Excellent General Corrosion Resistance
High nickel, chromium and molybdenum contents provide excellent resistance in aggressive chemical and industrial process environments.
Specialty Alloy Fasteners
Super Austenitic Stainless Steel Fasteners Manufacturer
High-performance super austenitic bolts, stud bolts and custom fasteners engineered for chemical, seawater and highly corrosive industrial applications.
High-Alloy Austenitic Expertise
904L, 254SMO and Alloy 926 fasteners for severe corrosion and chloride-bearing environments.
Superior Corrosion Resistance
High nickel and molybdenum contents provide excellent resistance to acids, chlorides and localized corrosion.
Custom Manufacturing
Standard and drawing-based super austenitic fasteners manufactured to project-specific dimensions and requirements.
Overview
Super Austenitic Stainless Steel Fasteners for Highly Corrosive Environments
Super austenitic stainless steels are highly alloyed corrosion-resistant materials containing elevated levels of nickel, chromium, molybdenum and, in many grades, nitrogen and copper. This material group includes high-alloy austenitic grades such as 904L and 6Mo grades such as 254SMO and Alloy 926. Their chemistry provides significantly improved resistance to pitting, crevice corrosion, stress corrosion cracking and aggressive chemical media. 904L is widely used in sulfuric-acid and chemical service, while 254SMO and Alloy 926 provide higher molybdenum content for more demanding chloride, seawater and localized-corrosion environments.
Why Choose This Material
Why Super Austenitic Stainless Steel Is Selected for Critical Fastening Applications
Super austenitic stainless steel combines exceptional corrosion resistance, chloride performance and reliable mechanical properties for demanding industrial fastening systems.
High Pitting & Crevice Resistance
6Mo grades provide strong resistance to localized corrosion in seawater, chloride-bearing and highly contaminated environments.
Strong Chloride SCC Resistance
High nickel and molybdenum levels improve resistance to chloride-induced stress corrosion cracking compared with conventional stainless steels.
Flexible Grade Selection
904L, 254SMO and Alloy 926 provide different levels of acid resistance, chloride performance and localized-corrosion resistance.
Super Austenitic Stainless Steel Grades Available for Fasteners
904L, 254SMO and Alloy 926 provide different levels of corrosion resistance for chemical, seawater and severe chloride applications.
904L
UNS:
N08904
EN / W.Nr.:
1.4539
ASTM A182 Forging Grade:
F904L
Standards
- ASTM A276
- ASTM A479
- EN 10088-3
- ASTM A182 F904L
Characteristics
- Very high general corrosion resistance
- Good sulfuric acid resistance
- Good chloride SCC resistance
Applications
Chemical processing, Petrochemical equipment, Sulfuric acid service, Heat exchangers
254SMO / S31254
UNS:
S31254
EN / W.Nr.:
1.4547
ASTM A182 Forging Grade:
F44
Standards
- ASTM A276
- ASTM A479
- EN 10088-3
- ASTM A182 F44
Characteristics
- Excellent localized corrosion resistance
- High pitting and crevice resistance
- Excellent chloride resistance
Applications
Seawater systems, Offshore equipment, Desalination, Flue gas cleaning
Alloy 926 / N08926
UNS:
N08926
EN / W.Nr.:
1.4529
Standards
- ASTM B649
- EN 10088-3
- NACE MR0175
- ISO 15156
Characteristics
- Excellent chloride SCC resistance
- Excellent general corrosion resistance
- High pitting and crevice resistance
Applications
Chemical processing, Offshore equipment, Sulfuric acid systems, Seawater service
Other Super Austenitic Grades Available
Additional high-alloy austenitic and 6Mo grades can be reviewed according to customer drawings, project specifications and service requirements.
Chemical Composition of Super Austenitic Stainless Steel Grades
Compare the principal alloying elements of 904L, 254SMO and Alloy 926 and how they influence corrosion performance.
| GRADE | CR (%) | NI (%) | MO (%) | CU (%) | N (%) | C (%) | FE |
|---|---|---|---|---|---|---|---|
| 904L / N08904 | 19.0–23.0 | 23.0–28.0 | 4.0–5.0 | 1.0–2.0 | — | 0.02 max | Balance |
| 254SMO / S31254 | 19.5–20.5 | 17.5–18.5 | 6.0–6.5 | 0.5–1.0 | 0.18–0.22 | 0.02 max | Balance |
| Alloy 926 / N08926 | 20.0–21.0 | 24.0–26.0 | 6.0–7.0 | 0.5–1.5 | 0.15–0.25 | 0.02 max | Balance |
Reference values are provided for general comparison only. The governing material specification and batch MTC take precedence for production and acceptance.
