Duplex Steel Fasteners

AISI 4130 Bolts

Duplex steel fasteners offers superiority over standard stainless steel fasteners. We produce duplex stainless steel fasteners in varitie sof bolts, screws, stud bolts, studs, threaded rods, nuts, washers, dowel pins & customised as per drawing. We manufacture fasteners in duplex stainless steel alloys 2205, 2304, S31803, s32205, S32304 & their equivalent grade designation Uranus 45n, DIN EN 1.4462, etc. Duplex Steel Fasteners are mostly hot forged fasteners and key specification includes ASTM A1082. However duplex fasteners are exclusively hot forged under ASTM A182 forging specifications. Duplex 2205 Fasteners are widely used among duplex steel fasteners. Duplex steel fasteners have high strength and moderate to high corrosion resistance in comparison to stainless steel 304/316 & 317.

Duplex Steel is a dual phase stainless steel with equal composition of ferritic and austenitic phase. Owing to which duplex steel exhibits combined properties of regular 300 series austenitic stainless steel and 400 series ferritic steel. Duplex stainless steel has grown popularity in recent years with combined property and lower cost as compared to its precursor parent steel category. Duplex Steel has tremendous potential in fastener industry. Duplex 2205 is currently the most prominent grade among all other duplex grades to be used for fastener manufacturing.

Types of Duplex Steel Fasteners

Duplex Steel Fastener Grades

ASTM Specifications for Duplex Steel Bolts & Nuts

Duplex Stainless Steel Fasteners are manufactured from forging, bar stock or bolting specification listed as under.

Specifications Form Grade Products
ASTM A36 Bars & Plates ... Bolts, Screws, Stud Bolts, Nuts, Washers & Bar Components
ASTM A307 Bolting Grade A, B Bolts, Screws, Stud Bolts, Nuts, Forged Components
ASTM A325 Bolting Type 1 Heavy Hex Structural Bolts
ASTM A449 Bolting Type 1, Type 2 Bolts, Screws, Stud Bolts, Threaded Rods, Nuts & Bar Components
ASTM A489 Bolting ... Lifting Eye Bolts
ASTM A540 Bolting Grade B21, B22, B23, B24, B24V Bolts, Screws, Stud Bolts, Threaded Rods, Nuts & Bar Components
ASTM F1554 Bolting Grade 36 Anchor Bolts
ASTM F3125 Bolting Type 1 Heavy Hex Bolts

Applications for Duplex Steel Bolting

Duplex stainless steel fasteners are used in bolting pipeline flanges, process equipments, components and other instruments operating in following sectors.