Seamless Super Duplex ASTM A789 A789M Duplex S32750UNS Stainless Steel Seamless Tube Pipe ASTM A213 ASTM A312 ASME SB677 ASTM A790

Process Method of stainless steel pipe

1. Seamless Hot Rolling Processes
Round Pipe Billet → Heating → Perforation → Three Roll Skew Rolling, Continuous Rolling or Extrusion → Off Pipe → Sizing (Or Reducing Diameter)→ Cooling → Billet → Straightening → Water Pressure Test ( Or Flaw Detection) → Marking → Storage
2. Seamless Cold Rolling (Cold drawn) Processes
Round Pipe Billet → Heating → Perforation → Head → Annealing → Pickling → Oil (Copper) → Multi Pass Drawing (Cold Rolling) → Billet → Heat Treatment → Straightening → Water Pressure Test → Marking → Storage
3. Longitudinal welding (Straight seam welding) processes
Including ERW, EFW.

Products Standard Specification

The ASTM A312 standard specification for seamless, welded, and heavy cold worked austenitic stainless steel pipes. stainless steel pipe and tube is widely in sulfuric acid storage tank in the phosphate fertilizer industries. Fluorosilicic /acid reactor phosphoric acid plant; Chlorate Crystallizer in the production of fertilizer; Ventilation system in pharmaceutical factory; Solvent recovery filter, condenser, pipeline; Bleaching equipment and filter in the pulp and paper industry; pipelines and water collecting system in offshore platforms; multi-stage flash distillation, low-temperature multi effect desalination; seawater condenser for power plant and so on.

The ASTM A213 covers the seamless ferric carbon steel and austenitic alloy stainless steel tube, applied for boiler, superheater, and heat-exchanger steel tubes.

The ASTM A269 covers the stainless steel tubes for common application in seamless and welded.

ASME SB677 specification covers the UNS N08904 (904L), UNS N08925, UNS N08926 (alloy 926), in seamless, of cold-drawn, and hot finished steel pipe and steel tube for the extremely corrosive services. The standard includes the material in carbon steel, and ferritic alloy steel, and austenitic stainless steel pipes and tube, 6% molybdenum alloy stainless seamless pipe and tube.

ASTM A789/ ASME SA789 covers seamless and welded ferritic/austenitic stainless steel tubing for general services. The standard also applied to duplex stainless steel tube material. All tubes in this standard shall be furnished with heat-treated condition according to specified temperature and quench conditions. When the final heat treatment is in a continuous furnace, or when heat treated condition is obitained directly by quenching after hot forming, the number of tubes of same size and from the same heat lot shall be determined from the prescribed sizes of the tubes.

ASTM A790/ ASME SA790 is standard specification for seamless and welded ferritic/austenitic stainless steel pipe. Including duplex stainless steel pipe material. The standard specification mainly covers seamless and longitudinal weld ferritic/austenitic steel pipe, that applied intended for general corrosive services, with particular emphasis on resistance to stress corrosion cracking. This kind of pipe shall be manufactured by seamless or automatic welding process, without adding filler metal in the welding processes. Heat analysis shall be made to determine the percentages of the chemical elements specified. Tensile test, hardening test, flattening test, hydrostatic tests and nondestructive test shall be performed to the specified requirements.