Production method of 260-330MPa low-alloy high-strength steel

A production method and low-alloy technology, applied in the production field of 260-330MPa grade low-alloy high-strength steel, can solve the problems of slow heating and cooling speed, fast heating and cooling speed, large difference in yield ratio, etc., and achieve a good combination of strength and plasticity , The effect of good cold forming performance and stable mechanical properties

Inactive Publication Date: 2015-09-23
TANGSHAN IRON & STEEL GROUP
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Problems solved by technology

At present, cold-rolled annealed low-alloy high-strength steel can be produced by bell annealing or continuous annealing, but these two annealing methods have different heat treatment characteristics. Fast, short heating time. This process characteristic determines that und

Method used

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  • Production method of 260-330MPa low-alloy high-strength steel
  • Production method of 260-330MPa low-alloy high-strength steel

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Example

[0024] Embodiment 1-5: The production method of the 260-330MPa grade low-alloy high-strength steel adopts the following composition ratio and specific process.

[0025] 1. The weight percent content of the chemical composition of the product in each embodiment and the thickness of the product are shown in Table 1, and the remainder is iron.

[0026] Table 1: Product chemical composition (wt%)

[0027]

[0028] 2. The specific process conditions of each embodiment are shown in Table 2.

[0029] Table 2: Process Conditions

[0030]

[0031] 3. The mechanical properties of the low-alloy high-strength steel obtained in each embodiment are shown in Table 3.

[0032] Table 3: Product mechanical properties

[0033]

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Abstract

The invention discloses a production method of 260-330MPa low-alloy high-strength steel. The low-alloy high-strength steel comprises the following chemical components by mass percentage: 0.05-0.09% of C, 0.15-0.60% of Mn, less than or equal to 0.015% of S, less than or equal to 0.020% of P, less than or equal to 0.50% of Si, less than or equal to 0.020% of Nb, less than or equal to 0.020% of Ti, 0.020-0.060% of Als, less than or equal to 30ppm of N, and the balance of Fe and unavoidable impurities. The method comprises the procedures of hot rolling, pickling, cold rolling, box annealing, leveling and rewinding. The low-alloy high-strength steel obtained by the method has yield strength of 260-330MPa, tensile strength of 350-430MPa, percentage elongation after fracture of greater than or equal to 26.0%, and good combination of strength and plasticity. The method achieves stable production of the product via optimal design of components, and can obtain the cold rolling low-alloy high-strength steel with stable mechanical properties and good cold forming performance.

Description

technical field [0001] The invention relates to a production method of high-strength steel, in particular to a production method of 260-330MPa grade low-alloy high-strength steel. Background technique [0002] Cold-rolled annealed low-alloy high-strength steel has high strength, but also good plasticity, low temperature toughness and weldability. Therefore, it is widely used in automobile structural parts and building structural parts. At present, cold-rolled annealed low-alloy high-strength steel can be produced by bell annealing or continuous annealing, but these two annealing methods have different heat treatment characteristics, such as bell annealing with slow heating and cooling rates and long heating times, while continuous annealing heating and cooling rates Fast, short heating time, this process feature determines that under the same composition, the grain size of the finished product after annealing in the two methods is very different, and the yield ratio is very ...

Claims

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Application Information

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IPC IPC(8): C22C38/14C22C38/12C22C38/06C21D8/02
Inventor 夏明生张洪波于世川杨杰孙力韩冰李桂兰解鸽邢振环弓俊杰
Owner TANGSHAN IRON & STEEL GROUP
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