Low thermal expansion cast steel product and method for manufacturing same
AssigneeShinhokoku Material Corp.
InventorsHaruyasu OHNO, Kotaro ONA
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Abstract
The present invention addresses the problem of providing a low thermal expansion cast steel product having excellent plating properties. A low thermal expansion cast steel product according to the present invention has a chemical composition containing, in mass %, 0.040% or less of C, 0.30% or less of Si, 0.50% or less of Mn, 0.010% or less of S, 31.00-34.00% of Ni, 4.90-6.00% of Co, 0.0100% or less of O, and 0.010-0.100% of Al, the remaining portion being Fe and unavoidable impurities, has an austenite structure having an average grain size of 200 μm or less, and has an average thermal expansion coefficient of 0.4×10-6/° C. or less at 25-100° C.
Claims2
A low thermal expansion cast steel product,
- having a chemical composition comprising, by mass %,
- C:
- 0.040% or less,
- Si:
- 0.30% or less,
- Mn:
- 0.50% or less,
- S:
- 0.010% or less,
- Ni:
- 31.00 to 34.00%,
- Co:
- 4.90 to 6.00%,
- O:
- 0.0100% or less,
- Al:
- 0.010 to 0.100%, and
- balance of Fe and unavoidable impurities,
- having average grain size of an austenite structure of 200 μm or less,
- having a mean coefficient of thermal expansion in 25 to 100° C. of 0.4×10−6/° C. or less.
Dependencies are inferred from the claim text.