Shanghai ShengQiu Materials Co., Ltd

How to choose the appropriate hot-rolled seamless steel pipe and cold-drawn seamless steel pipe?   Selecting the appropriate seamless steel pipe —either hot-rolled (HR) or cold-drawn (CD) —is critical for industrial project success. These two main production methods yield pipes with distinct characteristics suited for specific applications.   1.Essential differences between hot-rolled and cold-drawn processes Hot-rolled seamless steel pipes are formed at high temperatures (typically above the recrystallization temperature) through processes such as piercing and rolling. Pipes produced by this process have the following characteristics: a wide range of sizes (outer diameter can reach hundreds of millimeters), high production efficiency, and relatively low cost, but they have a higher surface roughness and poorer dimensional accuracy. Cold-drawn seamless steel pipes are formed at room temperature by drawing through a die, often involving multiple passes and interm...

Alloy Steel Pipe ： Specifications and Grades   ASTM A213, Grade T5/ T9/ T11/ T12/ T22/ T91 ASTM A335, Grade P5/ P9/ P11/ P12/ P22/ P91 ASTM A519 SAE4130/SAE4140 ASTM A334 Gr.1/ Gr.3/ Gr.6  ASTM A333 Gr.6 EN10216-2 , Grade P235GH/P265GH DIN2391 ST52 DIN 17175   For reliable, high-specification alloy steel pipes, contact us today to start your next project.   Shanghai ShengQiu Materials Co., Ltd WhatsApp: 008613761124029 Email: sales@sqsteelpipe.com Website: www.sqsteelpipe.com  

Why is Non-Destructive Testing (NDT) performed on seamless steel pipes ? What is the difference between ultrasonic testing and eddy current testing?   Non-Destructive Testing (NDT) is essential for seamless steel pipes, acting as a crucial safety and quality assurance measure. It detects manufacturing flaws (e.g., cracks, inclusions, pores, folds ) that threaten mechanical integrity and can lead to catastrophic failure in critical, high-stress applications (like boiler or hydraulic tubes ).   1. Method Comparison and Selection The two main NDT methods, Ultrasonic Testing (UT) and Eddy Current Testing (ECT), are differentiated by their principles and optimal use cases:   1) Ultrasonic Testing (UT) •       Principle: Uses high-frequency sound waves . Defects reflect the waves, allowing accurate determination of location, size, and nature. •       Strengths: High inspection depth, high sensitivity, accurate...

Why can seamless steel pipes withstand higher pressure?   In modern industrial applications, seamless steel pipes are highly favored for their outstanding pressure resistance . The ability of this specialized piping material to withstand higher pressures is rooted in precise principles of materials science and advanced manufacturing processes . A deeper understanding of the pressure resistance mechanism of seamless steel pipes helps us to better select and utilize this high-quality piping material.   1.Inherent Advantage of Structural Integrity Seamless steel pipes are formed in a single operation by piercing and rolling a round steel billet , resulting in a tube body without any welds. This continuous and uniform metal structure avoids defects such as organizational inhomogeneity and stress concentration that are present in welded pipes due to the existence of a weld seam. When subjected to internal pressure, the stress distribution in seamless steel pipes is much...

Seamless Steel Pipe Manufacturing: Hot Rolling vs. Cold Drawing   In the industrial materials sector, "seamless" specifically denotes a manufacturing process for seamless steel tubes , which are produced by directly piercing and rolling a solid round steel billet, entirely excluding any welding steps. This distinct fabrication technique imparts the tube with a continuous and uniform microstructure and consistent mechanical properties, establishing it as a critical, irreplaceable material for high-pressure, high-temperature service conditions.   This article delves into the two primary manufacturing methods for seamless steel pipes, hot rolling and cold drawing , unveiling the intricacies behind this vital industrial material.   Hot Rolling Process: The Art of High-Temperature Forming Hot rolling is the most traditional manufacturing process for seamless steel pipes. Its core procedure involves piercing and rolling a solid round billet at high temperatures, ...

  How is API 5CT Steel Pipe Used? The uses of API 5CT pipe must be explained according to its two main categories ( Casing and Tubing ). They play distinct but complementary roles in the drilling and production process.   1. Uses of Oil Casing   Casing is the pipe string that is run into the wellbore and cemented in place to support the well wall and protect the drilling process. Depending on the drilling depth and geological conditions, multiple layers (or strings) of casing are typically used.   ·        Surface Casing (Conductor/Surface String): o    Use: This is the first casing string run into the well. Its primary purpose is to isolate shallow freshwater zones, preventing their contamination by drilling fluids. It also supports the wellhead equipment and the weight of subsequent casing strings.   ·        Intermediate Casing : o    Use: This string is...