UNS S31803 / F51

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Stainless steels are high-alloy steels. These steels are available in four groups that include martensitic, austenitic, ferritic and precipitation-hardened steels. These groups are formed based on the crystalline structure of stainless steels. Stainless steels contain larger amounts of chromium in comparison with other steels and thus have good corrosion resistance. Most of the stainless steels contain about 10% of chromium. Grade 2205 stainless steel is a duplex stainless steel whose design enables combining improved resistance to pitting, high strength, stress corrosion, crevice corrosion and cracking. Grade 2205 stainless steel resists sulfide stress corrosion and chloride environments. The following datasheet provides an overview of grade 2205 stainless steel.

Grade 2205 stainless steel is annealed at 1020-1070°C (1868-1958°F) and then water quenched.

Grade 2205 stainless steel is hot worked in the temperature range of 954-1149°C (1750-2100°F). Hot working of this grade stainless steel under room temperature is recommended whenever possible.

Welding methods recommended for grade 2205 stainless steel include SMAW, MIG, TIG and manual covered electrode methods. During the welding process, the material should be cooled below 149°C (300°F) between passes and preheating of the weld piece should be avoided. Low heat inputs should be used for welding grade 2205 stainless steel.

Most standard welding methods suit this grade, except welding without filler metals, which results in excess ferrite. AS 1554.6 pre-qualifies welding for 2205 with 2209 rods or electrodes so that the deposited metal has the right balanced duplex structure.
Adding nitrogen to the shielding gas ensures that adequate austenite is added to the structure. The heat input must be maintained at a low level, and the use of pre or post heat must be avoided. The co-efficient of thermal expansion for this grade is low; hence the distortion and stresses are lesser than that in austenite grades.

Grade 2205 stainless steel can be machined with either carbide or high speed tooling. The speed is reduced by about 20% when carbide tooling is used.

Grade 2205 stainless steel is used in the following applications: Fuel Gas Filters, Chemical Tanks, Heat exchangers, Acetic acid distillation components


Chemical Composition

The chemical composition of grade 2205 stainless steel is outlined in the following table.

Mechanical Properties

The typical mechanical properties of grade 2205 stainless steels are listed in the table below. Grade S31803 has similar mechanical properties to that of S32205.

Physical Properties

The following table shows the physical properties of grade 2205 stainless steel.

Mechanical Properties

The mechanical properties of grade 2205 stainless steel are displayed in the following table.

Thermal Properties

The thermal properties of grade 2205 stainless steel are given in the following table

Other Designations

Equivalent materials to grade 2205 stainless steel are:
  • ASTM A182 Grade F51
  • ASTM A240
  • ASTM A789
  • ASTM A790
  • DIN 1.4462

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