N690, as a new type of super corrosion resistant high strength die steel, is a new type of cobalt-Mo-vanadium martensitic stainless steel produced by electroslag resolution (ESR) technology.

N690 die steel is often used to harden tools and high-strength components due to its excellent die properties such as super corrosion resistance, high strength and high hardness. Such as making corrosion-resistant bearings, corrosion-resistant medical instruments, optical products, hardening tools and other fields.

N690 die steel supply form: rolled material, finishing, fine grinding

N690 application

Belo N690 corrosion-resistant mirror die steel is treated with ESR technology to make its microstructure more pure and fine, which is ideal for hardened tools and high-strength components.

Its applications are as follows:

Suitable for corrosion resistant bearings

High precision nozzle, valve, piston

Cutting instrument

Hardening of the cutting tool

Refrigeration equipment

Encapsulation moulds

Physical properties

Temperature 20 ℃ 200 ℃

Density kg/ Dm3 770 --

Elastic coefficient N/mm2 223000 209000

Thermal expansion coefficient from 20℃ -- 10.8 x 10-6

Thermal conductivity W/MK 15 --

Specific heat J/kg℃ 430 --

Mechanical properties of N690 high strength die steel at room temperature

State hardness HB/HRC

Soft annealing to 285HB

Hardening of 60-62 HRC

Annealed and tempered 58-60 HRC

N690 high strength die steel heat treatment

BohlerN690 (440C MOD) chemical composition %

C Cr Mo V Si Co Mn

1.07 17.00 1.1 0.1 0.4 1.5 0.4