ASTM A671 CC70 Pipe

ASTM A671 CC70 Pipe – Electric Fusion Welded Carbon Steel Pipe for High-Pressure Low-Temperature Applications

Hebei Longma Group manufactures ASTM A671 CC70 Pipe with exceptional strength and toughness for demanding pressure systems. We create electric fusion welded pipe using ASTM A516 Grade 70 pressure vessel plate with a tensile strength of 70 ksi (485 MPa) and a yield strength of 38 ksi (260 MPa). We provide more than 1,000,000 tons per year from our 230,000 square metre manufacturing plant with an outside diameter from 60.3mm to 2032mm and a wall thickness from 4mm to 100mm. Each product is inspected under rigorous inspection process and supplied with full MTC paperwork, hydrostatic test results and NDT records.

Understanding ASTM A671 CC70 Carbon Steel Pipe Construction

The product is special carbon steel electric-fusion-welded for low temperature and atmospheric pressure service. The CC70 designation is a combination of the basic material, ASTM A516 Grade 70 pressure vessel grade plate, with electric fusion welding technique that adds filler metal for enhanced joint integrity.

This approach to production tackles major industrial issues. The big diameter seamless pipes have the manufacturing restriction and pricing obstacles. The device addresses these challenges with sophisticated EFW welding procedures which retain the structural dependability for pipe sizes of large diameter.

The material composition is well matched with amount of carbon (0.27% maximum), manganese (0.85-1.20%) and silicon (0.15-0.40%). This chemical composition gives outstanding weldability and fine grain structure, important for low temperature use.

Technical Specifications and Material Properties of ASTM A671 CC70 Pipe

The mechanical properties of the CC70 grade provide real performance benefits. Your system has upgraded strength capabilities against CC60 and CC65 grades such that it can operate safely at greater pressure situations. The material shows excellent fracture toughness and high ductility, which decreases the probability of brittle fracture at cold service temperatures.

Performance Benefits for Industrial Applications

By selecting product your pressure pipe projects will have a number of technical benefits. The electric fusion welding technology provides long-term operating dependability via precise dimensional control and constant weld quality.

The pipe has a very good notch toughness, which offers important safety margins for applications with different thermal stresses. Impact tests at prescribed temperatures prove performance under real service circumstances. This is particularly critical in LNG plants, cryogenic systems and outdoor installations in cold regions.

The huge diameter production capabilities eliminates any size problems you may have with seamless options. Pipes may be supplied with outside diameters up to 2032mm and wall thicknesses up to 100mm. This is suitable for high pressure systems needing large flow capacity.

Cost efficiency represents another practical advantage. Compared to seamless pipe production for large diameters, electric fusion welding delivers pressure vessel grade performance while maintaining budget feasibility for large-scale infrastructure projects.

Manufacturing Quality and Inspection Standards

Longma Group will do a full quality test for every single product before shipping out. We build to the strictest ASTM A671 and ASME SA671 requirements, with extra controls to maintain uniformity from batch to batch.

Raw material selection starts with pressure vessel grade plate obtained from approved mills such as Shagang, TISCO and Bao Steel. Complete heat number traceability ties your final pipe back to the original steel composition information.

We qualify and test our welding techniques before they are put into production. Skilled welding teams perform the electric fusion welding, using carefully regulated conditions and under constant monitoring to ensure the integrity of the connection. Heat treatment is done as per class requirements i.e. class 10, class 22 or class 32 for best microstructure and mechanical characteristics.

Non Destructive Examination involves Radiographic Testing of longitudinal welds for any discontinuities which may affect pressure containment. Hydrostatic testing is performed to verify structural integrity at pressure settings above your design specifications.

When your project specifications require Charpy V-Notch impact testing, we conduct these evaluations at designated temperatures. Test results confirm the material's ability to resist brittle fracture under actual service conditions.

Comprehensive Documentation and Certification Support

Understanding that international projects require thorough documentation, we provide complete technical files with every ASTM A671 CC70 Pipe shipment. Your quality assurance team receives Material Test Certificates containing chemical composition analysis, mechanical test results including yield strength, tensile strength, elongation, and impact values when specified.

Dimensional inspection reports verify outer diameter, wall thickness, length, and straightness against your purchase order requirements. Surface inspection records document visual examination results and any surface treatment applications.

For projects requiring third-party verification, we coordinate inspections with organizations such as Bureau Veritas, TÜV, SGS, or Intertek. Their independent verification provides additional assurance for critical applications.

Our API 5L Certificate, ISO 9001 Quality Management System, ISO 14001 Environmental Management, and ISO 18001 Occupational Health and Safety certifications demonstrate systematic quality control throughout manufacturing operations.

