Production method of high-strength saw bit steel coil

Abstract

The invention provides a production method of a high-strength saw bit steel coil. The production method is suitable for a rolled steel coil of saw bit or saw blade steel with the thickness of 3.0-14.0mm. The component design comprises 0.49-0.52 of C, 0.2-0.35 of Si, 1.45-1.60 of Mn, less than or equal to 0.015 of P, less than or equal to 0.005 of S, 0.2-0.25 of Cr, 0.12-0.16 of V, 0.020-0.025 of Al and less than or equal to 0.006 of N by weight percent. The production process adopts a converter smelting-LF (ladle furnace) refining-hot continuous rolling process and comprises slab continuous casting and segregation control in saw bit steel production, control of the slab continuous offline slow cooling temperature of the saw bit steel and the control of the roll rolling start temperature, the rolling finished temperature and the coiling temperature. The horizontal yield of the saw bit steel coil is MPa600-750, the horizontal tensile strength is MPa930-1040, the elongation is 19.5-26%, and the hardness of HRC is 20-28.

Description

technical field [0001] The invention relates to the field of iron and steel smelting and processing, and is especially suitable for controlling production elements such as component design, slab continuous casting, slab cooling, heat preservation, furnace charging temperature, and steel controlled rolling. Background technique [0002] Traditional saw blade (saw blade) base steel is mostly smelted in electric furnace (converter furnace), LF refining, pouring, etc. The continuous casting process is prone to hot cracks, and the cooling rate of the billet is too high or the cooling is uneven, which will lead to the breakage of the billet. The rolling process can only hot-roll the slab. At the same time, due to the high strength of the steel plate, the yield strength reaches 600-750MPa. The requirements for equipment are high, and the shape of the steel plate is not easy to control, especially after the steel coil is flattened, the shape of the steel coil has defects such as war...

AI Technical Summary

Problems solved by technology

The continuous casting process is prone to hot cracks, and the cooling rate of the billet is too high or the cooling is uneven, which will lead to the breakage of the billet. The rolling process can only hot-roll the slab. At the same time, due to the high strength of the steel plate, the yield strength reaches 600-750MPa. The requirements for equipment are high, and the shape of the steel plate is not easy to control, especially after the steel coil is flattened, there are defects such as warping and wave shape, which bring difficulties to the processing

After cross-cutting, the lumber rate is low and the overall cost is high

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