C&N industrial Group, pipe, fitting and flanges manufacturers,fbe epoxy and pe coating for pipeline since 1991,with brand C&N huitong ,C&N hongcheng.
Product Name: ASTM A815 45° Long Radius Elbow
Standard: ASTM A815
Material Grade: Duplex Stainless Steel UNS S31803
Wall Thickness Schedule: SCH 40S
Design: 45-degree angle, long radius
Key Certifications: Compliant with NACE MR0175 / ISO 15156 for service in acidic environments
Quality Traceability: Each batch comes with a unique heat treatment batch number and a complete mill test certificate (including chemical composition and mechanical properties report)
Material Characteristics of Duplex Stainless Steel
Duplex Stainless Steel (DSS) is a highly corrosion-resistant, work-hardenable alloy with a microstructure consisting of 40–60% ferrite and 40–60% austenite (typically engineered for a near 50:50 balance to optimize performance). This dual-phase structure combines the toughness and weldability of austenitic stainless steels with the high strength and chloride stress corrosion cracking resistance of ferritic stainless steels, delivering overall performance superior to single-phase austenitic or ferritic grades.
- Corrosion Resistance: Outperforms austenitic grades like 316L in chloride-containing acidic environments (e.g., oil & gas, chemical processing media) and complies with NACE MR0175/ISO 15156 for sulfide stress cracking resistance.
- Mechanical Strength: Typically 1.5–2 times stronger than austenitic stainless steels, with better toughness than ferritic grades, making it ideal for high-pressure, high-load pipeline applications.
Chemical Composition Requirements
| Element | C | Mn | Si | P | S | Cr | Ni | Mo | N | Cu |
|---|---|---|---|---|---|---|---|---|---|---|
| Minimum | – | – | – | – | – | 21.0 | 4.5 | 2.5 | 0.08 | – |
| Maximum | 0.03 | 2.0 | 1.0 | 0.03 | 0.02 | 23.0 | 6.5 | 3.5 | 0.20 | 0.5 |
Tensile & Hardness Requirements
| Property | Minimum Requirement | Typical Value |
|---|---|---|
| 0.2% Offset Yield Strength, MPa | 450 | 550–650 |
| Tensile Strength, MPa | 620 | 750–850 |
| Elongation (50mm gauge length), % | 25 | 30–35 |
| Hardness (HBW) | – | 220–280 |
| Impact Energy (V-notch, -40°C), J | 40 | 60–100 |
C&N Group Quality Assurance System
Source Control and Material Verification: All raw materials must undergo spectroscopic analysis before entering the warehouse to ensure their chemical composition fully complies with the standards of UNS S31803. Supplier-provided material certificates are also verified to achieve traceability from the source.
Process Monitoring and Process Assurance: In key processes such as hot forming and solution heat treatment, we use automated equipment to monitor and record process parameters (such as temperature and time) in real time, ensuring that the microstructure and mechanical properties of the products consistently meet standards.
Comprehensive Finished Product Inspection and Certification:Dimensional and Visual Inspection: Every elbow is 100% inspected using precision measuring tools for angles, radii, end dimensions, and wall thickness to ensure proper fit during installation.
Non-Destructive Testing (NDT): According to standards and customer requirements, methods such as liquid penetrant testing (PT) are used to inspect product surfaces, ensuring there are no harmful defects.
Performance Verification: Hardness testing is conducted on products from each heat treatment batch, and we can provide tensile tests, impact tests, and metallographic analysis reports to formally verify product performance.
Complete Quality Document Package: Detailed quality documentation is provided with each shipment, including material certificates, heat treatment reports, NDT reports, hardness test records, and compliance certificates meeting ASTM and NACE standards, providing complete support for customer audits and acceptance.
C&N Group firmly believes that excellence begins with meticulous control of every manufacturing step. Through a rigorous quality management system, we ensure that every product leaving our factory meets the highest standards. The successful application of the ASTM A815 45° long-radius duplex stainless steel elbows is not just the delivery of a single product, but also a demonstration of C&N Group’s profound technical expertise, meticulous manufacturing philosophy, and unwavering commitment to quality.
