309Triton Alloys Inc keep Stocks in 309/309S which is a highly authenticate CR-NI stainless steel used for its excellent oxidation resistance, High temperature and creep resistance.  SS 309 except for a Low Carbon Content that minimizes carbide precipitation and improves weld ability.It is tough and ductile,and can be readily fabricated and machined

309S is the low-carbon version of 309,and is recommended for applications where sensitisation, and subsequent corrosion by high temperature gases or condensates during shutdown may pose a problem. They are essential Non-Magnetic  as annealed  & become slightly magnetic when  cold worked. 309 is manufactured to ASTM A 167 and  309S to ASTM A240 specifications.

Specifications

  • AMS 5523
  • ASME SA 240, ASME SA 312, ASME SA 479
  • ASTM A 240, ASTM A 276, ASTM A 276 Condition A, ASTM A 276 Condition S, ASTM A 312, ASTM A 479
  • EN 1.4833
  • UNS S30908, UNS S30909
  • Werkstoff 1.4833


Chemical Properties

Element
Content (%)
Iron, Fe
60
Chromium, Cr
23
Nickel, Ni
14
Manganese, Mn
2
Silicon, Si
1
Carbon, C
0.20
Phosphorous, P
0.045
Sulfur, S
0.030

 

Physical Properties

Properties
Metric
Imperial
Density
8 g/cm3
0.289 lb/in³
Melting point
1455°C
2650°F

 

Mechanical Properties

Properties Metric Imperial
Tensile strength
620 MPa
89900 psi
Yield strength (@ strain 0.200%)
310 MPa
45000 psi
Izod impact
120 – 165 J
88.5 – 122 ft-lb
Shear modulus (typical for steel)
77 GPa
11200 ksi
Elastic modulus
200 GPa
29008 ksi
Poisson’s ratio
0.27-0.30
0.27-0.30
Elongation at break (in 50 mm)
45%
45%
Hardness, Brinell
147
147
Hardness, Rockwell B
85
85
Hardness, Vickers (converted from Rockwell B hardness)
169
169

 

Thermal Properties

Properties Metric Imperial
Thermal expansion co-efficient (@ 0-100°C/32-212°F)
14.9 µm/m°C
8.28 µin/in°F
Thermal conductivity (@ 0-100°C/32-212°F)
15.6 W/mK
108 BTU in/hr.ft².°F

 

Common Applications of 309 Stainless Steel

  • Furnace parts
  • Muffles, Retorts
  • Firebox sheets
  • High temperature containers
  • Catalytic converters
  • Exhaust systems
  • Radiant Tubes
  • Fluidized bed coal combusters
  • Petroleum refineries and steam boilers
  • Thermowells
  • Carbon Saggers
  • Paper Mill Equipment
  • Power boiler tube hangers
  • Anchor bolts
  • Gladd forming equipment
  • Food processing industry

Fabrication and Heat Treatment

Machinability

Grade 309 stainless steel can be machined similar to that of 304 stainless steel.


Welding

Grade 309 stainless steel can be welded using fusion or resistance welding methods. Oxyacetylene welding method is not preferred for welding this alloy.

Hot Working

Grade 309 stainless steel is hot worked at 1177°C (2150°F) followed by reheating at 982°C (1800°F). It can be then quenched rapidly. Post-work annealing can be done to restore its corrosion resistance property.

Cold Working

Grade 309 stainless steel can be headed, upset, drawn, and stamped even though it has high work hardening rate. Annealing is performed after cold working in order to reduce internal stress.

Annealing

Grade 309 stainless steel is annealed at 1038-1121°C (1900-2050°F) followed by quenching in water.

Hardening

Grade 309 stainless steel does not react to heat treatment. Strength and hardness of this alloy can be increased by cold working.

To find out more about Triton Alloys Inc Services and our Range of “ Grade 309 & 309S Stainless Steel” which we can supply directly to you, Click Here to Contact Us.