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Cold-rolling and stamping-use steel with excellent planar isotropy and 180 MPa-level yield strength and manufacturing method thereof

An isotropic, yield strength technology, applied in the field of automotive interior and exterior panels, can solve the problems of complex parts stamping and unsatisfactory, achieve the effect of improving deep drawing performance, improving plasticity, and eliminating yield platform phenomenon

Active Publication Date: 2016-04-13
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, products with isotropic properties are mainly designed with 0.01-0.05% C, and the yield strength is at the level of 220MPa, 260MPa and 300MPa, which cannot meet the stamping of parts with more complex forming.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Cold-rolled stamping steel 1 with plane isotropy and excellent yield strength of 180MPa. The raw materials of cold-rolled stamping steel are: C: 0.0050%, Mn: 0.20%, ALs: 0.04%, Nb: 0.010%, Si: 0.03%, P: 0.010%, N: 0.001%, Ti: 0.006%, and the balance is Fe and unavoidable impurities; the cold-rolled stamping steel 1 is processed through slab heating, high-temperature rolling, cooling coiling, and cold rolling. , continuous annealing, and smoothing are prepared in six steps, among which,

[0031] 1) During the slab heating process, the soaking temperature of the slab is 1280°C;

[0032] 2) During the high-temperature rolling process, the rolling starts at 1100°C, the finishing temperature of hot rolling is 910°C, and the rolling thickness is 3.5mm;

[0033] 3) During the cooling and coiling process, the steel plate is cooled to 720°C by spraying water for coiling;

[0034] 4) During the cold rolling process, the steel coil is naturally cooled to 35°C, uncoiled and pickl...

Embodiment 2

[0039]Cold-rolled stamping steel 2 with excellent plane isotropic yield strength of 180MPa. The raw materials of cold-rolled stamping steel are: C: 0.0040%, Mn: 0.30%, ALs: 0.02%, Nb: 0.020%, Si: 0.013%, P: 0.015%, N: 0.002%, Ti: 0.008%, and the balance is Fe and unavoidable impurities; The five steps of rolling and high-temperature coiling are prepared, among which,

[0040] 1) During the slab heating process, the soaking temperature of the slab is 1260°C;

[0041] 2) During the high-temperature rolling process, the rolling starts at 1100°C, the finishing temperature of hot rolling is 900°C, and the rolling thickness is 4.0mm;

[0042] 3) During the cooling and coiling process, the steel plate is cooled to 710°C by spraying water for coiling;

[0043] 4) During the cold rolling process, the steel coil is naturally cooled to room temperature, uncoiled and pickled to remove the surface oxide scale, and cold-rolled with a total reduction rate of 80%, with a rolling thickness o...

Embodiment 3

[0048] Cold-rolled stamping steel 2 with excellent plane isotropic yield strength of 180MPa, the raw materials of cold-rolled stamping steel are: C: 0.0060%, Mn: 0.10%, ALs: 0.06%, Nb: 0.015%, Si: 0.01%, P: 0.008%, N: 0.002%, Ti: 0.006%, and the balance is Fe and unavoidable impurities; The five steps of rolling and high-temperature coiling are prepared, among which,

[0049] 1) During the slab heating process, the soaking temperature of the slab is 1300°C;

[0050] 2) During the high-temperature rolling process, the rolling starts at 1100°C, the finishing temperature of hot rolling is 910°C, and the rolling thickness is 3.0mm;

[0051] 3) During the cooling and coiling process, the steel plate is cooled to 730°C by spraying water for coiling;

[0052] 4) During the cold rolling process, the steel coil is naturally cooled to room temperature, uncoiled and pickled to remove the surface oxide scale, and cold-rolled with a total reduction rate of 80%, with a rolling thickness o...

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Abstract

The invention discloses cold-rolling and stamping-use steel with excellent planar isotropy and a manufacturing method thereof. The cold-rolling and stamping-use steel is applied to covering parts of inner and outer parts of automobiles, and is characterized by comprising the following raw materials by weight percent: 0.0040-0.0060% of C, 0.10-0.20% of Mn, 0.03-0.04% of ALs, 0.010-0.015% of Nb, 0.010-0.020% of Si, 0.002-0.012% of P, 0.001-0.003% of N, and (48 / 14) % of N or more and 0.010% or less of Ti, with the balance being Fe and unavoidable impurities. The cold-rolling and stamping-use steel provided by the invention has 180 MPa-level yield strength and excellent deep drawability, and has the characteristic that delta r is smaller than or equal to 0.20.

Description

technical field [0001] The present invention specifically refers to a cold-rolled stamping steel with excellent planar isotropy and a manufacturing method thereof. The cold-rolled stamping steel is applied to automobile interior and exterior panels. Background technique [0002] Isotropic steels (IS, isotropystee1) have low △r values ​​(△r: (r 0 + r 90 -2r 45 ) / 2), the material flows stably and coordinates with each other in all directions during forming, which is conducive to obtaining good formability, especially for stamping cup-shaped objects, the wall thickness is uniformly thinned and the ear is small, and it is mostly used for batteries Punching of shells and automobile outer panels. At present, products with isotropic properties are mainly designed with 0.01-0.05% C, and the yield strength is at the level of 220MPa, 260MPa and 300MPa, which cannot meet the stamping of parts with more complex forming. There is a need for a steel plate with excellent deep drawing p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/06C22C38/12C22C38/14C21D8/02
CPCC21D8/0226C21D8/0236C21D8/0242C21D8/0247C22C38/004C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 孙方义刘祥东胡宽辉杜小峰冯冠文彭涛
Owner 武汉钢铁有限公司
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