As a steel pipe manufacturer and quality control expert with over 20 years of experience in the refining and petrochemical industries, LONGMA provides a comprehensive analysis of ASTM A691 (Electric-Fusion-Welded Alloy Steel Pipes) and the commonly used P-Grades (P1, P5, P9, P22) — covering industrial applications, inspection methods, and procurement risk management. This article uses comparative tables to help engineers, buyers, and project managers make accurate decisions quickly. Overview of P-Grades (Why Focus on P1, P5, P9, and P22) The “P-Grades” (commonly seen…

In refinery and petrochemical applications, pipelines are often exposed to high temperature, high pressure, and corrosive media. Selecting the right material directly affects equipment safety, service life, and long-term maintenance costs. Among various options, ASTM A691 electric-fusion-welded alloy steel pipes stand out for their excellent high-temperature strength, oxidation resistance, and mechanical stability, making them ideal for use in heaters, heat exchangers, and steam pipelines. Overview of ASTM A691 Standard   Item Details Standard Name ASTM A691 – Standard Specification for Carbon…

In the global alloy steel pipe market, ASTM A691 and ASTM A335 are two of the most widely used standards for high-temperature and high-pressure service. Both are essential in industries such as power generation, petrochemicals, refineries, and energy transportation. While they share similarities in alloy composition and mechanical properties, their manufacturing process, application fields, and performance standards differ significantly. This article provides an in-depth comparison between ASTM A691 and ASTM A335 to help buyers make an informed choice—while showcasing the quality and expertise of…

As global energy and industrial projects continue to expand, ASTM A672 steel pipes have become one of the most demanded welded pipe products in the international market.Known for their high strength, weld integrity, and adaptability under pressure, ASTM A672 pipes are widely used in oil and gas pipelines, power generation, and water transport systems. With over 20 years of manufacturing experience, LONGMA has positioned itself as a reliable China ASTM A672 exporter, supplying high-performance ASTM A672 pipe products to customers in Asia,…

In industrial pipeline design—especially for high-pressure steam, water, and oil transport systems—selecting the correct material grade is crucial for safety, efficiency, and cost-effectiveness. The ASTM A672 specification provides a comprehensive standard for Electric Fusion Welded (EFW) steel pipes used in moderate to high-temperature service applications. With over 20 years of experience in steel pipe manufacturing, LONGMA has helped global clients determine the most suitable ASTM A672 pipe grades for their operating environments. This article explores how to select the right grade based on pressure,…

Introduction: The Trusted Solution forHigh-Pressure Environments With the global expansion of energy infrastructure, LNG (Liquefied Natural Gas) terminals and refinery plants demand pipeline systems that can withstand high pressure, elevated temperatures, and corrosive media. These environments place extreme requirements on material integrity, welding quality, and inspection standards. Among various steel pipe materials, ASTM A672 pipe has become a preferred choice due to its excellent mechanical strength, weldability, and pressure-grade versatility. With over 20 years of experience, LONGMA Steel Pipe Factory has provided advanced Electric…

As one of the most widely used electric fusion welded (EFW) carbon steel pipes, ASTM A672 pipe is essential for high-pressure applications in oil, gas, and power generation industries. However, during manufacturing, improper control of welding parameters, raw material quality, or heat treatment can lead to defects that affect the pipe’s strength, reliability, and compliance with the ASTM A672 specification. This article provides an in-depth analysis of the common defects found in ASTM A672, their causes, testing standards, and preventive measures…

In high-pressure water, steam, and oil transmission systems, ASTM A672 steel pipes are widely used due to their excellent weldability, mechanical strength, and consistent performance under pressure. For such critical applications, ensuring that each pipe is free from cracks, inclusions, or porosity is essential to system safety and reliability. That’s why all ASTM A672 material must undergo rigorous Non-Destructive Testing (NDT) procedures before shipment to verify both weld and base metal integrity. This article introduces the major NDT methods for ASTM A672 pipes,…

In modern power plants, refineries, and industrial facilities, the demand for reliable high-pressure piping is greater than ever. Whether transporting superheated steam or high-pressure water, the material must withstand extreme temperature, internal stress, and corrosion. Among the available materials, ASTM A672 pipe has become one of the most trusted choices worldwide for high-pressure water and steam lines. With over 20 years of manufacturing experience, LONGMA Steel Pipe has built a strong reputation as a China ASTM A672 exporter, producing high-quality ASTM A672 C60,…

In modern power plants, petrochemical systems, and high-pressure steam pipelines, ASTM A672 steel pipes are widely used for their excellent mechanical strength, weld integrity, and reliability. Among these, Grades C60, C65, and C70 are the most common materials under the ASTM A672 standard, each offering distinct advantages in strength, temperature tolerance, and cost-efficiency. This article explores the key performance differences between these grades, providing engineers and procurement professionals with data-driven insights for selecting the right material. Overview of the ASTM A672 Standard…

In today’s era of rapid infrastructure and energy development, ASTM A672 welded steel pipes have become a key component in oil, gas, chemical, and power projects due to their exceptional strength, weldability, and pressure resistance. As a manufacturer with over 20 years of experience, LONGMA strictly adheres to international standards and employs advanced manufacturing and testing technologies to ensure that every ASTM A672 pipe meets or exceeds performance requirements in strength, toughness, and corrosion resistance. Overview of ASTM A672 Standard and Material…

In today’s highly competitive global infrastructure market, ASTM A671 steel pipes have become a trusted choice for high-pressure and high-temperature applications, especially in power plants, refineries, and long-distance oil and gas transmission systems. With over two decades of manufacturing expertise, LONGMA is committed to producing ASTM A671 EFW pipes that meet international standards and deliver exceptional reliability. This article provides an in-depth look into the entire production and quality assurance process of ASTM A671 steel pipes—from raw steel selection to final inspection—and…

In the global landscape of energy transmission and large-scale infrastructure, ASTM A671 steel pipes have become indispensable due to their excellent weldability, high-temperature strength, and pressure resistance. From transcontinental oil and gas pipelines to ultra-supercritical power plants, ASTM A671 pipes play a crucial role in ensuring the safety, efficiency, and reliability of the world’s most demanding engineering projects. Overview of ASTM A671 Standard and Its Applications ASTM A671 is a specification issued by the American Society for Testing and Materials (ASTM) for…

In modern industrial applications, ASTM A671 EFW pipes are widely recognized for their excellent mechanical strength, corrosion resistance, and high-quality welding performance. They are the preferred material in energy, chemical, and power generation industries. With over 20 years of experience, LONGMA has become a trusted global manufacturer by leveraging advanced technology, strict quality control, and a deep understanding of the ASTM A671 material standard. This article takes you inside LONGMA’s production process — exploring how advanced manufacturing and testing techniques ensure the reliability…

Overview of ASTM A671 Standard ASTM A671 is a specification developed by the American Society for Testing and Materials (ASTM) for Electric Fusion Welded (EFW) carbon steel pipes intended for pressure service at low to moderate temperatures. These pipes are widely used in petrochemical plants, natural gas pipelines, and power generation systems. Compared with seamless pipes, the ASTM A671 EFW pipe offers excellent weld quality, consistent mechanical strength, and greater cost efficiency, making it a popular choice in global infrastructure and energy projects.…