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UNS S32760 super duplex stud bolts are specified for severe chloride and offshore bolting where a high localized-corrosion margin and high strength are required. S32760 includes deliberate tungsten and copper additions and must be ordered as its own UNS grade—not as a generic substitute for S32750.
Product specifications
| Обозначение материала | Super duplex stainless steel; UNS S32760; EN 1.4501 |
|---|---|
| Материал / bar reference | ASTM A276 или ASTM A479 where the specified bar form, UNS S32760 and condition are covered |
| Finished fastener reference | Project or operator fastener specification; any ASTM fastener reference must be checked for alloy, condition and dimensional scope |
| Stud configuration | Fully threaded stud bolts; custom double-end details by approved drawing |
| Inch threads | UNC, UNF and 8UN to ASME B1.1 as specified |
| Metric threads | Coarse or fine metric threads to ASME B1.13М / ISO requirements as specified |
| Размеры | Diameter and length to flange bolting schedule, ASME B18.31.2 reference or approved drawing |
| Matching nuts | Compatible heavy hex or project-design nuts supplied after material and property review |
| Документация | EN 10204 3.1 МТС, heat traceability and dimensional report; PMI/NDT/testing optional |
Why specify Super Duplex S32760 stud bolts?
S32760 is widely evaluated for severe seawater, subsea, produced-water and chemical duties. The alloy’s chemistry, microstructure and heat treatment are central to performance. A complete specification should control material source, обработка раствором, механические испытания, corrosion testing and traceability.
Corrosion resistance and material limits
The alloy is intended to resist pitting, crevice corrosion and chloride stress-corrosion cracking in demanding environments. The bolted joint still contains crevices and contact surfaces, so gasket design, депозиты, cathodic protection, dissimilar metals and operating temperature remain part of material selection.
Инженерное примечание: Material selection must be based on the complete process environment and governing design code. Product-page information is not a design allowable or a guarantee of service life.
Temperature and mechanical-property control
S32760 is not a general high-temperature alloy. Confirm the code design range, toughness testing and any environmental cracking limits. For hot reducing or strongly acidic service, a nickel alloy may be more appropriate after engineering review.
Типичные применения
- Subsea manifolds, connectors and valve bolting
- Seawater lift, injection and cooling systems
- Offshore produced-water equipment
- Desalination and high-chloride process skids
- ФГД, scrubber and aggressive chemical equipment
Стандарты, threads and flange fit-up
The material specification controls alloy chemistry, форма продукта, heat treatment and mechanical tests. The finished-fastener specification controls stud manufacture and acceptance. The flange standard or bolting schedule controls diameter, thread and length. These documents perform different jobs and should all be identified at order review.
Cut threads and rolled threads can produce different dimensional, surface and residual-stress characteristics. State the required manufacturing method when it is a design requirement. Thread fit, end chamfers, nut engagement and exposed thread allowance must match the assembly procedure.
Matching nuts, lubrication and galling control
High-alloy studs should be purchased as part of an engineered bolting system. Nut material and proof strength must support the specified stud properties without creating an unacceptable corrosion couple. Clean threads, controlled surface finish and an approved lubricant reduce galling and torque scatter.
Torque values are not universal. Friction coefficient, coating or lubricant, nut condition, tightening sequence and reuse policy all affect achieved preload. Use a project-approved torque-tension or hydraulic-tensioning procedure.
Производство, осмотр и документация
Production can include material verification, sawing, окончательная подготовка, thread machining or rolling, cleaning, dimensional inspection and permanent identification. Heat numbers remain traceable through manufacturing. Additional controls can include PMI, твердость, tensile tests, impact tests, microstructure examination, коррозионные испытания, ultrasonic testing or dye penetrant testing when specified.
Inspection documents should identify the ordered UNS grade, material specification and condition—not only a trade name. Сторонняя проверка, EN 10204 3.2 certification and customer hold points can be incorporated before production when agreed.
What to include in your RFQ
Call out UNS S32760 explicitly, plus the governing bar and fastener specifications, solution-annealed condition, mechanical requirements, microstructure/ferrite acceptance, коррозионные испытания, NACE/NORSOK requirements and PMI scope.
- Exact UNS designation and governing material specification/edition
- Finished-fastener and dimensional standard
- Диаметр, серия ниток, pitch and overall length
- Required material condition and mechanical properties
- Nut and washer material, dimensions and quantity
- Design temperature, process environment and special service standard
- Тестирование, инспекция, traceability and certificate type
- Lubrication, покрытие, маркировка, packing and delivery requirements
Authoritative material reference
Review Outokumpu Forta SDX 100 / S32760 data together with the contractually required ASTM/ASME/ISO editions. Manufacturer literature supports material screening; the purchase order and governing code control supply.
Related stud bolt materials
Часто задаваемые вопросы
What is the difference between S32760 and S32750?
Both are super duplex grades, but their specified chemistries differ; S32760 includes tungsten and copper additions. Qualification and substitution require engineering review.
Can S32760 stud bolts be supplied for NORSOK projects?
Supply can be reviewed against the exact NORSOK MDS, IOGP supplement, диапазон размеров, qualification and testing requirements stated in the inquiry.
Is PMI available on every stud and nut?
Yes when agreed, but the RFQ must define the PMI method, sampling or 100-percent extent, acceptance criteria and marking requirements.
How is galling controlled?
Use compatible nut material, clean threads, controlled surface condition and an approved lubricant with a torque-tension procedure validated for the joint.
Trade names are used for material identification. INCONEL®, INCOLOY® and MONEL® are trademarks of Special Metals Corporation; HASTELLOY® is a trademark of Haynes International, Inc. SASA FLANGE supplies products to the specifications stated on the accepted order.
