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Large-specification free-cutting steel rolling method

A free-cutting steel, large-scale technology, applied in the field of steel rolling, to achieve the effects of excellent surface, smooth rolling process and good cutting performance

Active Publication Date: 2016-01-13
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the surface defects and internal quality problems of large-size free-cutting steel after rolling in the prior art, the present invention provides a large-size free-cutting steel rolling method, which makes the surface of the wire rod excellent without ears, folds, knots, etc. Scars and other defects, no internal defects such as shrinkage cavity in the center of the cross-section of the wire rod

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The rolling method of large-scale free-cutting steel with a diameter of 16mm, the parameters of the rolling process and control technology are as follows:

[0025] (1) The temperature of the preheating section of the heating furnace is 950°C, the temperature of the heating section is 1060°C, the temperature of the soaking section is 1200°C, and the rolling start temperature is 1110°C;

[0026] (2) The water pressure of high pressure water descaling is 15MPa;

[0027] (3) The cutting lengths of 2# and 3# flying shears are 250mm and 600mm respectively;

[0028] (4) The inlet temperature of the finishing mill is 980°C;

[0029] (5) The coil collection temperature is 870°C;

[0030] (6) The final rolling speed is 12m / s;

[0031] (7) The six fans on the cooling line are all turned on, the air volume is 100%, and the cooling rate is 1.5k / s.

[0032] The 16mm wire rod produced according to the above process has a good surface, no defects such as ears, folds, and scars, and...

Embodiment 2

[0034] The rolling method of large-scale free-cutting steel with a diameter of 20mm, the parameters of the rolling process and control technology are as follows:

[0035] (1) The temperature of the preheating section of the heating furnace is 980°C, the temperature of the heating section is 1050°C, the temperature of the soaking section is 1180°C, and the rolling start temperature is 1090°C;

[0036] (2) The water pressure of high pressure water descaling is 12MPa;

[0037] (3) The cutting lengths of 2# and 3# flying shears are 300mm and 630mm respectively;

[0038] (4) The inlet temperature of the finishing mill is 950°C;

[0039] (5) Roll collection temperature is 850°C;

[0040] (6) The final rolling speed is 11.5m / s;

[0041] (7) All six fans on the stack cooling line are turned on, the air volume is 100%, and the cooling rate is 1.0k / s.

[0042] According to the above process, the surface of the 20mm wire rod is excellent, without defects such as ears, folds, scars, e...

Embodiment 3

[0044] The rolling method of large-scale free-cutting steel with a diameter of 22mm, the parameters of the rolling process and control technology are as follows:

[0045] (1) The temperature in the preheating section of the heating furnace is 1000°C, the temperature in the heating section is 1045°C, the temperature in the soaking section is 1190°C, and the rolling start temperature is 1100°C;

[0046] (2) The water pressure of high pressure water descaling is 10MPa;

[0047] (3) The cutting lengths of 2# and 3# flying shears are 285mm and 680mm respectively;

[0048] (4) The inlet temperature of the finishing mill is 1000°C;

[0049] (5) Roll collection temperature is 900°C;

[0050] (6) The final rolling speed is 9m / s;

[0051] (7) The six fans on the cooling line are all turned on, the air volume is 100%, and the cooling rate is 0.8k / s.

[0052] The 22mm wire rod produced according to the above process has a good surface, no defects such as ears, folds, and scars, and no...

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Abstract

The invention discloses a large-specification free-cutting steel rolling method. The diameter of a steel wire rod of large-specification free-cutting steel is larger than or equal to 16 mm; the preheating segment temperature of a heating furnace ranges from 930 DEG C to 1000 DEG C; the temperature of a heating section ranges from 1010 DEG C to 1070 DEG C; the temperature of a soaking section ranges from 1110 DEG C to 1200 DEG C; the rolling temperature ranges from 1070 DEG C to 1130 DEG C; the high pressure water descaling water pressure is larger than or equal to 10 MPa; the shearing length of a second flying shear ranges from 250 mm to 350 mm, and the shearing length of a third flying shear ranges from 600 mm to 700 mm; the inlet temperature of a finishing mill ranges from 930 DEG C to 1000 DEG C; the reel collecting temperature ranges from 830 DEG C to 900 DEG C; and six draught fans on a stack cooling line are all started, the air amount is 100%, and the reel cooling speed ranges from 0.4 K / s to 3 K / s. The surface of the steel wire rod prepared with the method is excellent, defects of lug shapes, folding, scabbing and the like are avoided, and internal defects like shrinkage cavities in the centers of the cross sections of the steel wire rod are avoided.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular relates to a rolling method of large-size free-cutting steel. Background technique [0002] Due to the advantages of excellent cutting performance, high surface finish and high dimensional accuracy, free-cutting steel is widely used in the automobile industry, instrumentation, standard parts and other machinery manufacturing industries. Free-cutting steel wire rods need to have high machinability and surface quality. At the same time, due to the consideration of downstream processing costs, it is required to reduce the thickness of the wire rod scale to facilitate pickling. Therefore, in order to obtain a free-cutting steel wire rod with excellent comprehensive performance, it is necessary to optimize from two aspects. First, the quality of the billet should be improved, including reducing the surface defects of the billet and increasing the size of the as-cast MnS; The a...

Claims

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Application Information

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IPC IPC(8): B21B1/16B21B37/74
CPCB21B1/16B21B37/74
Inventor 贺莹莹曹理强麻晗
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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