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We produce screws, nuts and stud bolts in A193 B8M and A320 B8M. This is a NI-Cr austenitic not tempered stainless steel, hardening through cooling warping. It has a higher corrosion resistance than the type 304 regarding the pitting caused by chloride ions.
A193 B8M and A320 B8M is mainly used in equipments for vessels, chemical, pharmaceutical, photographic, food, textile and paper industry, parts of furnaces, heat exchangers and orthopaedic.
The corrosion resistance is excellent in atmosphere and in great variety of salts, organic acids and foods substances; it is quite goods regarding poor solutions of reducing acids, better with respect to other austenitic steels without Mo, to halides and to sea water.
Given the low content of carbon steel , the type 316 is slight susceptible to intercrystalline corrosion, anyway we recommend to avoid the slow heating and cooling between 450-900°C. A193 B8M and A320 B8M 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. The use of electrodes made of the same type of steel is necessary when the use of electrodes is required.
The after-welding treatment is not necessary when the welded sections have a thickness lower than 25mm. Comparable specifications EN 10088/3
| X 5 Cr Ni Mo 17-12-2
| | W. | 1.4401 | | JIS | SUS 316 | | AISI | 316 |
Nominal chemical composition | C | S
| P
| Si
| Mn
| Cr
| Ni
| N
| Mo
| | 0.05 | 0.025
| 0.03
| 0.40
| 1.6
| 17
| 10.50
| 0.050
| 2.00
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Density
g/cm3 20°C - 8.0 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 - 19.0 Specific electric resistance Ω mm2/m 20°C 0.75 No magnetic Mechanical properties at room temperature Yield strength
RP 0.2 N/mmq ≥200 Tensile strenght
Rm N/mmq 500-700 Elongation
A5% ≥40 Reduction of area
Z% ≥60 Hardness
HB ≤215
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