Welding material for low chromium (Cr) ferritic steel having hig

Details Welding material for low chromium (Cr) ferritic steel having hig Welding material for low chromium (Cr) ferritic steel having hig

1998-04-09

1999-08-31

Yee, Deborah

Alloys or metallic compositions

Ferrous

Nine percent or more chromium containing

420106, 420109, C22C 3844, C22C 3848

Patent

active

059450649

ABSTRACT:
This invention provides a welding material for low chromium (Cr) ferritic heat-resisting steel having high toughness, wherein the chemical composition of welding metal comprises, in weight %, carbon (c) 0.04-0.1%, silicon (Si) 0.1-0.6%, manganese (Mn) 0.1-0.6%, phosphorus (P) 0.0005-0.03%, sulfur (S) 0.0005-0.015%, chromium (Cr) 1.75-2.5%, nickel (Ni) 0.01-0.8%, molybdenum (Mo) 0.05-1.5%, vanadium (V)0.01-0.5%, tungsten (W) 0.05-2%, niobium (Nb) 0.01-0.2%, tantalum (Ta) 0.01-0.5%, aluminum (Al) 0.003-0.05%, boron (B) 0.0001-0.01%, nitrogen (N) 0.003-0.03%, and the remainder comprises iron and inevitable impurities. The welding material satisfies the following formula: C+Cr/20+Mo/15+V/10+W/7+5B.ltoreq.0.8%. According to this invention, the welding material is suitable for welding low Cr ferritic heat-resisting steels having high strength such as those used in steam generators and heat exchangers of boilers, etc. which are exposed to high temperatures and high pressures, more particularly, at a high temperature of 500.degree. C. or more.

REFERENCES:
patent: 5211909 (1993-05-01), Iseda et al.
patent: 5407635 (1995-04-01), Iseda et al.
Toughness and Creep Strength of Modified 2.25Cr-1Mo Steel Weld Metal, K. Ichikawa et al., Welding Journal, Jul. (1995), No. 7, pp. 230-238.

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