Medium-high carbon hot rolled strip steel with excellent fine blanking performance and production method

A hot-rolled strip steel and production method technology, applied in the field of steel for auto parts, can solve the problems of large temperature difference between the inside and outside of the steel coil, low yield of steel strip, and large difference in cooling speed, etc., and achieve excellent punching performance and improved Effect of sulfide inclusion and energy saving

Active Publication Date: 2015-11-04
武汉钢铁有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the method described in the patent CN 103003463A adopts the slow cooling of the heat preservation cover, the temperature difference between the inside and the outside of the steel coil is large, and the differ

Method used

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  • Medium-high carbon hot rolled strip steel with excellent fine blanking performance and production method
  • Medium-high carbon hot rolled strip steel with excellent fine blanking performance and production method
  • Medium-high carbon hot rolled strip steel with excellent fine blanking performance and production method

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Embodiment Construction

[0051] Below in conjunction with accompanying drawing and specific embodiment the present invention will be described in further detail:

[0052] Chemical composition design:

[0053] The chemical composition and weight percentage of the steel strip are: C: 0.50-0.65%, Si: 0.60-1.50%, Mn: 0.50-1.70%, Ca: 0.0030-0.0070%, B: 0.0008-0.005%, Als: 0.015 ~0.030%, P≤0.015%, S≤0.008%, and the rest are Fe and unavoidable impurities.

[0054] The process flow is as follows:

[0055] 1) Smelting and continuous casting into billets;

[0056] 2) Slowly cool the slab, and the slow cooling time is not less than 72 hours;

[0057] 3) Heating the slab, the heating temperature is controlled at 1200-1280°C, and the time in the furnace is 300-400min;

[0058] 4) Carry out high pressure water descaling;

[0059] 5) Hot rolling: control the finishing temperature of rough rolling at 980-1100°C, and the reduction ratio is not lower than 80%; control the finish rolling temperature at A c3 +30℃~A...

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Abstract

The invention discloses medium-high carbon hot rolled strip steel with excellent fine blanking performance and a production method. The strip steel comprises chemical components in percentage by weight as follows: 0.50%-0.65% of C, 0.60%-1.50% of Si, 0.50%-1.70% of Mn, 0.0030%-0.0070% of Ca, 0.0008%-0.005% of B, 0.015%-0.030% of Als, smaller than or equal to 0.015% of P, smaller than or equal to 0.008% of S and the balance of Fe and inevitable impurities. According to the principle that the activity of carbon atoms in austenite is improved by the Si element, a fast spheroidizing annealing technology is adopted, the heat preservation time is shortened to 1h-2h at the annealing temperature, the cost is reduced, the energy is saved, and the hot rolled strip steel with the excellent blanking performance is obtained finally and is suitable for producing automobile part raw materials with complex shapes and quench hardening requirements.

Description

technical field [0001] The invention relates to the technical field of steel for auto parts, in particular to a medium-high carbon hot-rolled steel strip with excellent fine blanking properties and a production method. Background technique [0002] Modern auto parts such as gears, gearboxes, shift forks, leaf springs and other structures with complex shapes have gradually changed from the previous methods of casting, cutting, heat treatment, and finishing to one-time punching with materials with excellent punching properties. forming. The characteristics of the steel plate with excellent punching performance are: (1) suppress the material cracks at the cutting edge of the die, and obtain a shear surface with a processing surface of more than 85%; (2) good dimensional accuracy; (3) uniform and appropriate hardness, that is, It can't be too high to reduce the life of the mold, and it can't be too low to cause "knife sticking". It is usually required that the structure is in ...

Claims

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Application Information

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IPC IPC(8): C22C38/06C22C33/04
Inventor 程吉浩刘文斌董中波郭斌胡海刘敏邹德辉
Owner 武汉钢铁有限公司
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