Table of Contents
- SS 317L Nuts Overview
- SS 317L Nuts Specifications
- What are Stainless Steel 317L Nuts?
- SS 317L Technical Properties & Composition
- Why Industries Prefer SS 317L Nuts
- Types of SS 317L Nuts
- Key Advantages of UNS S31703 Nuts
- Key Applications of SS UNS S31703 Nuts
- SS 317L Nuts vs SS 316L Nuts
- Quality Testing & Inspection
- Global Export Markets
- Frequently Asked Questions
- Contact Aurum Overseas
SS 317L Nuts Suppliers & Exporters in USA, Europe & Gulf Countries
Aurum Overseas is a trusted, precision-focused SS 317L Nuts Supplier and global SS 317L Nuts Exporter. Containing an elevated molybdenum level of 3.00% to 4.00% alongside high chromium content, Type 317L fasteners represent a superior step up from standard 316L alloys. They provide outstanding resistance to severe chemical attack, aggressive chloride pitting, sulfurous media, and crevice corrosion.
Engineered strictly under standards such as ASTM A194 Grade 8M / 8MA and ASTM F593, these low-carbon fasteners ensure maximum weldability and resistance to intergranular precipitation. As an established international SS 317L Nuts Exporter, Aurum Overseas supplies fully certified, precision-threaded fasteners to chemical processors, paper pulp mills, and pollution control facilities across the USA, Germany, UAE, Saudi Arabia, Qatar, Europe, and the Middle East.
SS 317L Nuts Specifications
| Parameter | Specification / Technical Range |
|---|---|
| Material Grade | SS 317L (Low Carbon High-Moly Stainless Steel) |
| UNS Number | UNS S31703 |
| Werkstoff Number | 1.4438 |
| Manufacturing Standards | ASTM A194 Grade 8M / 8MA, ASTM F593, ASME B18.2.2, DIN 934, ISO 4032 |
| Size Range | M3 to M56 (Metric) | 3/8" to 2.5" (Imperial) | Custom thread options up to 4" |
| Thread Configuration | ASME B1.1 2A/3A - 2B/3B Unified (UNC, UNF, UNEF) & B1.13M 6h-6G Metric Coarse/Fine |
| Special Fastener Formats | SS 317L Hex Head Nuts, SS 317L Square Nuts, SS 317L T Nuts, SS 317L Eye Nuts |
| Surface Finishes | Bright Polished, Passivated, Solution Annealed, Electro-polished, PTFE Coated |
| Certifications | EN 10204 3.1 Material Test Certificate, NACE MR0175 / ISO 15156 Compliant |
What are Stainless Steel 317L Nuts?
Type 317L (UNS S31703 / 1.4438) is a low-carbon, high-molybdenum austenitic stainless steel engineered for severe chemical environments that exceed the limits of standard 316L. Featuring 3.0% to 4.0% molybdenum, these fasteners deliver superior resistance to chloride pitting, crevice corrosion, and acidic media in demanding industrial applications.
SS 317L Technical Properties & Composition
The chemical composition and mechanical properties of SS 317L are precisely calibrated to deliver maximum pitting resistance, intergranular corrosion immunity, and reliable thread integrity across demanding chemical service environments.
Chemical Composition of UNS S31703 Nuts (%)
| Element | SS 317L Range (%) |
|---|---|
| Carbon (C) | 0.035 max |
| Manganese (Mn) | 2.0 max |
| Silicon (Si) | 1.0 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Chromium (Cr) | 18.00 – 20.00 |
| Molybdenum (Mo) | 3.00 – 4.00 |
| Nickel (Ni) | 11.00 – 15.00 |
| Iron (Fe) | 57.89 min |
Mechanical Properties of SS 317L Nuts
| Technical Parameter | Value |
|---|---|
| Density | 7.9 g/cm³ |
| Melting Point | 1400 °C (2550 °F) |
| Tensile Strength | 515 MPa / 75,000 Psi min |
| Yield Strength (0.2% Offset) | 205 MPa / 30,000 Psi min |
| Elongation | 35 % |
Equivalent Grades for SS 317L Nuts
| Standard | WERKSTOFF NR. | UNS | JIS | EN |
|---|---|---|---|---|
| SS 317L | 1.4438 | S31703 | SUS 317L | X2CrNiMo18-15-4 |
Why Industries Prefer SS 317L Nuts
Engineers specify UNS S31703 Nuts when equipment operates in aggressive chemical environments where 304 and 316 grades suffer rapid pitting or stress cracking. The key driver is the higher molybdenum and chromium content, which shifts the alloy's Critical Pitting Temperature (CPT) and Critical Crevice Corrosion Temperature (CCT) higher.
When sourcing from a qualified SS 317L Nuts Supplier, plant operators ensure long service life in acidic environments—such as hot organic acids, dilute sulfuric solutions, and chlorine bleaching systems. The low carbon content also allows for field-welded installations without requiring post-weld solution annealing.
Types of SS 317L Nuts
Aurum Overseas supplies a comprehensive range of stainless steel nut configurations manufactured according to standard DIN, ASME, and ISO dimensional tolerances for multiple engineering assemblies.
