ASTM A249/ASME SA249 is a standard specially for welded Austenitic steel boiler, superheater, heat-exchanger, and condenser tubes, covers nominal-wall-thickness welded tubes and heavily cold worked welded tubes.
ASTM A269/ASME SA 269 is a standard for seamless and welded Austenitic stainless steel tubing for general corrosion-resisting and low-or high-temperature service. These steel are susceptible to embitterment if used for prolonged periods at elevated temperatures.
ASTM A789 is a standard for seamless and welded Ferritic/Austenitic stainless steel tubing for services requiring general corrosion resistance, with particular emphasis on resistance to stress corrosion cracking. These steel are susceptible to embitterment if used for prolonged periods at elevated temperatures.
As a welded tube factory, MW supplies above standards in welded condition. Above standards are widely used for industrial pressure tubing and piping. And MW is certified with PED 2014/68/EU and AD2000, which is specialized certification for pressure tubing and piping.
Bright Annealing: Hydrogen bright annealed in line to 1900 ℉(1040℃) minimum and rapidly water quenched is processed for all grades.
Surface Condition: The tubes, after final heat treatment(Bright annealing), shall be chemically descaled or pickled free of scale. When bright annealing is used, pickling or chemical descaling is not necessary.
Packing:
Hexagon Bundle Package
Frame Package
Crate / Boxing Package
Tags must be secured to the bundles, frames and boxes.
