Type 201 Stainless Steel - Properties and Composition

201 stainless steel
Stainless Steel Sink. Nickel Institute

Type 201 is part of the 200 series of austenitic stainless steels. Originally developed to conserve nickel, this family of stainless steels is characterized by low-nickel content.

Type 201 can substitute for type 301 in many applications, but is less corrosion resistant than its counterpart, particularly in chemical environments.

Annealed, it is non-magnetic, but can become magnetic by cold working.

A greater nitrogen content in type 201 provides higher yield strength and toughness than type 301 steel, especially at low temperatures.

Type 201 is not hardened by heat treatment and is annealed at 1850-1950°F (1010-1066°C), followed by water quenching or rapid air cooling.

Type 201 is used to produce a range of household appliances, including sinks, cooking utensils, washing machines, windows and doors. It is also used in automotive trim, decorative architecture, railway cars, trailers and clamps. It is not recommended for structural outdoor applications because of its susceptibility to pitting and crevice corrosion.

Type 201 Stainless Steel Composition

ElementType 201 (Wt.%)
Carbon0.15 max.
Manganese5.50-7.50 max.
Phosphorus0.06 max.
Sulfur0.03 max.
Silicon1.00 max.
Chromium16.00-18.00
Nickel3.50-5.50
Nitrogen0.25 max.
IronBalance

Source: AK Steel Product Data Sheet. 201 Stainless Steel

Processing and Forming:

Type 201 stainless cannot be hardened by heat treatment, but can by cold working.

Type 201 can be annealed at temperatures between 1010 and 1093°C (1850 and 2000°F). In order to keep carbides in solution and avoid sensitization, rapid cooling through the carbide precipitation range 815 and 426°C (1500 and 800°F) is required. 

This grade of stainless can be both formed and drawn. Intermediate annealing may be required for severe operations as a result of type 201's high work-hardening rate.

 

Welding:

Type 201 stainless can be welded by all standard methods used for 18 percent chromium and 8 percent nickel stainless steels, however, inter-granular corrosion can impact the heat zone if carbon content exceeds 0.03 percent. 

Physical Properties:

Density (lb./ in2) @ RT:  0.283
Modulus of Elasticity in Tension (psi x 106):  28.6
Specific Heat (BTU/° F/lb.): 32 to 212°F   0.12
Thermal Conductivity (BTU/hr/ft2/ft): 212°F  9.4
Melting Point Range (°F): 2550-2650°F

 

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