Steel for mold, and mold

Patent metadata

Field	Value
Publication number	US-10173258-B2
Application number	US-201514689583-A
Country	US
Kind code	B2
Filing date	Apr 17, 2015
Priority date	Apr 30, 2014
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

The present invention relates to a steel for a mold, having a composition containing, on a % by mass basis, 0.25%<C<0.38%, 0.01%<Si<0.30%, 0.92%<Mn<1.80%, 0.8%<Cr<2.2%, 0.8%<Mo<1.4%, and 0.25%<V<0.58%, with the balance being Fe and inevitable impurities, and a mold manufactured by additive manufacturing by using the steel for a mold.

First claim

What is claimed is:

1. A steel for a mold, having a composition comprising, on a % by mass basis:
0.28%≤C<0.38%,
0.01%<Si<0.30%,
0.92%<Mn≤1.41%,
0.8%<Cr≤1.91%,
0.8%<Mo<1.4%, and
0.31%≤V<0.58%,
with the balance being Fe and inevitable impurities,
having a coefficient of thermal conductivity at 25° C., evaluated by a laser flash method, of 28 W/m/K or higher, and being used as a material for manufacturing a mold by additive manufacturing.

2. The steel for a mold according to claim 1 , further comprising, on a % by mass basis:
0.1%<Al<1.2%.

3. The steel for a mold according to claim 1 , further comprising, on a % by mass basis, at least either of the following:
0.30%<Ni≤3.5%, and
0.30%<Cu≤1.5%.

4. The steel for a mold according to claim 1 , further comprising, on a % by mass basis:
0.0001%<B≤0.0050%.

5. The steel for a mold according to claim 1 , further comprising, on a % by mass basis, at least one of the following:
0.003%<S≤0.250%,
0.0005%<Ca≤0.2000%,
0.03%<Se≤0.50%,
0.005%<Te≤0.100%,
0.01%<Bi≤0.50%, and
0.03%<Pb≤0.50%.

6. The steel for a mold according to claim 1 , further comprising, on a % by mass basis, at least one of the following:
0.004%<Nb≤0.100%,
0.004%<Ta≤0.100%,
0.004%<Ti≤0.100%, and
0.004%<Zr≤0.100%.

7. The steel for a mold according to claim 1 , further comprising, on a % by mass basis, at least either of the following:
0.10%<W≤4.00%, and
0.10%<Co≤3.00%.

8. The steel for a mold according to claim 1 , wherein the material is a powder or plates.

9. A mold manufactured by additive manufacturing by using the steel for a mold described in claim 1 .

Assignees

• Daido Steel Co Ltd

Inventors

• Kawano Masamichi

Classifications

• B22F10/28

  Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM] · CPC title

• C22C38/06

  containing aluminium · CPC title

• B29C45/26

  Moulds · CPC title

• C22C38/20

  with copper · CPC title

• B22C9/061 Primary

  Materials which make up the mould · CPC title