Alloy Steel 304 - widely used in the Aerospace industry

Stainless Steel 304

Corrosion Resistant Stainless 304 – AMS5511 | AMS5513 | AMS5516 | AMS5639 | AMS5647 | AMS5566 | AMS5567 | AMS5569 | AMS-T-6845 | Mil-T-8504 | Mil-T-8606 | QQS-763 | UNS S30403 | UNS S30400

Product description

304L grade with 0.030% maximum carbon is similar to the 304 grade, but with much enhanced performance in the sensitization range. Due to its superior resistance to intergranular corrosion following stress relieving or welding, Type 304L is broader in application versatility. The extra-low carbon 304L is required when welding joins heavy sections or an aggressive corrosion environment exists and post-weld annealing is not possible. 304L will become sensitized if exposed for long periods of exposure to service temperatures of 800°-1600°F. Type 304L is used where welding is required but the carbide precipitation tendency of Type 304 will impair that alloys corrosion resistance.

304 is suitable for use in a variety of applications, in fact it is the most common stainless steel, and about 60% of all stainless steel used in the world is grade 304.

Strictly speaking, stainless doesn’t rust, but like all materials, there are some environments which are just too corrosive and it will be attacked. When stainless is attacked, the corrosion product looks just like the rust you get on carbon steel.

The corrosion resistance of stainless steels mostly depends on their content of the alloying elements chromium and molybdenum, plus a few other factors, depending on the specific application. The surface finish and fabrication practice can have a major effect.

Technical Specification

Specification Material Publication Date
AMS5513 Steel, Corrosion-Resistant, Sheet, Strip, and Plate 19Cr – 9.2Ni (SAE 30304) Solution Heat Treated 15/06/1953
AMS5516 Steel, Corrosion-Resistant, Sheet, Strip, and Plate 18Cr - 9.0Ni (302) Solution Heat Treated 23/01/1940
AMS5639 Steel, Corrosion-Resistant, Bars, Wire, Forgings, Mechanical Tubing, and Rings 19Cr - 10Ni Solution Heat Treated 01/06/1953
AMS5647 Steel, Corrosion-Resistant, Bars, Wire, Forgings, Mechanical Tubing, and Rings 19Cr - 9.5Ni Solution Heat Treated 01/12/1953
AMS5566 Steel, Corrosion Resistant, Seamless or Welded Hydraulic Tubing 19Cr - 10Ni (304) High Pressure, Cold Drawn 01/06/1946
AMS5569 Steel, Corrosion and Heat Resistant, Seamless and Welded Hydraulic Tubing 19Cr - 9.5Ni - 0.03C max Cold Drawn, 1/8 Hard Temper 01/09/2000
AMS-T-6845 Tubing, Steel, Corrosion-Resistant (S30400), Aerospace Vehicle Hydraulic System 1/8 Hard Condition 01/01/1999
Mil-T-8504 Mil-T-8504B, Military Specification: Tubing, Steel, Corrosion-Resistant (304), Aerospace Vehicle Hydraulic Systems, Annealed, Seamless and Welded 01/07/1991
AMS5567 Steel, Corrosion Resistant, Seamless or Welded Hydraulic Tubing 19Cr - 10Ni (304) Solution Heat Treated 01/01/1964
Mil-T-8606 Military Specification: Tubing, Steel, Corrosion-Resistant 18/06/1973
AMS5511 Steel, Corrosion-Resistant, Sheet, Strip, and Plate 19Cr - 9.5Ni (304L) Solution Heat Treated 01/11/1949

300 series austenitic stainless steels are non-magnetic. When nickel is added to stainless steel in sufficient amounts, the crystal structure changes to “austenite.” The basic composition of 300 series austenitic stainless steels is 18% chromium and 8% nickel. This enhances their corrosion resistance and modifies the structure from ferritic to austenitic. Austenitic grades are the most commonly used stainless steels, accounting for more than 70% of production.

Technical Data

Mechanicals Chemistry
SpecificationTensile StrengthYield StrengthElongation
AMS5511100 KSI Max40% Min
AMS551375 KSI Min30 KSI Min40% Min
AMS563975 KSI Min30 KSI Min40% Min
AMS556695-130 KSI60-90 KSI25% Min
AMS5567100 KSI Max30 KSI Min40% Min
AMS556910-140 KSI75-100 KSI 20% Min
ElementLower %Upper %
Carbon-0.030
Manganese-2.000
Silicon-1.000
Phosphorus-0.040
Sulfur-0.030
Chromium18.00020.000
Molybdenum-0.750
Columbium (Niobium)--
Titanium--
Aluminium--
Cobalt--
Copper-0.750
Nickel8.00011.000

Aerocom Stock List

Sheet & Plate Bar
Sheet Size (Inches)
Thickness (Inches)60" x 36"60" x 48"60" x 12"
0.016X
0.020X
0.025XX
0.032X
0.040X
0.050X
0.063X
0.080X
0.100X
0.125X
0.160X
0.190X
0.250X
0.500X
0.750X
1.000X
1.500X
Temper
Diameter (Inches)
0.125X
0.250X
0.375X
0.438X
0.500X
0.625X
0.750X
0.875X
1.000X
1.125X
1.250X
1.500X
1.750X
2.000X
2.500X

Our Approvals

Leonardo Aerostructures Leonardo Aircraft Leonardo Helicopters Airbus Helicopters
UTC SAFRAN GE Power ISO9001:2015
AS9120B Westland SQA50 Britten-Norman

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