Repsol Steel LLP is a trusted carbon steel flange supplier, supplying a comprehensive range of CS flanges to industrial buyers, EPC contractors, and procurement teams across Africa, USA, Mexico, Oman, and Europe. Carbon steel flanges are manufactured primarily from ASTM A105 forged carbon steel — the standard material for general-purpose piping applications — and provide an excellent balance of strength, toughness, and cost-effectiveness. They are widely used in oil & gas, petrochemical, refinery, power generation, and general industrial piping systems. We supply carbon steel flanges in A105, A105N, and other CS grades in weld neck, slip-on, blind, lap joint, socket weld, and threaded types — with full documentation, EN 10204 3.1 certification, and international packaging standards.
With over 25 years of combined industry experience and a proven export network, we serve clients across Africa, the United States, Mexico, Oman, and Europe — including Oil & Gas, petrochemical, refinery, power generation, chemical processing, and marine facilities. Our supply operations are structured to meet the documentation, packaging, and compliance requirements of international industrial procurement — including Material Test Certificates (MTC), dimensional inspection reports, NACE compliance, PMI testing, and third-party certification where required.
Whether you require standard A105 carbon steel weld neck flanges for a refinery in Oman, A105N slip-on flanges for a petrochemical plant in Mexico, or blind flanges for a pressure vessel in Africa or the USA — Repsol Steel LLP delivers the right carbon steel flange solution, on time, with complete export documentation.
A complete carbon steel flange supply portfolio covering weld neck, slip-on, blind, lap joint, socket weld, and threaded flanges — engineered for high-pressure and high-temperature piping systems across Africa, USA, Mexico, Oman, and Europe.
CS weld neck flanges with a long tapered hub that provides smooth stress distribution. Used in high-pressure and high-temperature piping systems where cyclic loading is a concern.
Grades: A105, A105N
Compliance: ASME B16.5, B16.47, EN 1092-1
Size Range: ½" to 60"
CS slip-on flanges slide over the pipe and are fillet welded at both ends. Cost-effective and easy to align, used in low-pressure and moderate-pressure piping systems.
Grades: A105, A105N
Compliance: ASME B16.5, B16.47, EN 1092-1
Size Range: ½" to 60"
CS blind flanges with no center hole, used to close off pipe ends, valves, and pressure vessel openings. Essential for isolation, inspection, and future expansion.
Grades: A105, A105N
Compliance: ASME B16.5, B16.47, EN 1092-1
Size Range: ½" to 60"
CS lap joint flanges for use with stub ends in piping systems requiring frequent dismantling. The flange is free to rotate, allowing easy alignment of bolt holes.
Grades: A105, A105N
Compliance: ASME B16.5
Size Range: ½" to 24"
CS socket weld flanges for high-pressure and small-bore piping. The pipe is inserted into the socket and fillet welded, providing a strong, leak-proof joint.
Grades: A105, A105N
Compliance: ASME B16.5
Size Range: ½" to 4"
CS threaded flanges (NPT/BSP) for utility piping, plus custom-manufactured carbon steel flanges in non-standard sizes, materials, and configurations per project specifications.
Grades: A105, A105N
Compliance: ASME B16.5, DIN
Size Range: ½" to 24"
Carbon steel flanges are supplied primarily in ASTM A105 grade — the standard forged carbon steel specification for piping applications across Africa, USA, Mexico, Oman, and Europe. A105 provides excellent strength, toughness, and weldability at a cost-effective price point. We supply carbon steel flanges in the following materials and grades:
All carbon steel flanges we supply are accompanied by Material Test Certificates (MTC to EN 10204 3.1) confirming the exact grade, mechanical properties, and heat number — ensuring full traceability and compliance with international project specifications. PMI testing is available on request.
| Parameter | Specification |
|---|---|
| Flange Types | Weld Neck, Slip-On, Blind, Lap Joint, Socket Weld, Threaded, Orifice, Long Weld Neck |
| Materials | ASTM A105, A105N, A350 LF2, A694, A516 Carbon Steel |
| Size Range | ½" to 60" standard; larger sizes available on request |
| Pressure Classes | PN6, PN10, PN16, PN25, PN40 (EN 1092-1); Class 150, 300, 600, 900, 1500, 2500 (ASME B16.5) |
| Face Types | RF (Raised Face), FF (Flat Face), RTJ (Ring Type Joint) |
| Standards Compliance | ASME B16.5, ASME B16.47, ASTM A105, A350, A694, EN 1092-1, DIN, BS |
| Export Documentation | Commercial Invoice, Packing List, Bill of Lading, Certificate of Origin, MTC (EN 10204 3.1) |
| Inspection Options | PMI testing, ultrasonic testing, radiography, third-party inspection (SGS, BV, TUV, Intertek) available on request |
| Additional Documentation | Hardness test reports, NACE compliance, H2S service documentation available on request |
Carbon steel flanges are the most widely used flange type in industrial piping due to their excellent balance of strength, toughness, and cost. Before finalizing a carbon steel flange for projects in Africa, USA, Mexico, Oman, or Europe, our technical team recommends evaluating four key factors:
If you are unsure which carbon steel flange specification best suits your application, our technical team is available to review your piping drawings, process data, and project specifications — and recommend the most suitable carbon steel flange solution.
