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A kind of 800mpa heat-based zinc-aluminum-magnesium coating composite phase steel and its preparation method

An 800mpa, multi-phase steel technology, applied in hot-dip plating, coating, metal rolling, etc., can solve problems such as accelerated failure, failure to meet local formability requirements of chassis parts, and failure to meet corrosion resistance requirements. Achieve outstanding corrosion resistance, excellent strong plasticity and local formability, and reduce the effect of cooling temperature inhomogeneity

Active Publication Date: 2022-06-21
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chassis parts are exposed to the outside all the year round, and will accelerate failure in the atmospheric environment. Conventional hot-rolled or pickled multi-phase steel plates can no longer meet the corrosion resistance requirements
However, if cold-rolled galvanized multi-phase steel is used instead of hot-rolled multi-phase steel, the stringent local formability requirements of chassis parts cannot be met.

Method used

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  • A kind of 800mpa heat-based zinc-aluminum-magnesium coating composite phase steel and its preparation method
  • A kind of 800mpa heat-based zinc-aluminum-magnesium coating composite phase steel and its preparation method
  • A kind of 800mpa heat-based zinc-aluminum-magnesium coating composite phase steel and its preparation method

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preparation example Construction

[0087] According to another typical embodiment of the present invention, a preparation method of 800MPa grade heat-based zinc-aluminum-magnesium-coated composite phase steel is provided, such as Figure 5 As shown, the preparation method includes:

[0088] S1. obtaining the slab of the 800MPa-grade hot-base zinc-aluminum-magnesium-coated complex phase steel;

[0089] S2. The slab is subjected to pre-rolling heating, rough rolling, finishing rolling, post-rolling cooling and coiling to obtain a hot-rolled coil;

[0090] S3. uncoiling and pickling the hot-rolled coil is carried out to obtain a pickling plate;

[0091] S4. hot-dip galvanizing aluminum-magnesium on the pickled plate, and post-cooling (cooling to below 80°C at a cooling rate of 5-8°C / s) to obtain the 800MPa-grade hot-base zinc-aluminum-magnesium-coated complex phase steel;

[0092] The post-rolling cooling adopts the mode of water cooling in the front section and air cooling in the rear section, the cooling rate ...

Embodiment

[0114] An 800MPa grade heat-based zinc-aluminum-magnesium-coated complex phase steel is prepared by the following method:

[0115] (1) A slab with a thickness of 237 mm was obtained.

[0116] (2) Hot rolling: the slab is heated to 1230℃~1270℃, and the heating time is 210min~260min, and then rough rolling and finishing rolling are performed, wherein the end temperature of the rough rolling is 1040℃~1100℃, and the The finishing rolling temperature of finish rolling is 880°C to 940°C.

[0117] (3) Cooling and coiling after rolling: adopt the mode of water cooling in the front section + air cooling in the rear section. The temperature is 10℃ / s~20℃ / s, the end temperature of air cooling is 450℃~500℃, the coiling temperature is 450℃~500℃, and the thickness of the hot-rolled coil is 2.0~3.5mm.

[0118] (4) Pickling: uncoiling pickling, the elongation of the scale breaker is 0.5% to 0.7%, and the temper rolling force is 2000N to 4000N.

[0119] (5) the above-mentioned pickling plate...

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Abstract

The invention provides an 800MPa heat-based zinc-aluminum-magnesium-coated multiphase steel, which belongs to the technical field of advanced high-strength steel manufacturing for automobiles. In terms of mass fraction, the chemical composition of the multiphase steel is: C: 0.05% to 0.12% , Si: 0.05% to 0.85%, Mn: 1.4% to 2.0%, Al: 0.01% to 0.08%, P: 0 to 0.008%, S: 0 to 0.001%, N: 0 to 0.008%, component A, component B, component C, the rest is Fe and unavoidable impurities. The multi-phase steel has high strength, good formability and excellent corrosion resistance, and is suitable for the manufacture of various automobile chassis parts. The invention also provides a preparation method of 800MPa heat-based zinc-aluminum-magnesium coated multiphase steel.

Description

technical field [0001] The invention belongs to the technical field of manufacturing advanced high-strength steel for automobiles, and in particular relates to an 800 MPa grade heat-based zinc-aluminum-magnesium-coated complex phase steel and a preparation method thereof. Background technique [0002] In recent years, the application types, proportions and strength levels of advanced high-strength steels in the body have gradually increased. Among these high-strength steels, multi-phase steels are widely used in the manufacture of various parts that require high local formability, such as seats, due to their high plasticity and excellent flanging, bending and hole reaming properties. Slide rails, chassis structural parts and suspension parts, etc. Among them, chassis parts are non-surface parts, which do not have high requirements on the surface quality of steel plates, but have very high requirements on local forming properties such as bending and reaming, so they are usua...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06B21B1/02C21D8/02C22C33/04C23C2/06C23C2/40
CPCC22C38/02C22C38/04C22C38/06C22C38/001C22C33/04B21B1/02C21D8/0205C21D8/0226C21D8/0263C23C2/06C23C2/40B21B2001/028
Inventor 邹英韩赟朱国森滕华湘邱木生阳锋刘华赛谢春乾陈洪生姜英花王松涛李飞章军
Owner SHOUGANG CORPORATION