Duplex Steel UNS S31803 Bolts are constructed from austenitic-ferritic stainless steel developed to be stronger and more corrosion resistant than 300 series stainless steel. It aids users in avoiding stress corrosion cracking, which is very common with 316 and 317 stainless steel. Duplex steel UNS S31803 bolts are made from a mixture of austenitic and ferritic alloys. The mix of these alloys makes the grade extra strong and resistant to various chemical procedures
Duplex Steel UNS S31803 has been tested at room temperature under reverse bending stress in comparison to SS316.
Duplex Steel UNS S31803 changes from ductile to brittle at -50 degrees celsius and can also become embrittled at 300-1000 degrees celsius. Thus a temperature range of -50 degrees celsius to 300 degrees celsius is suggested. The embrittlement of S31803 bolts is caused by exposure to temperatures exceeding 300 degrees celsius and a reduction in corrosion resistance.
Duplex Steel UNS S31803 Bolts provide an enhanced corrosion solution to stainless, with better sulfide corrosion resistance, chloride pitting resistance, and crevice corrosion resistance than 317L. Duplex Steel UNS S31803 Bolts are resistant to chloride pitting and crevice corrosion thanks to a mixture of chromium, molybdenum, and nitrogen, making them ideal for maritime conditions, closed-loop water systems and some food processing applications. It's crucial to remember that pitting corrosion can be a problem in chloride solutions when oxidizing media is present. In these conditions, the Duplex Steel UNS S31803 Bolts material's passive (protective) layer may be damaged, resulting in localized pitting.
Duplex Steel UNS S31803 Bolts are used on processing equipment, storage containers, and pipelines in the chemical industry. Duplex Steel UNS S31803 Bolts are used in digesters, bleaching equipment, stock-handling systems, and liquid tanks in the pulp and paper industry. Duplex Steel UNS S31803 Bolts are used in marine and oil & gas extraction and processing in chloride and hydrogen sulfide environments.
| Specifications | ASTM F593, F594, F1554 / ASME SF593, F594, F1554 |
| Standard |
DIN : DIN 934, DIN 931, DIN 970, DIN 933 UTS : UNEF, NPT, UNC, UNS, UNF, NPTF ISO : JIS standards, ISO 4033, ISO 4032, ANSI – American National Standards Institute ASME B18.5 ANSI B 28.2.4 1M as per defined in ASME B16.5 standard length ANSI B 18.2.4 2M as per defined in ASME B18.2.2 |
| Size | M3 - M56 | 3/6" to 2" | Custom Sizes |
| Length | 3 mm to 200 mm | Custom Sizes |
| Dimensions | DIN 931, 933, 934, 7991, 976, 125, ASME B18.2.1, B18.3 |
| Form | Hex, Threading, Square, Round as per Gauge Etc. |
| Threads | Unless otherwise specified, the threads shall be rolled or cut and tapped horizontally or vertically |
| Threads available | UNF, BSW, BSF, METRIC, UNC, or as required |
| Threads Configuration |
ASME B1.1 2A/3A – 2B/3B Inch Unified Threads and B1.13M 6h-6G Metric Coarse Threads |
| Certification | Dual Certified As per ASTM & ASME Codes |
| Test Certificate | As per EN 10204 / 3.1 Manufacturer Test Certificate, PED 97/23/EC Certified, Merkblatt AD 2000 W2 Certified |
| Raw materials Source | JSPL, Mukund Steel, Tata Steel, Dhamm Steel, Usha Martin,etc. |
| Packing | IN BULK: canton, pallet, Small Boxs / carton / pallet, or customer request |
| Surface Coating |
Cadmium Coating Hot Dipped Galvanizing Coating Ptfe Coated Phosphate Coating Teflon Coating Xylon Coating Zinc Coating |
| STANDARD | UNS | WERKSTOFF NR. |
| Duplex 2205 | S31803 | 1.4462 |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Fe |
| S31803 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 22.0 – 23.0 | 3.0 – 3.5 | 4.50 – 6.50 | 0.14 – 0.20 | 63.72 min |
| Grade | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| S31803 | 7.8 g/cm3 | 1350 °C (2460 °F) | Psi – 116000 , MPa – 800 | Psi – 80000 , MPa – 550 | 15 % |
