ductile iron k9 tube OD:6-1000mm WT:1-1200mm Series:200/300/400 Seamless.welded,hot rolled,cold drawn,ERW ductile ... : TIANJIN China (Mainland)Brand Name: ZHCXModel Number: 200 300 400 600Type: SeamlessSteel Grade: 300 SeriesApplication: medichine,food, machine,industry, ... required7.Surface: pickled or sand blasting8.Steel Grade:200&300&400 series9.Packing: *seaworthy package *with plastic cap to ...