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Low-temperature stress-relief heat treatment process for precision cold-rolled ultra-thin stainless steel strip

A stainless steel strip and stress relief technology, which is applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as easy deformation, and achieve the effects of low cost, guaranteed quality, and simple process

Active Publication Date: 2018-07-06
YONGXIN PRECISION MATERIAL WUXI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a low-temperature stress-relief heat treatment process for precision cold-rolled ultra-thin stainless steel strips to solve the problem in the prior art that the stamping parts of precision cold-rolled stainless steel strips are easily deformed by chemical corrosion

Method used

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  • Low-temperature stress-relief heat treatment process for precision cold-rolled ultra-thin stainless steel strip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] see figure 1 As shown, in this embodiment, a low-temperature stress-relieving heat treatment process for precision cold-rolled ultra-thin stainless steel strips, the specific processing steps are:

[0021] 1) Select the finished steel coil for finishing rolling: the grade of the selected steel coil is SUS304, the chemical composition: carbon (C) 0.05%, silicon (Si) 0.42%, manganese (Mn) 1.3%, phosphorus (P) 0.045%, sulfur ( S) 0.025%, Nickel (Ni) 8.02%, Chromium (Cr) 18.3%, Copper (Cu) 0.13%, Nitrogen (N) 0.028%, Molybdenum (Mo) 0.01%, after finishing rolling by Sendzimir twenty-high mill The finished precision cold-rolled stainless steel coil has a thickness of 0.15mm, a width of 308mm, a 2D surface, a roughness of Ra0.25-0.35um, and a flatness of 1.0-1.5mm. Its mechanical properties are tensile strength σb≥930Mpa, yield Strength σ0.2≥665Mpa, elongation σ5≥3%, hardness HV310~340;

[0022] 2) Stretch bending straightening treatment: For the finished coils with a thick...

Embodiment 2

[0027] see figure 1 As shown, in this embodiment, a low-temperature stress-relieving heat treatment process for precision cold-rolled ultra-thin stainless steel strips, the specific processing steps are:

[0028] 1) Select the finish-rolled finished steel coil: the selected grade is SUS304, and the chemical composition is the same as in Example 1. Finished precision cold-rolled stainless steel strips and coils that have been finished by the Sendzimir 20-high mill. Its thickness is 0.20mm, width 336mm, surface 2D surface, roughness Ra0.25~0.35um, straightness 0.8~1.0mm, its mechanical properties tensile strength σb≥930Mpa, yield strength σ0.2≥665Mpa, elongation σ5≥3%, hardness HV310~340.

[0029] 2) Stretch bending straightening treatment: For the finished coils with a thickness of 0.20mm, a width of 336mm, and a flatness of 1.0-1.5mm that have been finished rolled by a 20-high rolling mill, a 23-roll stretch-bending straightening machine is used to shape the finished coils. ...

Embodiment 3

[0034] see figure 1 As shown, in this embodiment, a low-temperature stress-relieving heat treatment process for precision cold-rolled ultra-thin stainless steel strips, the specific processing steps are:

[0035] 1) Select the finish-rolled finished steel coil: the selected grade is SUS304, and the chemical composition is the same as in Example 1. Finished precision cold-rolled stainless steel strips and coils that have been finished by the Sendzimir 20-high mill. Its thickness is 0.40mm, width 336mm, surface 2D surface, roughness Ra0.25~0.35um, straightness 1.0~1.5mm, its mechanical properties tensile strength σb≥930Mpa, yield strength σ0.2≥665Mpa, elongation σ5≥3%, hardness HV320~340.

[0036] 2) Stretch bending straightening treatment: For the finished coils with a thickness of 0.40 mm, a width of 336 mm, and a flatness of 1.0 to 1.5 mm that have been finished rolled by a 20-high rolling mill, a 23-roll stretch bending straightening machine is used to carry out the plate ...

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Abstract

The invention discloses a low-temperature distressing thermal treatment process for a precise cold-rolled extremely-thin stainless steel strip. The low-temperature distressing thermal treatment process comprises the following steps of 1) selecting a finish-rolled finished product steel coil, wherein flatness of the selected steel coil is 1.0-1.5mm; 2) carrying out stretch-bending straightening treatment: carrying out constant-stretching-mode stretch-bending straightening on the selected steel coil, and finally controlling the flatness of the steel coil to be 0.30-0.50mm; 3) carrying out low-temperature thermal treatment: carrying out low-temperature distressing thermal treatment on the steel strip subjected to the stretch-bending straightening treatment at a thermal treatment temperature being 400-780 DEG C, and adopting protective gas in a low-temperature thermal treatment process; and 4) carrying out low-tension coil separating. The low-temperature distressing thermal treatment process for the precise cold-rolled extremely-thin stainless steel strip disclosed by the invention adopts the process technical scheme of removing internal stress generated by steel strip rolling and follow-up stretch-bending straightening through low-temperature thermal treatment, so that when the precise cold-rolled extremely-thin stainless steel strip which is used for parts of tablet personal computers, keyboard back boards, middle boards / backboards of mobile phones and the like is subjected to stamping forming and chemical corrosion, deformation is not liable to cause.

Description

technical field [0001] The invention belongs to the stainless steel strip stress-relief treatment technology, in particular to a low-temperature stress-relief heat treatment process for precision cold-rolled ultra-thin stainless steel strips. Background technique [0002] At present, most precision stainless steel strips are rolled by multi-roll mills such as 14-roll and 20-roll mills, heat treated in a continuous bright annealing furnace, and steel strips are produced by stretch-bending straightening machines to improve the flatness of steel strips, which cannot meet the requirements of ultra-high Flatness and stamping parts need to be chemically etched to change the appearance of the parts, which are easy to deform and have a high scrap rate. Contents of the invention [0003] The purpose of the present invention is to provide a low-temperature stress-relief heat treatment process for precision cold-rolled ultra-thin stainless steel strips to solve the problem in the pri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/52C21D1/30B21C37/02
CPCB21C37/02C21D1/30C21D9/52
Inventor 袁选利
Owner YONGXIN PRECISION MATERIAL WUXI
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