1.4005

EN/DIN

Martensitic processing bar with improved workability with the addition of Phosphorus and Sulfur.

Grade 416 has the highest machinability of any stainless steel, which is about 85% of free-cut carbon steel. As with many other free-work stainless steels, improvement in machinability is achieved by the addition of sulfur, which forms manganese sulfur inclusions; This sulfur addition also reduces corrosion resistance, weldability, and formability below the non-free machining equivalent Class 410.

Grade 416 is sometimes used in the unhardened or hardened and highly tempered condition due to its low cost and ready machinability.

Martensitic stainless steels are optimized for high hardness and other properties are somewhat at risk. Fabrication should be done by methods that allow poor weldability and generally allow a final hardening and tempering heat treatment. Corrosion resistance is inferior to common austenitic grades and the useful operating temperature range is limited by loss of ductility at sub-zero temperatures and loss of strength due to excessive tempering at high temperatures.

Electrical Properties

Process Properties

Thermal Recovery

Machinability

Grade 416 round stainless steel offers exceptionally good machinability, the highest of commonly available stainless steels. The best machinability is in the subcritical annealed state.

Weldability

Quality 416 has poor weldability. If welding is required use Class 410 low hydrogen electrodes. Preheat to 200-300 ° C. Immediately afterwards apply annealing or re-curing or stress relieving at 650-675 ° C.

Chemical Composition

Physical Composition

It is used in the construction of power plant, electricity generation, pumps, compressors and turbine wheels.