... .5-60mm Brand:Tigersteel Certificate:ISO,API ERW Pipe/ ERW Tube Professional Manufacturer 1)Standard:GB, DIN, JIS, ASTM2)Grade:10#,20 ... . Low and middle pressure fluid transportation pipe lines b.Casing tube c.Boiler pipes d.Conveyance of electricity ERW API Line ... low pressure liquid delivery and other purposes. ERW Pipe/ ERW Tube Professional Manufacturer