Mechanical Performance of Super Austenitic Stainless Steel Grades
Super austenitic grades provide reliable strength and ductility while offering substantially higher corrosion resistance than conventional stainless steels.
| GRADE / CONDITION | TENSILE STRENGTH (MPA) | 0.2% YIELD STRENGTH (MPA) | ELONGATION (%) |
|---|---|---|---|
| 904L — Solution-Annealed Reference | 520–720 | 220 min | 35 min |
| 254SMO — Solution-Annealed Reference | 650–850 | 300 min | 35 min |
| Alloy 926 — Solution-Annealed Bar | 600–800 | 300 min | 40 min |
Mechanical properties depend on product form, dimensions, material condition, heat treatment and the applicable specification. The purchase specification and actual inspection certificate shall govern the order.
Super Austenitic Stainless Steel Grade Selection Guide
Choose the grade according to acid resistance, chloride severity and the required level of localized-corrosion performance.
| Application Requirement | Recommended Grade |
|---|---|
| General high-corrosion chemical service | 904L |
| Sulfuric acid service | 904L |
| Chlorinated seawater | 254SMO |
| Desalination and seawater systems | 254SMO |
| Severe pitting and crevice corrosion | 254SMO / Alloy 926 |
| Chloride-contaminated acid service | Alloy 926 |
| Offshore corrosion-resistant equipment | 254SMO / Alloy 926 |
| Higher chloride SCC resistance | Alloy 926 |
Super austenitic stainless steel fasteners Product Range
Super austenitic stainless steel fasteners are available in standard and custom configurations for chemical processing, offshore, marine, seawater and other highly corrosive industrial applications.
Super Austenitic Hex Bolts
Product Type: Hex Head Bolts / Full Thread Hex Bolts / Partial Thread Hex Bolts / Custom Hex Bolts
Size Range: Standard / Custom
Thread System: Metric / UNC / UNF
Thread Type: Coarse / Fine
Standard: ISO / DIN / ASME, as applicable, or customer drawings.
Documentation: MTC / EN 10204 3.1
Super Austenitic Heavy Hex Bolts
Product Type: Heavy Hex Bolts / Large Diameter Heavy Hex Bolts / Custom Heavy Hex Bolts
Size Range: Standard / Custom
Thread System: Metric / UNC / UNF
Thread Type: Coarse / Fine
Standard: ISO / DIN / ASME, as applicable, or customer drawings.
Documentation: MTC / EN 10204 3.1
Super Austenitic Stud Bolts
Product Type: Fully Threaded Studs / Double End Studs / Tap End Studs / Flange Stud Sets
Size Range: Standard / Custom
Thread System: Metric / UNC / UNF / 8UN
Thread Type: Coarse / Fine
Standard: ISO / DIN / ASME, as applicable, or customer drawings.
Documentation: MTC / EN 10204 3.1
Super Austenitic Nuts
Product Type: Hex Nuts / Heavy Hex Nuts / Custom Nuts
Size Range: Matched to Bolt / Stud Size
Thread System: Metric / UNC / UNF
Thread Type: Coarse / Fine
Standard: ISO / DIN / ASME, as applicable, or customer drawings.
Documentation: MTC / EN 10204 3.1
Super Austenitic Washers
Product Type: Flat Washers / Heavy Washers / Custom Washers
Size Range: Standard / Custom
Inner Diameter: Standard / Custom
Outer Diameter: Standard / Custom
Thickness: Standard / Custom
Standard: ISO / DIN / ASME, as applicable, or customer drawings.
Documentation: MTC / EN 10204 3.1 / Heat No. Traceability
Super Austenitic Socket Head Cap Screws
Product Type: Socket Head Cap Screws / Custom Socket Screws
Size Range: Standard / Custom
Thread System: Metric / UNC / UNF
Thread Type: Coarse / Fine
Standard: ISO / DIN / ASME, as applicable, or customer drawings.
Documentation: MTC / EN 10204 3.1
Super Austenitic Threaded Rods
Product Type: Fully Threaded Rods / Cut-to-Length Threaded Rods
Size Range: Standard / Custom
Thread System: Metric / UNC / UNF
Thread Type: Coarse / Fine
Standard: ISO / DIN / ASME, as applicable, or customer drawings.
Documentation: MTC / EN 10204 3.1
Custom Super Austenitic Fasteners & Machined Components
Product Type: Custom Bolts / Special Studs / Threaded Parts / Machined Components
Size Range: According to Drawing
Tolerance: According to Drawing
Manufacturing Basis: Customer Drawing / Project Specification
Inspection: Dimensional / PMI / Mechanical Testing as Required
Need a Product Type Not Shown Here?
We also manufacture custom and project-specific fasteners according to drawings, specifications or application requirements.
Process Control
Manufacturing Excellence
A controlled six-stage production workflow supports consistent manufacturing from reviewed raw material to finished, identified and export-ready specialty-alloy fasteners.
01
Raw Material Preparation
The specified alloy grade, product form, material condition and batch identity are reviewed before cutting. Stock is prepared according to the order and selected manufacturing route.
02
Cutting & Blanking
Bars, rods or forgings are cut to the required blank size while maintaining material separation and batch identification.
