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Super Austenitic Stainless Steel Pipe Alloy 926 / EN 1.4529 Seamless Pipe ERW Welded Pipes
| Herkunftsort | China |
|---|---|
| Markenname | DELTA |
| Zertifizierung | ISO |
| Modellnummer | 926 / 1.4529 |
| Min Bestellmenge | 1000 kg |
| Preis | 20 - 30 USD/Kg |
| Verpackung Informationen | Standardverpackung für den Exportieren |
| Lieferzeit | 5 - 12 Tage basierend auf der Menge |
| Zahlungsbedingungen | L/C, T/T, Western Union |
| Versorgungsmaterial-Fähigkeit | 4 Tonnen pro Woche |
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xProduktdetails
| Produkte | Nahtloses rostfreies Stahl | Grad | 926 / 1.4529 |
|---|---|---|---|
| Durchmesser | DN10 - DN400 | Länge | 6 m oder kundenspezifisches Schneiden als Anfrage |
| Standard | ASTM EN | Service | Schneiden |
| Ladeanschluss | Shanghai Hafen | Dicke | 4.0 - 50,0 mm |
Produkt-Beschreibung
Super Austenitic Stainless Steel Pipe Alloy 926 / EN 1.4529 Seamless Pipe ERW Welded Pipes
Products Specification
| Products Name | Stainless Steel Seamless Pipe |
Grade: |
304 304L 304LN 304H 309S 310S 314 315 316L 316Ti 317L 321 329 347H 410 2205 2507 2550 S32760 904L 254SMO 926 C276 400 600 625 and equal grade in GB JIS EN DIN Standard |
| Standards: | ASTM A213M-94b ASTM A249M-94a ASTM A269-94a ASTM A312M-94b,ect. ASTM A790 |
| DIN 17456-85 DIN 17458-85 DIN 17459-92.ect | |
| JIS G3446-1994 JIS G3448-1997 JIS G3459-1997 JIS G3463-1994,ect. | |
| GB13296-1991 GB14975-2002 GB14976-2002,ect. | |
| Size: | ND5 - DN400 |
| Length: | 6m length or cutting any length as request |
| Applications: | fluid and gas transport, structure , boiler, heat exchanger, super heater |
Alloy 926 (also designated as EN 1.4529) is a premium super austenitic stainless steel alloy, engineered to deliver exceptional corrosion resistance, mechanical strength, and thermal stability—making it a preferred choice for demanding industrial piping systems. It is commonly manufactured as seamless pipes (for high-pressure applications) and ERW (Electric Resistance Welded) pipes (for cost-effective, medium-pressure scenarios), catering to diverse operational needs across sectors. Below is a detailed overview of its key parameters, performance, standards, similar grades, and applications.
1. Chemical Composition (Key Parameters)
The superior performance of Alloy 926 / EN 1.4529 stems from its precisely balanced chemical composition, optimized for corrosion resistance (especially against chloride-induced stress corrosion cracking, Cl-SCC) and mechanical integrity. The typical composition (per EN 10088-1 and ASTM A789 standards) is as follows:
| Element | Content Range (%) | Function |
|---|---|---|
| Carbon (C) | ≤ 0.02 | Minimizes carbide precipitation (avoids intergranular corrosion) |
| Chromium (Cr) | 20.0 – 22.0 | Enhances general corrosion resistance (forms a passive oxide layer) |
| Nickel (Ni) | 24.0 – 26.0 | Stabilizes the austenitic structure; improves ductility and Cl-SCC resistance |
| Molybdenum (Mo) | 6.0 – 7.0 | Boosts resistance to pitting, crevice corrosion, and reducing acids |
| Nitrogen (N) | 0.15 – 0.25 | Strengthens the alloy (without sacrificing ductility) and enhances pitting resistance |
| Iron (Fe) | Balance | Base metal for structural stability |
| Manganese (Mn) | ≤ 2.0 | Aids in austenite formation; controls sulfur-induced brittleness |
| Silicon (Si) | ≤ 0.7 | Improves casting/welding performance; acts as a deoxidizer |
| Phosphorus (P) | ≤ 0.03 | Minimized to avoid brittleness and corrosion vulnerabilities |
| Sulfur (S) | ≤ 0.01 | Strictly limited to prevent hot cracking during welding |
2. Mechanical Properties
Alloy 926 / EN 1.4529 exhibits excellent mechanical strength at both ambient and elevated temperatures, along with high ductility—critical for piping systems subject to pressure, vibration, or thermal cycling. Typical properties (for seamless pipes, annealed condition) are:
| Property | Value (Annealed) | Test Standard |
|---|---|---|
| Tensile Strength (σb) | ≥ 650 MPa | EN ISO 6892-1 / ASTM E8 |
| Yield Strength (σ0.2) | ≥ 310 MPa | EN ISO 6892-1 / ASTM E8 |
| Elongation at Break (δ) | ≥ 35% (in 50mm gauge) | EN ISO 6892-1 / ASTM E8 |
| Hardness (Brinell, HBW) | ≤ 250 | EN ISO 6506-1 / ASTM E10 |
| Impact Toughness (Charpy V-notch) | ≥ 100 J at -196°C | EN ISO 148-1 / ASTM A370 |
Key Advantage: Retains >80% of its room-temperature strength at 400°C (752°F), making it suitable for high-temperature process piping.
