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254SMO Stud Bolt (W.Nr.1.4547)
QS Fastener: Perno Roscado 254SMO (W.Nr.1.4547)
Name: 254SMO Stud Bolt (W.Nr.1.4547)
Material: W.Nr.1.4547
Size: M6 to M100
Length: 30 to 3000 mm
Standard: DIN, ANSI
Product Grade: A
Tensile Strength(Rm): 650 N/mm²
Elongation: 35%
Feature: Excellent Resistance to Spot Corrosion and Crevice Corrosion.
Application: For Petroleum and petrochemical equipment, etc.
Price: USD 6.5 - 8.9/ Kg
MOQ: 10kg
Customization: yes
Delivery time: 7-30 Day
Material: W.Nr.1.4547
Size: M6 to M100
Length: 30 to 3000 mm
Standard: DIN, ANSI
Product Grade: A
Tensile Strength(Rm): 650 N/mm²
Elongation: 35%
Feature: Excellent Resistance to Spot Corrosion and Crevice Corrosion.
Application: For Petroleum and petrochemical equipment, etc.
Price: USD 6.5 - 8.9/ Kg
MOQ: 10kg
Customization: yes
Delivery time: 7-30 Day
Quantity
When bolted connections face chloride attack, high temperatures, or acidic media, standard 316L fasteners often fail prematurely. The 254SMO stud bolt, manufactured from W.Nr.1.4547 super austenitic stainless steel, delivers a performance upgrade that bridges the gap between common austenitic grades and expensive nickel alloys.
We supply these stud bolts in diameters from M6 to M100 and lengths ranging from 30 mm to 3,000 mm, fully compliant with both DIN and ANSI dimensional standards. Each batch meets Grade A requirements, with a minimum tensile strength of 650 N/mm² and 35% elongation, ensuring ductility even under extreme thermal cycling.
What sets the 254SMO stud bolt apart is its PREN value of 42 or higher—thanks to a controlled balance of 20% chromium, 18% nickel, and 6.2% molybdenum, reinforced with nitrogen and copper. This composition directly translates into superior resistance against pitting, crevice corrosion, and stress corrosion cracking, particularly in high-chloride environments like seawater scrubbers and offshore platforms.
In actual field applications, these fasteners have proven their reliability in sour service (wet H₂S), flue gas desulfurization units, and high-pressure reactor flanges. The low carbon content (≤0.02%) minimizes intergranular precipitation during welding, while the added copper enhances tolerance to sulfuric and phosphoric acid attacks—common challenges in petrochemical plants.
For engineers specifying critical joint integrity, the 254SMO stud bolt offers a cost-effective alternative to alloy C-276 while outperforming 904L in stagnant seawater conditions. Whether you need a standard double-end threaded rod or a custom long stud with reduced shank, we provide full traceability with mill test reports per EN 10204 3.1.
Choosing this fastener means reducing unplanned downtime, cutting maintenance cycles, and securing asset life in aggressive service environments. From subsea connectors to heat exchanger bundles, the 254SMO stud bolt delivers measurable reliability where it counts.
FAQ
Q1: What is the equivalent material grade for 254SMO stud bolts?
A: UNS S31254, W.Nr. 1.4547, and ASTM A240 grade. It is a super austenitic stainless steel.
Q1: What is the equivalent material grade for 254SMO stud bolts?
A: UNS S31254, W.Nr. 1.4547, and ASTM A240 grade. It is a super austenitic stainless steel.
Q2: What is the maximum length available for 254SMO stud bolts?
A: We manufacture up to 3000 mm continuous length. For longer assemblies, we provide custom double-end studs upon request.
A: We manufacture up to 3000 mm continuous length. For longer assemblies, we provide custom double-end studs upon request.
Q3: Can 254SMO stud bolts replace 316L in marine environments?
A: Yes. With PREN ≥42, 254SMO offers far superior pitting and crevice corrosion resistance than 316L (PREN ~25) in seawater.
A: Yes. With PREN ≥42, 254SMO offers far superior pitting and crevice corrosion resistance than 316L (PREN ~25) in seawater.
Q4: Do these studs come with NACE compliance for sour gas?
A: Yes, they meet MR0175/ISO 15156 requirements for H₂S environments when properly heat-treated.
A: Yes, they meet MR0175/ISO 15156 requirements for H₂S environments when properly heat-treated.
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