03
Forging / CNC Machining
Headed fasteners are forged and machined when appropriate, while complex, low-volume or drawing-based components can be produced by precision CNC machining.
04
Thread Manufacturing
Threads are rolled or cut according to material condition, product geometry, dimensional standard and customer requirements.
05
Heat Treatment
Solution treatment, annealing, age hardening or other thermal processing is applied only when required by the alloy grade, material condition and governing specification.
06
Finishing & Packing
Finished parts are deburred, cleaned and prepared as specified, then identified and packed according to order and traceability requirements.
Quality Control
Quality Assurance & Full Traceability
Inspection and documentation are planned around the purchase specification, customer drawing and intended service. The agreed inspection scope is confirmed according to individual project requirements.
Material Verification
Material grade, heat or lot number and incoming documents are checked against the agreed order requirements before production.
Heat Number Traceability
Batch identity is maintained through production, inspection and packing so finished parts can be linked to their source material.
Dimensional Inspection
Critical dimensions, tolerances and product geometry are checked against the applicable dimensional standard or customer drawing.
Thread Inspection
Thread size, pitch and fit are verified using suitable gauges and measuring equipment. Additional profile verification can be arranged when specified.
PMI & Mechanical Testing
PMI, hardness, tensile or other testing can be performed or arranged when specified, depending on the material, test method and project requirements.
MTC / EN 10204 3.1 Documentation
MTC / EN 10204 3.1 documentation, dimensional reports, PMI reports and traceability records can be supplied when specified and applicable.
Inspection methods, sampling plans, acceptance criteria and document requirements should be confirmed before order placement.
Discuss Inspection & Documentation RequirementsIndustries Served
Applications & Industries
Our specialty-alloy fasteners support demanding projects across multiple industries. Final material selection must be based on the actual temperature, corrosion medium, mechanical load, applicable standards and required service life.
Oil & Gas
Flange bolting, valves, pressure equipment, piping systems and process units exposed to pressure, temperature or corrosive media.
Chemical Processing
Reactors, heat exchangers, scrubbers, pumps and equipment handling acids, chlorides or other aggressive process media.
Power Generation
Gas and steam turbines, boilers, furnaces, heat-treatment systems and high-temperature mechanical assemblies.
Marine & Offshore
Offshore platforms, seawater systems, marine equipment and desalination installations requiring corrosion-resistant fastening.
Aerospace
Engine, thermal and precision assemblies requiring high strength, temperature capability, low weight or controlled material performance.
Nuclear & Critical Equipment
Safety-critical bolting and engineered components requiring controlled materials, documentation and reliable long-term performance.
Not every alloy is suitable for every industry or service condition. Material suitability should be confirmed against the governing specification and actual operating environment.
Discuss Your ApplicationFrequently Asked Questions
Common questions about specialty-alloy fasteners, custom manufacturing, standards, inspection, documentation and procurement.
1. What specialty-alloy fastener products can you manufacture?
Our product range includes hex bolts, heavy hex bolts, stud bolts, nuts, washers, socket head cap screws, threaded rods and drawing-based fasteners or machined components. Availability depends on material grade, dimensions and quantity.
2. Can you manufacture non-standard parts from customer drawings?
Yes. We can review drawings for custom bolts, studs, nuts, washers, threaded parts and precision machined components. The quotation is based on material, dimensions, tolerances, heat treatment, inspection requirements and order quantity.
3. Which dimensional and thread standards can you support?
Products can be manufactured to applicable ISO, DIN, ASME and other recognized dimensional standards, or to customer drawings. Metric, UNC, UNF and other thread systems can be evaluated according to the product and specification.
4. Can you provide MTC and EN 10204 3.1 documentation?
Material test certificates and EN 10204 3.1 documentation can be supplied when specified and applicable to the ordered material and product. Certificate requirements should be confirmed before order placement.
5. Is PMI or third-party inspection available?
PMI and third-party inspection can be arranged when required. The test method, sampling plan, acceptance criteria and reporting requirements should be defined before production.
6. How do you maintain material traceability?
Heat or lot identification is maintained from incoming material through production, inspection and packing, subject to the agreed order and documentation requirements.
7. Can you supply bolts, nuts and washers as matched bolting sets?
Yes. Complete bolting sets can be supplied when requested, with thread compatibility, material selection, inspection and packaging defined for the order.
8. What are your MOQ and lead time?
MOQ and lead time depend on alloy grade, raw-material availability, product size, manufacturing route, heat treatment, testing and order quantity. Made-to-order specialty-alloy fasteners normally require a technical review before confirmation.
Request for Quotation
Custom & Standard
Super Austenitic Stainless Steel Fasteners,
Direct From
Manufacturer.
Send us your Super Austenitic Stainless Steel fastener specifications, standards or drawings. Our engineering team will review your requirements and provide a detailed project-specific quotation.
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