Stainless steel 310
STAINLESS STEEL 310 GENERAL PROPERTIES: The Chromium-Nickel alloy has a density of 0.290 lb/in3. Its modulus of elasticity of 29.0 x 106 psi. The specific heat capacity of Grade 310 is 0.12 Btu/lb ˚F.
Under intermittent service, Grade 310 shows excellent resistance to oxidation up to 1035°. In continuous service, it shows resistance to oxidation up to 1050°C.
It is also resistant to sulfidation and carburisation. The electrical resistivity is 30.7 microohm-in. It is non-magnetic, both in the non-annealed and annealed conditions. The chances of loss of Oo ductility are very less, and the alloy remains durable and sturdy.
CHEMICAL COMPOSITION: The type stainless steel 310 consists of 24-26% Chromium, 19-22% Nickel, 2.00% Manganese, 1.50% Silicon, 0.045% Phosphorus, 0.030% Sulfur and 0.25% Carbon. The high chromium enables reduced sulfur atmospheres containing Hydrogen Sulphide. The combined effect of Chromium and Nickel enable high resistance to oxidation.
CORROSION RESISTANCE: The Chromium and nickel content give Grade 310 high resistance to corrosion. However, the resistance is not applicable for corrosive liquid service. At temperatures, 550 – 800°C, the alloy will be, sensitised to intergranular corrosion caused by the segregation of impurities at the boundaries.
Liquids containing chlorides at extreme temperatures more than 100°C can be corrosive for the alloy. Thus, it can cause corrosion cracking. The alloy does not consist of the constituent molybdenum. It leads to a lack of pitting resistance.
WELDING: The welding of type stainless steel 310 can be done, with matching electrodes like AWS A5.4 E310-XX and A 5.22 E310T-X and filler metal like AWS A5.9 ER310. There is no heat required before and after the welding process.
However, there is a possibility of the formation of high-temperature oxides on the surface after welding. For this, pickling and dormant passivation of the surface can be done. After welding, annealing should be done to restore any loss of corrosive resistance.
FABRICATION AND HEAT TREATMENT: The standard methods can readily form the alloys.
HOT WORKING: The hot forging for grade 310 is carried out in the temperature range 975 – 1175°C.
COLD WORKING: Grade stainless steel 310 can go through cold working by stamping, drawing, upsetting etc.
ANNEALING: The Annealing is done by heating to the temperature range 1040 -1065°C. The alloy is then held, at that temperature for some time. This step ensures that the toughness of the material is retained.
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