Grade 310 is a medium carbon austenitic stainless steel, for high temperature applications such as furnace parts and heat treatment equipment. It is used at temperatures up to 1150°C in continuous service, and 1035°C in intermittent service. Grade 310S is a low carbon version of grade 310.
Applications of Grade 310/310S Stainless Steel
310S stainless steel coiled tubing
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.
Properties of Grade 310/310S Stainless Steel
310S stainless steel coiled tubing
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
310S stainless steel coiled tubing
The chemical composition of grade 310 and grade 310S stainless steel are summarised in the following table.
Table 1. Chemical composition % of grade 310 and 310S stainless steel
310S stainless steel coiled tubing
|
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
The mechanical properties of grade 310 and grade 310S stainless steel are summarised in the following table.
Table 2. Mechanical properties of of grade 310/310S stainless steel
|
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
The physical properties of grade 310 and grade 310S stainless steel are summarised in the following table.
Table 3. Physical properties of grade 310/310S 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 |
Post time: Jun-07-2023