Title:
HOT WORK TOOL STEEL
Document Type and Number:
WIPO Patent Application WO/2022/190441
Kind Code:
A1
Abstract:
This hot work tool steel has a composition containing 0.38 to 0.45 mass% of C, 0.50 mass% or less of Si, 0.37 to 1.00 mass% of Mn, 4.30 to 5.50 mass% of Cr, 0.11 to 0.20 mass% of Ni, 1.5 to 3.2 mass% of Mo+(1/2)W, 0.49 to 0.62 mass% of V, and 0.006 to 0.025 mass% of N, with the remainder made up by Fe and unavoidable impurities. The hot work tool steel is such that the value of A calculated by A = 1050 - 373.6[C] + 28.7[Cr] - 150.0[Ni] - 127.3[V] + 45.9[Mo + (1/2)W], where [X] represents the component X content in mass%, exceeds 1000. It is thereby possible to obtain hot work tool steel having an excellent 0.2% proof stress at high temperatures. When a die is manufactured using this hot work tool steel, plastic deformation is prevented from occurring and highly accurate processing is made possible, even when processing is performed on a high-strength steel grade.
Inventors:
NEGISHI SHIGETOSHI
Application Number:
PCT/JP2021/036333
Publication Date:
September 15, 2022
Filing Date:
September 30, 2021
Export Citation:
Assignee:
NIPPON KOSHUHA STEEL CO LTD (JP)
International Classes:
C21D9/00; C22C38/00; C22C38/46
Foreign References:
| JP2017155306A | 2017-09-07 | |||
| JP2021031695A | 2021-03-01 |
Attorney, Agent or Firm:
FUJIMAKI Masanori (JP)
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