Natural Steels is the recognized as manufacturer, exporter, and supplier of Duplex UNS S31803 Fasteners. Being a reliable firm we aim to satisfy the needs and requirements of the patrons. However, we offer our best quality standard product at a cost-effective price. The manufacturing of these fasteners begins with the use of high quality of raw material purchased from the reputed merchants of the industry. Moreover, we use the art of machinery and the latest technology to obtain the standard product.
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We supply the product in a comprehensive range, shapes, size, and dimensions in compliance with the needs and constraints mention by the customers. Our product founds its utility in various industrial applications. These are highly admired by our esteem patrons due to its attributes and feature it having.
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Fasteners made of duplex stainless steel S31803 have molybdenum, nickel, and chromium content in a small percentage. Duplex means dual microstructure present in this alloy. They are two-phase austenitic, ferritic steel fasteners. Duplex Steel S31803 Fasteners have a high yield strength and good fatigue resistance. In harsh environments, the fasteners show good resistance to pitting, stress corrosion cracking, and crevice corrosion. They also survive stress corrosion situations caused by chloride and sulfur dioxide quite well.
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Duplex Steel S31803 / S32205 Fastener Specification
Specifications |
ASTM A479 / ASME SA479 |
Dimensions |
DIN 931, 933, 934, 7991, 976, 125, ASME B18.2.1, B18.3 |
Size |
Bolt / Screw Size : M3 – M56 | 3/6″ to 2″ | Custom Sizes
Nuts Size : M3 – M56 | 3/6″ to 2″ | Custom Sizes
Washers Size : M3 – M56 | 3/6″ to 2″ | Custom Sizes
Machine Screws Size : M1.6 – M12
Self Tapping Screw Size : No.2 – No. 14 |
Length |
3 mm to 200 mm |
Threads |
UNF, BSW, BSF, METRIC, UNC, or as required |
Surface Coating |
Ptfe Coating
Phosphate Coating
Teflon Coating
Zinc Coating
Hot Dipped Galvanizing Coating
Cadmium Coating
Xylon Coating |
Duplex Steel S31803 / S32205 Fastener Equivalent Grades
STANDARD |
UNS |
WNR. |
Duplex Steel 2205 |
S31803 / S32205 |
1.4462 |
Duplex Steel S31803 / S32205 Fasteners Chemical Composition
S31803 / S32205 |
C |
N |
P |
Si |
Mn |
Mo |
Fe |
Cr |
S |
Ni |
1.0 |
0.03 |
0.02 |
2.0 |
3.0 – 3.5 |
22.0 – 23.0 |
0.03 |
4.5 – 6.5 |
0.14 – 0.2 |
Bal |
Mechanical Properties Of Duplex Steel S31803 / S32205 Fasteners
S31803 / S32205 |
Density |
Melting Point |
Yield Strength (0.2%Offset) |
Tensile Strength |
Elongation |
7.8 g/cm3 |
1350 °C (2460 °F) |
Psi – 80000 , MPa – 550 |
Psi – 116000 , MPa – 800 |
15 % |
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