C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/60 (2006.01) C21D 6/00 (2006.01) C21D 7/13 (2006.01) C21D 8/00 (2006.01) C22C 38/00 (2006.01) C22C 38/42 (2006.01) C22C 38/44 (2006.01) C22C 38/46 (2006.01)
Patent
CA 2371333
The invention relates to a martensite-hardenable steel with improved machinability, good weldability and high corrosion resistance, a process for heat-treating a steel of this type and the use thereof. According to the invention, this steel contains (in percent by weight) 0.02 - 0.075% carbon 0.1 - 0.6% silicon 0.5 - 0.9% manganese 0.08 - 0.25% sulphur maximum 0.04% phosphorus 12.4 - 15.2% chromium 0.05 - 1.0% molybdenum 0.2 - 1.8% nickel maximum 0.15% vanadium 0.1 - 0.45% copper maximum 0.03% aluminum 0.02 - 0.08% nitrogen as well as, optionally, one or more further alloying components up to a maximum 2.0%, the rest iron and production-dependent impurities, and has a ferrite component in its structure of less than 28 percent by volume. A process for heat-treating a martensite-hardenable steel with improved machinability, said process providing an article that has been completely hardened even with a large cross section, essentially consists therein that a steel block having the above composition is subjected, in a first step, to an annealing treatment to form and set a ferrite component in the structure and that it is hot-formed in a second step, after which a soft annealing is performed in a third step and then a heat treatment.
Lichtenegger Gerhard
Sammer Johann
Sammt Klaus
Bohler Edelstahl Gmbh
Marks & Clerk
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