Title:
STEEL ROD FOR HOT FORGING
Document Type and Number:
WIPO Patent Application WO/2018/155610
Kind Code:
A1
Abstract:
Provided is a steel rod for hot forging. The steel rod has excellent hot workability and demonstrates high yield strength, high fatigue strength, excellent machinability, and excellent cracking characteristics after hot forging. This steel rod for hot forging has a chemical composition that: contains 0.05–0.40 mass% of C, 0.05–0.50 mass% of Si, 1.51–3.50 mass% of Mn, 0.010–0.100 mass% of P, no more than 0.30 mass% of S, 0.05–2.50 mass% of Cr, 0.10–0.75 mass% of V, 0.005–0.250 mass% of Ti, 0.005–0.060 mass% of Al, and 0.002–0.020 mass% of N, the remainder being Fe and unavoidable impurities; and satisfies formula (1). The number density of TiN particles that have an equivalent circle diameter of at least 20 μm is 0.3–4.0/mm2. (1) 0.48≤C+0.11Mn+0.08Cr+0.75V+0.20Mo≤1.50. The amounts (in terms of mass%) of the corresponding elements are to be substituted for the chemical symbols in the formula.
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Inventors:
MIYAKOSHI YUSUKE (JP)
TAKASUGA MOTOKI (JP)
TAKASUGA MOTOKI (JP)
Application Number:
PCT/JP2018/006622
Publication Date:
August 30, 2018
Filing Date:
February 23, 2018
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C22C38/00; C22C38/60; C21D8/06
Domestic Patent References:
| WO2012001146A1 | 2012-01-05 | |||
| WO2016059664A1 | 2016-04-21 |
Foreign References:
| JP2008208397A | 2008-09-11 | |||
| JP2004277817A | 2004-10-07 | |||
| JPH06122943A | 1994-05-06 | |||
| JPH11140582A | 1999-05-25 |
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (JP)
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