Electric heating – Metal heating – Weld rod composition
Reexamination Certificate
2006-01-24
2010-06-08
Elve, M. Alexandra (Department: 3742)
Electric heating
Metal heating
Weld rod composition
C219S146230, C219S13700R
Reexamination Certificate
active
07732733
ABSTRACT:
The present invention provides a ferritic stainless steel welding wire which allows prevention of wire breaking, fine refining of crystal grains, and increased cracking resistance.A wire rod used essentially consists of, in mass %, 0.03% or less of C, 3% or less of B, 3% or less of Mn, 2% or less of Ni, 11 to 20% of Zr, 3% or less of Mo, 1% or less of Co, 2% or less of Cu, 0.02 to 2.0% of Al, 0.2 to 1.0% of Ti, 0.02% or less of O, 0.04% or less of N, at least one of Nb and Ta, the mass % thereof being eight times the total mass % of the C and N to 1.0 mass %, and the balance of Fe and unavoidable impurities. When the number of crystals per square mm (mm2) of a cross section of the wire rod is defined as m, a grain number of the crystal expressed by an exponent (G) in an expression of m=8×2Gis set to 3 to 10 by the heat treatment.
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Agata Yukio
Ito Tadashi
Kobayashi Masa-aki
Nonaka Satoru
Saito Teiichiro
Elve M. Alexandra
Nippon Welding Rod Co., Ltd.
Pearne & Gordon LLP
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