Properties of Type 201 Steel (aka T201, type 201 and grade 201)
An austenitic, non-magnetic, stainless steel 201 has the following composition.
It is Chromium (16% – 18%), and Nickel (3.5% – 5.5%). It contains higher amounts of Manganese (5.5%-7.5%) and Nitrogen, and lower amounts of Nickel than type 304 steel.
Increasing costs and the high volatility of Nickel have made Type 201 stainless steel increasingly attractive for certain stainless steel end products. In most applications, there is no loss in resistance to corrosion.
Qualities of type 201 stainless steel are:
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
Processing & Forming 201 Stainless Steel
At GNEE, we use type 201 stainless steel that has been formed and drawn. Type 201 has a high work-hardening rate that often requires intermediate annealing. It can be welded, however, by all standard methods used for higher (18%) Chromium and (8%) Nickel stainless steels.
We are careful not to use stainless steel where inter-granular corrosion has impacted the head zone due to a Carbon content exceeding 0.03%. Type 201 stainless steel cannot be hardened using thermal treatment. It can be cold worked, however, to high tensile strengths.
Also note that stainless steel 201 is essentially nonmagnetic in the annealed condition and becomes magnetic when cold worked.