AISI TYPE |
CHARACTERISTICS |
TYPICAL APPLICATIONS |
AUSTENTIC |
304 |
General purpose stainless steel specially for welded construction |
For welded construction or wall vessels formed in a number of draws. |
321 environ- |
Stabilized 18/8 type with titanium;
Not sensitive to intergranular corrosion within the carbide precipitation range of 420 to 870o C, corrosion resistance comparable to 304. |
Used in Oxidising corrosive
ments, within 420 to 870o for welded construction. No annealing required after welding. |
316 |
High creep strength, superior corrosion resisting properties in reducing atmosphere. |
Used in industries in such medias as Sulphurous acid, Sulphuric acid, Phosphoric acid, formic acids & various organic acids for better corrosion resistance than 18/8 type. |
310 |
Excellent high temperature properties with good ductility & weldability. |
Used up to 1150 o C for continuous service & 1050 for intermittent service in oxidising atmosphere. |
FERRITIC |
430 |
Good Combination of corrosion resistance, useful mechanical properties & good formability. Not hardenable by heat treatment. |
Utensils, hardwares, fasteners, appliances, furnace parts, Nitric acid processing equipments etc. |
MARTENSETIC |
410 |
General purpose corrosion & heat resisting steel; gives maximum corrosion resistance after heat treatment. Hardenable by heat treatment. |
Cutlery, shafts, cracking tower, bubbler caps & trays for oil & gas industry, beater bars for paper & pulp industries etc. |
* Austenitic stainless steels are not hardenable by heat treatment. These can be hardened by cold work only. |