What are Different Grades of Stainless Steel Pipe?
Stainless steel is most widely used material for the fabrication of industrial products due to its excellent durability, versatility and cost effectiveness. Stainless steel pipe is available in diverse varieties such as seamless, welded, ERW, EFW, cold drawn etc. that are available in different standards and specifications. Due to the chromium and nickel content, stainless steel offers exceptional resistivity and strength even in hostile conditions. Stainless Steel Pipes are available in different grades that established by different standards such as SAE, ASTM, BS, EN, ASME and other standards. Stainless Steel Pipe is available in different families and their respective grades that are differentiated according to chemical composition:
Austenitic Stainless Steel Pipe: Stainless steel pipe is available in different austenitic grades including 303, 304, 310, 316 and 321 that vary in chemical composition and properties. These grades are most common grades that has higher amount of nickel, molybdenum and chromium content. These versatile grades offer exceptional malleability, tensile strength and anti-corrosiveness features. These austenitic grades of Stainless steel pipe offer exceptional creep resistance and resistance to pitting, and crevice corrosion. These stainless steel grades, 304, 316, 321 are further classified according to the carbon content. Stainless Steel Pipe offer exceptional toughness at elevated as well as cryogenic temperatures.
Ferritic Stainless Steel Pipe: This grade pipe is one of the most economical due to its less nickel content. Ferritic grades contain molybdenum, chromium, titanium, niobium and other elements that offer excellent creep resistance and toughness even in aggressive environments. Most of these Stainless Steel Pipe grades are magnetic and offer excellent weldablity. Ferritic grades of Stainless steel pipe include 430 and 410 grades that offer remarkable resistance to corrosion, oxidation and stress corrosion cracking.
Duplex Stainless Steel Pipe: These pipes have combines properties of austenitic and ferritic grades that make it stronger and one of the most widely used grades. Duplex Stainless Steel Pipe is lightweight and resistant to corrosion. Due to this feature, this pipe is suitable for marine applications. Stainless steel Pipe offer excellent tensile strength, and easy formability features. Duplex stainless steel grades include 2304, 255, 2205, and super duplex 2507 etc.
Martensitic & Precipitation Hardening Stainless Steel Pipe: This pipe is similar to ferritic but has elevated carbon content. Stainless steel pipe with martensitic grade are used in applications that require hardened edge. Due to excellent hardening and tempering features this grade is used in medical instruments. Stainless steel Pipe is available in grades like 410 and 420.