309S Stainless steel round bar
Grade 309S Stainless Steel is used often for higher temperature applications. While its oxidation resistance surpasses that of alloy 310, its resistance to corrosion is equivalent to that of alloy 310
Description
Type 309S are austenitic chromium-nickel stainless steels that provide excellent corrosion resistance and heat resistance plus good strength at room and elevated temperatures. Type 309S Stainless Steel is identical to Type 309 except for a lower carbon content that minimizes carbide precipitation and improves weldability. They are essentially nonmagnetic as annealed and become lightly magnetic when cold worked.
Chemical Composition: (A167, A240)
Element | Type | Type |
Carbon | 0.20 max. | 0.08 max. |
Manganese | 2.00 max. | 2.00 max. |
Sulfur | 0.030 max. | 0.030 max. |
Phosphorus | 0.045 max. | 0.045 max. |
Silicon | 0.75 max. | 0.75 max. |
Chromium | 22.0 – 24.0 | 22.0 – 24.0 |
Nickel | 12.0 – 15.0 | 12.0 – 15.0 |
Mechanical Properties: (ASTM A167, A240)
Type | Yield Strength 0.2% offset (KSI) | Tensile Strength (KSI) | % Elongation (2" Gauge length) | Hardness Rockwell |
309 | 30 min. | 75 min. | 40 min. | HRB 95 max. |
309S | 30 min. | 75 min. | 40 min. | HRB 95 max. |
Physical Properties:
Density (lb./ in^2) @ RT |
| 0.29 |
Modulus of Elasticity in Tension (psi x 10^6) |
| 29.0 |
Specific Heat (BTU/o F/lb.) | 32 to 212 oF | 0.12 |
Thermal Conductivity (BTU/hr/ft^2/ft) | 212oF | 9.0 |
| 932oF | 10.8 |
Mean Coefficient of Thermal Expansion (in. x 10^-6 per o F) | 32 to 212oF | 8.3 |
| 32 to 600oF | 9.3 |
| 32 to 1,000oF | 9.6 |
| 32 to 1,200oF | 10.0 |
Electrical Resistivity (micro ohms - cm) | at 70oF | 39.8 |
Melting Point Range (oF) |
| 2550 - 2650 |
Oxidation Resistance - Continuous Service(oF) |
| 2000 |
Oxidation Resistance - Intermittent Service(oF) |
| 1800 |
Preponderance
Types 309S provide excellent general corrosion resistance. They are more resistant to marine atmospheres than Type 304. They exhibit high resistance to sulfite liquors and are useful for handling nitric acid, nitric-sulfuric acid mixtures, and acetic, citric, and lactic acids.
Application
Furnaces — burners, doors, fans, piping and recuperators
Fluidized Bed Furnaces — grids, piping, wind boxes
Paper Mill Equipment
Petroleum Refining — catalytic recovery systems, recuperators
Power Generation — pulverized coal burners, tube hangers
Thermal Processing — annealing covers and boxes, burners grids, doors, fans, lead pans and neutral salt pots, muffles and retorts, recuperators, walking beams
