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Cold rolling-drawing method for producing small-sized square flat steel with low-carbon and high-sulfur free-cutting steel

A technology of free-cutting steel and square flat steel, applied in metal rolling, metal rolling, workpiece surface treatment equipment, etc., can solve the problem of inability to manufacture qualified small square flat steel billets, so as to avoid heat loss and improve the surface quality effect

Active Publication Date: 2013-09-18
WUXI TIANCHEN COLD DRAWING STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The development of cold rolling process has been very mature so far, but because people have not fully grasped the room temperature brittleness of low-carbon and high-sulfur free-cutting structural steel, people habitually believe that: use low-carbon and high-sulfur free-cutting structural steel to manufacture small square Flat steel must be realized by hot rolling billets, and cold rolling methods cannot produce qualified small square flat steel billets

Method used

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  • Cold rolling-drawing method for producing small-sized square flat steel with low-carbon and high-sulfur free-cutting steel
  • Cold rolling-drawing method for producing small-sized square flat steel with low-carbon and high-sulfur free-cutting steel

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Effect test

Embodiment 1

[0024] Utilize the cold-rolling-drawing method of producing small square flat steel with low-carbon high-sulfur free-cutting steel of the present invention, the step of making the small flat steel whose cross-sectional size is 5mm*20mm is as follows:

[0025] The first step is material selection. Select the 12L14 steel grade in the ASTM29 / A29M (2005) standard, and the hot-rolled round steel with a diameter of 16mm and a length of 1.72m.

[0026] The second step is to roll the head. Put one end of the φ16 hot-rolled round steel into the flat steel rolling head machine, and use the flat steel rolling head machine to roll it into a flat steel head with a section size of about 4.5mm*19.5mm. The length of the head is about It is 13cm.

[0027] The third step is pickling / shot blasting. For the hot-rolled round steel after rolling, the first pickling / shot blasting is carried out to remove the scale.

[0028] The fourth step is a cold rolling. At normal temperature, the hot-rolle...

Embodiment 2

[0037] Utilize the cold-rolling-drawing method of producing small-sized square flat steel with low-carbon high-sulfur free-cutting steel of the present invention, the step of making the small-sized flat steel that cross-sectional size is 20mm*30mm is as follows:

[0038] The first step is material selection. Select the 12L14 steel grade in the ASTM29 / A29M (2005) standard, and the hot-rolled round steel with a diameter of 36mm and a length of 1m.

[0039] The second step is to roll the head. Put one end of the φ36 hot-rolled round steel into the flat steel rolling head machine, and use the flat steel rolling head machine to roll it into a flat steel head with a section size of about 19.5mm*29.5mm. The length of the head is about It is 13cm.

[0040] The third step is pickling / shot blasting. For the hot-rolled round steel after rolling, the first pickling / shot blasting is carried out to remove the scale.

[0041] The fourth step is a cold rolling. At normal temperature, the...

Embodiment 3

[0050] Utilize the cold-rolling-drawing method of producing small-sized square flat steel with low-carbon high-sulfur free-cutting steel of the present invention, the step of making the small-sized flat steel (approximate square steel) that cross-sectional size is 11mm*12mm is as follows:

[0051] The first step is material selection. Select the 1215 steel type in the ASTM29 / A29M (2005) standard, and the hot-rolled round steel with a diameter of 18mm and a length of 1.43m.

[0052] The second step is to roll the head. Put one end of the φ18 hot-rolled round steel into the flat steel rolling head machine, and use the flat steel rolling head machine to roll it into a flat steel head with a section size of about 10mm*10mm, and the length of the head is about 13cm .

[0053] The third step is pickling / shot blasting. For the hot-rolled round steel after rolling, the first pickling / shot blasting is carried out to remove the scale.

[0054] The fourth step is a cold rolling. At ...

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Abstract

The invention relates to a manufacturing method of small-sized square flat steel, in particular to a method for rolling low-carbon and high-sulfur free-cutting steel into the small-sized square flat steel by a cold rolling-drawing manner. The method comprises the steps of material selection, head rolling, pickling / shot blasting, cold rolling, recrystallization annealing, pickling / shot blasting saponification, cold drawing and straightening. The method can reduce the blank rejection rate of rolling, improve the precision and surface quality of a finish product, and reduce loss of raw materials during the rolling.

Description

technical field [0001] The invention relates to a method for manufacturing a small square flat steel, in particular to a method for rolling low-carbon, high-sulfur free-cutting steel into a small square flat steel by means of cold rolling and drawing. Background technique [0002] Low-carbon high-sulfur free-cutting structural steel is a special type of steel, specifically referring to Y08, Y12, Y15, Y20, Y08Pb, Y12Pb, Y15Pb in the Chinese GB / T8731-2008 standard, and the American ASTM29 / A29M (2005) standard 1215, 12L14, and 11SMn30, 11SMnPb30 and other steel types in the German DIN EN 10087 standard. In the chemical composition of these steel types, the carbon content is low (generally ≤0.20%), and the sulfur content is high (0.10~ 0.30%), therefore, steels of this structure are easier to cut, and are mainly used in the manufacture of parts that require high surface finish, high precision, and do not require heat treatment after cutting, and have been widely used in electron...

Claims

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Application Information

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IPC IPC(8): B21B1/36B21B45/04
Inventor 许适曹保国
Owner WUXI TIANCHEN COLD DRAWING STEEL
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