Stainless steel square pipe is a hollow square section light thin-walled steel pipe, also known as steel refrigeration bending section. It is a section steel with square cross-section shape and size made of Q235 hot-rolled or cold-rolled strip or coil as the base material, which is formed by cold bending and then high-frequency welding. Good comprehensive mechanical properties, good weldability, cold and hot workability and corrosion resistance, and good low-temperature toughness. Stainless steel square tube specifications: 10×10, 12×12, 15×15, 19×19, 20×20, 22×22, 25×25, 30×30, 35×35, 38×38, 50×50, 60×60, 70×70, 75×75, 80× 80, 100×100, 120×120, 150×150, 200×200. Stainless steel square tube material standard: 300 series (301, 304, 304L, 316, 316L, 310S) Standard length of stainless steel square pipe: standard length 6m, can be customized according to order requirements Positive and negative tolerance of stainless steel square tube: outer diameter: ±0.2mm; thickness: ±0.05mm; length ±5mm Stainless steel square tube surface treatment: wire drawing, frosted, polished, 8K, 6K, black titanium, rose gold, black titanium, sapphire blue, etching plating, vacuum plating, water plating. Stainless steel square pipe production standards: ASTM A312, ASTM A554, GB/T12770, JIS G3446 Stainless steel square pipes are used in construction, machinery manufacturing, steel construction and other projects, shipbuilding, solar power generation brackets, steel structure engineering, power engineering, power plants, agricultural and chemical machinery, glass curtain walls, automobile chassis, airports, boiler

We often use magnets to adsorb stainless steel pipes to verify their pros and cons and authenticity. If there is no magnetism, it is considered to be good, and the product is genuine at a fair price; if it is magnetism, it is considered to be a counterfeit. In fact, this is a one-sided and impractical method of identification. Stainless steel pipes at room temperature can be divided into several categories according to their organizational structure: 1. Austenite type: such as 304, 321, 316, 310, etc.; 2. Martensite or ferrite type: such as 430, 420, 410, etc.; Austenite is non-magnetic or weakly magnetic, and martensite or ferrite is magnetic. The stainless steel usually used as decorative tube sheet is mostly austenitic 304 material. Generally speaking, it is non-magnetic or weak magnetic. However, due to chemical composition fluctuations or different processing conditions caused by smelting, magnetism may also appear, but this cannot be considered as Counterfeit or substandard. The reasons are as follows: As mentioned above, austenite is non-magnetic or weakly magnetic, while martensite or ferrite is magnetic. Due to component segregation or improper heat treatment during smelting, a small amount of martensite or ferrite structure will appear in the austenitic 304 stainless steel tube. In this way, the 304 stainless steel tube will have weak magnetism and will be attracted