Maraging steel

Patent metadata

Field	Value
Publication number	US-2017356070-A1
Application number	US-201715599497-A
Country	US
Kind code	A1
Filing date	May 19, 2017
Priority date	Jun 8, 2016
Publication date	Dec 14, 2017
Grant date	—

Abstract

Disclosed is a mar aging steel containing, in combination in mass percent, C in a content from greater than 0% to 0.02%, Mn in a content from greater than 0% to 0.3%, Si in a content from greater than 0% to 0.3%, Ni in a content of 10% to 13%, Mo in a content of 0.5% to 3.5%, Co in a content of 9% to 12%, Cr in a content of 1.5% to 4.5%, Ti in a content of 1.5% to 4.5%, and Al in a content of 0.01% to 0.2%, where the total content of Mo and Ti is 5.0 mass percent or less, and the ratio ([Mo]/[Ti]) of the Mo content [Mo] to the Ti content [Ti] is 1.0 or less, with the remainder consisting of iron and inevitable impurities.

First claim

1 . A maraging steel comprising, in mass percent:
C in a content from greater than 0% to 0.02%; Mn in a content from greater than 0% to 0.3%; Si in a content from greater than 0% to 0.3%; Ni in a content of 10% to 13%; Mo in a content of 0.5% to 3.5%; Co in a content of 9% to 12%; Cr in a content of 1.5% to 4.5%; Ti in a content of 1.5% to 4.5%; and Al in a content of 0.01% to 0.2%, a total content of Ti and Mo being 5.0% or less, a ratio ([Mo]/[Ti]) of the Mo content [Mo] to the Ti content [Ti] being 1.0 or less, with the remainder consisting of iron and inevitable impurities.

2 . The maraging steel according to claim 1 ,
wherein the maraging steel has: a phosphorus (P) content from greater than 0% to 0.01%; a nitrogen (N) content from greater than 0% to 0.01%; and a sulfur (S) content from greater than 0% to 0.01%, where P, N, and S are present in the inevitable impurities.

3 . The maraging steel according to claim 1 , wherein the maraging steel has a surface hardness in terms of Vickers hardness of 400 Hv or more.

4 . The maraging steel according to claim 2 , wherein the maraging steel has a surface hardness in terms of Vickers hardness of 400 Hv or more.

Assignees

• Kobe Steel Ltd

Inventors

• Miyamura Takeo
• Namba Shigenobu
• Chen Zhuyao

Classifications

• C21D1/18

  Hardening (C21D1/02 takes precedence); Quenching with or without subsequent tempering (quenching devices C21D1/62) · CPC title

• C22C38/50

  with titanium or zirconium · CPC title

• C22C38/02

  containing silicon · CPC title

• C22C38/004

  Very low carbon steels, i.e. having a carbon content of less than 0,01% · CPC title

• C22C38/52

  with cobalt · CPC title