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Treatment method of 630 steel

A treatment method and solution treatment technology, applied in the treatment field of 630 steel, can solve problems such as difficulty in meeting performance requirements, and achieve the effect of improving low temperature impact resistance.

Active Publication Date: 2015-02-18
SUZHOU DOUBLE GOLD IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the basis of this precipitation hardening, if the customer requires the steel to meet the requirements of impact energy ≥ 45 joules at -40°C under the premise of meeting the general standards, it is difficult to meet this performance requirement through ordinary heat treatment processes at present.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Hot-rolled and forged 630 steel bars;

[0020] (2) The 630 steel bar after the step (1) is completed is subjected to solution treatment at 1000°C, and then the bar is air-cooled to room temperature;

[0021] (3) After step (2) is completed, the 630 steel bar is subjected to overaging treatment at 680°C. The treatment time is determined according to the diameter of the bar in millimeters or the number of minutes of treatment, and then the bar is air-cooled to room temperature ;

[0022] (4) Insulate and heat the 630 steel bar after step (3) at 1000°C. The treatment time is determined according to the diameter of the bar in millimeters or the number of minutes of treatment, and then air cool the bar to room temperature;

[0023] (5) The 630 steel bar after step (4) is subjected to aging treatment at 580°C. The treatment time is determined according to the diameter of the bar in millimeters or the number of minutes of treatment, and then the bar is air-cooled to room ...

Embodiment 2

[0028] (1) Hot-rolled and forged 630 steel bars;

[0029] (2) The 630 steel bar after the step (1) is completed is subjected to solution treatment at 1060°C, and then the bar is air-cooled to room temperature;

[0030] (3) After the step (2) is completed, the 630 steel bar is subjected to overaging treatment at 710 ° C. The treatment time is determined according to the diameter of the bar in millimeters and the number of minutes of treatment, and then the bar is air-cooled to room temperature ;

[0031] (4) Insulate and heat the 630 steel bar after step (3) at 1040°C. The treatment time is determined according to the diameter of the bar in millimeters or the number of minutes of treatment, and then air cool the bar to room temperature;

[0032] (5) The 630 steel bar after step (4) is subjected to aging treatment at 610°C. The treatment time is determined according to the diameter of the bar in millimeters or the number of minutes of treatment, and then the bar is air-cooled t...

Embodiment 3

[0039] (1) Hot-rolled and forged 630 steel bars;

[0040] (2) The 630 steel bar after the step (1) is completed is subjected to solution treatment at 1100°C, and then the bar is air-cooled to room temperature;

[0041] (3) After the step (2) is completed, the 630 steel bar is subjected to overaging treatment at 740 ° C. The treatment time is determined according to the diameter of the bar in millimeters or the number of minutes of treatment, and then the bar is air-cooled to room temperature ;

[0042] (4) Insulate and heat the 630 steel bar after step (3) at 1080°C. The treatment time is determined according to the diameter of the bar in millimeters or the number of minutes of treatment, and then air cool the bar to room temperature;

[0043] (5) The 630 steel bar after step (4) is subjected to aging treatment at 640°C. The treatment time is determined according to the diameter of the bar in millimeters or the number of minutes of treatment, and then the bar is air-cooled to...

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Abstract

The invention discloses a treatment method of 630 steel, which comprises the following steps: carrying out hot rolling, and forging to form a 630 steel bar; carrying out solution treatment on the 630 steel bar at 1000-1100 DEG C, and cooling the bar to room temperature in air; carrying out overaging treatment on the 630 steel bar at 680-740 DEG C, wherein the number of minutes for treatment is determined according to the number of millimeters of the bar diameter; cooling the bar to room temperature in air; carrying out thermal-insulation heating treatment on the 630 steel bar at 1000-1080 DEG C, and cooling the bar to room temperature in air; and carrying out aging treatment on the 630 steel bar at 580-640 DEG C, and cooling the bar to room temperature in air. When the method is used for treating the 630 steel, the ballistic work of the 630 steel at -40 DEG C can be greater than or equal to 45J, thereby enhancing the low-temperature impact resistance of the 630 steel.

Description

technical field [0001] The invention relates to a method for heat-treating 630 steel to improve its impact energy value and strength. Background technique [0002] The proportion limit and yield strength of austenitic stainless steel are low, only 200Mpa, so it is not suitable as some structural materials. Martensitic stainless steel can obtain high strength through quenching and tempering, and can be used as structural materials, but its impact toughness lower. When the material is required to have both corrosion resistance and impact toughness at low temperatures, it is necessary to use Cr-Ni austenitic stainless steel. At this time, Cr-Ni precipitation hardening stainless steel that can be strengthened by heat treatment has emerged as the times require. , as a representative steel grade of precipitation hardening stainless steel 17-4PH, it can meet the requirements of strength, hardness and low temperature impact toughness after proper heat treatment. [0003] Precipit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/06C21D1/00
Inventor 邵晓峰
Owner SUZHOU DOUBLE GOLD IND
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