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A control method for pitting defects on the surface of ultra-low carbon phosphorus-containing BH steel hot-rolled strip

A control method and technology for hot-rolled strip, applied in the field of steel rolling, can solve the problems of iron sheet defects, low qualified rate of hot-rolled surface of outer plate, inability to meet the needs of high-end customer orders, etc., and achieve the effect of avoiding roll damage

Active Publication Date: 2021-04-27
BEIJING SHOUGANG CO LTD
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  • Claims
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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 qualification rate of the 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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  • A control method for pitting defects on the surface of ultra-low carbon phosphorus-containing BH steel hot-rolled strip
  • A control method for pitting defects on the surface of ultra-low carbon phosphorus-containing BH steel hot-rolled strip
  • A control method for pitting defects on the surface of ultra-low carbon phosphorus-containing BH steel hot-rolled strip

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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 method for controlling pitting defects on the surface of ultra-low-carbon phosphorus-containing BH steel hot-rolled strip steel. Scale, R2 adopts 1, 3, 5 passes for descaling, the descaling pressure is 18-25MPa, the end temperature of rough rolling is controlled at 1000-1040°C; the intermediate slab is subjected to finish rolling, and the entrance temperature of finish rolling is controlled at 990-1010°C . The invention realizes that the occurrence rate of pitting defects on the surface of the ultra-low carbon phosphorus-containing BH steel is reduced from more than 30% to less than 3%.

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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Patent Type & Authority Patents(China)
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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