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(1) control the sulfur content of the castings should be below 0.03%, and to avoid casting type â…¡ sulfide. (Sulfides in steel castings were three forms, namely â… , â…¡ and â…¢, type â…¡ sulfides alon g the grain boundaries was intermittent shaped, easily lead to the thermal cracking of castings.) By adjusting the Mn, S, than to change the distribution pattern of sulfur. steel casting foundry
(2) for carbon steel should be made of S + P ≤ 0.07%, because of the additive effect of sulfur and phosphorus, so that the hot cracking tendency to increase.
 (3) A1 deoxy residues A1 aluminum should be residual control ≤ 0.1%; excessive residual A1 is conducive to the formation A12S3 possibly even the formation of AlN, the fracture of the steel to show a "rocky", greatly reduced steel casting capacity of the thermal crack. steel castings manufacturers
(4) can refine the grain of the steel. Such as rare earth elements and calcium silicate in the liquid steel can deoxidation, desulfurization, and grain refinement. Determination of NiCrMoV steel: u nder the same conditions, the processing of liquid steel by rare-earth + calcium silicate, compared with untreated liquid steel, the crack resistance of more than 2 times higher.investment casting
steel castings