Flux-cored welding strip and welding flux used in combination for submerged arc welding of duplex stainless steel, and preparation methods and use thereof

US12343819B2 · kind B2 · utility

Assignee

• HARBIN WELDING INSTITUTE LIMITED COMPANY · CN

Inventors

• Kai Xu · Tempe, US
• Pengbo Wu · Jingwei, CN
• Xiao Guo · Jingwei, CN
• Wei Feng · Jingwei, CN
• Shubin Huo · Jingwei, CN
• Shaowei Chen · Santa Cruz, US
• Bo Chen · Katy, US
• Hanmin Wu · Jingwei, CN
• Yiming Ma · Shanghai, CN
• Laibo Sun · Jingwei, CN
• Chao Wei · Jingwei, CN
• Naiwen Fang · Jingwei, CN

Key dates

• Filing date: Sep 23, 2024
• Grant date: Jul 1, 2025
• Expiry date: Sep 23, 2044

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/20
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Disclosed are a flux-cored welding strip and a welding flux used in combination for submerged arc welding of a duplex stainless steel, and preparation methods and use thereof. 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.