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A kind of hot-rolled narrow strip steel for stamping parts and its preparation method and application

A technology for stamping parts and narrow strip steel is applied in the field of hot-rolled narrow strip steel for stamping parts and its preparation, which can solve the problems of rising production costs and small cold rolling units.

Active Publication Date: 2020-10-23
QIANAN CITY JIUJIANG WIRE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The market price of hot-rolled wide-band steel is higher than that of narrow-strip steel, and some cold-rolling companies need to cut and roll wide-band steel because of their small cold-rolling units, which further increases production costs

Method used

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  • A kind of hot-rolled narrow strip steel for stamping parts and its preparation method and application
  • A kind of hot-rolled narrow strip steel for stamping parts and its preparation method and application
  • A kind of hot-rolled narrow strip steel for stamping parts and its preparation method and application

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preparation example Construction

[0028] The invention provides a method for preparing hot-rolled narrow strip steel for stamping parts, comprising the following steps: sequentially heating the cast slab, first dephosphorization, rough rolling, second dephosphorization, finish rolling and coiling to obtain stamping parts Use hot-rolled narrow strip steel;

[0029] The slab includes the following chemical components in mass percentage: C: 0.04-0.08%, Si: 0.08-0.15%, Mn: 0.30-0.40%, P: ≤0.030%, S: ≤0.030%, Cr: ≤ 0.10%, Ni: ≤0.10%, Cu: ≤0.10%, As: ≤0.0080% and the balance iron;

[0030] The heating temperature is 1280-1300°C, and the heating time is 130-140min;

[0031] The inlet temperature of the rough rolling is 1250-1270°C;

[0032] An intermediate billet is obtained after the rough rolling, and the thickness of the intermediate billet is 26-28 mm;

[0033] The coiling temperature is 580-610°C;

[0034] The finish rolling is 9-pass rolling, and the roll diameters of the work rolls decrease successively fr...

Embodiment 1

[0049] Metal raw materials are smelted into a rectangular billet with a section of 165×280 mm. The mass percentage of the chemical composition of the rectangular billet is: C: 0.04%, Si: 0.10%, Mn: 0.32%, P: 0.015%, S: 0.017%, Cr : 0.02%, Ni: 0.01%, Cu: 0.01%, and the rest is iron.

[0050] The heating temperature in the soaking section is 1282°C, the heating time is 135min, the descaling pressure of the first pass is 17.56MPa, the entrance temperature of rough rolling is 1252°C, the exit thickness of the first pass of rough rolling is 126.5mm, the exit thickness of the second pass is 93.6mm, The exit thickness of the third pass is 62.7mm, the exit thickness of the fourth pass is 41.2mm, the exit thickness of the fifth pass is 26.3mm, and the rough rolling finish rolling temperature is 1208°C. The descaling pressure of the second pass is 18.35MPa, the finish rolling inlet temperature is 1168°C, the work roll diameter of the first pass of finish rolling is 512.5mm, the work rol...

Embodiment 2

[0053] Metal raw materials are smelted into a rectangular billet with a section of 150×330mm. The mass percentage of the chemical composition of the rectangular billet is: C: 0.08%, Si: 0.15%, Mn: 0.30%, P: 0.018%, S: 0.020%, Cr : 0.01%, Ni: 0.03%, Cu: 0.03%, and the rest is iron.

[0054] The heating temperature in the soaking section is 1295°C, the heating time is 140min, the descaling pressure of the first pass is 19.53MPa, the rough rolling inlet temperature is 1268°C, the exit thickness of the first rough rolling pass is 120.2mm, the exit thickness of the second pass is 90.1mm, The exit thickness of the third pass is 61.0mm, the exit thickness of the fourth pass is 40.6mm, the exit thickness of the fifth pass is 26.1mm, and the rough rolling finish rolling temperature is 1217°C. The descaling pressure of the second pass is 18.76MPa, the finish rolling inlet temperature is 1185°C, the work roll diameter of the first pass of finish rolling is 500.6mm, the work roll diameter...

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Abstract

The invention provides a hot rolled narrow strip used for a stamping part, a preparation method and an application and belongs to the technical field of metallurgy. The prep ration method comprises the following steps: successively conducting heating, a first dephosphorization, roughing, a second dephosphorization, finish rolling and winding a casting blank so as to obtain a hot rolled narrow strip used for a stamping part. For the hot rolled narrow strip provided by the invention, the AB difference is less than or equal to 0.01mm; the difference of three points is less than or equal to 0.03mm; the difference of a cleaning rod is less than or equal to 0.04mm; the thickness of a sinter is less than or equal to 7 microns; the yield strength is 258-285MPa; the tensile strength is 364-385MPa;the percentage elongation after fracture is 44.0-46.0%, so the hot rolled narrow strip can meet the production demand of the stamping part; compared with a conventional production process, the cost isnot increased; meanwhile, with small implementation difficulty, the invention has high generalizability.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a hot-rolled narrow strip steel for stamping parts and a preparation method and application thereof. Background technique [0002] Stamping parts are widely used in various fields of our lives, including some electronic devices, auto parts, decorative materials and so on. In order to meet the requirements of the continuous stamping production line and the aesthetics of the appearance, the stamping parts have higher requirements on the dimensional accuracy, surface quality and plasticity of the material, which are much better than the national standard. [0003] Due to the rough production of narrow strip steel, the hot-rolled products produced have poor dimensional accuracy, thick surface oxide scale, and unstable physical properties, which cannot meet the quality requirements of downstream customers. Therefore, at present, most domestic stamping parts processing enterprises ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/22B21B45/08B21B37/74C22C38/02C22C38/04C22C38/06C22C38/42
CPCB21B1/22B21B37/74B21B45/08B21B2001/225C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42
Inventor 梁鹏马啸晨冯润壮
Owner QIANAN CITY JIUJIANG WIRE
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