Related Tradenames:

2205 (tm) , AF.F51 , AL 2205 (tm) , Alloy 2205 , Cabvalloy alloy VS-22 (tm) , Marinox 22 (tm)

Chemistry Data :

Principal Design Features :

The balanced duplex structure of the alloy imparts good resistance to chloride stress corrosion cracking - a shortcoming of grades such as 304L and 316L. The chromium, molybdenum and nitrogen content of the alloy give it good pitting and crevice corrosion resistance and for many environments general corrosion resistance that is superior to 316L. This alloy resists chloride environments and sulfide stress corrosion. The high proof strength of ALLOY 2205 - approximately twice that of common austenitic stainless steels - provides for superior safety and economical design whilst the ductile to brittle transition temperature is at -55 deg C.

Applications :

Because of its corrosion properties the alloy is well suited for use in applications involving brackish water and for many processes in the chemical and petro-chemical industries. Most often employed in welded pipe and tube in chemical tanks, flue gas filters, acetic acid distillation components and heat exchangers.

Machinability :

Similar in nature to 316 stainless steel. Slow speeds, positive feeds, sharp tooling and rigid mounts are essential. Machinable with either high speed or carbide tooling, with speeds for carbide reduced by roughly 20 %.

Forming :

Due to its inherently high strength and work hardening rate, 2205 is difficult to form. It will take a lower radius than 316 stainless and a higher allowance must be made for springback.

Welding :

TIG, MIG, SMAW and manual covered electrode methods have been successfully employed. Use caution in the following areas : 1.) Do not preheat the weld piece. 2.) use low heat inputs and 3.) Cool below 300 F between passes.

Hot Working :

Hot work should be done in the range of 1750-2100 F, although room temperature forming is recommended whenever possible. When any hot forming is performed, a full anneal with rapid quench is required to reattain maximum stability and properties.

Annealing :

Anneal at 1868-1958 F(1020-1070 C), water quench.

Mechanical Data :