Title:
機械構造用鋼、機械構造部品およびその製造方法
Document Type and Number:
Japanese Patent JP7410391
Kind Code:
B2
Abstract:
To secure machinability improvement and hot ductility by In inclusion, by focusing to polishing of elementary material for machine structural parts after carburizing quenching tempering.SOLUTION: In order to secure hot ductility, the S+In total content may satisfy Formula 1. The inclusion of Si and In suppresses the reaction with a tool to improve the machinability. In order to reduce the tool wear, the In/Si may satisfy Formula 2. In addition, Formula 3 which is an index of the stability of austenite, and Formula 4 which is an index for additively evaluating by weighting the degree of influence of each element on the degree influencing the tempering softening resistance after carburizing and tempering may be within a certain range. [S]+[In]≤0.230 (Formula 1) [In]/[Si]≥0.15 (Formula 2), 11.3≤-0.1×[Si]+15.2×[Mn]+7.0×[Cr]≤24.0 (Formula 3), 31×[Si]+15×[Mn]+23×[Cr]≥50.0 (Formula 4)SELECTED DRAWING: None
Inventors:
Toshiharu Maso
Tatsuya Iwasaki
Tatsuya Iwasaki
Application Number:
JP2020051397A
Publication Date:
January 10, 2024
Filing Date:
March 23, 2020
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
C22C38/00; B23B1/00; C21D1/06; C21D6/00; C22C38/60
Domestic Patent References:
| JP2001131684A | ||||
| JP5125483A | ||||
| JP2017082310A |
Foreign References:
| WO2019142947A1 | ||||
| WO2019098340A1 |
Attorney, Agent or Firm:
Atsushi Aoki
Shinji Mihashi
Ritsuo Fukuchi
Manabu Saito
Shinji Mihashi
Ritsuo Fukuchi
Manabu Saito
Previous Patent: voltage detection circuit
Next Patent: Machine structural steel, machine structural parts and their manufacturing method
Next Patent: Machine structural steel, machine structural parts and their manufacturing method