Duplex Steel Fasteners

Q: Are Duplex steel fasteners resistant to corrosion?

Yes, Duplex steel fasteners exhibit excellent corrosion resistance, particularly in chloride-rich environments, making them suitable for applications in marine, offshore, and chemical processing industries.

Q: Can Duplex steel fasteners be welded?

Yes, Duplex steel fasteners can be welded using appropriate welding techniques and compatible filler materials, ensuring proper joint integrity and maintaining corrosion resistance.

Q: Are Duplex steel fasteners suitable for high-temperature applications?

Yes, certain grades of Duplex steel fasteners offer good temperature resistance and can be used in high-temperature applications such as petrochemical processing and power generation.

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Duplex Steel Fasteners Manufacturer, Exporter and Supplier in Auckland, New Zealand.

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Duplex steel fastenersare hardware parts like bolts, screws, nuts, washers, and studs manufactured from duplex stainless steel, a category of stainless steel alloy defined by a two-phase microstructure made up of both austenitic and ferritic phases. This dual-phase makeup gives duplex steel fasteners distinctive characteristics, such as high strength, superb corrosion resistance, and solid weldability.

Duplex Steel Fasteners Specifications

Specifications	:	ASTM A182 / ASME SA182
Size	:	1/8″ NB TO 24″ NB
Standards	:	ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc.
Class / Pressure	:	150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc.
Standard	:	ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc.
Grades	:	S31803 / S32205 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F6

Duplex Steel Fasteners Chemical Composition

Phosphorus	Sulphur	Silicon	Carbon	Manganese	Nickel	Molybdenum	Nitrogen	Copper	Chromium
0.035 % max	0.02 % max	0.80 % max	0.03% Max	1.20 % max	6.00 – 8.00 %	3.00 – 5.00 %	0.24 – 0.32 %	0.50 % max	24.0 – 26.0 %

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Duplex Steel Fasteners Mechanical Properties

Grade	YS (MPa)	UTS (MPa)	% Elongation	Hardness(BHN)
UNS S32750	550 min.	795 min.	15 min.	310 max.
UNS S32760	550 min.	750 min.	25 min.	270 max.

Top Duplex Steel Fasteners Manufacturing Company in Auckland

At Koasteel, we take pride in being the largest supplier and manufacturer in the New Zealand, delivering advanced solutions for every one of your piping requirements. With cutting-edge production facilities strategically positioned across New Zealand, we maintain an extensive inventory of more than 25,000 tons of top-quality materials kept ready in stock.

Duplex Steel Fasteners Grades

Reach out to us for a fast quote tailored to your needs.

We supply these Duplex Steel Fasteners in accordance with DIN, ISO, JIS or ANSI Standard.

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Advantages of Duplex Steel Fasteners

High Corrosion Resistance: Duplex steel fasteners deliver better corrosion resistance than conventional stainless steel fasteners, especially in chloride-heavy settings such as marine and coastal regions.
Excellent Strength: Duplex steel fasteners have greater strength than austenitic stainless steels, which makes them well suited for applications demanding high mechanical performance.
Good Weldability: Duplex steel fasteners show good weldability, enabling straightforward fabrication and assembly across a range of applications.
High Toughness: Duplex steel fasteners have high toughness, offering resistance to brittle fracture and impact loading, which boosts their durability in demanding conditions.
Stress Corrosion Cracking Resistance: Duplex steel fasteners withstand stress corrosion cracking, a frequent problem in harsh settings that contain chloride ions.

Types of Duplex Steel Fasteners

ASTM A182 F51 Fasteners, Duplex F60 Fasteners, Ferritic Duplex Stainless Steel S31803 Socket Head Cap Screw, S31803 Duplex Heavy Hex Nut, Duplex S32205 Hex Head Bolt in Christchurch, UNS S32205 Duplex Steel Lock Hex Nut, Duplex Steel 2205 Spring Washer Suppliers in Auckland, New Zealand.

Duplex Steel Fasteners Uses

Application Industry

Duplex steel fasteners serve a crucial function throughout a wide range of industrial fields, owing to their outstanding characteristics. Commonly employed in sectors like chemical processing, oil and gas, marine, and offshore, these fasteners deliver excellent corrosion resistance and mechanical strength.

Oil & Gas Industry

Aviation Industry

Offshore Drilling

Power Generation Industry

Chemical Processing: Duplex steel fasteners are widely applied in chemical processing plants for components such as reactors, pipelines, valves, and pumps, where they endure corrosive chemicals and acidic conditions.
Oil and Gas Industry: Duplex steel fasteners are used in offshore platforms, refineries, pipelines, and subsea equipment, where they hold up against corrosion from demanding surroundings, including seawater, hydrocarbons, and high-pressure conditions.
Marine Engineering: Duplex steel fasteners serve marine settings for shipbuilding, offshore structures, desalination plants, and underwater pipelines, delivering outstanding corrosion resistance against saltwater exposure and severe weather conditions.
Offshore Drilling: Duplex steel fasteners are applied in offshore drilling and exploration for components such as risers, wellheads, subsea pipelines, and platforms, where they endure corrosive surroundings and high levels of chlorides.
Power Generation: Duplex steel fasteners are used in power generation facilities such as nuclear power plants, gas turbines, and steam turbines for uses such as boiler assemblies, turbine components, and heat exchangers, where they provide corrosion resistance and strong high-temperature performance.

How to Choose the Right Duplex Steel Fasteners

Identify Application Requirements: Identify the working conditions, including temperature, pressure, corrosion exposure, mechanical loads, and any other factors the fasteners will encounter.
Select the Appropriate Duplex Steel Grade: Duplex steel fasteners come in several grades, with each providing varying degrees of corrosion resistance, strength, and temperature stability. Select the grade that best fits what your application demands.
Consider Fastener Type and Configuration: Identify which fasteners are required (bolts, screws, nuts, washers, etc.) along with their specifications (size, thread type, head style, etc.), guided by the particular assembly needs and structural considerations.
Evaluate Environmental Factors: Take into account exposure to corrosive agents like chlorides, acids, alkaline solutions, and seawater so you can choose Duplex steel fasteners offering suitable corrosion resistance and durability.
Assess Load Requirements: Assess the mechanical loads, stresses, and vibration levels the fasteners will face while in operation to confirm they possess the required strength, fatigue resistance, and reliability.

What types of Duplex steel grades are used for fasteners?

Duplex steel fastenersare offered in a range of grades, such as Duplex 2205, Duplex 2304, Duplex 2507, and more, with each providing varying degrees of corrosion resistance, strength, and thermal stability.

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FAQ (Frequently Asked Questions)

Are Duplex steel fasteners resistant to corrosion?

Yes, Duplex steel fasteners demonstrate outstanding resistance to corrosion, especially in environments high in chlorides, which makes them well-suited for use in marine, offshore, and chemical processing industries.

Can Duplex steel fasteners be welded?

Yes, Duplex steel fasteners is weldable when suitable welding methods and compatible filler materials are used, guaranteeing sound joint integrity and preserving corrosion resistance.

Are Duplex steel fasteners suitable for high-temperature applications?

Yes, some grades of Duplex steel fasteners provide strong resistance to temperature and are suitable for high-temperature uses like petrochemical processing and power generation.