An reorder for ASTM-A480-SS309-Stainless-Steel-Plate from Irsael buyer.

Stainless steels are high-alloy steels which have higher corrosion resistance compared to other steels due to the presence of large amounts of chromium. Based on their crystalline structure, they are further divided into ferritic, austenitic, and martensitic steels.

Grade 309 stainless steel has high corrosion resistance and strength compared to 304 stainless steel.

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

SS309 Plate (1)SS309 Plate (2)
SS309 Plate (4)SS309 Plate (5)

SS309 Plate (3)

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.

Applications

Grade 309 stainless steel is used in the following applications:

  • Boiler baffles
  • Furnace components
  • Oven linings
  • Fire box sheets
  • Other high temperature containers.

The following datasheet gives an overview of grade 309 stainless steel.

The following table shows the chemical composition of grade 309 stainless steel.

Chemical Composition

ElementContent (%)
Iron, Fe60
Chromium, Cr23
Nickel, Ni14
Manganese, Mn2
Silicon, Si1
Carbon, C0.20
Phosphorous, P0.045
Sulfur, S0.030

Physical Properties

The physical properties of grade 309 stainless steel are given in the following table.

PropertiesMetricImperial
Density8 g/cm30.289 lb/in³
Melting point1455°C2650°F

Mechanical Properties

The following table outlines the mechanical properties of annealed grade 309 stainless steel.

PropertiesMetricImperial
Tensile strength620 MPa89900 psi
Yield strength (@ strain 0.200%)310 MPa45000 psi
Izod impact120 - 165 J88.5 - 122 ft-lb
Shear modulus (typical for steel)77 GPa11200 ksi
Elastic modulus200 GPa29008 ksi
Poisson's ratio0.27-0.300.27-0.30
Elongation at break (in 50 mm)45%45%
Hardness, Brinell147147
Hardness, Rockwell B8585
Hardness, Vickers (converted from Rockwell B hardness)169169

Thermal Properties

The thermal properties of grade 309 stainless steel are displayed in the following table.

PropertiesMetricImperial
Thermal expansion co-efficient (@ 0-100°C/32-212°F)14.9 µm/m°C8.28 µin/in°F
Thermal conductivity (@ 0-100°C/32-212°F)15.6 W/mK108 BTU in/hr.ft².°F

Other Designations

Other designations equivalent to grade 309 stainless steel are included in the following table.

ASTM A167ASME SA249ASTM A314ASTM A580
ASTM A249ASME SA312ASTM A358FED QQ-S-763
ASTM A276ASME SA358ASTM A403FED QQ-S-766
ASTM A473ASME SA403ASTM A409MIL-S-862
ASTM A479ASME SA409ASTM A511SAE J405 (30309)
DIN 1.4828ASTM A312ASTM A554SAE 30309