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Control method of surface pit detect of ultra-low-carbon phosphorus-containing BH steel hot-rolled strip steel

A hot-rolled strip steel and control method technology, which is applied in the field of steel rolling, can solve problems such as iron sheet defects, inability to meet high-end customer order requirements, and low qualified rate of hot-rolled outer plate surfaces

Active Publication Date: 2019-08-30
BEIJING SHOUGANG CO LTD
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AI Technical Summary

Problems solved by technology

The oxidation peak of this steel is around 990°C, so iron sheet defects are most likely to form around 990°C
Due to pitting defects, the qualified rate of hot-rolled outer plate surface of this type of steel is extremely low, only about 60-70%, which cannot meet the order requirements of high-end customers

Method used

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  • Control method of surface pit detect of ultra-low-carbon phosphorus-containing BH steel hot-rolled strip steel
  • Control method of surface pit detect of ultra-low-carbon phosphorus-containing BH steel hot-rolled strip steel
  • Control method of surface pit detect of ultra-low-carbon phosphorus-containing BH steel hot-rolled strip steel

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Embodiment Construction

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0025] The core of the present invention is a method for controlling pitting defects on the surface of an ultra-low carbon phosphorus-containing BH steel hot-rolled steel strip. The chemical composition of the ultra-low-carbon phosphorus-containing BH steel hot-rolled steel strip is: in mass percentage, C: 0.0015~0.0027%, Si≤0.03%, Mn: 0.50~0.70%, P: 0.030~0.045%, S: 0.005~0.015%, Alt: 0.035~0.065%, Nb: 0.0030~0.0080%, Ti: 0.0020 ~0.0060%, B: 0.0005~0.0012%, N...

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Abstract

The invention discloses a control method of surface pit defect of ultra-low-carbon phosphorus-containing BH steel hot-rolled strip steel. The method is characterized by comprising the following steps:carrying out rough rolling on a slab to obtain an intermediate blank, wherein descaling is carried out in a rough rolling region R1, one or three or five passes of descaling are adopted in the roughrolling region R2, the descaling pressure is 18-25 MPa, and the rough rolling end temperature is controlled to be 1000-1040 DEG C; and carrying out finish rolling on the intermediate blank, wherein the finish rolling inlet temperature is controlled to be 990-1010 DEG C. According to the method disclosed by the invention, the occurrence rate of the surface pit defect of the ultra-low-carbon phosphorus-containing BH steel is reduced from 30% or over to 3% or less.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a method for controlling pitting defects on the surface of ultra-low carbon phosphorus-containing BH steel hot-rolled strip steel. Background technique [0002] Bake-hardening steel plate (BH steel plate) for automobile is a kind of high-quality automobile with low yield strength before stamping and forming. After stamping or pre-stretching deformation, the yield strength can be improved to a certain extent by baking paint temperature aging treatment. Use a steel plate. Ultra-low carbon BH steel is mainly single-Nb-strengthened, single-Ti-strengthened, or Nb-Ti-strengthened series products. The design idea of ​​such components is to adjust the product strength level through Si, Mn, and P elements. The elements cooperate with each other to adjust the fluctuation range of the BH value of the final product. Because of its excellent performance, it is widely used in exterior ...

Claims

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Application Information

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IPC IPC(8): B21B45/00B21B45/04B21B45/08B21B37/56B21B37/74B21B37/44B21B37/28C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
CPCB21B37/28B21B37/44B21B37/56B21B37/74B21B45/004B21B45/04B21B45/08C22C38/001C22C38/002C22C38/004C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 焦会立焦晋沙王伦罗旭烨王明哲陈瑾
Owner BEIJING SHOUGANG CO LTD
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