Shanghai ShengQiu Materials Co., Ltd

The Mandatory Nature and Core Role of Seamless Steel Pipe Pickling   Pickling is an indispensable pre-treatment step in the manufacturing of seamless steel pipes , serving as the foundation for guaranteeing product quality and service life.   1.Core Mission and Risk Elimination   The iron oxide scale on the surface of hot-rolled pipes must be removed, otherwise, it leads to multiple risks:   1)Impedes QC: The scale masks surface defects like cracks and hairlines, preventing accurate assessment of the material's true condition. 2)Increases Costs: The hard scale causes severe wear on the dies required for subsequent cold working ( cold drawing/rolling ). 3)Safety Hazard: Residual oxides can become corrosion initiation sites or stress concentration points during use, severely impacting safety and reliability in critical fields like hydraulic systems .   2.Process Enablement and Performance Enhancement   Pickling is espec...

Strengthening Your Supply Chain with Reliable Steel Piping Solutions   In today's volatile market, having a dependable partner for steel pipes is crucial for keeping projects on schedule.   We specialize in supporting the Oil & Gas, Construction, and Energy sectors with high-grade carbon and alloy steel pipes. Whether you need standard line pipes or specialized high-pressure boiler tubes , we ensure quality compliance and timely delivery.   We are ready to support your requirements for: ·        Carbon Steel Pipe: ASTM A106/A53 , DIN2391, EN10216 ·        Line Pipe: API 5L Gr.B, X42, X46, X52, X56, X60, X65 ·        Casing and Tubing: API 5CT Grade H40 / J55/ K55/ N80/ L80/ C90/ T95/ P110/ Q125 ·        Alloy Steel Pipes: ASTM A335 P5/P9/P11/P12/P22/P91/P92; ASTM A519 SAE4130/SAE4140 ·        ...

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...