Type 201 Stainless Steelis an austenitic chromium-nickel-manganese stainless steel which was developed to conserve nickel. Type 201 is a lower cost alternative to conventional Cr-Ni stainless steels such as 301 and 304. Nickel is replaced by additions of manganese and nitrogen. It is non-hardenable by thermal treatment, but may be cold worked to high tensile strengths. Type 201 is essentially nonmagnetic in the annealed condition and becomes magnetic when cold worked. Type 201 can be substituted for Type 301 in many applications.
Specifications
ASTM A240, A666
Typical Applications
Typical applications for Types 201 are cookware, hose clamps, piston rings, transit car structural member, transit car roofing/siding, thermal window spacers, air bag containers, and truck trailer posts and door frames.
Chemical Composition
Element |
Type 201 |
Carbon |
0.15x |
Manganese |
5.5 - 7.5 |
Sulfur |
0.03X |
Phosphorus |
0.060x |
Silicon |
1.0 x |
Chromium |
16 - 18 |
Nickel |
0.6-5.5 |
Nitrogen |
0.25x |
Mechanical Properties
Type |
Yield Strength 0.2% offset (KSI) |
Tensile Strength (KSI) |
% Elongation(2" Gauge length) |
Hardness Rockwell |
201 Ann |
38 min. |
75 min. |
40% min. |
HRB 95 max. |
201 Hard |
75 min. |
125 min. |
25.0 min. |
25 32 HRC (typical) |
201 Hard |
110 min. |
150 min. |
18.0 min. |
32 - 37 HRC (typical) |
201 Hard |
135 min. |
175 min. |
12.0 min. |
37 41 HRC (typical) |
201 Full Hard |
145 min. |
185 min. |
9.0 min. |
41 46 HRC (typical) |
Physical Properties
Density (lb./ in^2) @ RT |
0.283 |
|
Modulus of Elasticity in Tension (psi x 10^6) |
28.6 |
|
Specific Heat (BTU/°F/lb.) |
32 to 212 °F |
0.12 |
Thermal Conductivity (BTU/hr/ft^2/ft) |
212°F |
9.4 |
Mean Coefficient of Thermal Expansion (in. x 10^-6 per °F) |
32 to 212°F |
8.7 |
32 to 600°F |
9.7 |
|
32 to 1,000°F |
10.2 |
|
Electrical Resistivity (micro ohms - cm) |