Processed 310S stainless steel square tubes, brushed 2520 stainless steel square tubes, available for custom processing.
Stainless steel square tubes are hollow long strips of steel, named as such because their cross-section is square. They are extensively used for conveying fluids such as oil, natural gas, water, coal gas, steam, etc. Additionally, due to their lighter weight while maintaining the same bending and torsional strength, they are also employed in the manufacturing of mechanical parts and engineering structures [1].
Categories
Stainless Steel Square Tube Categories: Square tubes are divided into two main types: seamless steel tubes and welded steel tubes (seamed tubes). They can also be classified by cross-sectional shape, including square and rectangular tubes. Circular steel tubes are commonly used, but there are also other shapes like semi-circular, hexagonal, equilateral triangular, and octagonal tubes.
All stainless steel square tubes subject to fluid pressure must undergo hydrostatic testing to verify their pressure resistance and quality. No leakage, wetting, or expansion under the specified pressure is considered合格. Some steel tubes also require edge rolling, expansion, flattening tests, etc., based on standards or customer requirements.
Square tube specifications: 5*5~150*150 mm, thickness: 0.4~6.0 mm
Material: 304, 304L, TP304, TP316L, 316, 316L, 316Ti, 321, 347H, 310S [1].
Production Process
Round steel preparation → heating → hot rolling piercing → cutting heads → washing → polishing → lubrication → cold rolling processing → degreasing → solid solution heat treatment → straightening → cutting into tubes → washing → finished product inspection.
Performance Analysis
Metals can react with oxygen in the atmosphere to form an oxide layer on the surface. The iron oxide formed on ordinary carbon steel continues to oxidize, causing rust to spread and form holes. This can be prevented by painting the surface or electroplating with corrosion-resistant metals. However, this protective layer is only a thin film, and if it's damaged, the steel beneath will start to rust again. The corrosion resistance of stainless steel tubes is related to the chromium content in the steel. When the chromium content reaches 12%, a passive, dense chromium oxide layer forms on the surface of the stainless steel tube in the atmosphere, protecting it from further oxidation. This oxide layer is extremely thin, allowing the natural luster of the steel surface to be seen through it, giving stainless steel its unique finish. If the chromium layer is damaged, the chromium in the steel reacts with oxygen in the atmosphere to form a new passive layer, continuing to provide protection. In some special environments, stainless steel may experience localized corrosion and fail, but unlike carbon steel, it does not undergo uniform corrosion and failure. Therefore, the corrosion allowance is not significant for stainless steel tubes.
Our company specializes in steel grades including 200, 201, 304, 304L, 321, 321H, 316L, 316Ti, 310S, 317L, 410, 444, 904L, and 2205, and adheres to standards such as GB/T14976-2012, GB/T14976-2002, GB/T13296-2007, GB9948-2006, GB5310-2008, ASTM A312, ASTM 213, ASTM A269, ASTM A511, ASTM A789, ASTM A790, JIS3463, JIS3459, DIN2462, DIN17458, DIN17456, EN10216-5, European (EN), and Russian (GOST) specifications. We are a comprehensive enterprise integrating production, research, processing, and sales, focusing on the production of stainless steel seamless pipes, square and rectangular tubes, high-pressure boiler pipes, welded pipes, hygienic stainless steel pipes, valves, and fittings. Our products are used in chemical, petrochemical, power, environmental protection, manufacturing, general fluid transportation, bridge pile driving, infrastructure projects, and more. Headquartered in Longwan District, Wenzhou City, Zhejiang Province, we have obtained a special equipment manufacturing license. We possess advanced testing equipment and relevant testing technologies, including optical emission spectrometry for chemical composition analysis, X-ray, ultrasonic, liquid penetrant testing for non-destructive testing, hardness testers for hardness testing, and thickness gauges for wall thickness measurement. We maintain an inventory of approximately 500 tons of standard and non-standard finished products in various materials, providing fair and reasonable prices for urgent customers. We welcome both domestic and international traders, new and old customers, to negotiate trade, exchange cooperation through visits, phone calls, or online communication.
