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UNS S31703 / Alloy 317L Stainless Steel Pipe SS Pipe ASTM A312 With Good 3/5000 Corrosion-resistant
| Τόπος καταγωγής | Κίνα |
|---|---|
| Μάρκα | DELTA |
| Πιστοποίηση | ISO |
| Αριθμό μοντέλου | 309S |
| Ποσότητα παραγγελίας min | 1000 κιλά |
| Τιμή | 5.2 - 6.5 USD/Kg |
| Συσκευασία λεπτομέρειες | τυπική συσκευασία για εξαγωγή |
| Χρόνος παράδοσης | 5 - 12 ημέρες με βάση την ποσότητα |
| Όροι πληρωμής | L/C, T/T, Western Union |
| Δυνατότητα προσφοράς | 4 τόνοι την εβδομάδα |
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xΛεπτομέρειες
| Προϊόντα | Σωλήνας από ανοξείδωτο χάλυβα | Βαθμός | 317L |
|---|---|---|---|
| Διάμετρος | DN10 - DN400 | Μήκος | 6m ή προσαρμοσμένη κοπή οποιουδήποτε μήκους ως αίτημα |
| Πρότυπο | Astm en | Υπηρεσία | Τομή |
| Θύρα φόρτωσης | Λιμάνι της Σαγκάης | Πάχος | 4.0 - 50.0mm |
Περιγραφή προϊόντων
UNS S31703 / Alloy 317L Stainless Steel Pipe SS Pipe ASTM A312 With Good 3/5000 Corrosion-resistant
Products Specification
| Products Name | 317L 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 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 |
UNS S31703 / Alloy 317L Stainless Steel Pipe SS Pipe ASTM A312 With Good Corrosion-resistant
UNS S31703 (also known as Alloy 317L) stainless steel pipe, manufactured in compliance with ASTM A312 standard, is a premium austenitic stainless steel product renowned for its exceptional corrosion resistance, mechanical stability, and versatility. It is widely used in harsh industrial environments where resistance to chemical attack, high temperatures, and oxidation is critical. Below is a comprehensive overview of its parameters, performance, production process, standards, advantages, equivalent grades, and applications.
1. Core Chemical Composition (Parameters)
The unique corrosion resistance and mechanical properties of UNS S31703/317L stem from its precise chemical composition, with molybdenum (Mo) being the key alloying element that enhances resistance to pitting and crevice corrosion (a common failure mode in chloride-rich environments). The composition complies with ASTM A312 and UNS S31703 specifications:
| Element | Content Range (%) | Role |
|---|---|---|
| Carbon (C) | ≤ 0.03 | Low carbon content prevents carbide precipitation during welding, avoiding intergranular corrosion. |
| Chromium (Cr) | 18.00 - 20.00 | Forms a dense, adherent chromium oxide (Cr₂O₃) passive film, resisting general oxidation and corrosion. |
| Nickel (Ni) | 11.00 - 15.00 | Stabilizes the austenitic crystal structure, improving ductility and toughness (especially at low temperatures). |
| Molybdenum (Mo) | 3.00 - 4.00 | Enhances resistance to pitting, crevice corrosion, and sulfuric acid attack (critical for marine or chemical applications). |
| Manganese (Mn) | ≤ 2.00 | Improves workability and strength without compromising ductility. |
| Silicon (Si) | ≤ 1.00 | Aids in deoxidation during melting and enhances high-temperature oxidation resistance. |
| Phosphorus (P) | ≤ 0.045 | Controlled to minimize brittleness and ensure weldability. |
| Sulfur (S) | ≤ 0.030 | Reduced to avoid hot cracking during fabrication and maintain corrosion resistance. |
| Nitrogen (N) | ≤ 0.10 | Supplementary element to boost strength without sacrificing ductility. |
2. Mechanical Performance
UNS S31703/317L stainless steel pipe exhibits balanced mechanical properties, making it suitable for both pressure-bearing and structural applications. The values below are typical for pipes in the annealed state (common delivery condition) and meet ASTM A312 requirements:
| Mechanical Property | Specification (ASTM A312) | Typical Value | Test Condition |
|---|---|---|---|
| Tensile Strength (σb) | ≥ 485 MPa (70 ksi) | 550 - 650 MPa | Room temperature |
| Yield Strength (σ0.2) | ≥ 170 MPa (25 ksi) | 200 - 300 MPa | Room temperature |
| Elongation (δ) | ≥ 35% | 40 - 45% | After fracture (50mm gauge length) |
| Hardness (Brinell, HB) | ≤ 217 | 180 - 210 | Annealed |
| Impact Toughness (Charpy) | ≥ 100 J | 120 - 150 J | -40°C (low-temperature toughness, no brittle fracture) |
High-Temperature Performance: It retains good strength and oxidation resistance up to 870°C (1600°F). For short-term use (e.g., thermal cycling), it can withstand temperatures up to 980°C (1800°F) without significant degradation.
3. Production Process
The manufacturing of UNS S31703/317L stainless steel pipe (ASTM A312) follows strict procedures to ensure dimensional accuracy, surface quality, and material integrity. The key steps are:
- Raw Material Selection: High-purity stainless steel billets or ingots with UNS S31703 composition are used, inspected for chemical uniformity and defects (e.g., inclusions).
- Melting & Casting: Billets are melted via electric arc furnace (EAF) or vacuum induction melting (VIM) (for high-purity requirements) to control impurities, then cast into seamless pipe blanks.
- Seamless Pipe Formation:
- Hot Piercing: Blanks are heated to 1100 - 1250°C and pierced into hollow shells using a mandrel mill.
