Stainless Steel Pipe and Tube

Stainless steel pipe is a kind of hollow and longitude steel, the economic steel section is round. Stainless steel pipes and tubes have been widely used in the oil, chemical industry, medical, food, light industry, equipment, apparatus structural parts, etc. In addition, when twisting and anti-twist intensity are equal, stainless steel is lighter, so it is used in equipment parts and projects structural. Also used to produce all kinds of conventional weapons, barrels, shells, and so on.

These kinds of pipes divide into stainless steel seamless pipes and stainless welded pipes.

By manufacturing process can divided into the following basic types: hot-rolled, extrusion, cold-circular, hexagonal, equilateral triangle, octagonal, and other special-shaped stainless steel pipe.

Karisma offers super austenitic stainless steel pipe and tube in different material standards and grades.

• ASTM A312
• ASTM A213
• ASTM A269
• ASTM A789/ASME SA789
• ASTM A790/ASME SA790
• ASME SB677

ASTM A312 - For high temperature and general corrosive

The ASTM A312 standard specification for seamless, welded, and heavy cold-worked austenitic stainless steel pipes. stainless steel pipes and tubes are widely in sulfuric acid storage tanks in the phosphate fertilizer industries. Fluorosilicic/acid reactor phosphoric acid plant; Chlorate Crystallizer in the production of fertilizer; Ventilation system in a 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.

ASTM A213 stainless tubing for boiler, heat exchanger

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

ASTM A269 - General use stainless tubing

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

ASME SB677 - Extremely corrosive resistance

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

ASTM A789 - Duplex stainless tubing

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

ASTM A790 - Good resistance to stress corrosion cracking

ASTM A790/ ASME SA790 is the 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 is 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 test, and nondestructive test shall be performed to the specified requirements.

Karisma supply range for the stainless steel pipe and tube:

• Standards: ASTM A321, ASTM A213, ASTM A269, ASME SB677.
• Duplex stainless steel pipe standards: ASTM A789/ ASME SA 789. ASTM A790/ ASME SA 790.
• Material: AISI 304, 304L, 316, 316L.
• Outer Diameter: 5.8 - 508mm.
• Wall Thickness: 0.3 - 50mm.

• 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.
• 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.
• Longitudinal welding (Straight seam welding) processes: Including ERW, EFW.

Corrosion resistance performance is the key feature of stainless tubes. The commonly used types of steel involve ferritic and martensitic steel, which are predominantly made by adding chromium and manufactured through heat treatment or to be annealed. There are austenitic stainless steel tubing products that are rich in chromium and nickel and they offer better resistance levels when used under the same conditions as compared to martensitic or ferritic materials.

As Stainless steel tubing is applied in different industries and applications, so what are the common types of Stainless tubing pipe? Here are below:

• Stainless steel tubing in high-pressure use.
• Sanitary tubing.
• Mechanical use.
• Stainless steel tubing for structural and construction.
• Boiler stainless steel tube, heat exchanger.
• Aircraft tubing.
• Oil and gas industries, Petroleum cracking process, Casing and tubing.
• For pipelines, liquid transmission.

Generally manufactured using solid chromium or a combination of nickel and chromium, including manufactured in seamless and welded stainless pipe. Such as electric fusion welded pipe (ERW) that finds application in high-pressure usage, and large-diameter stainless steel pipe (welded and seamless) in case of corrosion of high-temperature applications.

Sanitary tubing is usually in stainless material and the referred standard is ASTM A270. In case the pipe or tube comes in direct contact with sensitive products like food, water, or drink, it is what we call a sanitary tube. In these situations, sanitary tubing has good performance of corrosive resistance, no tarnish, and is easy to clean.

Based on the usage, different levels of tolerance (diameters and thickness) shall be applied as in ASTM A270.