Since 1958, Sun Steel Treating Inc. has specialized in providing our customers precision and specialty Salt Bath Heat Treatments. Whether it's hardening alloys, carbon steels, tool steels or high speed specialty tools, our engineers know the precise metallurgical processes to apply to your steels. Sun Steel Treating also offers Ionitriding® (ion nitriding or plasma nitriding), salt bath hardening, salt bath heat treating and steam treating.