ASTM A671 CB70 Pipe
ASTM A671 CB70 Pipe for High-Pressure Service Applications – Reliable EFW Carbon Steel Solution
Hebei Longma Group manufactures ASTM A671 CB70 Pipe using electric-fusion-welding (EFW) technology from pressure vessel quality carbon steel plate conforming to ASTM A516 Grade 70. Longma has more than 20 years of specialised production expertise and annual production capacity of over 1,000,000 tons, providing high strength and big diameter pipe solutions for oil & gas, petrochemical and power generation sectors. The product has good low temperature toughness and mechanical qualities. The tensile strength is 485 to 620 MPa, and the yield strength is not less than 260 MPa. We provide our pipes with outer diameters ranging from 60.3mm to 2032mm and a wall thickness of 4mm to 100mm, with full traceability and thorough technical documentation.
Understanding CB70 Grade in Pressure Piping Systems
The term CB70 means carbon steel pipe made from ASTM A516 Grade 70 plate material. This special grade is intended for pressure vessel applications where greater strength and dependability is required.
CB70 differs from traditional structural steel pipes in that it offers superior tensile performance and consistent mechanical characteristics over thick wall sections. During the electric-fusion-welding process, the stability of the weld integrity is guarantyd in the pipe body.
In applications where pipe systems must withstand high internal pressures or function in difficult industrial conditions, CB70 provides real performance benefits to purchasers. You get a product that satisfies your demanding pressure service needs, without sacrificing weldability or manufacturing efficiency.
Technical Specifications of ASTM A671 CB70 Pipe
| Parameter | Specification |
|---|---|
| Standard | ASTM A671 |
| Grade | CB70 (ASTM A516 Grade 70) |
| Outside Diameter | 60.3mm – 2032mm (2" – 80") |
| Wall Thickness | 4mm – 100mm |
| Tensile Strength | 485 – 620 MPa (70 – 90 ksi) |
| Yield Strength | ≥ 260 MPa (38 ksi minimum) |
| Manufacturing Process | Electric Fusion Welding (EFW) |
| Heat Treatment Options | Class 12, 22, 32 (per project requirement) |
| Delivery Time | From 7 days |
This specification range enables you to match pipe dimensions precisely to your engineering calculations and project design parameters.
Why Choose Electric Fusion Welded Construction
Electric fusion welding is advantageous for large-diameter, heavy-wall pressure pipelines. The procedure employs controlled application of heat to weld longitudinal seams, thereby ensuring uniform weld quality over the full length of the pipe.
EFW may be used to economically produce greater diameters and heavier wall thicknesses than can be made via seamless fabrication. You overcome the dimensions constraints and extra cost of seamless solutions and retain code compliant structural integrity.
In our production facilities, we use certified welding processes and competent technical experts to guarantee that each weld fulfils ASTM criteria. Post-weld heat treatment options are available to meet your required class designation, further boosting material toughness and stress reduction.
Quality Assurance Complete Protocol
Longma Group implements tight quality control for every manufacturing process. Raw materials are supplied by leading Chinese steel mills like Shagang, TISCO and Bao Steel, assuring stable chemical composition and mechanical qualities.
Each ASTM A671 CB70 Pipe undergoes rigorous testing including hydrostatic pressure testing, non-destructive examination through radiographic or ultrasonic testing, and dimensional verification. You receive complete documentation packages containing:
Material Test Certificates with full heat traceability, chemical composition analysis, mechanical test reports showing yield strength and tensile strength values, weld examination records, and dimensional inspection certificates. Third-party inspection services from BV, TUV, or Intertek can be arranged according to your project requirements.
Our ISO9001, ISO14001, and API 5L certifications demonstrate our commitment to internationally recognized quality management standards.
Application Engineering Support
CB70 pipes are important in petroleum refining, chemical processing plants, power production facilities, and industrial gas distribution networks. The material provides outstanding weldability for field fabrication and modification via the balanced carbon content and regulated alloying.
If your project calls for impact testing at specified temperatures, positive material identification or special length arrangements, our technical staff will work with you to provide compliance solutions. We recognise that pressure pipe projects have complicated approval procedures and safety concerns.
In addition to pipe production, Longma provides value-added services like as bevelling, test plugging, coating application (FBE, 3LPE, 3PE) and custom labelling. These services help simplify your supply chain and decrease complexity on your project timelines.
Global Supply Capability Local Support
Longma has industrial facilities of 230,000 square metres and goods in over 90 countries, providing large-scale production capability with flexible client service. With an annual production of over one million tons, we can guaranty a reliable supply of material, even for multi-phase projects with planned delivery.
Whether you represent an engineering contractor, steel distributor, or end-user industrial facility, you benefit from our established logistics network and export documentation expertise. We provide the commercial and technical support necessary for smooth international procurement.
FAQ
Q：What makes CB70 different from CB60 or CB65 grades?
A：CB70 utilizes ASTM A516 Grade 70 base plate, providing higher minimum tensile strength compared to Grade 60 or 65. This translates to improved pressure-handling capability and greater structural margin for demanding applications.
Q：Can you provide pipes with 100% radiographic examination?
A：Yes. Class 22 and Class 32 designations include complete radiographic testing of all welds. We match inspection requirements to your project specifications and applicable codes.
Q：How do you ensure traceability from plate to finished pipe?
A：Every production lot receives unique identification linking raw material heat numbers through all manufacturing stages. This information appears on Material Test Certificates and pipe markings, enabling full backward traceability.
Q：What is your typical production lead time for the product?
A：Standard specifications can be fulfilled in as little as seven days depending on size and quantity. Custom requirements involving special testing or heat treatment may require extended scheduling, which our sales team will communicate clearly during order processing.
Q：Do you offer technical consultation for material selection?
A：Absolutely. Our engineering staff can review your pressure, temperature, and service conditions to confirm CB70 suitability or recommend alternative specifications if appropriate. We view ourselves as your technical partner, not just a pipe supplier.
Contact Us
Hebei Longma Group stands ready to support your pressure piping requirements with reliable ASTM A671 CB70 Pipe manufactured to exacting standards. Contact our team at info@longma-group.com to discuss specifications, request quotations, or arrange mill inspection visits.
