Table of Contents
- Introduction
- Chemical Composition
- Mechanical Properties
- Physical & Thermal Properties
- Equivalent Grades
- Coupling Details
- Manufacturing Process
- Sizes & Dimensions
- Types Available
- Applications
- Industries Served
- Grade Comparison
- Why BB Infras?
- Certifications & QC
- Export & Packaging
- Coupling Marking
- Coating Options
- Testing Procedure
- Storage Guidelines
- Downloads
- Cities We Supply
- Countries We Export
- FAQ
- People Also Ask
- Related Products
| Material | High-Strength Line Pipe |
| Grade | API 5L X65 / API 5L X65 / ISO 3183 L450 |
| Standard | API 5L X65 / ISO 3183 L450 |
| Type | Coupling |
| Size Range | OD 168 mm – 1422 mm, wall 6 mm – 40 mm |
| Pressure Class | 2000# – 9000# (ASME B16.11) |
| Tensile Strength | 535 MPa min |
| Yield Strength | 448 MPa min |
| MTC | EN 10204 3.1 Mill Test Certificate |
| MOQ | 100 kg (standard sizes) |
Quick Answers
API 5L X65 Coupling – Overview
API 5L X65 delivers 448 MPa minimum yield strength for demanding high-pressure pipeline applications. Its combination of strength, toughness and weldability is essential for long-distance, large-diameter gas transmission pipelines.
BB Infras is an established API 5L X65 Coupling supplier to EPC contractors and pipeline operators across India and the Gulf region. We stock both PSL1 and PSL2 grades; sour-service documentation including HIC and SSC test reports is available on request for critical pipeline applications. API 5L X65 Coupling is supplied to ASME B16.11 in Class 2000#, 3000# and 6000# with NPT or socket weld ends. Sizes from ¼” to 4” NB are available ex-stock from our Mumbai warehouse.
Need a quote for API 5L X65 Coupling?
Our sales team responds within 2 business hours with price & availability.
Request Quote WhatsAppChemical Composition of API 5L X65
The following table shows the chemical composition per API 5L X65 / ISO 3183 L450.
| C | Mn | P | S | Si | V+Nb+Ti | CEQ |
|---|---|---|---|---|---|---|
| ≤ 0.14 | ≤ 1.65 | ≤ 0.025 | ≤ 0.015 | ≤ 0.45 | ≤ 0.15 | ≤ 0.43 |
Mechanical Properties of API 5L X65
| Property | Value |
|---|---|
| Tensile Strength | 535 MPa min |
| Yield Strength | 448 MPa min |
| Elongation | 21% min |
| Charpy (0 °C) | ≥ 41 J (PSL2) |
Physical & Thermal Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1420–1530 °C |
| Thermal Conductivity | 49 W/m·K |
| Thermal Expansion | 11.8 × 10⁻⁶ /°C |
| Elastic Modulus | 210 GPa |
| Specific Heat | 480 J/kg·K |
| Electrical Resistivity | 0.171 μΩ·m |
Equivalent Grades of API 5L X65
| Standard Body | Equivalent Grade |
|---|---|
| API | 5L X65 |
| EN ISO 3183 | L450 |
| DNV | 485 |
| ASTM approx. | A694 F65 |
Coupling – Product Details
Applicable Standards: ASME B16.11, BS 3799, MSS SP-83
Manufacturing Process: Forged from bar stock; machined to socket or thread specifications.
Heat Treatment: TMCP mandatory for PSL2; PWHT at 550–600 °C for girth welds.
API 5L X65 Coupling – Manufacturing Process
Coupling is produced using a controlled sequence of operations to achieve the dimensional and mechanical requirements of API 5L X65 / ISO 3183 L450.
900–1100 °C
Thread / Socket bore
Per ASME B16.11
API 5L X65 Coupling – Sizes & Dimensions
Size range: OD 168 mm – 1422 mm, wall 6 mm – 40 mm. The following dimensional data covers standard sizes. Non-standard sizes available on request.
| NPS | OD (mm) | SW Bore (mm) | Threaded Class 3000 |
|---|---|---|---|
| ½" | 21.3 | 13.8 | ½" NPT |
| ¾" | 26.7 | 17.3 | ¾" NPT |
| 1" | 33.4 | 22.2 | 1" NPT |
| 1½" | 48.3 | 32.5 | 1½" NPT |
| 2" | 60.3 | 40.9 | 2" NPT |
| 3" | 88.9 | 62.7 | 3" NPT |
| 4" | 114.3 | 81.8 | 4" NPT |
Types of API 5L X65 Coupling
- Full Coupling (SW)
- Half Coupling (SW)
- Reducing Coupling
- Threaded Coupling
Applications of API 5L X65 Coupling
Industries We Serve
Ready to order API 5L X65 Coupling?