3. Corrosion Resistance Performance
As a super austenitic alloy, Alloy 926 / EN 1.4529 outperforms conventional austenitic steels (e.g., 316L) in aggressive environments, particularly those containing chlorides, acids, or salts. Its corrosion resistance is quantified by two critical metrics:
- Pitting Resistance Equivalent Number (PREN): ~45 (calculated as PREN = %Cr + 3.3×%Mo + 16×%N). A PREN >40 indicates excellent resistance to pitting/crevice corrosion (e.g., in seawater or brines).
- Critical Pitting Temperature (CPT): ≥ 40°C (104°F) in 6% FeCl₃ solution (per ASTM G48 Method A), far higher than 316L’s CPT (~10°C).
Resistant to:
- Chloride-induced stress corrosion cracking (Cl-SCC) in seawater, brines, or chemical process streams.
- General corrosion in dilute acids (e.g., sulfuric acid, phosphoric acid) and alkaline solutions.
- Crevice corrosion in stagnant or low-flow areas (e.g., pipe fittings, flanges).
Limitations: Not recommended for concentrated nitric acid (>65%) or high-temperature hydrofluoric acid (HF), where more specialized alloys (e.g., Hastelloy C276) are required.
4. Manufacturing Forms & Standards
Alloy 926 / EN 1.4529 pipes are produced in two primary forms to suit different application requirements, with compliance to global standards ensuring quality and interchangeability:
Pipe Types
- Seamless Pipes: Manufactured via extrusion or piercing (no welds), offering superior pressure integrity for high-pressure/high-temperature applications (e.g., oil & gas wellheads, chemical reactors).
- ERW Welded Pipes: Formed by rolling metal strips and welding the seam via electric resistance (no filler metal), ideal for medium-pressure systems (e.g., water treatment, marine piping) where cost efficiency is prioritized.
Key Standards
| Standard Organization | Standard Number | Scope |
|---|---|---|
| European (EN) | EN 10216-5 | Seamless stainless steel pipes for pressure purposes |
| EN | EN 10217-7 | Welded stainless steel pipes for pressure purposes |
| American (ASTM) | ASTM A789 | Seamless & welded stainless steel tubes for general service |
| ASTM | ASTM A928 | Seamless & welded super austenitic stainless steel tubes |
| International (ISO) | ISO 1127 | Stainless steel pipes (general specifications) |
5. Similar Grades (Alternative Alloys)
Alloy 926 / EN 1.4529 belongs to a family of super austenitic stainless steels with comparable properties. These grades are often interchangeable in non-specialized applications, though minor compositional differences may affect performance in extreme environments:
| Grade Designation | Standard | Key Difference from Alloy 926 / EN 1.4529 |
|---|---|---|
| Alloy 254 SMO® | EN 1.4547 / ASTM A789 | Lower Ni (17-19%), higher Mo (6.5-7.5%); similar PREN (~43) |
| AL-6XN® | ASTM B637 | Higher N (0.20-0.30%), slightly lower Mo (5.0-6.0%); higher tensile strength |
| 20Mo-6 | ASTM A789 | Identical composition to Alloy 926 (often considered a "trade name" variant) |
| Alloy 825 | EN 1.4876 / ASTM B163 | Higher Ni (38-46%) and Cu (1.5-3.0%); better resistance to sulfuric acid (but lower PREN ~32) |
6. Typical Applications
Alloy 926 / EN 1.4529 pipes are widely used in industries where corrosion resistance, pressure tolerance, and durability are non-negotiable. Key application areas include:
- Oil & Gas: Offshore seawater injection lines, subsea pipelines, and sour gas (H₂S-containing) transport systems (resists Cl-SCC and sulfide stress cracking).
- Chemical Processing: Piping for sulfuric acid (dilute), phosphoric acid, and amine scrubbing systems (avoids corrosion from aggressive process chemicals).
- Marine Engineering: Seawater cooling systems, shipboard piping, and coastal infrastructure (withstands saltwater exposure without pitting).
- Water Treatment: Desalination plants (reverse osmosis feed lines) and wastewater treatment pipes (resists chlorinated water).
- Power Generation: Flue gas desulfurization (FGD) systems in coal-fired power plants (handles acidic scrubber solutions).
- Pharmaceutical & Food Processing: Sanitary piping for high-purity processes (low carbon content prevents contamination; easy to clean).
7. Welding & Fabrication Notes
To maintain the alloy’s corrosion resistance post-fabrication, welding of Alloy 926 / EN 1.4529 pipes requires careful control:
- Filler Metal: Use matching super austenitic fillers (e.g., ERNiCrMo-3 or ERNiCrMo-10) to avoid compositional dilution.
- Heat Input: Limit heat input to <1.5 kJ/mm to prevent grain coarsening (which reduces impact toughness).
- Post-Weld Treatment: No mandatory post-weld heat treatment (PWHT) is needed, but pickling (with nitric-hydrofluoric acid) is recommended to remove weld scale and restore the passive oxide layer.
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