SS 201

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

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Mechanical Properties

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

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

Physical Properties for type SS 201

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Standards SS 201

• ASTM A240
• ASTM A666
• ASME SA240

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.

Processing

The annealing temperature for Type 201 is between 1850-2000°F. Rapid cooling through the carbide precipitation range (1500 – 800 o F) is necessary to keep the carbides in solution and prevent sensitization. Type 201 is not hardenable by thermal treatment; it is only hardenable by cold working.

Forming

Type 201 has similar bending, forming and drawing characteristics to Type 301 stainless steel

Welding

Type 201 can be welded by all conventional methods applied to 18 percent chromium, and 8 percent nickel steels. The filler metal of the conventional chromium-nickel analyses can be used. Like other austenitic stainless steels where carbon is not controlled below 0.03%, Type 201 is susceptible to intergranular corrosion in the weld heat-affected zone.

Corrosion

Type 201 is resistant to a wide variety of mild to moderately corrosive environments. It has corrosion resistance approaching that of Types 301 and has been successfully substituted for 304 in many mild environments.

Mechanical Properties of Stainless Steel 201

The physical properties of grade 201 stainless steel are given in the following here.

Conclusion

Type 201 is an austenitic chromium-nickel-manganese stainless steel that was developed originally to conserve nickel. It provides properties similar to Type 301 and can be used in most applications for Type 301. This alloy is non-magnetic in the annealed condition but becomes slightly magnetic when cold worked. The rate of work hardening is similar to Type 301, although Type 201 develops somewhat higher yield strength while retaining equal ductility when cold worked. Toughness at low temperatures is excellent. 

Typical uses include appliances, restau- rant equipment, cooking utensils, sinks, automotive trim, architectural applications such as windows and doors, railway cars, trailers and hose clamps.