We have supplied carbon steel flanges to buyers across Africa, the USA, Mexico, Oman, and Europe — building a supply track record that reflects reliability, compliance, and on-time delivery.
Every carbon steel flange shipment is accompanied by complete export documentation — Commercial Invoice, Packing List, Bill of Lading, Certificate of Origin, Material Test Certificates (MTC to EN 10204 3.1), and third-party inspection reports on request.
Our carbon steel flanges comply with ASME B16.5, ASME B16.47, ASTM A105, A350, A694, EN 1092-1, DIN, and BS standards — ensuring that products meet the exact specifications of international industrial projects.
Carbon steel flanges are packed with rust-preventive coating and moisture-resistant export-grade packaging designed for long-distance sea, air, and road transport — protecting product integrity from factory to destination.
We support a range of Incoterms — FOB, CIF, CFR, EXW, DAP — and coordinate with trusted freight partners for sea, air, and multimodal shipments to major ports across Africa, USA, Mexico, Oman, and Europe based on buyer preference.
Our support team assists buyers with grade selection, carbon steel flange specification review, documentation, shipping coordination, and post-delivery follow-up — ensuring a smooth experience at every stage.
Repsol Steel LLP supplies carbon steel flanges to a wide range of process industries across Africa, USA, Mexico, Oman, and Europe where high-strength, cost-effective, and reliable bolted connections are essential for piping system efficiency.
A105 and A350 LF2 carbon steel flanges supplied for wellhead equipment, pipeline systems, process piping, and high-pressure transfer lines in upstream, midstream, and downstream operations across Africa, USA, Mexico, Oman, and Europe.
A105 carbon steel flanges supplied for reactors, heat exchangers, process piping, and storage systems handling hydrocarbons at high pressures and temperatures.
A105 carbon steel flanges supplied for high-temperature and high-pressure process piping in crude distillation, catalytic cracking, and hydroprocessing units.
A105 carbon steel flanges supplied for boilers, steam systems, turbine connections, and high-pressure auxiliary piping in thermal and combined-cycle power plants.
A350 LF2 carbon steel flanges supplied for low-temperature and cryogenic piping systems in LNG plants, gas processing units, and cold storage facilities down to -46°C.
A105 carbon steel flanges supplied for water pipelines, treatment plant piping, and utility systems in municipal and industrial water treatment facilities.
Carbon steel flanges supplied to fabrication units and EPC contractors for piping spools, skids, modular systems, and industrial assemblies — with quick turnaround times and documentation support.
Repsol Steel LLP is recognized as a reliable carbon steel flange supplier for procurement teams, EPC contractors, and maintenance projects across Africa, the USA, Mexico, Oman, and Europe. Our export documentation, packaging, and standard compliance are structured for smooth cross-border supply to buyers worldwide — ensuring your carbon steel flanges arrive on time, in specification, and ready for installation.
Africa: Oil & Gas, mining, refinery & industrial piping projects
USA: Oil & Gas, chemical, power generation & EPC supply
Mexico: Refinery, petrochemical & process industry projects
Oman: Oil & Gas, petrochemical, desalination & refinery projects
Europe: Chemical, power, marine & industrial piping supply
All carbon steel flanges are supplied with material certificates, dimensional inspection reports, PMI testing, and third-party certification as required by project specifications.
Yes. We are a leading carbon steel flange supplier serving buyers across Africa, the USA, Mexico, Oman, and Europe — offering A105, A105N, A350 LF2, A694, and A516 carbon steel flanges in weld neck, slip-on, blind, lap joint, socket weld, and threaded types.
A carbon steel flange is a forged piping component made from carbon steel (primarily ASTM A105) used to connect pipes, valves, and equipment. It provides high strength, toughness, and weldability at a cost-effective price point. Carbon steel flanges are widely used in oil & gas, petrochemical, refinery, power generation, and general industrial piping systems.
We supply carbon steel flanges in ASTM A105, A105N (normalized), A350 LF2 (low-temperature), A694 (high-yield), and A516 (pressure vessel quality) grades.
A105 is the standard forged carbon steel grade for general piping applications. A105N is the normalized version, which has undergone normalizing heat treatment to improve toughness and hardness. A105N is preferred for low-temperature and critical service applications where enhanced toughness is required.
Yes. We offer custom sizes, pressure classes, carbon steel grades, face types, and flange configurations based on drawings, piping specifications, and project requirements — with quick turnaround times.
Send us your carbon steel flange specifications, grade requirements, or drawings. Our export team will respond within 24 hours with a tailored quotation.
Repsol Steel LLP is a leading manufacturer and stockholder of high-quality piping products, serving the Oil, Gas, Petrochemical, and Nuclear industries with reliable engineering solutions.
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