SS 317L Hex Head Nuts
SS 317L Square Nuts
SS 317L Lock Nuts
SS 317L Eye Nuts
SS 317L Wing Nuts
SS 317L T Nuts
SS 317L Panel Nuts
SS 317L Coupling Nuts
SS 317L Dome Nuts
Key Advantages of UNS S31703 Nuts
Exceptional Pitting Resistance
The 3–4% molybdenum addition offers an elevated Pitting Resistance Equivalent Number (PREN ≥ 29), ensuring resistance against halide and chloride attack.
Superior Sulfuric & Organic Acid Protection
Outperforms standard 316L in handling hot solutions of acetic, formic, citric, and tartaric acids as well as dilute sulfuric acid concentrations.
Intergranular Decay Immunity
Low carbon chemistry prevents intercrystalline corrosion along heat-affected zones during heavy assembly welding.
Crevice Corrosion Prevention
Maintains thread integrity and avoids crevice attack under gaskets, washers, and restricted joint faces in wet chemical systems.
Non-Magnetic Nature
Retains an austenitic structure with very low magnetic permeability in fully annealed supply conditions.
Key Applications of SS UNS S31703 Nuts
Our stainless steel 317L nuts are deployed globally in chemical processing plants, pollution control systems, and aggressive acid handling infrastructure worldwide.
| Industry Sector | Primary Fastener Application |
|---|---|
| Flue Gas Desulfurization (FGD) | Scrubber system bolting, stack liners, and wet acid gas ductwork clamping |
| Pulp & Paper Processing | Bleaching plant chlorination towers, digesters, and liquor recovery systems |
| Chemical & Petrochemical | Condensers, heat exchangers, and vessel flanges handling organic and inorganic acids |
| Textile & Dyeing Equipment | High-temperature dye vat fastenings exposed to corrosive bleaching reagents |
| Marine & Off-Shore Scrubbers | Exhaust gas cleaning systems (EGCS) installed on marine vessels |
SS 317L Nuts vs SS 316L Nuts
When selecting the ideal stainless fastener grade for your assembly, understanding the material and performance differentials between SS 317L and SS 316L is crucial.
| Comparison Factor | SS 317L Nuts (UNS S31703) | SS 316L Nuts (UNS S31603) |
|---|---|---|
| Molybdenum Concentration | 3.00% – 4.00% Mo | 2.00% – 3.00% Mo |
| Chromium / Nickel Content | 18.00–20.00% Cr / 11.00–15.00% Ni | 16.00–18.00% Cr / 10.00–14.00% Ni |
| Pitting Resistance (PREN) | Higher PREN (~29–30) | Standard PREN (~23–25) |
| Acid Corrosion Resistance | Excellent in sulfurous, acetic, & dilute sulfuric acid | Good in general organic acids & mild chlorides |
| Severe Chemical Suitability | Preferred for pulp bleach plants & FGD scrubbers | Standard choice for marine & light chemical piping |
| Detailed Specifications | Current Page | View SS 316L Nuts Specs → |
Quality Testing & Inspection
Aurum Overseas implements rigorous quality assurance practices to guarantee every shipment supplied by our team as an SS 317L Nuts Supplier meets project technical requirements.
| Test / Inspection Standard | Technical Verification Scope |
|---|---|
| Positive Material Identification (PMI) | Spectroscopic alloy verification confirming Mo (3-4%), Ni, Cr, and Fe levels |
| Dimensional & Thread Gaging | Thread pitch, concentricity, and lead verification per ASME B18.2.2 and DIN standards |
| Proof Load & Tensile Testing | Mechanical verification of strain-hardened and standard strength properties |
| Intergranular Corrosion (IGC) | Testing per ASTM A262 Practice E to verify resistance to intercrystalline attack |
| Certified Mill Traceability | EN 10204 3.1 Certification accompanying all heat-treated manufacturing lots |
Global Export Markets
As a globally recognized SS 317L Nuts Exporter, Aurum Overseas ships fully tested, seaworthy-packaged high-molybdenum fasteners to industrial buyers worldwide.
USA
Canada
Mexico
Germany
United Kingdom
France
Italy
Netherlands
Belgium
Spain
Poland
UAE
Saudi Arabia
Qatar
Kuwait
Oman
Bahrain
Frequently Asked Questions
SS 317L contains 3% to 4% molybdenum compared to 2% to 3% in 316L. This elevated alloy content offers greater resistance to pitting, crevice corrosion, and acid attack in harsh chemical and paper bleaching processes.
Common manufacturing specifications include ASTM A194 Grade 8M/8MA, ASTM F593, ASME B18.2.2 for imperial sizes, and DIN 934 / ISO 4032 for metric sizes.
Yes, SS 317L maintains excellent creep strength and elevated temperature performance while resisting oxidation up to 800°C (1470°F).
Aurum Overseas manufactures and exports standard SS 317L Hex Head Nuts along with specialty configurations such as SS 317L Square Nuts, SS 317L T Nuts, and forged SS 317L Eye Nuts.
Yes, Aurum Overseas regularly exports certified SS 321 and 321H fasteners to major energy hubs across the USA, European markets (Germany, UK, France, Netherlands), and Gulf GCC nations (UAE, Saudi Arabia, Qatar, Oman, Kuwait, Bahrain).
We offer expedited air freight and scheduled sea freight shipping options to North America and European ports, ensuring secure export-grade palletized packaging for safe transit.
Contact Aurum Overseas
Aurum Overseas provides rapid quoting, complete documentation, and reliable export logistics for all your stainless steel fastener demands.
Contact our sales team to request a quote or confirm specification compliance.