' demands, we are available of stainless steels, carbon steels, alloy steels, alloy tool steels, 316L, 316, 304, 304L, 1.4432, 1.4462, 1.4301, 1.4404, 1.4418, F51, 2205, 25CrMo4, 42CrMo4, 16MnCr5, Ck45, P280GH, 40Cr, 41Cr4, 17CrNiMo6, 34CrNiMo6, ST52-3, S355J2, S355J2G3, S355JR ,1.2379, Mo12Cr1V1, etc.Heat treatment:?Annealing, Normalizing, Quenching+Tempering(Q+T), Hardening, etc.Ring sizes:?From 20mm to 4000mm.Weight:From 1kg/pc to 10,000kg/pc.