In engineering material selection and procurement, S235JR and S275JR are commonly used non-alloy structural steels defined in EN 10025-2. At first glance, they seem similar in application, but they differ clearly in strength grade, chemical composition limits, mechanical properties, and inspection requirements—differences that directly impact structural safety, weldability, and low-temperature performance, determining whether they can be considered “equivalent alternatives.” Key Performance Comparison at a Glance   Parameter S235JR S275JR Nominal minimum yield strength 235 MPa 275 MPa Tensile strength Rm (typical range) ~360–510…

In engineering procurement and structural design, one of the most frequently asked questions is:Can the European standard steel S235JR (EN 10025-2) be interchanged with the American standard ASTM A36? The short answer: They are similar in most general structural applications, but not strictly identical. There are key differences in mechanical properties, delivery conditions, and impact toughness requirements, which must be verified through testing and certification to minimize procurement risk. Differences in Standards and Definitions S235JR (EN 10025-2) Non-alloy structural steel with a…

With global investments in energy and infrastructure rebounding, astm a691 alloy steel pipes are experiencing a steady surge in demand due to their superior performance under high-temperature and high-pressure conditions. As a manufacturer with over 20 years of industry experience, LONGMA not only provides high-quality products such as astm a691 grade 2.1 4cr, but also ensures risk-free procurement through its advanced in-house testing laboratory and traceable quality control system. This article analyzes the market dynamics, industrial applications, inspection requirements, and procurement strategies of ASTM A691…

In refinery and natural gas transmission projects, material selection directly determines the system’s safety, operational reliability, and lifecycle cost. With over 20 years of manufacturing experience, LONGMA has successfully supplied astm a691 alloy steel pipes to numerous large-scale projects, proving their exceptional performance in high-temperature, high-pressure, and corrosive service environments. This article analyzes real-world applications, technical comparisons, inspection methods, and procurement control measures to help engineers and buyers make informed decisions — while reinforcing LONGMA’s credibility as a trusted supplier. Typical Engineering Case…

In the refining, petrochemical, and power generation industries, welding quality and post weld heat treatment (PWHT) are critical factors affecting the long-term safety and performance of astm a691 alloy steel pipes. With over 20 years of manufacturing and quality control experience, LONGMA provides a detailed explanation of ASTM A691 welding and PWHT requirements, offering practical guidance for engineers and procurement teams to ensure compliance and reduce project risks. Key Standards and Technical Basis ASTM A691– Specifies the manufacturing, heat treatment, and inspection requirements for…

In industries such as refining, petrochemical, and power generation, pipelines operate under extreme temperature and pressure conditions. Choosing the right pipe material is not just a matter of performance — it’s a matter of safety, reliability, and long-term cost efficiency. Among various alloy steels, ASTM A691 alloy steel pipes stand out for their exceptional strength, heat resistance, and durability, making them the first choice for critical applications. As a manufacturer with more than 20 years of industry experience, LONGMA provides a full…

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,…