Alloy steel composition and produciing method thereof

Patent metadata

Field	Value
Publication number	US-2017342521-A1
Application number	US-201715603455-A
Country	US
Kind code	A1
Filing date	May 24, 2017
Priority date	May 24, 2016
Publication date	Nov 30, 2017
Grant date	—

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; 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 for a second time period; and performing a second cooling treatment on the workpiece to make workpiece become to be a Bainite structure, wherein a cooling rate of the second cooling treatment is high than the cooling rate of the first cooling treatment.

2 . The producing method according to claim 1 , 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.

3 . The producing method according to claim 1 , 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.

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.

5 . The producing method according to claim 1 , wherein a temperature of 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 first time period is between 5 minutes to 60 minutes.

6 . The producing method according to claim 1 , wherein the second cooling treatment is that the workpiece is putted in a salt bath of 250° C. to 450° C. for a third time period of 5 minutes to 60 minutes.

7 . The producing method according to claim 6 , 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.

8 . The producing method according to claim 1 , wherein the alloy steel composition includes 95 wt % to 98 wt % iron and one or a combination of 0.1 wt % to 2.0 wt % chrome, 0.1 wt % to 2.0 wt % manganese, and 0.1 wt % to 2.0 wt % nickel.

9 . The producing method according to claim 8 , wherein the alloy steel composition includes carbon with less than 1 wt %.

10 . An alloy steel composition, comprising:
95 wt % to 98 wt % iron; and one or a combination of 0.1 wt % to 2.0 wt % chrome, 0.1 wt % to 2.0 wt % manganese, and 0.1 wt % to 2.0 wt % nickel.

11 . The alloy steel composition according to claim 10 , further comprising carbon with less than 1 wt %.

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

• C25D3/12

  of nickel or cobalt · CPC title

• C21D2211/002

  Bainite · CPC title

• C22C38/04

  containing manganese · CPC title