:HL["/uploads/sites/1/images/ss-321-hex-bolts-6.jpg","image"] :HL["/uploads/sites/1/images/s31803-super-duplex-steel-pipe-fittings-3.png","image"] :HL["/uploads/sites/1/images/91a78052-4a28-454e-8ca7-bc6fbae2e788.webp","image"] :HL["/uploads/sites/1/images/26e93665-33e9-4ea9-a273-8504a46a28ae.webp","image"] :HL["/uploads/sites/1/images/470a8335-698e-49c2-aa62-c0c74e0b1bc8.webp","image"] 45:T1447,

Our Duplex Stainless Steel Bolts deliver double the strength of 316 SS while resisting chloride attacks. With 22% chromium, 5% nickel, and 3% molybdenum (per ASTM A276), they achieve PREN values >35 - proven to withstand 100,000+ ppm chlorides in ASTM G48 testing.

Cold-forged heads provide 750 MPa tensile strength (exceeding ASME SA320 L43 requirements), perfect for offshore platforms where salt spray kills standard bolts. Third-party reports show <0.01mm/year pitting in seawater at 30°C. You'll get 2x the lifespan of 316 fasteners in chemical processing plants while saving 25% versus super duplex options.

We offer two finishes: passivated (per ASTM A967) to boost corrosion resistance, creating a 7-9μm oxide layer, and sandblasted (Ra 25-50μm) for better paint adhesion in outdoor projects. The passivation process removes free iron, making them 35% more resistant to chloride corrosion than untreated bolts.

As a Chinese manufacturer with 10 years supplying EU offshore and chemical industries, we run 5 duplex-specific cold heading lines and 7 thread rollers, producing 3,800 tons annually. Our raw material undergoes a special annealing process to maintain the 50-50 ferrite/austenite balance, checked via our in-house magnetic tester (accuracy ±1%).

We keep 220-350 tons in stock at our Qingdao warehouse, covering sizes from ¼" to 2" and lengths 1" to 20". Inventory updates in real time on our website, and FOB Qingdao shipments for in-stock bolts leave within 5 days-handy when your customers need to keep projects on schedule.

Orders over 45 tons get a 5.5% discount, plus free passivation and 15% of sea freight.

Here's our guarantee: If any Duplex Stainless Steel Bolts fail to meet ASTM A193 mechanical standards or show pitting corrosion within 8 years, we'll replace them within 6 days and refund all shipping costs. We also offer a 35-day price lock on confirmed orders, with a 2% repeat order discount for clients who reorder within 3 months.

Super Duplex Stainless Steel S31803 (UNS S31803; equivalent to 2205, DIN 1.4462)

Chemical Composition

Cr: 21.0-23.0%, Ni: 4.5-6.5%, Mo: 2.5-3.5%, N: 0.08-0.20%, C: ≤0.03%, Mn: ≤2.0%, Si: ≤1.0%, P: ≤0.03%, S: ≤0.02%

Mechanical Properties

Tensile Strength: ≥690 MPa

Yield Strength: ≥450 MPa

Hardness: ≤290 HB (Brinell); ≤31 HRC (Rockwell)

Elongation: ≥25%

Corrosion Resistance

Excellent resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC) in chloride-rich environments (e.g., seawater, brines). Superior to 316/316Ti in harsh chemicals.

Temperature Range

Continuous service: -50°C to 250°C (limited by ductility at high temperatures); ideal for subsea and offshore environments.

