Flux cored wire for dual phase stainless steel

US6620261B2 · kind B2 · utility

Inventors

• Jong Won Kim · Gerolzhofen, DE
• Sunil Lee · Buk-myeon, KR

Key dates

• Filing date: Jul 27, 2001
• Grant date: Sep 16, 2003
• Expiry date: Jul 27, 2021

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B23K35/0266
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

Flux cored wire for dual stainless steel having flux filled into a stainless steel sheath of the invention, the flux contains, with respect to the total weight of the wire: 0.02 to 0.10 wt % C; 0.10 to 1.0 wt % Si; 1.0 to 3.0 wt % Mn, 15 to 35 wt % Cr, 7.0 to 12.0 wt % Ni; 1.5 to 3.5 wt % Mo, 0.02 to 0.2 wt % N; 0.02 to 0.2 wt % Nb; and 0.5 to 5.6 wt % slag forming agent. The components composing the flux cored wire satisfy the following equations of: 1.5≦{(Cr+Mo+1.5Si+0.5Nb)/(Ni+0.5Mn+30C+30N)}≦2.3 and 25≦PREN (Cr+3.3Mo+16N)≦45. The welding wire of the invention forms the suitable weld metal in welding the dual phase structure stainless steel instead of the single phase steel so that remarkable effects can be expected in welding equipments of the sea water resistant austenitic-ferritic stainless steel which are used for various apparatuses for the chemical industry.