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. The following datasheet gives an overview of grade 309 stainless steel.
Alloy 309 (UNS S30900) is an austenitic stainless steel developed for use in high temperature corrosion resistance applications. The alloy resists oxidation up to 1900°F (1038°C) under non-cyclic conditions. Frequent thermal cycling reduces oxidation resistance to approximately 1850°F (1010°C).
Because of its high chromium and low nickel content, Alloy 309 can be utilized in sulfur containing atmospheres up to 1832°F (1000°C). The alloy is not recommended for use in highly carburizing atmospheres since it exhibits only moderate resistance to carbon absorption. Alloy 309 can be utilized in slightly oxidizing, nitriding, cementing and thermal cycling applications, albeit, the maximum service temperature must be reduced.
When heated between 1202 – 1742°F (650 – 950°C) the alloy is subject to sigma phase precipitation. A solution annealing treatment at 2012 – 2102°F (1100 – 1150°C) will restore a degree of toughness.
309S (UNS S30908) is the low carbon version of the alloy. It is utilized for ease of fabrication. 309H (UNS S30909) is a high carbon modification developed for enhanced creep resistance. It most instances the grain size and carbon content of the plate can meet both the 309S and 309H requirements.
Alloy 309 can be easily welded and processed by standard shop fabrication practices.
|Standard:||ASTM A240,ASME SA240,AMS 5524/5507|
|Thickness:||0.3 ~ 12.0mm|
|Width Range:||4'*8ft',4'*10ft',1000*2000mm,1500x3000mm etc|
|Brand name:||TISCO, ZPSS, BAOSTEEL, JISCO|
|Technique:||Cold Rolled ,Hot rolled|
Foils, Shim Sheet, Rolls, Perforated Sheet, Chequered Plate.
|Applications||Pulp and Paper Textiles Water Treatment|
The chemical composition of grade 309 stainless steel
The physical properties of grade 309 stainless steel
|Density||8 g/cm3||0.289 lb/in³|
The mechanical properties of annealed grade 309 stainless steel
|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|
|Elongation at break (in 50 mm)||45%||45%|
|Hardness, Rockwell B||85||85|
|Hardness, Vickers (converted from Rockwell B hardness)||169||169|
The thermal properties of grade 309 stainless steel
|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|
The designations equivalent to grade 309 stainless steel
|ASTM A167||ASME SA249||ASTM A314||ASTM A580|
|ASTM A249||ASME SA312||ASTM A358||FED QQ-S-763|
|ASTM A276||ASME SA358||ASTM A403||FED QQ-S-766|
|ASTM A473||ASME SA403||ASTM A409||MIL-S-862|
|ASTM A479||ASME SA409||ASTM A511||SAE J405 (30309)|
|DIN 1.4828||ASTM A312||ASTM A554||SAE 30309|
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