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Manufacturing method of high strength bluing strapping steel

A production method and high-strength technology, applied in coating, metal material coating process, solid-state diffusion coating, etc., can solve the problems of high energy consumption, complex operation, environmental pollution, etc., and achieve low energy consumption, simple process, The effect of less environmental pollution

Inactive Publication Date: 2012-10-10
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

However, this production process seriously pollutes the environment, and the operation is extremely complicated and consumes a lot of energy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The raw material steel is designed with the following composition: C: 0.198%, Mn: 1.62%, Si: 0.028%, P: 0.018%, S: 0.0044%, Als: 0.033%.

[0033] After the smelting process is completed, the hot-rolled rough rolling temperature is 1040°C, the finish rolling temperature is 860°C, and the coiling temperature is 610°C. The tensile strength of the hot-rolled raw material is 585MPa, and the elongation is 29%. After pickling, cold rolling is 9 times of repeated rolling, and the distribution of rolling passes is as follows: 3.0→2.7→2.1→1.8→1.6→1.4→1.2→1.1→1.0→0.9mm, the total reduction rate is 70%, The tensile strength of the cold-rolled raw material is 985MPa, and the elongation is 5%.

[0034] After the cold-rolled raw material is uncoiled and slitting, it enters an electric resistance furnace for bluing. The bluing temperature is 630° C., and the bluing time is 130s. After bluing, it is cooled in the air, then waxed, dried, and coiled. The tensile strength of the blue str...

Embodiment 2

[0036] The raw material steel is designed with the following composition: C: 0.21%, Mn: 1.71%, Si: 0.026%, P: 0.018%, S: 0.0042%, Als: 0.04%.

[0037] After the smelting process is completed, the rough rolling temperature of hot rolling is 1120°C, the finishing rolling temperature is 900°C, the coiling temperature is 650°C, the tensile strength of the hot rolling raw material is 580 MPa, and the elongation is 30%. After pickling, cold rolling is 10 times of repeated rolling, and the distribution of rolling passes is as follows: 3.0→2.8→2.5→2.0→1.9→1.7→1.5→1.2→1.1→1.0→0.9mm, the total reduction ratio is 70 %, the tensile strength of cold-rolled raw materials is 1000MPa, and the elongation is 5.5%.

[0038] After the cold-rolled raw material is uncoiled and slitting, it enters an electric resistance furnace for bluing. The bluing temperature is 660°C, and the bluing time is 120 s. After bluing, it is cooled in the air, then waxed, dried, and coiled. The tensile strength of the...

Embodiment 3

[0040] The raw material steel is designed with the following composition: C: 0.19%, Mn: 1.66%, Si: 0.02%, P: 0.014%, S: 0.006%, Als: 0.05%.

[0041] After the smelting process is completed, the hot rolling rough rolling temperature is 1100°C, the finishing rolling temperature is 880°C, and the coiling temperature is 670°C. The tensile strength of the hot rolling raw material is 575MPa and the elongation is 28%. After pickling, cold rolling is 10 times of repeated rolling, and the distribution of rolling passes is as follows: 3.0→2.8→2.5→2.0→1.9→1.7→1.5→1.2→1.1→1.0→0.9mm, the total reduction ratio is 70 %, the tensile strength of the cold-rolled raw material is 980MPa, and the elongation is 6%.

[0042] After the cold-rolled raw material is uncoiled and slitted, it enters an electric resistance furnace for bluing. The bluing temperature is 650° C., and the bluing time is 150s. After bluing, it is cooled in the air, then waxed, dried, and coiled. The tensile strength of the bl...

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Abstract

The invention relates to a manufacturing method of high strength bluing strapping steel. The method includes the steps of smelting, hot rolling, cold rolling, uncoiling, striping, burring, bluing, cooling, waxing and drying. Steels free of alloying element of Nb are utilized to reduce the cost; the content of C is controlled to guarantee mechanical properties of products; the content of Mn is appropriately increased to improve the strength and hardness of raw materials and eliminate harmful effects of the S element to a greater extent; the content of Si is controlled to guarantee surface properties of the products; the contents of P and S are controlled to improve the purity of steels and reduce the possibility of brittle failures of products; and the content of Als is controlled to achieve the effects of refined grains and de-oxidation. The manufacturing method of the high strength bluing strapping steel has the advantages of being simple in process, low in cost and small in energy consumption and environmental pollution.

Description

technical field [0001] The invention relates to a production method of a strap, in particular to a production method of a high-strength blued strap. Background technique [0002] High-strength blued strapping is widely used for bundling and packaging of large coils of heavy hot-rolled coils and section steel, and its comprehensive performance requirements are relatively high: tensile strength is generally not less than 950MPa; elongation is not less than 11%; repeated bending times Not less than 8 times (R=5mm); there is a layer of uniform and dense Fe on the surface 3 o 4 Blue layer; no brittle fracture stratification. [0003] The patent with the publication number CN101781735A discloses a high-strength strapping steel with a tensile strength ≥ 1000 MPa and its manufacturing method. : ≤0.45%, P: ≤0.04%, S: ≤0.04%, Als: ≤0.04%. High-strength straps with a tensile strength of 1000-1200MPa and an elongation rate of 10-13% are produced by cold rolling and strengthening fol...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C33/04C21D8/02C23C8/10
Inventor 黄菲陶军晖王靓张兆丽何振华王丹
Owner 武汉钢铁有限公司
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