We supply screws, nuts and stud bolts in B8 Grade 8. This is a NI-Cr austenitic not tempered stainless steel,  hardening through cooling warping  at better workability.

This material is mainly used for the equipments of food production and preservation, in chemical industry and in architectonic and cars features.

At solubled status, it is corrosion resistant to several substances of chemical, textile, oil, dayring and food industries.

Considering the less content of carob steel, the type 304 is less subject to intercrystalline corrosion than type 302.
We recommend to avoid slow cooling and heating processes between 450-900°C-

B8 Grade 8 has a good heat oxidation resistance upto 850°C in current “on order” conditions, upto 800°C  in in fitful “on-order” conditions. It can be welded without any particular problem, but we recommend not to use austenitic steel electrodes types AISI 308 or 347. The after-welding treatment is not necessary when the welded sections have a thickness lower than 25mm.

Comparable specifications

Nominal chemical composition

Density
g/cm3 20°C - 7.9

Modulus of elasticity
N/mmq 20°C - 200.000

Thermal conductivity
W/m.K. (20°C) - 14.6

Specific heat
J/g.K. (20°C) - 500

Thermal expansion coefficient

20° - 200°C - 16.5

20° - 400°C - 17.5

20° - 600°C - 18.5

Specific electric resistance

Ω mm2/m 20°C 0.73

No magnetic

Mechanical properties room temperature

Yield strength
RP 0.2 N/mmq  ≥190

Tensile strength
Rm N/mmq 500-700

Elongation
A5% ≥45

Reduction of area
Z% ≥60

Hardness
HB  ≤215