321 Stainless Steel Supply

Introduction

321 Stainless Steel is an austenitic chromium-nickel stainless steel containing Titanium which is recommended for parts fabricated by welding which cannot subsequently be annealed. 321 Stainless Steel is a stabilized austenitic stainless steel similar to ss 304 but with a titanium addition. This titanium addition reduces or prevents carbide precipitation during welding and in 800 - 1500 °F (427 - 816 °C) service. It also improves the elevated temperature properties of the alloy. 321 Stainless Steel provides excellent resistance to oxidation and corrosion and possesses good creep strength.

Type 321 Stainless Steel Properties

Corrosion Resistance: Type 321 stainless steel has excellent corrosion resistance in a wide range of environments. It can withstand exposure to water, chemicals, and other corrosive substances without corroding or rusting.

Strength: Type 321 stainless steel has high tensile strength and can withstand heavy loads without bending or breaking. It has a minimum tensile strength of 515 MPa and a minimum yield strength of 205 MPa.

Ductility: Type 321 stainless steel has good ductility, which means that it can be easily formed and shaped without cracking or breaking. This property makes it ideal for applications that require complex shapes or designs.

Weldability: Type 321 stainless steel is easily weldable, making it an excellent choice for applications that require welding. It can be welded using common welding techniques, such as TIG, MIG, and resistance welding.

Magnetic Properties: Type 321 stainless steel is non-magnetic in the annealed condition and becomes slightly magnetic after cold working. This property makes it suitable for applications that require non-magnetic properties.

Heat Resistance: Type 321 stainless steel has excellent heat resistance and can withstand high temperatures without losing its strength or corrosion resistance. It can withstand temperatures up to 870°C (1600°F) without undergoing any significant change in its properties.

321 Steel Grade Worldwide Equivalents

GBJISASTMDIN EN/DINNF EN/NFENGOSTSSBS EN/BS
0Cr18Ni10TiSUS321321X10CrNiTi18-9Z6CNT18-10X6CrNiTi18-1008KH18N10T2337321S31
1Cr18Ni11TiX6CrNiTi18-1008KH18N12T
H0Cr20Ni10Ti 12KH18N10T

Chemical Composition of 321 Stainless Steel

Type 321 Stainless Steel Chemical Composition

UNSGradesCMnPSSiCrNiMoNCuEF
S32100321 (1Cr18Ni10Ti)0.0820.0450.030.7517.0-19.09.0-12.00.1Ti:5(C+N)min,

Physical Properties of 321 Stainless Steel

PropertyDensity, lb/in3Modulus of Elasticity, psiCoefficient of Thermal Expansion, 68-212˚F, /˚FThermal Conductivity, Btu/ft hr ˚FSpecific Heat, Btu/lb ˚FElectrical Resistivity, Microohm-in
321 Data0.28628.0 x 1069.2 x 10-69.30.1228.4

321 Stainless Steel Applications

321 stainless steel is a stabilized austenitic stainless steel alloy containing titanium. The addition of titanium provides stabilization against chromium carbide precipitation, which enhances its resistance to intergranular corrosion. Here are some common applications of 321 stainless steel:

  1. Aircraft Exhaust Systems: 321 stainless steel is often used in the manufacturing of aircraft exhaust systems due to its excellent high-temperature corrosion resistance and resistance to intergranular corrosion.
  2. Heat Exchangers: Components in heat exchangers, including tubes and plates, may be made from 321 stainless steel due to its resistance to corrosion in high-temperature environments.
  3. Chemical Processing Equipment: 321 stainless steel is employed in the chemical processing industry for equipment such as reactors, tanks, and piping systems where resistance to corrosive chemicals and high temperatures is essential.
  4. Expansion Joints: In industrial applications requiring flexibility and resistance to high temperatures, expansion joints made from 321 stainless steel may be used.
  5. Welded Equipment: The weldability of 321 stainless steel makes it suitable for welded equipment in various industries, including chemical processing and power generation.
  6. Jet Engine Parts: Certain components in jet engines, such as exhaust systems and ducting, may use 321 stainless steel due to its high-temperature corrosion resistance.
  7. Automotive Applications: 321 stainless steel can be used in automotive applications, such as exhaust systems and components requiring resistance to high-temperature environments.
  8. Heat Treatment Equipment: Components in heat treatment equipment, such as furnace parts and trays, may be made from 321 stainless steel due to its high-temperature stability.
  9. Petrochemical Industry: Equipment used in the petrochemical industry, including heat exchangers, valves, and piping systems, may use 321 stainless steel for its corrosion resistance.
  10. Food Processing Equipment: In certain food processing applications where corrosion resistance and cleanliness are crucial, 321 stainless steel may be used for equipment such as conveyors and processing vessels.

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