Stone material cutting saw blade steel and its manufacturing method

Abstract

This invention relates to a type of steel used for saw blade for stone slotting. Account for weight the chemical composition is: C 0.45-0.60,Si 0.10- 0.60,Mn 1.30-1.80,P<=0.02,S<=0.01,V 0.05-0.20,Cr 0.15-0.30, N 0.005-0.020,Ca 0-0.0050,Al 0.005-0.040, and the rest is Fe and inevitable impurity. The process includes steps as follows: smelting, casting,; continuous casting billet use heat sending and heat packing , ensure the temperature keep above 300DEG C before it be send into plate body for heating; keep temperature for plate body heating above 1150DEG C,temperature for hot rolling above 900DEG C; cooling after rolling, then coiling, keep the coiling temperature above 700DEG C. This invention has higher hardenability then midst-carbon and low-alloy steel, especially refer to make large saw blade which diameter is above 1000mm.

Description

technical field

[0001] The invention relates to a medium-carbon, low-alloy steel, in particular to a steel for a large saw blade with a diameter of more than 1000mm for cutting stone and a manufacturing method thereof. Background technique

[0002] The thickness of the steel plate used for stone cutting saw blades is usually 2-10mm. The coiled plate is produced by a hot rolling mill. After the coiled plate is flattened, the user performs cutting processing, and then performs quenching and tempering heat treatment to obtain a hardness above HRC40, which is usually maintained at HRC41~45, so that the saw blade steel has good toughness while having a certain cutting hardness. At present, the commonly used steel grades on the market are 65Mn and 75Cr1, and their chemical compositions are shown in Table 1.

[0003] steel type C Si mn P S Cr 65Mn 0.62～0.70 0.17～0.37 0.90～1.20 ≤0.015 ≤0.010 0.00 ...

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