1.4057

The exact composition varies for martensitic stainless steel grades. Typically however, 1.4057 stainless steel will contain: 15 - 17 % chromium; 2% - 2.5% Nickel; 0.12 - 0.22% Carbon. It may also contain small amounts of silicon, molybdenum and phosphorus.

Chromium is the main alloying element of martensitic 1.4057 stainless steel, which inherently carries moderate corrosion resistance to a material with high strength and hardness . Normally, concentrations of 2 - 2.5 % nickel are added as a stabilizing element to ensure that a martensitic steel retains its toughness properties during heat treatment, which allows the manufacture of a range of component types.

1.4057 m artensitic stainless steels are often forgotten, perhaps because they are not in high demand compared to austenitic and ferritic grades. Yet they often play a large and often unseen role in modern infrastructure. The strength gained by heat treatment depends on the carbon content of the alloy. Increasing the carbon content increases the potential hardness and strength but decreases the toughness and ductility .

Higher carbon grades can be heat treated to a hardness of up to 60 HRC . Optimum corrosion resistance is achieved in the heat treated, hardened and tempered condition. Other martensitic grades were formed with additions of nickel and nitrogen, but have lower carbon levels than conventional grades. 431 (1.4057) stainless steels have better weldability , toughness and corrosion resistance.

Electrical Properties

Process Features

Thermal Recovery