S31803 Duplex Fasteners Specification

S31803 Duplex Fasteners Heavy Hex Bolts Screws Studs Nuts Washers
TorqBolt manufactures high strength S31803 Duplex Fasteners.

UNS S31803 is a chromium nickel molybdenum austenitic and ferritic grade. It has improved resistance to stress corossion cracking, piiting, crevice corrossion and high strengths in comparison to other stainless steel grades. It has very good oxidation resiatnce at high temperatures. However, it is prone to embrittlement at 475 Degree celcious if exposed for more than 2 hours. It is widely used in brewing , power generating equipments and wide varierty of marine and oil and gas applicants. It shows very good weldeabliity similar to ther stainless steels, however, it is not suitable for oxytelene arc welding as there is a possibillty of carbon pickup in the welded area.

S31803 Duplex Fasteners Properties

Chemical Properties
CMnPSSiCrNIMoN
0.03 Max2.00 Max0.03 Max0.02 Max1.00 Max21.0-23.04.50-6.502.5-3.50.08-0.20

Mechanical Properties
Yeild strengthTensile strengthElongationReductionHardness
MpaMpa%%BHN
minminminmin
4506202550297

Physical Properties
DensityElastic ModulusMean Coefficient of ThermalThermal ConductivitySpecific HeatElectrical Resistivity
(Kg/m3)(Gpa)Expansion(?m/m/°C)(W/m.K)0-100°C(µ?.m)
781019011 X10-6154000.85

Heat Treatment
Solution Annealed @1020°C & liquid Quenced @260°C

Equivalent Designation
ASTM/ASMEAISIUNSBritish StandardWerkstoff No.En NameSwedish(SS)JIS(SUS)
Sa 182 F51–S31803318S131.4470X2CrNiMoN22-5-32377SUS 329J3L

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