... ,China 3)Material:304,304L,316,316L 4)Technic:Polished Super SS Welded pipeSteel GradeTP304 /304L /316 /316L /316Ti /317/317L ... required.Test Eddying test,Ultrasouic test,intergranular corrosion,hardness test,impact test ,flattening testCertificate ISO 9001:2008Friendly remarkSpecial design is available ...