What is the material and process of stainless steel snake tube? What production standards are generally implemented?

Material: 304, 304L, 321, 316, 316L, 310S, 347H, 2205, 2507, 904L, etc.

Process size: conventional diameter 19mm, 25mm, 32mm, 38mm spot, according to the requirements to do sizing, the longest can do 30m, according to the application of different, can use cold drawing (annealing, pickling for soft industrial tube) and cold rolling (uniform wall thickness, hard not annealing inside and outside bright, annealing into soft industrial tube) two kinds of process.

Production standards: GB3087-1999 "Seamless steel tubes for low and medium pressure boilers", GB5310-1995 "Seamless steel tubes for high pressure boilers", GB13296-2007 "Seamless stainless steel tubes for boilers and heat exchangers", ASME SA213 "seamless ferritic and austenitic alloy steel tubes for boilers, superheaters and heat exchangers".