(1) Manufacturing Method: 304 stainless steel tubes are made from acid-resistant stainless steel, specifically 304 stainless steel. These tubes are manufactured using various techniques such as rolling, hot extrusion, and cold drawing. The production process is similar to that of seamless steel pipes. According to the standard GB 14975-94 titled "Stainless Steel Seamless Pipes," materials like 1Cr13, 2Cr13, 3Cr13, 1Cr17Ni2, 1Cr21Ni5Ti, 00Cr18Ni10, 1Cr18Ni9, 1Cr18Ni9Ti, 00Cr17Ni14Mo2, 0Cr18Ni12Mo2Ti, 1Cr18Ni12Mo3Ti, 1Cr23Ni18, and 1Cr18Ni11Nb are commonly used. These steels are known for their resistance to corrosion and are difficult to deform during processing. (2) Applications: 304 stainless steel pipes are widely used in industries such as petroleum, chemical, and construction. They are suitable for pipelines, structural components, and parts where maintaining chemical composition and physical properties is essential. Types of Stainless Steel Tubes: There are two main types of stainless steel tubes: those produced through hot rolling, hot extrusion, and cold drawing (rolling). These can be classified into different categories, including semi-iron, semi-martensitic, martensitic, austenitic, and ferritic stainless steel tubes. Specifications and Appearance Quality: (1) According to GB 14975-94, the length of hot-rolled steel pipes is typically between 1.5 to 10 meters, while hot-extruded pipes are usually equal to or longer than 1 meter. Cold-drawn or cold-rolled pipes have wall thicknesses ranging from 0.5 to 1.0 mm with lengths of 1 to 7 meters, and for wall thicknesses over 1.0 mm, the length ranges from 1.5 to 800 mm. (2) For hot-rolled or hot-extruded pipes, the diameter ranges from 45 to 480 mm, with wall thicknesses between 4.5 to 45 mm. For cold-drawn or cold-rolled pipes, the diameter ranges from 6 to 200 mm, with wall thicknesses from 0.5 to 21 mm. (3) The inner and outer surfaces of 304 stainless steel tubes must be free from defects such as cracks, folds, breaks, surface flaws, rolling marks, pressing, separation, and crucible-related issues. Any such defects must be completely removed, except for processed pipes, without reducing the wall thickness below the specified tolerance. Small surface imperfections may be allowed if they do not affect the overall quality. (4) The straightness of the tube should meet certain depth tolerances. For hot-rolled or hot-extruded pipes with a diameter ≤ 140 mm, the maximum allowable depth is 5% of the nominal wall thickness, not exceeding 0.5 mm. For cold-drawn or cold-rolled pipes, it’s 4% of the wall thickness, with a maximum depth of 0.3 mm. (5) The ends of the 304 stainless steel tube should be cut at right angles, and any burrs should be removed to ensure smooth edges. 4. Chemical Composition Testing: The chemical composition of the stainless steel pipes must be tested to ensure they meet the required standards. This includes checking for elements such as chromium, nickel, carbon, and other alloying elements to confirm the material's performance and durability under different conditions. Proper testing guarantees that the final product is safe and suitable for its intended application.
CEPAI Group Co., Ltd. , https://www.jscepai.com