Steel for plastic molds and process for their heat treatment

Details Steel for plastic molds and process for their heat treatment Steel for plastic molds and process for their heat treatment

2005-05-17

2005-05-17

Jenkins, Daniel (Department: 1742)

Alloys or metallic compositions

Ferrous

Nine percent or more chromium containing

C420S088000, C148S607000, C148S608000

Reexamination Certificate

active

06893608

ABSTRACT:
Maraging steel with improved machinability, good weldability, and high corrosion resistance, a process for the heat treatment of such a steel, as well as its use. According to the invention this steel contains (in % by weight) 0.02-0.075% carbon; 0.1-0.6% silicon; 0.5-0.9% manganese; 0.08-0.25% sulfur; 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 additional alloying elements up to maximum 2.0%, residual iron, and impurities caused in manufacturing, and a ferrite percentage in the structure of less than 28% by volume. A process is also provided for the heat treatment of a maraging steel with improved machinability, which process makes an object that is through-hardened even with a large cross-section, lies essentially in that a steel block with the above composition is subjected in a first step to an annealing treatment for the formation and adjustment of a ferrite percentage in the structure and in a second step a hot forming of the same takes place, after which in a third step a soft annealing and then a thermal tempering are performed.

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English Language Abstract of EP 0 170 598.
Patent Abstracts of Japan, vol. 2000, No. 09, Oct. 13, 2000.

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