Martensitic Stainless Steels
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410S21’R’ 
420S29’R’ 
431S29’T’ * Materials where applicable are supplied in accordance with NACE MR0175
Rounds: 3mm dia. to 520mm dia
Rectangular: 50.8mm x 12.7mm to 240mm x 75mm
Square: 12.7mm Sq. to 50.8mm Sq
Properties
- High strength
- Good hardness & toughness
- Moderate corrosion resistance
- Magnetic
- Poor weldability
Martensitic stainless steels are low carbon steels built around the Type 410 composition of Iron, 12% to 15% Chromium, and 0.08% to 0.50% Carbon. They can be heat treated and hardened and are often tempered to give good hardness and high toughness. Untempered martensite is low in toughness and therefore brittle. Type 431 has the addition of Nickel to further improve the properties. Martensitic steels have poor corrosion resistance compared to austenitic steels.
Applications
Martensitic stainless steel is often used when hardness is critical, such is in knives, where surface hardness creates a sharper blade, also for medical tools (scalpels, razors and internal clamps), gears, valves, pumps, shafts, bearings, turbine parts.
