Steel for large-diameter thin saw blade substrate and manufacturing method thereof

Abstract

The invention discloses steel for a large-diameter thin saw blade substrate and a manufacturing method thereof; the steel comprises the chemical composition by the weight percentage: 0.72%-0.95% of C, 0.06%-0.40% of Si, 0.5%-0.95% of Mn, 0.10%-0.39% of Cr, 0.03%-0.080% of V, not more than 0.5% of Ni, not more than 0.0002% of H, not more than 0.015% of impurity element P, not more than 0.010% of impurity element S, not more than 0.010% of impurity element Al, and the balance Fe and inevitable impurities. Molten steel is deoxidized by Si; a plate blank adopts a hot feeding and hot charging process; the initial rolling temperature of finish rolling is 1050-1150 DEG C, and the finishing rolling temperature of the finish rolling is 900-980 DEG C; laminar cooling adopts rear-section cooling, the plate blank is cooled to 680-800 DEG C and then coiled, and the plate blank enters a slow cooling pit within 30 minutes after coiling and is slowly cooled; hot rolled strip steel is cold-punched into a saw blade matrix, and then the saw blade matrix is heated to 850-980 DEG C, is subjected to heat preservation for 10-40 min and is quenched. The steel for saw blades has the advantages of high hardenability, high thermal stability, high toughness and obviously improved service life.

Description

technical field [0001] The invention relates to a steel for a saw blade base body, in particular to a steel for a saw blade base body with a diameter greater than 1800 mm and a thickness of 3 to 7 mm for mining and a production method thereof. Background technique [0002] In recent years, due to the rapid development of the mining industry, the demand for large saw blades for mining has increased sharply, especially the demand for large saw blades with thin specifications has increased significantly. Generally, saw blades with a diameter greater than 1800mm use steel plates with a thickness of more than 7mm to ensure the strength and toughness of the saw blade base, and use a thin saw blade base with a thickness less than 7mm to make large-diameter saw blades. The weight of the saw blade base is small, which not only saves raw materials but also Easy to install; the cutter head of the thin saw blade substrate is also thinned accordingly, saving raw materials and reducing th...

AI Technical Summary

Problems solved by technology

Containing Ni and higher Mn elements, the cost is higher, and it is prone to defects such as segregation, which affects the service life

[0007] The patent "CN104178691A A high-strength metallurgical saw blade steel and its manufacturing method" discloses the chemical composition: C: 0.30% to 0.60%, Si: 0.15% to 0.30%, Mn: 1.35% to 1.9%, V: 0.070% ~0.19%, Al: 0.025%~0.055% heat-treated steel plate, the hardness of the finished steel plate after quenching and tempering is 28~40HRC, which cannot meet the toughness requirements of large-diameter saw blades, and is not suitable for direct processing to produce saw blade substrates with a diameter of 1500mm or more

[0008] The steel types mentioned in the above documents and inventions are not suitable for the development requirements of the current mining large-diameter thin saw blade industry

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