Stainless steel has various grades and types. The phenomenal nature of stainless steel is electrifying of Grade 304 vs Grade 309. The stipulation of stainless steel is whopping internationally. Stainless steel has various grades and types. Austenitic stainless steel has superior corrosion resistance with remarkable strength.
Grade 304 and 309 are known for peculiar properties and uses. Grade 304 is the commercially sound grade, whereas grade 309/309s an edge over 304 stainless steel when it comes to general corrosion resistance at elevated temperatures.
Stainless steel grade 304 stainless steel is a t 300 series stainless steel austenitic. It has a minimum of 18% chromium and 8% nickel, combined with a maximum of 0.08% carbon. It is defined as a chromium-nickel austenitic alloy. Stainless steel grade 304 is the standard "18/8" Stainless that you will probably see in your pans and cookery tools. How to Buy 304 Stainless Steel Coil?
Stainless steel grade 309 is austenitic chromium-nickel stainless steels that are often used for higher temperature applications. Due to their high chromium and nickel content, stainless steel grade 309 is highly corrosion resistant, have outstanding resistance to oxidation, and excellent heat resistance while providing good strength at room and elevated temperatures.
| Grade | C | Mn | P | S | Si | Cr | Ni | N |
| 304 (S30400) | ≤0.07 | ≤2.00 | ≤0.045 | ≤0.030 | ≤0.75 | 17.5-19.5 | 8.0-10.5 | ≤0.10 |
| 309(S30900) | ≤0.2 | ≤2 | ≤0.045 | ≤0.03 | ≤1 | 22-24 | 12.0-15.0 |
All stainless steel is magnetic except austenitic stainless steel which is actually 300 series stainless such as 304 and 316. However, 300 series stainless is non-magnetic only after it is freshly formed. 304 is almost for sure to become magnetic after cold work such as pressing, blasting, cutting, etc.
Stainless steel grade 309/309s (uns s30900/s30908) austenitic stainless steel is typically used for elevated temperature applications. Its high chromium and nickel content provides comparable corrosion resistance, superior resistance to oxidation, and the retention of a larger fraction of room temperature strength than the common stainless steel grade 304.
Stainless steel grade 309 is employed for parts requiring both corrosion and heat resistance and oxidation resistance up to 2000 °f. Strength at elevated temperatures is similar to that of 18-8 stainless steels. This alloy posses excellent resistance to oxidation as well as high tensile and creep strengths at elevated temperatures. Some examples include, but are not limited to: Heating elements, aircraft and jet engine parts, heat exchangers, carburizing annealing products, Sulfite liquor handling equipment, kiln liners, boiler baffles, refinery and chemical processing equipment, auto exhaust parts,etc.
Stainless steel grade 304 is used in a wide variety of home and commercial applications, including: Kitchen benches, sinks, troughs, equipment, and appliances, chemical containers, including for transport, food processing equipment, particularly in beer brewing, milk processing, and wine making, heat exchangers, architectural trim and molding, woven or welded screens for mining, quarrying & water filtration, automotive and aerospace structural use, nuts, bolts, screws, and other fasteners in the marine environment, construction material in large buildings, dyeing industry, etc.
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