.65%, a copper powder: 1.45% to 1.55%, a ferrosilicon powder: 1.1% to 1.2%, a tungsten powder: 1.0% to 1.15%, a niobium powder: 0.25% to 0.35%, an aluminum powder: 0.35% to 0.55%, a rhenium powder: 0.35% to 0.40%, a lanthanum powder: 0.1% to 0.15%, and a balance being an iron powder; and
the welding flux consists of the following components: in percentages by mass, bauxite: 20% to 25%, a clay: 5% to 10%, a zircon sand: 10% to 15%, a magnesite clinker: 10% to 15%, fluorite: 25% to 30%, an alloying agent: 1.5% to 2%, and a balance being chromium oxide green.