SK85 carbon tool steel

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...

AI Technical Summary

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 grains are severely broken, and abnormal coarse-grained structures are often produced after annealing, which is very unfavorable for fine blanking. Production of parts

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