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Duplex Stainless Steel D6-70 (2205, ASTM S32205, 1.4462): Superior Material for High-Performance Fasteners
Jul 03, 2025
Duplex Stainless Steel D6-70 (2205, ASTM S32205, 1.4462) is a premium-grade austenitic-ferritic stainless steel that combines exceptional strength, corrosion resistance, and cost efficiency. Widely used in oil & gas, marine, chemical processing, and offshore engineering, this alloy is ideal for manufacturing high-performance fasteners that endure extreme environments.
At JM Hardware®, we specialize in producing precision-engineered fasteners from Duplex Stainless Steel D6-70, ensuring superior durability and reliability. This article explores the mechanical properties, chemical composition, and key advantages of this material, along with our manufacturing expertise.
Material Overview: Duplex Stainless Steel D6-70 (2205, ASTM S32205, 1.4462)
1. Chemical Composition
The Duplex Stainless Steel D6-70 alloy consists of a balanced microstructure of 50% austenite and 50% ferrite, offering the best of both phases. Its chemical composition includes:
| Element | Composition (%) | Role in Performance |
|---|---|---|
| Chromium (Cr) | 22.0 - 23.0 | Enhances corrosion & oxidation resistance |
| Nickel (Ni) | 4.5 - 6.5 | Stabilizes austenitic phase, improves toughness |
| Molybdenum (Mo) | 3.0 - 3.5 | Boosts pitting & crevice corrosion resistance |
| Nitrogen (N) | 0.14 - 0.20 | Increases strength & delays sigma phase formation |
| Manganese (Mn) | ≤ 2.0 | Aids hot workability |
| Carbon (C) | ≤ 0.03 | Reduces intergranular corrosion risk |
| Iron (Fe) | Balance | Forms the base matrix |
This optimized composition ensures Duplex Stainless Steel D6-70 outperforms standard 300-series stainless steels (e.g., 304, 316) in harsh chloride-rich environments36.
Material Verification : Duplex Stainless Steel D6-70 Carriage Bolt Chemistry Analysis
Mechanical Properties of Duplex Stainless Steel D6-70
| Property | Value | Advantage Over Standard Stainless Steel |
|---|---|---|
| Tensile Strength | 620-750 MPa | ~2x stronger than 316L |
| Yield Strength | 450-550 MPa | Higher load-bearing capacity |
| Elongation (A%) | ≥ 25% | Good ductility for forming |
| Hardness (HB) | 290 max | Balanced machinability & wear resistance |
| Impact Toughness (Charpy V-notch) | ≥ 100J at -46°C | Excellent low-temperature performance |
| Pitting Resistance Equivalent (PRE) | ≥ 35 | Superior to 316L (PRE ~26) |
Key Benefits:
✔ Higher strength-to-weight ratio (allows downsizing components)
✔ Excellent fatigue & stress corrosion cracking (SCC) resistance
✔ Performs in temperatures from -50°C to +300°C
Why Choose JM Hardware® for Duplex Stainless Steel D6-70 Fasteners?
1. Advanced Manufacturing Expertise
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Cold forging & precision machining to maintain phase balance
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Strict heat treatment control to prevent sigma phase embrittlement1
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100% material traceability (mill certificates & PMI testing)
2. Corrosion-Resistant Fastener Solutions
Our Duplex Stainless Steel D6-70 fasteners excel in:
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Offshore platforms (seawater resistance)
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Oil & gas pipelines (H₂S & CO₂ corrosion resistance)
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Chemical reactors (acid & chloride resistance)
3. Customization & Compliance
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Threading standards: DIN 976, ASTM F594, ISO 3506
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Coatings: Xylan®, PTFE, or passivation for extra protection
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Certifications: NACE MR0175, DNV-GL, PED 2014/68/EU
4. Competitive Edge Over Competitors
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Faster lead times due to in-house production
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Cost savings via optimized material usage
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Technical support from design to installation
Applications of Duplex Stainless Steel D6-70 Fasteners
✅ Oil & Gas Industry
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Subsea bolts & wellhead components
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Flange connections in sour service
✅ Marine & Offshore
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Shipbuilding fasteners
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Desalination plant fittings
✅ Chemical Processing
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Pump shafts & valve stems
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Heat exchanger tie-rods
✅ Renewable Energy
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Wind turbine foundation bolts
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Hydrogen storage systems
The Best Choice for Demanding Environments
Duplex Stainless Steel D6-70 (2205, ASTM S32205, 1.4462) is the optimal material for high-strength, corrosion-resistant fasteners in extreme conditions. At JM Hardware®, we combine material expertise, precision manufacturing, and rigorous testing to deliver superior fastening solutions.
📩 Contact Us for a Quote!
✉ Email: jminfo@jm-industry.com
🌐 Whatsapp: +8613681923533
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