SK85 carbon tool steel

A technology of carbon tool steel and processing technology, which is applied in the field of strip steel production and processing, and can solve problems such as broken, poor coarse-grained structure, and unfavorable production of fine blanking parts

Pending Publication Date: 2021-11-09
湖北大帆金属制品有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, domestic and foreign high-strength yield series steels basically belong to fine-grained structural steels. After rolling with a large reduction, the internal

Method used

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  • SK85 carbon tool steel
  • SK85 carbon tool steel
  • SK85 carbon tool steel

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Embodiment Construction

[0033] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0034] A kind of processing technology of SK85 carbon tool steel, comprises the steps:

[0035]Step 1, prepare raw materials, select spring steel hot-rolled coils with the brand name of SK85, wherein the chemical composition of SK85 hot-rolled coils (refer to JIS G3311-2004) requires: C: 0.80 to 0.90, Si:≦0.35, Mn:≦0.50, P:≦0.030, S:≦0.030, Cr:≦0.30, Ni≦0.25, Cu≦0.25; the mechanical properties requirements of SK85 hot-rolled coils are: tensile strength:≦1050MPa; SK85 The metallographic requirements of hot-rolled coils are: ferrite + pearlite structure, decarburized layer, when the thickness is > 5mm, decarburization is allowed ≦ 1% t, where t is the thickness of the hot-rolled steel plate, when the thickness is ≦ 5m...

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Abstract

The invention relates to a processing technology of SK85 carbon tool steel. The processing technology of the SK85 carbon tool steel comprises the following steps of: selecting a hot-rolled coil plate with the mark of SK85, and carrying out stress relief annealing on the hot-rolled coil plate through a cover annealing furnace to obtain a hot-rolled stress relief annealed coil plate; carrying out acid pickling on the annealed coiled plate and preparing an acid-pickled coiled plate; and carrying out softening annealing on the acid pickling coiled plate through the cover type annealing furnace. The processing technology of the SK85 carbon tool steel has the beneficial effects that material surface scratching in the processing process of the carbon-content hot-rolled plate and cracks caused by edge stress concentration in the acid pickling and coiling process are prevented, spheroidizing annealing is conducted after the plate is rolled to the finished product size, the cold-rolled material is rolled to a state that broken and elongated flaky pearlite grains are recombined and transformed into uniformly distributed granular or globular pearlitic structures; the technology is suitable for normal proceeding of the follow-up fine blanking procedure, tissue preparation before quenching is conducted on punched parts, the product quality can be stabilized, the durability of products can be improved, the force value of the produced elastic parts is more stable, attenuation is small, and the service life is prolonged in a multiplied mode.

Description

technical field [0001] The invention relates to the technical field of strip steel production and processing, in particular to SK85 carbon tool steel. Background technique [0002] As we all know, strip steel is a narrow and long steel plate produced to meet the needs of different industrial sectors. Its width is generally within 300mm, but with economic development, there is no limit to the width. Strip steel is supplied in coils, with the advantages of high dimensional accuracy, good surface quality, easy processing, and material saving. It is widely used in the production of blanks for cold-formed steel, bicycle frames, wheels, clamps, washers, spring blades, saw blades and Blades and automotive fine blanking parts. [0003] With the development of the automobile industry, higher requirements are put forward for some important structural parts, especially high tensile strength under the premise of ensuring light weight of parts, and it is also suitable for fine punching...

Claims

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Application Information

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IPC IPC(8): C21D8/02C21D1/30C21D1/32C23G1/08C22C38/02C22C38/04C22C38/42C23F17/00
CPCC21D8/0205C21D8/0247C21D1/30C21D1/32C23G1/08C22C38/02C22C38/04C22C38/42C23F17/00C21D2211/005C21D2211/009
Inventor 宁立峥雷启文周成戈何茂华
Owner 湖北大帆金属制品有限公司
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