Stainless Steel Grades
Stainless Sales Corporation offers a wide range of austenitic and ferritic grades in stainless steel flat rolled coil.
We’ve compiled extensive information about stainless steel grades and how they compare with one another. We hope this helps you make an informed decision when selecting stainless steel for your application.
The list of datasheets represents most of our stocked grades. Details on additional stainless steel grades are available upon request – simply contact one of our knowledgeable sales professionals.
HOW TO SELECT A GRADE
Stainless steels are engineering materials with good corrosion-resistance, strength and fabrication characteristics. They can readily meet a wide range of design criteria, including load, service life and low maintenance. Selecting the proper stainless steel grades involves weighing four qualities in the following order of importance:
- Corrosion or Heat Resistance, the primary reason for specifying stainless. The specifier needs to know the nature of the environment and the degree of corrosion or heat resistance required.
- Mechanical Properties, particularly strength at room, elevated or low temperature. The combination of corrosion resistance and strength is the basis for selection.
- Fabrication Operations and how the product will be made (e.g., forging, machining, forming, welding, stamping, roll forming, four-slide operations).
- Total Cost, including material and production costs and considering the cumulative savings of a maintenance-free product with longevity.
The corrosion, heat resistance and mechanical properties are all affected by the chemical composition of the stainless steel. As the composition of the steel is varied, so are the properties. The major alloying elements of stainless steel include:
- Forms a passive surface film to make stainless steel resistant to corrosion.
- Increases the scaling resistance, tensile strength and wear resistance.
- Improves hot-working properties.
- Up to 2% has no effect on strength, ductility and toughness.
- Above 2% increases yield strength and tensile strength (as in the 201 grade).
- Important as a partial replacement of nickel in the 201 grade.
- Stabilizes the austenitic structure.
- Increases creep resistance; strength at high temperatures; and corrosion resistance, particularly in sulfite, sulfate, acetic acid and acetate solutions and in a salt-water atmosphere.
- Expands range of passivity and counteracts tendency to pit.
- Stabilizes the austenitic structure.
- Increases high-temperature strength; ductility, which makes stainless steel easier to form; and corrosion resistance, particularly in industrial and marine atmospheres and the chemical-, food- and textile-processing industries.
- Increases scaling resistance by forming a tight initial scale that will withstand cyclic temperature changes; also slightly increases tensile strength and hardness.
- Resists carburizing at high temperatures.
- When 1% or more, improves resistance to strong sulfuric acid but offers little improvement for dilution and is unfavorable in nitric-acid service.
*Note: Ductility decreases as silicon content increases.
Sulfur – Phosphorous – Selenium
- Increases machinability.
- Decreases ductility and transverse tensile strength.
Titanium – Columbium – Tantalum
- Prevents intergranular corrosion by stabilizing the carbon as titanium or columbium carbides.
- Produces finer grain size.
- Reduces stretcher strains from drawing and forming by their addition to type 430.
For a comparison of chemical and mechanical properties of common austenitic and ferritic grades of stainless steel according to ASTM A240, click here.
Type 201 stainless steel (UNS S 20100) is a low nickel, high-work hardening, austenitic chromium-nickel-manganese stainless steel that was developed to conserve nickel....Read More
Type 301 stainless steel (UNS S 30100) is an austenitic chromium-nickel stainless steel that can attain high tensile strength and ductility by cold-working....Read More
Stainless Sales has stock in 301 Full Hard to ASTM A666/ AMS 5519 flat-rolled stainless steel....Read More
Type 304 stainless steel (UNS S 30400) is the most common austenitic chromium-nickel stainless steel. It can be used in a multitude of applications....Read More
Type 304L (UNS S30403) stainless steel has an extra-low carbon content and is a variation of Type 304....Read More
Type 304 deep draw quality (304 DDQ) stainless steel is an austenitic chromium-nickel stainless steel that is used in special applications that require deep drawing and excellent formability...Read More
Type 305 (UNS S30500) is an austenitic chromium-nickel stainless steel that has excellent corrosion resistance due to a higher nickel content....Read More
Type 310/310S (UNS S31000/S31008) is an austentic stainless steel that can withstand high temperatures and has great resistance to oxidation and creep deformation....Read More
Type 316L (UNS S31603) stainless steel has an extra-low carbon content and is a variation of Type 316....Read More
Type 321 (UNS S32100) is an austenitic stainless steel that has fives times more titanium than carbon in its content....Read More
Type 347 (UNS S34700) is an austenitic stainless steel that is stablizied by the presence of niobium and tantalum....Read More
Type 409 (UNS S40900) is a ferritic stainless steel that has a good combination of heat resistance and corrosion resistance....Read More
Type 409 ULTRA FORM (UNS S40920) is a ferritic stainless steel that provides improved forming and welding over standard Type 409....Read More
Type 409 Aluminized is a ferritic stainless steel that is dipped in an aluminum coating....Read More
Type 410 (UNS S41000) is a martensitic stainless steel that can achieve a variety of properties through heat treatment....Read More
Type 430 (UNS S43000) is a ferritic stainless steel that has resistance to oxidation up to 1500ºF along with good ductility and corrosion resistance....Read More
Type 439 is a ferritic stainless steel that is best suited for use in oxidizing environments, where excellent corrosion resistance is needed....Read More