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A flat coil control method for hot-rolled advanced high-strength steel

A control method and high-strength steel technology, applied in the direction of rolling mill control device, contour control, metal rolling, etc., can solve the problems of thin-gauge steel coil flat coil without significant improvement, not enough to support its own weight, and affect production efficiency, etc., to achieve Avoid the increase of production cost, avoid the loss of yield, and increase the effect of capacity

Active Publication Date: 2022-02-01
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the thickness of hot-rolled strip steel is also an important factor affecting flat coils. The thinner the strip steel is, the lower its stiffness is, which is not enough to support its own weight, and it is easy to cause flat coil defects
Some of the hot-rolled flat coil control methods involved in the above-mentioned patented technology have too high a coiling temperature, which is likely to cause surface problems such as internal oxidation for some steel types, and bring difficulties to subsequent coating; some control methods (such as too long coils) drum waiting time) affects production efficiency, or there is no significant improvement in the flat coil problem of thin gauge steel coils

Method used

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  • A flat coil control method for hot-rolled advanced high-strength steel
  • A flat coil control method for hot-rolled advanced high-strength steel
  • A flat coil control method for hot-rolled advanced high-strength steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] For hot-rolled QP steel, the strip thickness ranges from 1.0 mm to 4.0 mm. The chemical composition weight percentage (wt.%) of the strip steel is shown in Table 1, and the remainder is Fe and unavoidable impurities. The relevant processes of strip steel are shown in Table 2a, 2b.

[0047] Table 1: Strip Chemical Composition (wt.%)

[0048]

[0049] Table 2a

[0050]

[0051] Table 2b

[0052]

[0053] The following table 3 is the result of the flat coil degree of the strip steel coil in embodiment 1 and the comparison with the comparative example.

[0054] Table 3: Implementation Effect

[0055]

Embodiment 2

[0057] Cold-rolled DP steel hot-rolled raw coils, strip thickness from 1.0mm to 4.0mm, the chemical composition weight percentage (wt.%) of the strip is shown in Table 4, and the remainder is Fe and unavoidable impurities. See Table 5a, 5b for strip related processes.

[0058] Table 4: Strip chemical composition (wt.%)

[0059]

[0060] Table 5a

[0061]

[0062] Table 5b

[0063]

[0064] The following table 6 shows the result of the flat coil degree of the strip steel coil in Example 2 and the comparison with the comparative example.

[0065] Table 6: Implementation Effect

[0066]

Embodiment 3

[0068] For hot-rolled hot-formed steel, the strip thickness ranges from 1.0mm to 4.0mm. The chemical composition weight percentage (wt.%) of the strip steel is shown in Table 7, and the remainder is Fe and unavoidable impurities. See Table 8a, 8b for strip related processes.

[0069] Table 7: Strip steel chemical composition (wt.%)

[0070]

[0071] Table 8a

[0072]

[0073] Table 8b

[0074]

[0075] The following table 9 shows the result of the flat coil degree of the strip steel coil in embodiment 3 and the comparison with the comparative example.

[0076] Table 9: Implementation Effect

[0077]

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Abstract

The invention discloses a flat coil control method of hot-rolled advanced high-strength steel, which is characterized in that it mainly includes four control stages: the surface roughness control stage of the strip steel finish rolling, the laminar flow cooling austenite phase transformation control stage, and the coiling stage. Tension control stage, rotation control stage after winding. The invention increases the surface roughness of the finished hot-rolled strip steel, increases the interlayer friction force and equivalent shear stiffness of the steel coil, and then increases the ability to resist the flat coil of the steel coil; increases the resistance of the strip steel on the laminar flow roller table It reduces the phase transformation expansion, latent heat expansion and phase transformation plastic deformation after coiling, and coordinates the conversion of the gravitational potential energy and the total elastic storage energy of the steel coil, so that the diameter change of the inner ring after the coil is unloaded is controllable. range, to avoid the additional production cost increase and yield loss caused by cutting off the inner ring of the steel coil. The invention is suitable for hot-rolled advanced high-strength steel grades with different components, especially for thin-gauge hot-rolled steel strips, and has wide application value.

Description

technical field [0001] The invention relates to a strip steel manufacturing method, in particular to a flat coil control method of hot-rolled advanced high-strength steel, and belongs to the field of hot-rolled strip steel manufacturing in iron and steel metallurgy. Background technique [0002] With the improvement of social requirements for the environment, energy, safety, etc., automotive steel is developing in the direction of lightweight, high strength and low cost. The production of thin-gauge advanced high-strength steel (AHSS) by thin slab continuous casting and rolling has become an industry new direction of development. The typical production process of thin slab continuous casting and rolling generally includes molten steel smelting, slab continuous casting, soaking furnace heating, finishing rolling, strip laminar cooling, coiling and warehousing cooling. figure 1 shown. It is worth noting that some types of advanced high-strength steel (AHSS) are prone to fail...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/00B21B37/30B21B37/48B21B37/74C22C38/02C22C38/04C22C38/12C22C38/14C22C38/06C22C38/22C22C38/28C22C38/26C22C38/38C22C38/32C22C38/34C22C38/16C22C38/20C22C38/24
CPCB21B37/00B21B37/30B21B37/48B21B37/74C22C38/02C22C38/04C22C38/12C22C38/14C22C38/06C22C38/22C22C38/28C22C38/26C22C38/38C22C38/32C22C38/34C22C38/16C22C38/20C22C38/24
Inventor 刘洋王成宋波何金平孙宜强汪水泽
Owner 武汉钢铁有限公司