Electric heating – Metal heating – By arc
Patent
1992-12-01
1995-07-25
Yee, Deborah
Electric heating
Metal heating
By arc
138DIG6, 219 74, 219 591, 148909, C22C 3822, B23K 1100
Patent
active
054358582
ABSTRACT:
This invention is of a Cr--Mo steel pipe of a wall thickness of 13 mm or less, containing C: 0.03-0.10 wt %, Si: 0.50-1.00 wt %, Mn: 0.30-0.60 wt %, P.ltoreq.0.007 wt %, S.ltoreq.0.020 wt %, Cr: 1.00-1.50 wt %, Mo: 0.45-0.65 wt %, Al: 0.002-0.010 wt % and N: 0.002-0.010 wt % and the remainder consisting of Fe and unavoidable impurities for which preheating and postheating treatments for the prevention of weld cracking and stress corrosion cracking can be effectively omitted, said steel pipe of this invention being suitable for steam piping applications such as STPA23 used in power generation plants, etc.
REFERENCES:
patent: 4529454 (1985-06-01), Hataya et al.
patent: 5213633 (1993-05-01), Hada et al.
T. Matsumoto et al "Reduction of Carbon Content and Provemention of Weld Cracking in 11/4Cr-1/2Mo Steel; Quarterly Journal of the Japan Welding Society" vol. 3 (1985), No. 2, pp. 135-143; and its partial English language translation.
Japanese High Pressure Institute "(Nongovenmental) Standard HPIS E-111-1981" pp. 128-137; and its partial English language translation.
NKK Corp. "NKK Technical Material STPA23WEL" Dec. 1991; and its entire English language translation.
Akiyama Koji
Arima Takero
Nishino Yukio
Oyama Motoaki
Takamura Toshihiro
NKK Corporation
Yee Deborah
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