Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Kenichi Asai

Shinji Kodama

Manabu Mizumoto

Hideki Hamatani

Yoshinari Ishida

Nobuo Mizuhashi

A stainless steel flux-cored welding wire for zinc-coated steel sheet welding use which gives a weld zone where no zinc embrittlement cracking occurs and the corrosion resistance and ductility are excellent and which is good in weld work efficiency and a welding method using the same, the welding wire characterized in that total amounts of elements which are included as metals or alloy compositions in the sheath and flux are, by mass % with respect to a total mass of the welding wire, C: 0.01 to 0.05%, Si: 0.1 to 1.5%, Mn: 0.5 to 3.0%, Ni: 7.0 to 10.0%, and Cr: 26.0 to 30.0%, an F value is 30 to 50 in range, further, the wire contains, as slag forming agents, in the flux, by mass % with respect to the total mass of the wire, TiO: 3.8 to 6.8%, SiO: 1.8 to 3.2%, ZrO: 1.3% or less, and AlO: 0.5% or less, a total amount of the slag forming agent and other slag forming agents is 7.5 to 10.5%, furthermore, the TiOsatisfies, by mass % with respect to the total amount of slag forming agents, TiO: 50 to 65%, and a balance of the sheath and flux is Fe and unavoidable impurities.

Stainless steel flux-cored welding wire for welding of zinc-coated steel sheet and arc welding method of zinc-coated steel sheet using same

A stainless steel wire having a flux core for welding zinc-based alloy coated steel sheet having an outer metal sheath coating a core of flux wherein in total having in mass (%) as percentage to the total mass of the wire: C: 0.01-0.05%, Si: 0.1-1.5%, Mn: 0.5-3.0%, Ni: 7.0-10.0%, Cr: 26.0-30.0%, wherein an F value defined as a function of the above components ranges from 30 to 50, the flux further having a slag formation agent in mass (%) as percentage to the total mass of the wire: TiO: 0.6-2.6%, SiO: 1.8-3.8%, ZrO: 1.0-3.5%, and optionally AlO: 0.1-1.0%, wherein the slag formation agent in total is less than 10%, and the wire further containing Fe and residual impurities.

Stainless steel wire with flux core for welding zinc coated steel sheets

Disclosed are a weld joint and a stainless steel-based weld metal composition for the weld joint. The composition and weld joint made therefrom are suitable for welding a zinc-based alloy coated steel sheet. The weld is excellent in corrosion resistance and liquid-metal embrittlement crack resistance. This is accomplished by inhibiting liquid-metal embrittlement cracks of the stainless-steel-based weld metal when the zinc-based alloy coating steel sheet is welded using the stainless-steel-based weld metal. The weld joint comprises a welded portion of weld metal made of stainless-steel-based components, the weld metal containing in mass percent (%): C: 0.01-0.1; Si: 0.1-1; Mn: 0.5-2.5; Ni: 5-11; and Cr: 17-25, and the balance being iron and residual impurities, wherein the following expression are met: &#x2212;0.81&#xd7;Cr equivalent+23.2&#x2266;Ni equivalent&#x2266;0.95&#xd7;Cr equivalent&#x2212;8.1 . . . (1); Ni equivalent=Ni+30&#xd7;C+0.5&#xd7;Mn+30&#xd7;N . . . (2); Cr equivalent=Cr+Mo+1.5&#xd7;Si . . . (3).

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Tokyo, Japan

Kenichi Asai