... 4)Length: 1m-12m Welded Stainless Steel TubeMaterial Grade 304,304L,316 ,316L,321,310S and so on.Standard ASTM A312, A554, A249, A269 ... , condenser pipe, heat exchanger, petroleum, shipping military, environment protection, high temperature resistant, low temperature resistant, corrosion resistant and so on. 304 welded stainless steel pipe