Tool steel composition
AssigneeAubert & Duval
InventorsAndré Grellier, Michel Siaut
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Abstract
The invention relates to a tool steel composition comprising, expressed in weight percentage: C 0.3%-0.4% Cr 2.0%-4.0% Mo 0.8%-3.0% V 0.4%-1.0% W 1.5%-3.0% Co 1.0%-5.0% Si 0 %-1.0% Mn 0 %-1.0% Ni 0 %-1.0% the balance being mainly constituted by iron and inevitable impurities, and also to a method of preparing the composition.
Claims13
A tool steel composition for making tools that withstand heat and that work under high levels of stress, said tool steel containing a set of alloying elements which is balanced so as to provide sufficient quenchability for obtaining uniform properties throughout the thickness of parts of large size comprising in weight percentage:
- a) carbon as a basic hardening element in the range of 0.33 to 0.37%,
- b) complementary hardening elements chromium and molybdenum in the ranges of:
- Cr 2.0%-4.0%
- Mo 1.2%-2.2%
- such that said tool steel does not include a preponderance of chromium carbides which are harmful for stability in operation,
- c) complementary hardening elements vanadium and tungsten are present in the ranges of:
- V 0.4%-1.0%
- W 1.5%-3.0%
- which provides for increasing structural resistance to heating and for raising the highest acceptable operating temperatures, and
- d) the following elements in the following ranges:
- Co 1.0%-5.0%
- Si 0%-1.0%
- Mn 0%-1.0%
- Ni 0%-1.0%
- the balance being mainly constituted by iron and inevitable impurities.
Dependencies are inferred from the claim text.