316 Square Tube, TP316L Stainless Steel Square Tube, Polished 316L Square Tube In Stock
Stainless steel square tubes are hollow long strips of steel, named as such because their cross-section is square. They are extensively used for piping fluids such as oil, natural gas, water, coal gas, steam, etc. Additionally, due to their lighter weight while maintaining equal bending and torsional strength, they are also employed in the manufacturing of mechanical parts and engineering structures [1].
Categories
Stainless Steel Square Pipe Categories: Square pipes are divided into two main types: seamless steel pipes and welded steel pipes (seamed pipes). They can also be categorized by cross-sectional shape, including square and rectangular pipes. Circular steel pipes are commonly used, but there are also various shapes such as semi-circular, hexagonal, equilateral triangular, octagonal, and others.
All stainless steel square tubes subjected to fluid pressure must undergo hydrostatic testing to verify their pressure resistance and quality. Non-leakage, non-wetting, and no expansion under specified pressure are considered合格. Some steel tubes also require edge rolling tests, expansion tests, flattening tests, etc., based on standards or customer requirements.
Square tube specifications: 5*5~150*150 mm, thickness: 0.4~6.0 mm
Square tube material: 304, 304L, TP304, TP316L, 316, 316L, 316Ti, 321, 347H, 310S [1].
Production Process
Round steel preparation → Heating → Hot rolling piercing → Cutting → Washing → Grinding → Lubricating → Cold rolling processing → Degreasing → Solid solution heat treatment → Straightening → Tube cutting → Washing → Final 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 create holes. This can be prevented by painting or electroplating with oxygen-resistant metals to protect the carbon steel surface; however, this protective layer is merely a thin film. If it is damaged, rusting beneath will resume. The corrosion resistance of stainless steel pipes is related to the chromium content in the steel. When the chromium content reaches 12%, a passivated, dense, chromium-rich oxide layer forms on the surface of the stainless steel pipe 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 reform a passivating layer, continuing to provide protection. In certain special environments, stainless steel can also experience localized corrosion and fail, unlike carbon steel, which does not exhibit uniform corrosion and failure. Therefore, the corrosion reserve is not meaningful for stainless steel pipes.
Our company specializes in steel grades including 200, 201, 304, 304L, 321, 321H, 316L, 316Ti, 310S, 317L, 410, 444, 904L, and 2205, adhering 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) specifications, and Russian (GOST) specifications. We are a comprehensive enterprise integrating production, research, processing, and sales, with a focus on producing stainless steel seamless tubes, square and rectangular tubes, high-pressure boiler tubes, welded tubes, 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 special equipment manufacturing licenses. We possess advanced testing equipment and relevant testing technologies, including optical emission spectrometry for chemical composition analysis, X-ray, ultrasonic, and liquid penetrant testing for non-destructive testing, hardness testing with hardness gauges, and wall thickness measurement with thickness gauges. 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, by phone, email, or online.
