When sourcing high-quality tubular products for industrial, structural, or mechanical applications, Steel Pipes and Tubes from YS STEEL offer a reliable combination of strength, precision, and durability. Our inventory includes a broad spectrum of round, square, rectangular, and specialty profiles designed to meet ASTM, ASME, API, EN, and JIS standards. This page details the key product parameters, material grades, testing methods, and frequently asked questions to help engineers, procurement managers, and fabricators make informed decisions.
YS STEEL supplies Steel Pipes and Tubes in two primary categories: seamless and welded. Seamless pipes are produced by piercing a solid billet and then rolling or drawing it to the required dimensions. Welded pipes are manufactured by forming steel strip or plate into a cylindrical shape and welding the seam using electric resistance welding (ERW), longitudinal submerged arc welding (LSAW), or spiral submerged arc welding (SSAW). Each manufacturing method delivers distinct advantages depending on pressure rating, dimensional accuracy, and cost efficiency.
Material options include carbon steel, stainless steel, alloy steel, duplex stainless steel, and nickel alloys. These materials can be further customized with different end finishes, surface treatments, and mechanical properties. YS STEEL maintains a large stock of standard sizes and offers rapid mill-order production for non-standard specifications.
YS STEEL follows a tightly controlled production workflow for all Steel Pipes and Tubes. The process begins with raw material verification and chemical composition analysis to ensure the incoming steel meets the required grade. For seamless pipes, the heated billet is pierced, elongated, and sized through a mandrel mill or plug mill. For welded pipes, the strip or plate is formed through a series of rollers and welded using high-frequency induction or submerged arc welding. After welding, the weld seam is heat-treated to relieve residual stress and improve toughness.
Quality control measures include:
All products are supplied with a detailed Mill Test Certificate that records heat number, chemical composition, mechanical properties, test results, and dimensional compliance. YS STEEL also supports third-party inspection by organizations such as SGS, BV, TUV, and ABS upon request.
Steel Pipes and Tubes from YS STEEL are used in a wide range of industries because of their dependable performance under high pressure, high temperature, and corrosive environments. Typical applications include:
A steel pipe is generally specified by its nominal pipe size (NPS) and schedule, which define the outer diameter and wall thickness. Pipes are used primarily for transporting fluids and gases under pressure. A steel tube is specified by its exact outer diameter, inner diameter, and wall thickness in inches or millimeters. Tubes are often used in structural, mechanical, and precision applications where tighter dimensional tolerances are required. At YS STEEL, both pipe and tube products are manufactured to strict dimensional and mechanical standards, and the choice depends on the intended service conditions.
Seamless pipes are preferred for high-pressure, high-temperature, and critical applications because they have no weld seam and offer uniform strength around the circumference. Welded pipes are more cost-effective for low-to-medium pressure applications and can be produced in longer lengths and larger diameters. For a given outer diameter and wall thickness, welded pipe often has tighter wall thickness tolerance and better surface finish than seamless. YS STEEL recommends seamless for boiler tubes, heat exchanger tubes, and high-pressure process lines, while welded options are ideal for structural piling, water lines, and standard industrial piping. Our engineers can help you evaluate the working pressure, temperature, corrosion allowance, and budget to select the right product.
YS STEEL products comply with a wide range of international standards including ASTM A53, ASTM A106, ASTM A312, ASTM A335, ASTM A358, ASTM A790, ASTM A928, API 5L, EN 10210, EN 10216, EN 10217, JIS G3454, JIS G3459, and JIS G3463. Each standard specifies chemical composition, mechanical properties, dimensional tolerances, testing methods, and marking requirements. We also supply products that meet project-specific standards from NACE, ASME, PED, and DNV. The applicable standard is printed on the pipe marking and referenced in the Mill Test Certificate, so you can verify compliance before shipment.
Yes. YS STEEL offers extensive customization for Steel Pipes and Tubes. We can produce non-standard outer diameters, wall thicknesses, and lengths through our mill partners. Common surface treatments include black painting, anti-rust oil, hot-dip galvanizing, 3-layer polyethylene coating, fusion-bonded epoxy coating, and pickling with passivation for stainless steel. End finishes can be plain, beveled, threaded, grooved, or flanged according to your connection type. We also provide cutting to exact lengths, chamfering, weld prepping, and protective end caps. For large projects, we can arrange on-site coating and welding services through our approved subcontractors.
Every batch of Steel Pipes and Tubes from YS STEEL undergoes a comprehensive inspection plan. We perform visual and dimensional checks on 100% of the products. Hydrostatic testing is conducted at pressures calculated from the specified wall thickness and grade. Additional non-destructive testing such as ultrasonic, eddy current, or radiographic inspection is available for critical applications. Mechanical tests include tensile, yield, elongation, hardness, and impact toughness. Chemical analysis is performed on each heat of steel to verify element composition. All test results are documented in a traceable Mill Test Certificate that matches the heat number and product markings.