Magnetic Property

Magnetic (due to duplex microstructure: austenite + ferrite)

Metric Size (M)

Thread Pitch (mm)

Hex Head Width (mm)

Hex Head Height (mm)

Length Range (mm)

Imperial Equivalent

Thread Type (Imperial)

UNC (3/16"-24), UNF (3/16"-32)

UNC (5/16"-18), UNF (5/16"-24)

UNC (3/8"-16), UNF (3/8"-24)

UNC (1/2"-13), UNF (1/2"-20)

UNC (5/8"-11), UNF (5/8"-18)

Standard Compliance

Key Applications

ASTM A193 B8S, ISO 4017, DIN 933

Offshore oil and gas platforms (subsea pipelines, wellheads)

Desalination plants (reverse osmosis systems)

Chemical processing (acids, chlorides, and corrosive slurries)

Marine engineering (ship hulls, propeller shafts)

Pulp and paper industry (bleaching systems with chlorine compounds)

S31803 (2205)

High (yield strength 2× that of 316Ti)

Chloride Resistance

Excellent (resists seawater/SCC)

Good (but limited in high chloride levels)

Weldability

Good (requires controlled heat input to avoid ferrite/austenite imbalance)

Higher (premium for duplex microstructure)

Frequently Asked Questions

Q: What is your policy for product returns or replacements?

A: If products have quality issues caused by us, we'll arrange replacements or refunds within 30 days of receipt.

Q: Can you provide a certificate of origin (CO) for customs clearance?

A: Yes, we can provide CO, as well as other documents like commercial invoices and packing lists required for customs.

Q: How can we track the shipment after it's dispatched?

A: We'll provide a tracking number and logistics platform information once the shipment departs, so you can check the status in real time.

Q: Do you offer technical support for product installation or usage?

A: Yes, our technical team can provide installation guides, video tutorials, or even on-site support if needed.

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Our duplex steel threaded rods conform to ASTM A193 and utilize 2205 duplex material. This results in a tensile strength of 700-850 MPa, significantly higher than ordinary stainless steel rods, and are extremely resistant to rust in saline or chemical environments.

We offer two surface treatments: pickling (per ASTM A380) for improved corrosion resistance, and oiling (light mineral oil) to protect the threads during storage. The pickling process removes mill scale produced during manufacturing.

Our threads are precision-machined: UNC threads (ASME B1.1). We can cut the rod to custom lengths (1 to 6 meters) using high-speed saws to ensure smooth rod ends. Each rod is thread gauge checked (per ASME B1.1) before shipment to ensure the correct thread size.

As a Chinese manufacturer with experience serving European and American industrial customers, we have dedicated threading lines and heat treatment furnaces, with an annual production capacity of 3,000 tons. Our raw materials undergo a special annealing process to achieve a perfect 50-50 ferrite/austenite ratio and are inspected in-house using magnetic particle detectors.

Our warehouse holds 600-800 tons of inventory, covering diameters from 1/4 inch to 2 inches in standard lengths of 3 and 6 meters. Our website updates inventory twice daily, and bar shipments from stock can be shipped within 5 days.

Orders over 40 tons get a 5% discount, free processing service.

Here's our guarantee: If any Duplex Steel Threaded Rod fails to meet ASTM A193 strength standards or shows significant corrosion (more than 0.01mm/year) in standard tests within 3 years, we'll replace it within 7 days and cover all shipping costs. We also lock prices for 40 days on confirmed orders, so you don't have to worry about sudden price jumps affecting your margins.

Duplex Stainless Steel S31803 (UNS S31803; equivalent to 2205, DIN 1.4462)

Chemical Composition

Cr: 21.0-23.0%, Ni: 4.5-6.5%, Mo: 2.5-3.5%, N: 0.14-0.20%, C: ≤0.03%, Mn: ≤2.0%, Si: ≤1.0%, P: ≤0.03%, S: ≤0.02%

Mechanical Properties

Tensile Strength: 700-850 MPa

Yield Strength: ≥450 MPa

Hardness: ≤290 HB (Brinell); ≤31 HRC

Elongation: ≥25%

Corrosion Resistance

Superior resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC) in chloride-rich environments (e.g., seawater, brines). Outperforms 316 in harsh chemical and marine settings.

Temperature Range

Service temp: -50°C to 250°C (optimal for subsea/offshore; limited high-temp ductility).