Stock available in Mumbai. Same-day quotation. Export documentation included.
Email Quote Call NowAPI 5L X65 – Grade Specification
| Standard | Category | Tensile Strength | Yield Strength | Elongation |
|---|---|---|---|---|
| API 5L X65 / ISO 3183 L450 ✓ | High-Strength Line Pipe | 535 MPa min | 448 MPa min | 21% min |
| API (5L X65) | Equivalent | See equivalent grades table above | ||
| EN ISO 3183 (L450) | Equivalent | See equivalent grades table above | ||
| DNV (485) | Equivalent | See equivalent grades table above | ||
| ASTM approx. (A694 F65) | Equivalent | See equivalent grades table above | ||
* All values are minimum guaranteed per API 5L X65 / ISO 3183 L450. Actual mill certificates may show higher values.
Why Buy API 5L X65 Coupling from BB Infras?
| Ready Stock | Large inventory of API 5L X65 Coupling in popular sizes maintained in our Mumbai warehouse for immediate dispatch. |
| Certified Material | All material supplied with EN 10204 3.1 Mill Test Certificates from NABL-accredited labs. TPI by SGS, BV, TUV on request. |
| Worldwide Export | We export API 5L X65 Coupling to 80+ countries with complete export documentation — COO, packing list, B/L, fumigation certificates. |
| Competitive Pricing | Direct mill sourcing and bulk buying ensures competitive prices. No middlemen. Transparent pricing with no hidden charges. |
| Fast Delivery | Standard sizes dispatched within 3–5 business days. Custom sizes within 3–4 weeks. Urgent orders accommodated. |
| Value-Added Services | Cut-to-length, bevelling, threading, galvanising, painting, marking & stencilling available in-house. |
| Technical Support | Our metallurgical team assists with grade selection, standard interpretation, and material substitution queries. |
| MSME Registered | Registered MSME supplier. Eligible for GeM portal procurement and government tenders. |
Certifications & Quality Inspection
Every API 5L X65 Coupling supplied by BB Infras undergoes the following quality controls:
Quality Inspection Checklist
- Chemical composition analysis (OES / wet analysis)
- Mechanical testing: tensile, yield, elongation, impact
- Dimensional inspection per applicable ASME standard
- Visual and surface finish inspection
- Hydrostatic or pneumatic pressure testing
- Non-Destructive Testing: UT, RT, MT, PT on request
- Positive Material Identification (PMI) on request
Export Packaging & MOQ
- Minimum Order Quantity (MOQ): 100 kg or 1 piece (standard sizes); 500 kg for custom sizes
- Packing for Pipes/Tubes: Bundled with steel strapping, plastic end caps, moisture-proof wrapping
- Packing for Fittings/Flanges: Wooden box / wooden pallet, plywood case for heavy items
- Sea Freight: FCL / LCL container, fumigation certificate provided
- Air Freight: Available for urgent requirements
- Documents: Commercial Invoice, Packing List, Certificate of Origin, MTC, Bill of Lading, Insurance Certificate
- Marking: Heat number, grade, size, schedule, standard per ASTM A5.40 / ASME marking requirements
Coupling Marking & Identification
Every API 5L X65 Coupling supplied by BB Infras is marked per API 5L X65 / ISO 3183 L450 and ASME marking requirements. Standard marking sequence:
- Manufacturer name / mark
- Material specification — API 5L X65
- Product type — Coupling
- Wall thickness / Schedule
- Heat / lot number — for MTC traceability
Coating & Surface Finish Options
| Coating Type | Standard | Application | Lead Time |
|---|---|---|---|
| Black (Mill Finish) | Per standard | General process service | In Stock |
| Yellow Zinc Chromate Primer | — | Corrosion protection in transit | In Stock |
| Hot-Dipped Galvanised (HDG) | ASTM A123 | Plumbing & utility service | 3–5 days |
| Two-Coat Epoxy | — | Chemical & offshore service | 1–2 weeks |
Testing & Inspection Procedure
All API 5L X65 Coupling supplied by BB Infras undergo a multi-stage inspection and testing process before dispatch:
| # | Test / Inspection | Standard / Method | Acceptance |
|---|---|---|---|
| 1 | Chemical Composition (OES) | ASTM E415 | Per API 5L X65 Table 1 |
| 2 | Tensile & Yield Strength | ASTM E8 | ≥535 MPa min / ≥448 MPa min |
| 3 | Elongation | ASTM E8 | ≥21% min |
| 4 | Hardness (HB) | ASTM E10 | Per standard max |
| 5 | Hydrostatic Test | API 5L X65 / ASME B31.3 | Leak-free at test pressure |
| 6 | Dimensional Inspection | ASME B16.9 / B16.11 | Within tolerance |
| 7 | Visual & Surface | ASTM A530 / MSS SP-55 | Free from defects |
| 8 | Ultrasonic Testing (UT) | ASTM E213 (on request) | No sub-surface defects |
| 9 | PMI (XRF) | ASTM E1476 (on request) | Grade confirmation |
Storage & Handling Guidelines
- Store on wooden dunnage or pipe racks — never directly on concrete to avoid moisture-induced corrosion.
