The steel grade 1.4057 ( also called ≈ ASTM 431 and SS2321) is a high tensile strength martensitic stainless steel with good machinability. The steel suits good for production of corrosion resistance details by machining, and where the steel needs to be resistive to strong oxidizing acids e.g. nitric acid. The steel is magnetic and in the quenched and tempered condition.

Some typical application areas for 1.4057:

Pump- and Valve parts

Shafting

Spindels

Piston rods

Fittings

Stirrers

Bolts

Nuts

Weldable steel and easy to machine

1.4057 is possible to weld and shall be welded with welding consumables similar to that of the parent one. The steel is generally easier to machine than ”conventional”  austenitic steels. The heat treatment condition of 1.4057 is QT 800 and it should be hot formed in the temperature range 1100-800°C. Slow cooling after hot forming.