ASTM B668 28 Stainless Steel Seamless Pipe SMLS 10'' SCH20

ASTM B668 28 Stainless Steel Seamless Pipe SMLS 10'' SCH20

Alloy 28 is a nickel-iron-chromium austenitic alloy that was developed for maximum resistance to acid attack, specifically sulfuric acid. Thissuperalloy has excellent resistance to general corrosion, pitting, and crevice corrosion in chemicals containing chlorides and sulfuric, phosphoric, and nitric acids. It also contains niobium for stabilization against sensitization and resultant intergranular corrosion.
28 combines excellent corrosion resistance with elevated mechanical properties and relatively easy fabrication. Although originally designed for use in sulfuric acid related industries, 28 is now a popular choice for a wide variety of industries including the chemical, food, pharmaceutical, and plastics industries. In addition, this superalloy is used in heat exchangers, mixing tanks, metal cleaning and pickling equipment, and piping.

There has long been a debate on whether 28 is a stainless steel or a nickel alloy because the nickel content is right on the border of defining it as one way or the other. So, depending on who you talk to this alloy may be referred to as 28 Stainless Steel or as a nickel alloy. Either way it is still great for corrosion resistance.

What are the characteristics of Incoloy 28 ?

• Excellent general corrosion resistance to sulfuric acid
• Excellent resistance to chloride stress corrosion cracking
• Excellent mechanical properties and fabricability
• Minimal carbide precipitation during welding
• Excels in resisting corrosion to hot sulfuric acids

Chemical Composition, %

In what applications is Incoloy 28 used?

• Synthetic rubber manufacturing equipment
• Processing of pharmaceuticals, plastics and organic and heavy chemicals
• Tanks, piping, heat exchangers, pumps, valves, and other process equipment
• Acid cleaning and pickling equipment
• Chemical process piping, reactor vessels
• Bubble caps
• Petrochemical process equipment
• Food and dye production

ASTM Specifications

Mechanical Properties
Annealed Material

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