Alloy steel composition and producing method thereof

Patent metadata

Field	Value
Publication number	US-10920296-B2
Application number	US-201715603455-A
Country	US
Kind code	B2
Filing date	May 24, 2017
Priority date	May 24, 2016
Publication date	Feb 16, 2021
Grant date	Feb 16, 2021

Abstract

A method for producing an alloy steel composition includes the following steps: performing a first heat treatment on an alloy steel composition and maintaining for a first time period to soften the alloy steel composition; performing a first cooling treatment on the softened alloy steel composition; performing a treatment on the softened the alloy steel composition to form a workpiece; performing a second heat treatment on the workpiece and maintaining for a second time period; and performing a second cooling treatment on the workpiece to make the workpiece become to be a Bainite structure, and a cooling rate of the second cooling treatment is high than the cooling rate of the first cooling treatment.

First claim

What is claimed is:

1. A producing method of an alloy steel composition, comprising:
performing a first heat treatment on the alloy steel composition for a first time period to soften the alloy steel composition, wherein a temperature of the first heat treatment, is gradually increased to a temperature between 780° C. to 980° C. at a heating rate of 10° C. per minute to 100° C. per minute, and the first time period is between 5 minutes to 60 minutes;
performing a first cooling treatment on the softened alloy steel composition, wherein a temperature of the first cooling treatment, is naturally cooled to a room temperature at a cooling rate of 0.1° C. per minute to 10° C. per minute;
performing a treatment on the softened alloy steel composition to form a workpiece;
performing a second heat treatment on the workpiece for a second time period, wherein the second heat treatment is gradually increased to a temperature between 780° C. to 980° C. at a heating rate of 10° C. per minute to 100° C. per minute, and the second time period is between 5 minutes to 60 minutes; and
performing a second cooling treatment on the workpiece to make the workpiece become a bainite structure, wherein the second cooling treatment is that the workpiece is put in a salt bath of 250° C. to 450° C. for a third time period of 5 minutes to 60 minutes,
wherein a cooling rate of the second cooling treatment is higher than the cooling rate of the first cooling treatment, and the alloy steel composition includes 95 wt % to 98 wt % iron and one or a combination of 0.1 wt % to 2.0 wt % chromium and 0.1 wt % to 2.0 wt % nickel.

2. The producing method according to claim 1 , wherein the alloy steel composition includes carbon with less than 1 wt %.

3. The producing method according to claim 1 , wherein after the second cooling treatment, the method further includes:
cooling the workpiece naturally to a room temperature;
cleaning the workpiece; and
performing a plating treatment on a surface of the workpiece.

4. The producing method according to claim 1 , wherein the softened alloy steel composition is solid, and the toughness of the softened alloy steel composition is less than the toughness of the alloy steel that is unsoftened.

Assignees

• Asustek Comp Inc

Inventors

• Chiu Shih-Wei

Classifications

• C21D8/00

  Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment (hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation C21D1/02) · CPC title

• C22C38/58

  with more than 1.5% by weight of manganese · CPC title

• C23C8/02

  Pretreatment of the material to be coated (C23C8/04 takes precedence) · CPC title

• C23C18/1844

  with use of organic or inorganic compounds other than metals, first · CPC title

• C22C38/40

  with nickel · CPC title