Magnetic Property

Magnetic (duplex microstructure: 50-60% ferrite + 40-50% austenite).

Metric Size (M)

Thread Pitch (mm)

Thread Type

Length Range (mm)

Imperial Equivalent

Imperial Thread Type

Length Range (inches)

Metric Coarse (ISO)

UNC (3/16"-24)

Metric Coarse (ISO)

UNC (5/16"-18)

Metric Coarse (ISO)

UNC (3/8"-16)

Metric Coarse (ISO)

UNC (1/2"-13)

Metric Coarse (ISO)

UNC (5/8"-11)

Metric Coarse (ISO)

UNC (3/4"-10)

Compliance Standards

Key Applications

ASTM A193 B8S, ASME SA193, ISO 898-1, DIN 975

Offshore oil/gas: subsea pipelines, wellhead equipment, risers

Marine: shipbuilding, seawater systems, propeller shafts

Desalination: reverse osmosis (RO) plants, brine handling

Chemical processing: chloride-based solvents, acid reactors

Pulp/paper: bleaching lines (chlorine dioxide environments)

S31803 (2205) Threaded Rods

316 Stainless Steel Rods

Carbon Steel Rods (Zinc-Plated)

High yield strength (450+ MPa) – ideal for high-load, high-pressure joints.

Moderate (yield ~205 MPa) – suitable for low-stress uses.

High tensile but poor corrosion resistance.

Corrosion Resistance

Excellent in seawater/chlorides – no coating needed.

Good in mild chemicals but limited in high chlorides.

Requires coating; prone to rust in moist environments.

Premium (due to alloy content).

Lowest, but higher lifecycle costs in harsh environments.

20+ years in offshore/marine settings.

10-15 years in similar environments

Frequently Asked Questions

Q: What payment terms do you support?

A: We support T/T, L/C, and Western Union. For regular customers, we can also discuss more flexible terms.

Q: Do you have stock for standard-sized products?

A: Yes, we keep stock for most standard-sized pipes, flanges, and fittings to ensure quick delivery.

Q: How do you ensure the accuracy of product specifications?

A: Each product is inspected by our QC team using precision instruments, and we provide MTC (Material Test Certificate) to confirm specifications.

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Our super duplex steel threaded rod conforms to ASTM A193 and is made from S32750 super duplex alloy. significantly higher than ordinary duplex steel rod, and provides excellent resistance to pitting corrosion in harsh environments.

We offer two surface finishes: passivation (per ASTM A967) and sandblasting to improve paint adhesion in outdoor environments.

Our threads are precision-machined: UNC threads, ensuring a tight fit with the nut. We can cut the rods to custom lengths (1 to 6 meters) using a cold cutter that doesn't weaken the material. Each rod is thread gauge checked and hardness tested before shipment.

As a Chinese manufacturer with experience supplying the EU and US marine industries, our raw materials undergo vacuum degassing to maintain low impurity levels and are tested in-house using an optical emission spectrometer (OES).

Our warehouse inventory holds 500-600 tons of bar stock, covering diameters from ¼ inch to 2.5 inches in standard lengths of 3 and 6 meters. With constantly updated inventory information, bar stock can be shipped within 5 days-critical for meeting your customers' tight project deadlines.

Orders over 60 tons receive a 6% discount, plus free passivation and 25% off ocean freight.

Our guarantee: If any Super Duplex steel threaded rod fails to meet ASTM A193 strength standards, we will replace it within 6 days and cover all shipping costs. We also lock in pricing on confirmed orders for 45 days, protecting you from sudden market price increases.

Frequently Asked Questions

Q: How long does it take to produce a custom order with special specifications?

A: It usually takes 25-30 days, depending on the complexity of the design. We'll confirm the exact lead time after evaluating your requirements.

Q: Can you provide a detailed product catalog?

A: Sure, we'll send you a digital catalog with specifications, prices, and photos via email. Just let us know your specific needs.