- Stack with appropriate separators; observe safe stack heights to prevent deformation.
- Apply plastic end caps or plugs to all open ends to prevent ingress of moisture, dust and insects.
- Keep material dry and ventilated; store under cover in humid or coastal climates.
- Use nylon slings or padded lifting hooks — never bare wire rope directly on surface.
- For long-term storage (>6 months), re-apply protective oil coating or wrap with VCI (Vapour Corrosion Inhibitor) film.
- Identify items with heat number tags throughout storage for full MTC traceability.
Downloads & Technical Resources
Request product documentation from our technical team. Available on enquiry:
Contact our technical team with your enquiry details and we will share the relevant document within 24 hours.
API 5L X65 Coupling Supplier in India
BB Infras supplies API 5L X65 Coupling to customers across India from our Mumbai stockyard. We serve all major industrial hubs — refineries in Jamnagar and Haldia, petrochemical clusters in Dahej and Panipat, shipyards in Kochi and Visakhapatnam, and fabrication workshops across Pune, Rajkot, Surat and Coimbatore — with same-day quotation and fast dispatch.
View all cities we supply ▾
API 5L X65 Coupling Exporter – Countries We Ship To
BB Infras exports API 5L X65 Coupling to 80+ countries with complete export documentation — Certificate of Origin, Material Test Certificate, Packing List, Bill of Lading and Fumigation Certificate. We are a trusted exporter to UAE, Saudi Arabia, Qatar, Oman and Kuwait in the Middle East; to Singapore, Malaysia, Indonesia and Vietnam in Southeast Asia; to South Africa, Nigeria and Kenya in Africa; and to the USA, UK, Germany and Netherlands in Europe and North America.
View all export countries ▾
Frequently Asked Questions
Get the best price for API 5L X65 Coupling
Talk to our sales team — available Mon–Sat, 9 AM – 7 PM IST. Same-day quotes.
Contact Us Today +91-9152677155People Also Ask
What standard does API 5L X65 Coupling conform to?
API 5L X65 Coupling conforms to ASME B16.11, BS 3799, MSS SP-83. Dimensional inspection is carried out per these standards before dispatch.
What end connections are available for API 5L X65 Coupling?
Available with buttweld (BW) per ASME B16.25, socket weld (SW) and threaded (NPT/BSP) ends. Specify end connection at enquiry.
What is the tensile and yield strength of API 5L X65?
Per API 5L X65: minimum tensile is 535 MPa min and minimum yield is 448 MPa min.
Do you supply API 5L X65 Coupling with MTC?
Yes. EN 10204 3.1 Mill Test Certificates supplied with all products. TPI by SGS, TUV, BV or Lloyd's available on request.
What is the price of API 5L X65 Coupling in India?
Prices vary by size, schedule, quantity and current market rates. Contact BB Infras for a firm quotation from our Mumbai stockyard.
Authoritative Standards Referenced
| Standard | Issuing Body | Scope |
|---|---|---|
| API 5L X65 / ISO 3183 L450 | ASTM / ASME | Material specification for API 5L X65 |
| ASME B16.11 | ASME | Forged fittings — socket welding and threaded |
| EN 10204:2004 | CEN | Metallic products — types of inspection documents (3.1 MTC) |
| NACE MR0175 / ISO 15156 | NACE/ISO | Materials for H₂S service in oil and gas production |
