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Manufacturing method of high-surface-grade hot-rolled pickled dual-phase steel

A technology of hot-rolled pickling and manufacturing methods, applied in the direction of manufacturing tools, metal rolling, metal rolling, etc., can solve the problems of high occurrence rate, increased production cost, pattern, etc., and achieve low cost and good versatility Effect

Active Publication Date: 2019-07-12
SD STEEL RIZHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the addition of a large amount of alloying elements to the surface of the hot-rolled steel plate, a composite oxide structure will be formed and penetrate into the steel base, making it difficult to remove the surface oxide scale; During transportation, foreign matter and corrosion are serious, and a large number of surface defects are exposed after pickling, which has a great impact on users
At present, the hot-rolled pickling dual-phase steel supplied by major domestic iron and steel enterprises has defects such as surface pits, pits, scale indentation, surface blackening, and patterns, etc. The incidence rate is high, and the yield loss after removal is more than 4%. , increase production costs and cause inconvenience to users

Method used

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  • Manufacturing method of high-surface-grade hot-rolled pickled dual-phase steel
  • Manufacturing method of high-surface-grade hot-rolled pickled dual-phase steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method of manufacturing hot-rolled pickled dual-phase steel with a high surface grade, and the production specification is 3.2mm;

[0021] Its manufacture method comprises the following steps:

[0022] (1) The temperature of the heating furnace is controlled within a certain accuracy range.

[0023] (2) Descaling for all rough rolling passes and rolling at a specified speed for each pass.

[0024] (3) The coiling process is controlled according to the two-stage cooling temperature, and the coiling temperature, coiling tension and side guide plate pressure are controlled within the required range.

[0025] (4) After the coiling is completed, send the pickling process within the specified time range.

[0026] (5) Pickling adopts pickling and leveling process to ensure that the pickling speed, corrosion inhibitor concentration, drying distance and temperature, and leveling reduction rate are within the required range.

[0027] Specifically, the temperature of the step...

Embodiment 2

[0034] A method for manufacturing hot-rolled pickled dual-phase steel with a high surface grade, and the production specification is 4.2mm;

[0035] Its manufacture method comprises the following steps:

[0036] (1) The temperature of the heating furnace is controlled within a certain accuracy range.

[0037] (2) Descaling for all rough rolling passes and rolling at a specified speed for each pass.

[0038] (3) The coiling process is controlled according to the two-stage cooling temperature, and the coiling temperature, coiling tension and side guide plate pressure are controlled within the required range.

[0039] (4) After the coiling is completed, send the pickling process within the specified time range.

[0040] (5) Pickling adopts pickling and leveling process to ensure that the pickling speed, corrosion inhibitor concentration, drying distance and temperature, and leveling reduction rate are within the required range.

[0041] Specifically, the temperature of the ste...

Embodiment 3

[0048] A method for manufacturing hot-rolled pickled dual-phase steel with a high surface grade, and the production specification is 5.2mm;

[0049] Its manufacture method comprises the following steps:

[0050] (1) The temperature of the heating furnace is controlled within a certain accuracy range.

[0051] (2) Descaling for all rough rolling passes and rolling at a specified speed for each pass.

[0052] (3) The coiling process is controlled according to the two-stage cooling temperature, and the coiling temperature, coiling tension and side guide plate pressure are controlled within the required range.

[0053] (4) After the coiling is completed, send the pickling process within the specified time range.

[0054] (5) Pickling adopts pickling and leveling process to ensure that the pickling speed, corrosion inhibitor concentration, drying distance and temperature, and leveling reduction rate are within the required range.

[0055] Specifically, the temperature of the step ...

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Abstract

The invention relates to a steel metallurgy hot continuous rolling strip steel production process, in particular to a manufacturing method of high-surface-grade hot-rolled pickled dual-phase steel. The manufacturing method of the high-surface-grade automobile dual-phase steel aims to overcome defects in the prior art and is low in production cost and high in control method operability, and the surface quality is close to the cold and hard roll level. According to the technical scheme adopted by the manufacturing method to solve the technical problems, under the premise of ensuring the stable performance of a hot rolled plate, technological parameters of heating, rough rolling, reeling and pickling processes are reasonably set, the defects, caused by existing process conditions, of surfaceiron oxide sheets, pocks and pits are overcome, traditional slab heating, laminar cooling and pickling paths and processes are changed, and a hot-rolled pickled dual-phase steel product with a high surface quality grade is obtained.

Description

technical field [0001] The invention relates to the production process of iron and steel metallurgical hot continuous rolling strip steel, in particular to a method for manufacturing hot-rolled pickling dual-phase steel with high surface grade. Background technique [0002] Hot-rolled dual-phase steel is a high-tech variety of hot-rolled automotive steel, which is mainly used for stamping the spokes of automobiles. The steel for high-grade automobiles such as BMW and Mercedes-Benz not only has strict requirements on stamping performance, but also has very strict requirements on surface quality. Generally, it is required to pickle the surface oxide scale after hot rolling before delivery. High-level automobile manufacturers Surfaces are required to be delivered with zero defects. Hot-rolled dual-phase steel, such as DP600, generally needs to add SI, Mn, Cr, Mo and other alloying elements to ensure a reasonable two-phase structure to ensure process performance. Due to the ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/22B21B45/02B21B45/04B21B45/00C21D8/02C23G1/04C23G1/08
CPCB21B1/22B21B45/004B21B45/0203B21B45/0269B21B45/04C21D8/0226C21D8/0263C21D8/0278C23G1/04C23G1/08
Inventor 雷凯汤化胜李国宝郭朝海李向前单修迎贾崇雪王南辉夏纪年于爽杨贵玲王克柱
Owner SD STEEL RIZHAO CO LTD