ASTM A672 A55 Pipe
ASTM A672 A55 Pipe – High-Pressure Electric Fusion Welded Steel Pipe for Industrial Applications
Hebei Longma Group manufactures ASTM A672 A55 Pipe with over 20 years of specialized experience in electric fusion welded pressure piping solutions. Longma has an annual production capacity of more than 1,000,000 tons and a production base of 230,000 square metres. It provides big diameter pressure pipes of 60.3mm-2032mm(2"-80") in diameter and 4mm-100mm in wall thickness. Our product is made from pressure vessel grade steel plate that meets ASTM A516 Grade 55, with tensile strength of 380-515 MPa and minimum yield strength of 205 MPa to provide dependable operation in high pressure industrial systems.
What Is ASTM A672 A55 Pipe
The product under consideration is an electric-fusion-welded carbon steel pipe for high-pressure usage in moderate-temperature conditions. It is made from ASTM A516 Grade 55 pressure vessel grade plate, providing enhanced weld integrity and dimensional precision.
The "A55" mark implies a minimum tensile strength of 55 ksi (380 MPa), making it ideal for severe pressure applications. The electric fusion welding procedure employs submerged arc welding to provide the filler metal and to guaranty deep penetration and uniform quality of the weld.
This pipe form handles important industrial issues when a costly high diameter seamless pipe is prohibitive. You get proven longitudinal weld performance that fulfils ASME Boiler and Pressure Vessel Code standards without compromising economic project feasibility.
Technical Specifications & Material Properties
| Property | Specification |
|---|---|
| Grade | A55 (ASTM A516 Grade 55) |
| Outside Diameter | 60.3-2032mm (2"-80") |
| Wall Thickness | 4mm-100mm |
| Tensile Strength | 380-515 MPa (55-75 ksi) |
| Yield Strength | Min 205 MPa (30 ksi) |
| Elongation | Min 23-27% |
| Carbon Content | 0.18-0.22% max (thickness dependent) |
| Welding Process | Electric Fusion Welding (EFW) with filler metal |
| Delivery Time | As fast as 7 days |
The controlled carbon content ensures excellent weldability and notch toughness. Your pipes feature superior elongation properties that resist brittle fracture in pressurized systems. Class 22 heat treatment options provide 100% radiographic examination and stress relieving for maximum grain refinement.
Manufacturing Process & Quality Control
Longma Group employs advanced electric fusion welding technology to produce product with consistent quality. Our manufacturing process begins with carefully selected pressure vessel grade steel plates from reputable mills including Bao Steel, HBIS, and Shagang.
The EFW process uses submerged arc welding to create robust longitudinal seams with complete penetration. We apply strict heat treatment procedures to eliminate residual welding stresses and enhance material performance.
Our quality management system includes complete traceability from raw material to finished product. Every pipe undergoes rigorous inspection including chemical composition analysis, mechanical testing, hydrostatic pressure testing, and non-destructive examination.
Advanced inspection equipment identifies potential defects before delivery. You receive comprehensive documentation including Material Test Certificates, NDT reports, and dimensional inspection records.
Industrial Applications & Performance Advantages
ASTM A672 A55 Pipe serves critical roles across multiple industrial sectors where pressure reliability is non-negotiable.
In power generation facilities, these pipes handle main steam and feedwater systems. They withstand constant high-pressure cycles without fatigue, ensuring continuous operation. Your power plants benefit from large-bore piping that maintains structural integrity under demanding conditions.
Petrochemical refineries utilize this pipe grade for hydrocarbon processing units. The pressure vessel quality steel ensures safety against internal corrosive pressures. Processing operations continue reliably with piping that meets stringent safety requirements.
Midstream oil and gas operations deploy A55 pipes in compressor stations and manifold headers. Heavy wall thicknesses combined with large diameters enable efficient fluid transport under high-pressure gradients. Your infrastructure gains stability even in challenging geographical locations.
The manufacturing flexibility allows customization for various project specifications. You can specify required diameters, wall thicknesses, and lengths to match exact installation requirements.
Quality Documentation & Compliance
Longma Group provides complete technical documentation supporting international engineering standards. Your purchase includes Material Test Certificates with full heat number traceability, ensuring material authenticity.
We conduct comprehensive mechanical testing covering tensile strength, yield strength, and elongation. Hydrostatic test records verify pressure performance before shipment. Radiographic testing and other non-destructive examinations confirm weld integrity.
Chemical composition analysis validates material compliance with ASTM A516 Grade 55 specifications. Dimensional inspection reports ensure geometric accuracy for field installation.
When your project requires additional verification, we accommodate third-party inspection by agencies including BV, TUV, and Intertek. Heat treatment records, impact testing, and Positive Material Identification are available upon request.
Our quality certifications include API 5L Certificate, ISO9001 Quality Management System, ISO 14001 Environmental Management, and ISO 18001 Occupational Health and Safety Management. These credentials demonstrate our commitment to consistent quality standards.
Value-Added Services & Customization
Beyond manufacturing product, Longma Group offers comprehensive fabrication and protection services. We provide welding, perforating, expansion processing, and specialized end treatments to meet connection requirements.
Our anti-corrosion services extend pipe service life in harsh environments. Choose from hot-dip galvanizing, FBE coating, 2PP coating, 3LPE coating, or 3PE coating based on your operating conditions.
These surface protection options enhance durability and reduce maintenance costs. Your piping systems gain extended operational life with proper corrosion resistance matching environmental exposure.
We understand that project timelines matter. With production capacity exceeding 1,000,000 tons annually, we maintain stable supply capabilities. Our fastest delivery time of 7 days supports urgent project requirements without compromising quality.
FAQ
Q：Can the product be used in sour service environments?
A: Yes, the product may be used in sour service applications if correctly stated. Additional testing to evaluate the resistance of the pipe to Hydrogen Induced Cracking (HIC) and Sulphide Stress Cracking (SSC) is necessary. These tests are performed to NACE MR0175/ISO 15156 requirements for sour service. When ordering for sour service, advise your supplier so that suitable material selection and testing may be undertaken.
Q：What is the meaning of Class 22 classification for ASTM A672 pipes?
A: Class 22 is a particular set of heat treatment and inspection criteria. This class involves 100 % radiographic evaluation of the longitudinal weld seam and post-weld heat treatment (stress relieving). The radiography examination will reveal any internal weld faults and the stress relieving will remove leftover welding tensions and improve the grain structure. Engineers will typically specify Class 22 for sensitive high pressure applications where highest assurance of safety is needed. This rating represents the highest level of quality verification for pressure pipe systems.
Q：How does ASTM A672 differ from ASTM A671 pipe?
A：The primary difference lies in the intended service temperature range. ASTM A672 is designed for high-pressure service at moderate temperatures, typically in applications where elevated operating temperatures are expected. ASTM A671 is intended for atmospheric and lower temperature applications. Both use electric fusion welding, but A672 specifications account for the additional thermal stresses present in moderate-temperature pressure systems. Your application's temperature and pressure parameters determine which specification is appropriate.
Contact Us
Ready to source reliable ASTM A672 A55 Pipe for your project? Hebei Longma Group delivers proven quality backed by 20 years of manufacturing expertise. Contact our team at info@longma-group.com for technical specifications, custom fabrication options, and competitive quotations.
