Features:1) Specification: φ50 - 200mm2) Hot rolling craftwork, hot forging and fine mechanical performance3) Chemical components meet standards, delivery in black skin4) Standards: a) JIS: SNCM439 (SNCM8) b) ASTM: AISI 4340 c) French standard: 20NCD25) Used for manufacturing gear wheels of automobiles and tractors, teeth wheel drills used for petrol drilling, high level quenching and tempering rims on the automobilesPacking: Packed with iron wires producing area:China payment:L/C, T/T supplying capacity:500,000MT/year