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Properties of Grade 310/310S Stainless Steel
These grades contain 25% chromium and 20% nickel, making them highly resistant to oxidation and corrosion. Grade 310S is a lower carbon version, less prone to embrittlement and sensitisation in service. The high chromium and medium nickel content make these steels capable for applications in reducing sulphur atmospheres containing H2S. They are widely used in moderately carburising atmospheres, as encountered in petrochemical environments. For more severe carburising atmospheres other heat resisting alloys should be selected. Grade 310 is not recommended for frequent liquid quenching as it suffers from thermal shock. The grade is often used in cryogenic applications, due to its toughness and low magnetic permeability.
In common with other austenitic stainless steels, these grades cannot be hardened by heat treatment. They can be hardened by cold work, but this is rarely practiced.
Chemcial Composition of Grade 310/310S Stainless Steel
The chemical composition of grade 310 and grade 310S stainless steel are summarised in the following table.
Chemical Composition | 310 | 310S |
Carbon | 0.25 max | 0.08 max |
Manganese | 2.00 max | 2.00 max |
Silicon | 1.50 max | 1.50 max |
Phosphorus | 0.045 max | 0.045 max |
Sulphur | 0.030 max | 0.030 max |
Chromium | 24.00 - 26.00 | 24.00 - 26.00 |
Nickel | 19.00 - 22.00 | 19.00 - 22.00 |
Mechanical Properties of Grade 310/310S Stainless Steel
he mechanical properties of grade 310 and grade 310S stainless steel are summarised in the following table.
Mechanical Properties | 310/ 310S |
Grade 0.2 % Proof Stress MPa (min) | 205 |
Tensile Strength MPa (min) | 520 |
Elongation % (min) | 40 |
Hardness (HV) (max) | 225 |
Physical Properties of Ferritic Stainless Steel
Properties | at | Value | Unit |
Density | 8,000 | Kg/m3 | |
Electrical Conductivity | 25°C | 1.25 | %IACS |
Electrical Resistivity | 25°C | 0.78 | Micro ohm.m |
Modulus of Elasticity | 20°C | 200 | GPa |
Shear Modulus | 20°C | 77 | GPa |
Poisson's Ratio | 20°C | 0.30 | |
Melting Rnage | 1400-1450 | °C | |
Specific Heat | 500 | J/kg.°C | |
Relative Magnetic Permeability | 1.02 | ||
Thermal Conductivity | 100°C | 14.2 | W/m.°C |
Coefficient of Expansion | 0-100°C | 15.9 | /°C |
0-315°C | 16.2 | /°C | |
0-540°C | 17.0 | /°C |
Fabrication of Grade 310/310S Stainless Steel
Fabrication Grades 310/310S are forged in the temperature range 975 - 1175°C. Heavy work is carried out down to 1050°Cand a light finish is applied to the bottom of the range. After forging annealing is recommended to relieve all stresses from the forging process. The alloys can be readily cold formed by standard methods and equipment.
Machinability of Grade 310/310S Stainless Steel
Machinability Grades 310/310SS are similar in machinability to type 304. Work hardening can be a problem and it is normal to remove the work hardened layer by using slow speeds and heavy cuts, with sharp tools and good lubrication. Powerful machines and heavy, rigid tools are used.
Welding of Grade 310/310S Stainless Steel
Welding Grades 310/310S are welded with matching electrodes and filler metals. The alloys are readily welded by SMAW (manual), GMAW (MIG), GTAW (TIG) and SAW. Electrodes to AWS A5.4 E310-XX and A 5.22 E310T-X, and filler metal AWS A5.9 ER310 are used. Argon is shielding gas. Preheat and post heat are not required, but for corrosion service in liquids full post weld solution annealing treatment is essential. Pickling and passivation of the surface to remove high temperature oxides are essential to restore full aqueous corrosion resistance after welding. This treatment is not required for high temperature service, but welding slag should be thoroughly removed.
Heat Treatment of Grade 310/310S Stainless Steel
Heat Treatment Type 310/310S are solution annealed by heating to temperature range 1040 -1065°C, holding at temperature until thoroughly soaked, then water quenching.
Heat Resistance of Grade 310/310S Stainless Steel
Grades 310/310S have good resistance to oxidation in intermittent service in air up to 1035°Cand 1050°Cin continuous service. The grades are resistant to oxidation, sulphidation and carburisation.
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Applications of Grade 310/310S Stainless Steel
Typical Applications Grade 310/310S is used in fluidised bed combustors, kilns, radiant tubes, tube hangers for petroleum refining and steam boilers, coal gasifier internal components, lead pots, thermowells, refractory anchor bolts, burners and combustion chambers, retorts, muffles, annealing covers, saggers, food processing equipment, cryogenic structures.
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