Types and grades of Stainless Steel

Grades of Stainless Steel

We are a long established supplier of stainless steel to all industries

At Brindley Metals we have an unrivalled knowledge of stainless steel it’s properties and applications. We believe in helping our customers it’s how we stand out from the rest and how your company can excel in it’s field.


Rounds – 1/16” dia up to 20” dia

Squares – 3/16” up to 8”

Flats up to 8” wide

Hexagons – 1/8” up to 4”

Austenitic Grades (300 series)

This Group of metals have good or excellent levels of corrosion resistance.

303S31 – Excellent machining grade available in round square & hex bar products.

304S11/S15/S31 – General Engineering quality suitable for bending/fabrication/welding.

316S11/S31 – higher levels of nickel & chrome aid corrosion resistance.

310S31 – Specialist grade developed for use in higher temperature applications (1100 deg C)

321S31 – Excellent grade for use when welding, can be used at elevated temperature 700 Deg C)

347S31 resistant to concentrated nitric acid – usually used for process plant environments

Martensitic Grades (400 Series)

These are a family of heat treatable alloys that bridge the gap between alloy steels and stainless. All of the grades below also have magnetic qualities.

410S21 Petro chemical/gas turbine

416S21 Free machining form of 410 – added sulphur aids machining, used in pumps.

420S29/420S37/420S45 – heat treatable Alloy used in valve industry.

431S29 – general engineering quality

Aisi 440B/C

Ferritic Grades

409 – Usually used in automotive industry for car exhausts & trim

430 – general engineering quality – automotive industry

430FR – specialist grade used for electronic industry (solenoid quality)

Specialist materials

Duplex 31803 – Special fixings/ fasteners

Super Duplex 31254/6MO – Valves & Petro chemical industry.

17/4PH – 15/5PH – 13/8PH – Motor sport & general engineering, hardenable alloys

Stainless Steel

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