Alloy Seamless Steel Pipes

Production Process

The main production process of hot-rolled seamless steel pipes (main inspection process): Tube blank preparation and inspection → tube blank heating → piercing → tube rolling → steel reheating → fixed (reduced) diameter → heat treatment → finished pipe straightening → finishing → inspection  (non-destructive, physical and chemical, bench inspection) → warehousing.

The main production process of cold-rolled (drawn) seamless steel pipes: Billet preparation → pickling and lubrication → cold rolling (drawing) → heat treatment → straightening → finishing → inspections.

Applications of Seamless Alloy Steel Tube

Seamless Alloy steel tubing finds extensive use across various industries due to its mechanical properties and adaptability. Here are some common applications:Energy & Petrochemical Industry，Machinery Manufacturing & Precision Components，Construction & Infrastructure，Power Generation Industry，Automotive & Shipbuilding Industry ， etc.

Quality Assurance in Seamless Alloy Steel Tube

Certification System:We hold a comprehensive set of certifications to ensure our seamless alloy steel tubes meet global quality and safety standards. Internationally, we are ISO 9001 certified, which validates our robust quality management system, ensuring consistent production processes and reliable product quality. For products destined for the European market, we comply with the CE certification requirements. When the tubes are used in pressure equipment, they meet the Pressure Equipment Directive (PED) 2014/68/EU, guaranteeing safety and compliance in high-pressure applications. In the United States, our products adhere to relevant API (American Petroleum Institute) certifications like API 5L for line pipes and API 5CT for casing and tubing, which are essential for the oil and gas industry. Additionally, we have obtained ASME (American Society of Mechanical Engineers) certifications for tubes used in boiler and pressure vessel applications, ensuring they meet strict design, fabrication, and inspection criteria. Domestically, we also comply with national standards and relevant industry certifications, providing an extra layer of quality assurance.

Inspection Techniques: To ensure the highest quality of our seamless alloy steel tubes, we employ a diverse range of advanced inspection techniques. Non-destructive testing (NDT) methods play a crucial role. Ultrasonic testing (UT) is used to detect internal flaws such as cracks, voids, or inclusions within the tube wall by sending ultrasonic waves through the material and analyzing the reflected signals. Eddy current testing (ECT) is effective in identifying surface and near-surface defects by utilizing electromagnetic induction to detect changes in the material’s electrical conductivity. Magnetic particle inspection (MPI) is applied to ferromagnetic materials to reveal surface and slightly subsurface defects by attracting magnetic particles to the areas of discontinuity. In addition to NDT, we conduct destructive testing, including tensile tests to measure the tube’s strength and ductility, impact tests to assess its resistance to sudden impacts, and hardness tests to determine the material’s resistance to indentation. Chemical analysis is also performed to verify the alloy composition of the tubes, ensuring they meet the specified standards.

Compliance Standards: Our seamless alloy steel tubes comply with a wide array of international and national standards.egular inspections are conducted on the steel pipes, with a qualification rate of 99%.

Industry Experience: With over 10 years of industry experience, we have honed our manufacturing and quality control processes to perfection. Our long-standing presence in the market has allowed us to accumulate in-depth knowledge of material properties, manufacturing techniques, and customer requirements. We have continuously invested in research and development, as well as state-of-the-art manufacturing and inspection equipment. Our team of experienced engineers and technicians, with their profound understanding of the industry, ensures that every step of the production process, from raw material selection to final product inspection, is carried out with the utmost precision. This extensive experience enables us to consistently deliver seamless alloy steel tubes of superior quality, meeting and exceeding the expectations of our global customers.