... length no more than 5m3,mim dia over 150mmcylinder forging 1,min OD around 150mm2,weight of single piece ... same requirements. (1),among the free forgings carbon steel forgings are generally the better choice for the sake ... "Classification Society".(6),we usualy use material of steel type of 15#,20#,25#,30#.35#,40#,45 ... clear requirements we can render excellent heat treatment. alloy steel forging parts