| 摘要 |
A steel alloy contains 0.3 to 1.0 % carbon, 0.2 to 2.5 % silicium, up to 0.8 % manganese, 30.0 to 48.0 % nickel, 16.0 to 22.0 % chromium, 0.5 to 18.0 % cobalt, 1.5 to 4 % molybdenum, 0.2 to 0.6 %niobium, 0.1 to 0.5 % titanium, 0.1 to 0.6 % zirconium, 0.1 to 1.5 % tantalum and 0.1 to 1.5 % hafnium, the remaining percentage being made up of over 20 % iron when the cobalt content equals or exceeds 10 % and of over 30 % iron when the cobalt content is lower than 10 %. The steel alloy is particularly useful as heat-resistant and heating resistant materials for parts, in particular pipes of petrochemical cracking furnaces for producing ethylene or synthesis gas.
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