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Our Super Duplex bolts (Grade S32750) offer exceptional performance in harsh environments. They resist chloride-induced stress corrosion cracking up to three times better than standard 316 stainless steel. A nitrogen-enhanced formula achieves a tensile strength of 1000 MPa. Independent testing (ASTM G48) confirms zero pitting corrosion.

Each batch is precision cold-forged and strain-hardened to ensure consistent thread strength. We offer two key surface finishes:

Passivation (per ASTM A967)

Electrolytic polishing minimizes friction during installation while improving chloride resistance.

Magnetic particle inspection (per ASTM E709) detects surface defects before shipment.

Our Henan factory features an automated cold-forming line with an annual production capacity of 800 million duplex fasteners. Real-time process control ensures:

Hardness consistency: 30-35 HRC across all batches

Zero σ phase: Intermetallic content <0.5%

Full traceability: Laser-marked heat number and material certificate

We have over 2,000 pallets for M12-M64 bolts and guarantee shipping within 48 hours for standard orders.

Order 5+ tons and get:

Free salt-spray testing reports (ISO 9227) with your shipment

Dedicated technical support for installation torque calculations

Performance guarantee: If any bolt shows corrosion below PREN 40 value in chloride service, we'll replace the entire batch + cover lab analysis costs.

Plus: Container-load orders receive 6-month corrosion warranty extension.

Super Duplex Stainless Steel S32750 (UNS S32750; equivalent to 2507, DIN 1.4410)

Chemical Composition

Cr: 24.0-26.0%, Ni: 6.0-8.0%, Mo: 3.0-5.0%, N: 0.24-0.32%, C: ≤0.03%, Mn: ≤1.0%, Si: ≤0.8%, P: ≤0.03%, S: ≤0.02%, Cu: ≤0.5%

Mechanical Properties

Tensile Strength: ≥800 MPa

Yield Strength: ≥550 MPa

Hardness: ≤310 HB (Brinell); ≤32 HRC

Elongation: ≥15%

Corrosion Resistance

Exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC) in extreme chloride environments (e.g., high-salinity seawater, acidic brines). Pitting Resistance Equivalent (PREN) ≥40 (superior to 2205 and 316).

Temperature Range

Service temperature: -50°C to 300°C (suitable for high-pressure, high-chloride industrial and offshore applications).

Magnetic Property

Magnetic (duplex microstructure: ~50% ferrite + ~50% austenite)

Thread Type

Full Threaded (continuous threading along the entire length)

Thread Standards

Metric Coarse (ISO), UNC (Unified National Coarse), UNF (Unified National Fine)

Metric Sizes (M)

M8 to M64 (common: M10, M12, M16, M20, M24, M30)

Imperial Sizes

3/8" to 2-1/2" (common: 1/2", 5/8", 3/4", 1", 1-1/4")

Length Range

50 mm to 6000 mm (metric); 2" to 240" (imperial)

Standards Compliance

ASTM A193 B8S Class 2, ASME SA193, ISO 898-6, DIN 976

Key Applications

Offshore oil/gas: subsea manifolds, wellhead connectors, riser systems

Chemical processing: high-pressure reactors, chloride-based solvent lines

Desalination: high-salinity brine handling

Marine: offshore platforms, seawater cooling systems

Surface Finish

Pickled, passivated, or polished (to enhance corrosion resistance and reduce contamination risk)

Frequently Asked Questions

Q: What is the minimum order quantity (MOQ) for custom products?

A: The MOQ for custom products depends on specifications, but generally starts from 1 pieces. For special cases, we can discuss further.

Q: Can you print our company logo on the products?

A: Yes, we can print your logo via laser engraving or stamping, as long as you provide the design file.

Q: Do you accept small quantity orders?

A: Yes, we accept small quantity orders. Even for trial orders, we'll provide the same quality and service as bulk orders.

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