309s Stainless Steel

309s Stainless Steel

309 is a highly alloyed austenitic stainless steel used for its excellent oxidation resistance, high temperature strength and creep resistance. The lower nickel content of CS309 improves resistance to sulphur attack at high temperatures. It is tough and ductile, and can be readily fabricated and...

Product Details

309 is a highly alloyed austenitic stainless steel used for its excellent oxidation resistance, high temperature strength and creep resistance. The lower nickel content of CS309 improves resistance to sulphur attack at high temperatures. It is tough and ductile, and can be readily fabricated and machined. 309S is the low-carbon version of CS 309, and is recommended for applications where sensitisation, and subsequent corrosion by high temperature gases or condensates during shutdown may pose a problem.

CS 309 is manufactured to ASTM A 167 and CS 309S to ASTM A240 specifications.

Typical Applications

CS 309 / 309S is used exclusively for its high temperature oxidation resistance. It is common for CS 309, 310 and 321 to be used in the same piece of equipment in the various temperature regions.

Creep Properties

Typical Creep Properties

TemperatureCreep Strain (MPa)Creep Rapture (MPa)
°C°F1000 H10000 H100000 H1000 H10000 H100000 H
6001112120804019012065
7001292502520753616
80014722010835187.5
9001652843158.53
1000183242.51.5841.5

Chemical Analysis

Weight % (all values are maximum unless a range is otherwise indicated)

Element309309S309H
Chromium22.0 min.-24.0 max.22.0 min.-24.0 max.22.0 min.-24.0 max.
Nickel12.0 min.-15.0 max.12.0 min.-15.0 max.12.0 min.-15.0 max.
Carbon0.200.080.04 min.-0.10 max.
Manganese2.002.002.00
Phosphorus0.0450.0450.045
Sulfer0.0300.0300.030
Silicon0.750.750.75
IronBalanceBalanceBalance

Physical Properties

Density

0.285 lbs/in3

7.89 g/cm3

Specific Heat

0.12 BTU/lb-°F (32 – 212°F)

502 J/kg-°K (0 – 100°C)

Modulus of Elasticity

28.5 x 106 psi

193 GPa

 

Thermal Conductivity 212°F (100°C)

9.0 BTU/hr/ft2/ft/°F

15.6 W/m-°K

Melting Range

2500 – 2590°F

1480 – 1530°C

Electrical Resistivity

30.7 Microhm-in at 68°C

78 Microhm-cm at 20°C


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