Stainless Steel 310 (UNS S31000) Series stainless steels have excellent high temperature properties, ductility and weldability similar to other austenitic stainless steels and maintain good toughness even Low Temperature 310H (UNS S31009) is a low carbon version 310 for high temperature applications.

Stainless Steel 310S (  UNS S31008  ) is used when the temperature is lower than the normal temperature called 310L with a maximum carbon content of 0.03% is commonly used in corrosive environments such as urea production.

standard

ASTM A240 / A240M (310S and 310H) and ASTM A 167 (310) specify the properties of steel plates.  stainless  Rolled sheet and coil  310  Similar traits have been identified. But it doesn't have to be the same for other products such as tubes and rods with specific specifications.

corrosion resistance

The high chromium content is designed to improve performance at high temperatures and also allows these materials to have good corrosion resistance in aqueous solutions. Like 316 stainless steel, PRE is about 25 and seawater corrosion resistance is about 22°C, they exhibit excellent oxidation and carburizing resistance at high temperatures and It is resistant to fuming nitric acid at room temperature. The carbon content of all grades except 310L makes them susceptible to allergic and intercrystalline corrosion after exposure to high temperatures or welding. Stress corrosion resistance 310 is better than 304 or 316 stainless steel.

heat resistant performance

310H has good oxidation resistance, thermal fatigue resistance and circular heating performance. The working temperature of 310H is usually above 800 or 900℃, which can be used intermittently in the environment up to 1040 °C and continuously at 1150°C, which is higher than the effective working temperature of 304H. and 321 are used in high temperature sulfur dioxide gas applications. Due to carbide precipitation, continuous use in the 425-860°C temperature range is not recommended if resistance of the material to aqueous solution corrosion is required. But it generally performs well and below this temperature range. Sigma embrittlement Easily formed at 650-900℃

heat treatment

These materials cannot be hardened by heat treatment. Solid treatment (annealed) is heated to 1040-1150°C and cooled rapidly for maximum corrosion resistance. Due to prolonged precipitation of sigma brittle, it is recommended to restore toughness by solid solution treatment every 1000 hours after application at temperatures above 650 °C.

Weldabilty

good welding performance It is almost suitable for various standard welding methods. 310S stainless steel electrodes are recommended for fusion welding.

Applications 

310H and 310S are mainly used for steel plates and steel tubes for boiler, oil furnace, carburizing box, heat treatment basket and heat exchanger installation, filler welding wire and electrophoresis, etc.