- Hot Rolling/Extrusion: Shells are rolled (via continuous pipe mill) or extruded to achieve the desired outer diameter (OD) and wall thickness (WT).
- Annealing: Pipes are annealed at 1010 - 1150°C, followed by rapid water quenching. This step softens the material, restores ductility, and reforms the passive oxide film (critical for corrosion resistance).
- Cold Finishing (Optional): For precision applications (e.g., medical or semiconductor), pipes undergo cold drawing or cold rolling to improve dimensional tolerance (e.g., OD ±0.1mm) and surface smoothness (Ra ≤ 0.8μm).
- Heat Treatment for Welded Pipes: If producing welded ASTM A312 pipes (e.g., ERW - Electric Resistance Welded), a post-weld annealing process is required to eliminate residual stress and prevent intergranular corrosion.
- Inspection & Testing:
- Non-Destructive Testing (NDT): Ultrasonic testing (UT) for internal defects, eddy current testing (ECT) for surface flaws, and hydrostatic testing (1.5× design pressure) to verify leak tightness.
- Chemical & Mechanical Testing: Sample analysis for composition compliance and tensile/impact tests to confirm mechanical properties.
- Surface Treatment: Pipes are pickled (with nitric-hydrofluoric acid) to remove scale, then passivated (with nitric acid) to enhance the passive film’s durability.
4. Applicable Standards
UNS S31703/317L stainless steel pipe is manufactured and inspected in accordance with global standards to ensure compatibility with industry requirements. The primary standards include:
| Standard Code | Standard Name | Scope of Application |
|---|---|---|
| ASTM A312 | Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes | Defines dimensions, chemical composition, mechanical properties, testing methods, and delivery requirements for pipes used in pressure systems. |
| UNS S31703 | Unified Numbering System for Metals and Alloys | Classifies the alloy as a low-carbon, molybdenum-containing austenitic stainless steel. |
| ASME B36.19M | Stainless Steel Pipe (Metric) | Specifies dimensional tolerances (OD, WT, length) for stainless steel pipes, including 317L. |
| EN 10216-5 | Seamless Steel Tubes for Pressure Purposes - Part 5: Austenitic Stainless Steels | European standard equivalent to ASTM A312, applicable for pipes in EU markets. |
| JIS G3459 | Stainless Steel Pipes and Tubes | Japanese industrial standard for stainless steel pipes, including 317L grade. |
5. Key Advantages
Compared to conventional austenitic stainless steels (e.g., 304L, 316L), UNS S31703/317L offers distinct advantages, especially in harsh environments:
- Superior Corrosion Resistance: Higher molybdenum content (3-4%) provides exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC) in chloride-rich media (e.g., seawater, brine, chemical process streams). It also resists attack by dilute sulfuric acid, phosphoric acid, and organic acids.
- Excellent Weldability: Low carbon content (≤0.03%) prevents carbide precipitation at the weld heat-affected zone (HAZ), eliminating intergranular corrosion without requiring post-weld heat treatment (PWHT) in most cases. Common welding methods (TIG, MIG, SMAW) are applicable.
- Broad Temperature Range: Maintains ductility and strength from cryogenic temperatures (-270°C) to high temperatures (870°C), suitable for both low-temperature storage and high-temperature process piping.
- Good Mechanical Balance: Combines high tensile strength with excellent ductility, enabling easy fabrication (bending, flanging, cutting) without cracking.
- Long Service Life: The stable passive oxide film and resistance to environmental degradation reduce maintenance costs and extend the pipe’s service life in aggressive applications.
6. Equivalent Grades
UNS S31703/317L has equivalent grades across major global standards, ensuring interchangeability in international projects:
| Region/Standard | Equivalent Grade | Notes |
|---|---|---|
| USA | UNS S31703, ASTM A312 317L | Primary grade; UNS S31703 is the material designation, while ASTM A312 is the pipe standard. |
| Europe | EN 1.4438, EN 10216-5 1.4438 | Molybdenum content (3-4%) matches UNS S31703; used in EU industrial applications. |
| Japan | JIS G3459 SUS317L | Complies with JIS specifications; equivalent in composition and performance. |
| China | GB/T 14976 022Cr19Ni13Mo3 | National standard equivalent; “022” indicates low carbon (≤0.03%). |
| International | ISO 15510 X2CrNiMo18-13-3 | ISO designation for low-carbon, molybdenum-enhanced austenitic stainless steel. |
7. Typical Applications
Due to its robust performance, UNS S31703/317L stainless steel pipe is widely used in industries requiring high corrosion resistance and reliability:
- Chemical Processing: Piping for handling sulfuric acid, phosphoric acid, organic acids, and chemical solvents (e.g., in fertilizer plants, pharmaceutical manufacturing, petrochemical refineries).
- Marine & Offshore: Seawater cooling systems, offshore platform piping, desalination plants, and shipboard piping (resists seawater-induced pitting and corrosion).
- Food & Beverage: Piping for acidic food products (e.g., citrus juices, pickles) and high-temperature cleaning processes (CIP - Clean-in-Place), as it is non-toxic and easy to sanitize.
- Pharmaceutical & Biotechnology: Hygienic piping for drug synthesis, vaccine production, and pure water systems (complies with FDA requirements for material safety).
- Power Generation: High-temperature piping in fossil fuel power plants (flue gas desulfurization systems) and nuclear power plants (secondary cooling loops, where corrosion resistance is critical).
- Wastewater Treatment: Piping for corrosive wastewater streams (e.g., industrial effluent with high chloride or sulfate content) and anaerobic digestion systems.
- Aerospace & Defense: Cryogenic piping for rocket fuel storage (liquid oxygen, liquid nitrogen) and high-temperature ducting in aircraft engines.
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