Application Scope Across Industrial Sectors

The product serves diverse industrial applications where strength, toughness, and pressure containment are essential. Oil and gas transmission systems utilize these pipes for gathering lines, trunk lines, and distribution networks operating at elevated pressures.

For petrochemical plants, process pipework that carries hydrocarbons, chemicals and intermediate products at variable temperatures is specified as grade CC70. The material's low temperature capabilities make it appropriate for refrigeration systems and cryogenic service applications.

These pipes are used in steam systems, cooling water circuits and auxiliary piping networks of power production facilities. Strength and weldability merge to accommodate complicated pipe systems with various branch outputs and connections.

The product is used in compressed air systems, hydraulic circuits and transport of process fluids in industrial facilities of all manufacturing sectors. Thermal cycling resistance. The material may be used in equipment with high frequency of temperature changes, which increases lifetime of the parts.

Value-Added Fabrication and Coating Services

Beyond pipe manufacturing, Longma Group offers fabrication services that prepare your materials for direct installation. Our capabilities include welding for spool fabrication, end preparation for flange connections, and expansion processing for diameter transitions.

In case corrosion protection is required for your application environment, we use several coating techniques. Hot Dip Galvanising offers long-lasting protection for outdoor use in corrosive environments. Fusion Bonded Epoxy (FBE) coating provides good adhesion and chemical resistance for subterranean pipes.

We use two-layer polypropylene (2PP), three-layer polyethylene (3LPE) or three-layer polypropylene (3PP) coating solutions for better protection. These multi-layer barriers are impervious to moisture, soil stress and electrochemical corrosion.

Surface preparation is performed prior to coating application to ensure best adherence and coating performance. Consistent outcomes across manufacturing batches may be achieved by using controlled environment coating facilities.

Supply Chain Reliability and Global Delivery

Longma Group has manufacturing capacity of about 1,000,000 tons per year and availability of inventories for standard product standards. We provide our quickest delivery time of 7 days for standard sizes so that you can keep up with tight project deadlines.

For particular measurements, special tests or special coatings required by the customer, our production planning department will organise the manufacturing sequences according to the delivery schedules. The size of our plant is 230,000 square metres, which allows us to produce many orders simultaneously. Yet we are still able to deliver on time, even in high demand periods.

Our logistics expertise is built on our export experience in over 90+ countries. We handle container loading for lower amounts. For high project volumes we transport via bulk vessel. Our documentation team generates all shipment paperwork necessary for customs clearance, such as commercial invoices, packing lists, certificates of origin and quality documents.

FAQ

Q：Why is the product a preferred choice for demanding low-temperature pressure applications?

A：The product combines higher mechanical strength with reliable low-temperature toughness. The CC70 grade offers tensile strength of 70 ksi compared to lower grades, making it suitable for elevated pressure systems. The material's fine-grain structure and controlled chemistry provide good impact resistance, reducing brittle failure risks in cold service. For large-diameter applications where seamless pipe production faces limitations, the electric fusion welding process delivers pressure vessel grade performance with cost advantages. These characteristics make CC70 particularly valuable in LNG facilities, outdoor pipeline systems in cold regions, and petrochemical plants requiring both strength and low-temperature capability.

Q：What quality controls should buyers require for the products?

A：Comprehensive quality documentation should include Material Test Certificates with complete heat number traceability, chemical composition analysis, and mechanical test results covering yield strength, tensile strength, elongation, and impact values at specified temperatures. Non-destructive examination records, particularly radiographic testing of longitudinal welds, verify weld integrity. Hydrostatic test reports confirm pressure containment capability. Dimensional inspection records document compliance with diameter, wall thickness, and length specifications. For critical applications, request heat treatment records, Positive Material Identification testing, and third-party inspection by recognized organizations. A qualified manufacturer provides full traceability from raw material through finished pipe, supporting both quality assurance and long-term performance documentation.

Q：How can buyers choose the right the product supplier?

A：Evaluate potential suppliers based on manufacturing experience with electric fusion welded pressure vessel grade pipes. Verify their capability to produce your required diameter and wall thickness ranges. Assess their quality management system, including raw material controls, welding procedure qualifications, inspection equipment, and traceability systems. Review their production capacity and delivery performance history to ensure schedule reliability. Technical communication capability matters—your supplier should understand project specifications and provide expert guidance on material selection, testing requirements, and application considerations. Request references from similar projects and verify certifications including ISO 9001 and relevant industry standards. A qualified supplier delivers more than compliant pipes; they provide partnership support throughout your project lifecycle.

Contact Us

Our technical team at Longma Group provides expert guidance on ASTM A671 CC70 Pipe selection, testing requirements, and delivery solutions. Contact us at info@longma-group.com to receive detailed quotations and technical support tailored to your application needs.