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Pickling method of complex phase steel

A technology of complex-phase steel and pickling, applied in the field of steel rolling, can solve problems such as spots and flaky black spots on the head

Active Publication Date: 2019-11-05
BEIJING SHOUGANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies in the prior art above, the present invention discloses a pickling method for multiphase steel to solve the problem that dots and flaky black spots tend to appear on the head of multiphase steel after pickling

Method used

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  • Pickling method of complex phase steel
  • Pickling method of complex phase steel
  • Pickling method of complex phase steel

Examples

Experimental program
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Effect test

Embodiment 1

[0042] In the first embodiment, the threading speed is controlled to 40m / min, the running speed is controlled to 90m / min, and the tail flick speed is controlled to 40m / min. Table 1 is the parameter control range of the hydrochloric acid concentration and temperature in the first embodiment.

[0043] Table 1

[0044] project The first pickling tank The second pickling tank The third pickling tank The fourth pickling tank The fifth pickling tank Concentration setting value, g / L426585105140 Actual concentration range, g / L 41~43 64~66 84~86 103~107 138~142 Temperature setting value, ℃8482787875 Actual temperature range, ℃ 82~85 80~85 76~80 75~80 73~78

Embodiment 2

[0046] In the second embodiment, the threading speed is controlled to 60m / min, the running speed is controlled to 70m / min, and the tail flick speed is controlled to 50m / min. Table 2 is the concentration and temperature of the hydrochloric acid in the pickling tank of the second embodiment. Control range.

[0047] Table 2

[0048] project The first pickling tank The second pickling tank The third pickling tank The fourth pickling tank The fifth pickling tank Concentration setting value, g / L457893110150 Actual concentration range, g / L 43~48 75~80 90~95 108~113 147~152 Temperature setting value, ℃7878777572 Actual temperature range, ℃ 75~80 75~80 73~80 72~78 70~74

[0049] Through the pickling method of Example 1 and Example 2, the straightening machine can fully crush and peel the oxide scale on the surface of the steel strip, and at the same time straighten the wave shape and other plate defects of the steel strip, which is a smooth and stable pickling. Provides a good guar...

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Abstract

The invention discloses a pickling method of complex phase steel. The method comprises pickling. A steel strip passes a first pickling groove, a second pickling groove, a third pickling groove, a fourth pickling groove and a fifth pickling groove arranged successively. Hydrochloric acid solutions are contained in the first pickling groove, the second pickling groove, the third pickling groove, thefourth pickling groove and the fifth pickling groove. Concentrations of hydrochloric acid are successively 40-50 g / L, 60-80 g / L, 80-100 g / L, 100-120 g / L and 130-160 g / L. Temperatures of hydrochloricacid are successively 75-85 DEG C, 73-83 DEG C, 70-80 DEG C, 70-80 DEG C and 70-80 DEG C. The pickling method reduces the probability of black spots and under-pickling quality defect in the pickling process greatly, is good in application effect, can lower the production cost greatly, improves the market competitiveness of a product and has good application value.

Description

Technical field [0001] The invention belongs to the technical field of steel rolling, and particularly relates to a pickling method for complex phase steel. Background technique [0002] With the increasingly stringent requirements of the automotive industry for lightweight, safety, and low emissions, the proportion of advanced high-strength steel used in new automotive models continues to increase. 800MPa hot-rolled pickled multiphase steel not only has high tensile strength, but also has high hole expansion performance and good welding performance. It can be widely used in the production of automobile chassis suspension parts, bumpers, seat slides and other parts , Has broad development prospects. However, the production of 800MPa grade complex phase steel is difficult, the product certification cycle is long, and the market access threshold is high. There are almost no domestic steel companies that have passed the certification of foreign high-end automobile manufacturers. [...

Claims

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Application Information

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IPC IPC(8): C23G1/08
CPCC23G1/08
Inventor 宋春华王凤美马朋亮赵志刚李强郭子峰吕宝锋李玉鹏
Owner BEIJING SHOUGANG CO LTD
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