Type 201 (UNS S20100)


Type 201 is an austenitic chromium-nickel-manganese stainless steel that was developed in the 1950’s due to worldwide nickel shortages. In the Type 201 composition, manganese and nitrogen are partially substituted for nickel. T201 addresses the volatility of nickel prices while offering comparable corrosion resistance and formability to T301 and T304 and has become a viable lower cost alternative to these austenitic grades. Type 201 can be used in many applications because of its wide range of mechanical properties in the annealed and cold worked condition. Type 201 is non-magnetic in the annealed condition but becomes magnetic as a result of cold working.

Chemical Composition
Chemical Composition (wt%) limits as specified in ASTM A240 and ASME SA240*

Element 201
Carbon 0.15
Chromium 16.0-18.0
Nickel 3.5-5.5
Manganese 5.50-7.50
Silicon 1.00
Nitrogen 0.25
Phosphorus 0.060
Sulfur 0.030
* Maximum, unless range is indicated

Mechanical Properties
Mechanical property requirements for annealed product as specified in ASTM A240 and ASME SA240

Property 201
Yield Strength, min. (ksi) 45
Tensile Strength, min. (ksi) 95
Elongation, min. (%) 40
Hardness, max. (Rb) 100

Mechanical property requirements for cold worked flat rolled products as specified in ASTM A666

Condition Yield Strength
(ksi) min.
Tensile Strength
(ksi) min.
Elongation % min. in 2 in.
<0.015 in. ≥0.015 in.
¼ Hard 75 125 25 25
½ Hard 110 150 15 18
¾ Hard 135 175 10 12
Full Hard 140 185 8 9

Physical Properties
Physical properties for Type 201 stainless steel

Property 201
Density, lb/in3 0.283
Modulus of Elasticity, psi 28.6 x 106
Coefficient of Thermal Expansion, 68-212˚F, /˚F 9.2 x 10-6
Thermal Conductivity, Btu/ft hr ˚F 9.4
Specific Heat, Btu/lb ˚F 0.12
Electrical Resistivity, Microohm-in 27.0

Typical standards for Type 201 stainless steel


Data are typical, are provided for informational purposes, and should not be construed as maximum or minimum values for specification or for final design, or for a particular use or application. The data may be revised anytime without notice. We make no representation or warranty as to its accuracy and assume no duty to update. Actual data on any particular product or material may vary from those shown herein.  


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