Solve Corrosion Problems in Demanding Environments

303 seamless stainless steel pipes provide exceptional resistance to corrosion and oxidation in harsh industrial settings. These pipes eliminate rust issues that plague ordinary steel pipes in chemical processing, food production, and marine applications. With superior durability and minimal maintenance requirements, our 302 seamless pipes ensure long-term reliability while reducing replacement costs and downtime. The non-magnetic properties make them ideal for sensitive electronic and medical equipment where magnetic interference must be avoided.

Advanced Manufacturing and Technical Superiority

Our 302 seamless stainless steel pipes feature precise chemical composition with chromium content of 24-26% and nickel content of 6-8%, providing enhanced corrosion resistance compared to standard 304 stainless steel. The seamless construction ensures uniform wall thickness and superior pressure containment capabilities. Available in thicknesses from 0.6mm to 6.0mm and diameters from 4mm to 200mm, these pipes maintain excellent mechanical properties with tensile strength ≥795 MPa and yield strength ≥550 MPa. The hot rolling and cold rolling production technologies guarantee dimensional accuracy and surface quality.

Easy Installation and Customization Options

302 seamless stainless steel pipes offer excellent fabrication characteristics with easy cutting, welding, and forming capabilities. Standard lengths of 1-6 meters are available with custom cutting services to meet specific project requirements. Multiple surface finishes including bright polishing, NO.4, BA, and matt surfaces provide flexibility for different aesthetic and functional needs. Edge grinding and trimming services ensure perfect fitment during installation. The pipes' excellent elongation properties (≥15%) allow for bending and shaping without compromising structural integrity.

Quality Assurance and Global Compliance

Every 302 seamless stainless steel pipe undergoes rigorous quality control and testing to ensure compliance with international standards including ASTM, AISI, JIS, GB, DIN, and EN. Our manufacturing facilities maintain ISO, SGS, and BV certifications, guaranteeing consistent quality across all production batches. With comprehensive material traceability and test certificates provided with each shipment, you can trust the reliability and performance of our products. Our experienced technical support team assists with material selection and application engineering for optimal project outcomes.

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FAQS

What is stainless steel
什么是不锈钢

Stainless steel is an alloy of Iron with a minimum of 10.5% Chromium. Chromium produces a thin layer of oxide on the surface of the steel known as the ‘passive layer‘. This prevents any further corrosion of the surface. Increasing the amount of Chromium gives an increased resistance to corrosion.
不锈钢是铬含量至少为 10.5% 的铁合金。铬在钢表面产生一层薄薄的氧化物，称为“ 钝化层 ”。这可以防止表面进一步腐蚀。增加铬的含量可以提高耐腐蚀性。

Stainless steel also contains varying amounts of Carbon, Silicon and Manganese. Other elements such as Nickel and Molybdenum may be added to impart other useful properties such as enhanced formability and increased corrosion resistance.
不锈钢还含有不同数量的碳、硅和锰。可以添加其他元素，如镍和钼，以赋予其他有用的特性，例如增强的成型性和  更高的耐腐蚀性。

When was stainless steel discovered ?
不锈钢是什么时候发现的？

There is a widely held view that stainless steel was discovered in 1913 by Sheffield metallurgist Harry Brearley. He was experimenting with different types of steel for weapons and noticed that a 13% Chromium steel had not corroded after several months. However, the picture is much more complex than this. For a comprehensive view read The Discovery of Stainless Steel.
人们普遍认为不锈钢是由谢菲尔德冶金学家哈里·布雷尔利 （Harry Brearley） 于 1913 年发现的。他正在试验不同类型的武器钢，并注意到 13% 铬钢在几个月后没有腐蚀。然而，情况远比这复杂得多。如需全面了解，请阅读 《不锈钢的发现 》。

1. Ferritic – These steels are based on Chromium with small amounts of Carbon, usually less than 0.10%. These steels have a similar microstructure to carbon and low alloy steels. They are usually limited in use to relatively thin sections due to lack of toughness in welds. However, where welding is not required they offer a wide range of applications. They cannot be hardened by heat treatment. High Chromium steels with additions of Molybdenum can be used in quite aggressive conditions such as sea water. Ferritic steels are also chosen for their resistance to stress corrosion cracking. They are not as formable as austenitic stainless steels. They are magnetic.
铁素体 – 这些钢以铬为基础，碳含量很少，通常低于 0.10%。这些钢具有与碳钢和低合金钢相似的微观结构。由于焊缝缺乏韧性，它们通常仅限于相对较薄的部分使用。然而，在不需要焊接的地方，它们提供了广泛的应用。它们不能通过热处理硬化。添加钼的高铬钢可用于海水等非常恶劣的条件下。选择铁素体钢也是因为它们抗应力腐蚀开裂。它们不像奥氏体不锈钢那样可成型。它们是磁性的。

2. Austenitic – These steels are the most common. Their microstructure is derived from the addition of Nickel, Manganese and Nitrogen. It is the same structure as occurs in ordinary steels at much higher temperatures. This structure gives these steels their characteristic combination of weldability and formability. Corrosion resistance can be enhanced by adding Chromium, Molybdenum and Nitrogen. They cannot be hardened by heat treatment, but have the useful property of being able to be work hardened to high strength levels whilst retaining a useful level of ductility and toughness. Standard austenitic steels are vulnerable to stress corrosion cracking. Higher nickel austenitic steels have increased resistance to stress corrosion cracking. They are nominally non-magnetic, but usually exhibit some magnetic response depending on the composition and the work hardening of the steel.
奥氏体 – 这些钢是最常见的。它们的微观结构源自镍、锰和氮的添加。它与在更高温度下的普通钢中出现的结构相同。这种结构赋予这些钢具有可焊性和成型性的特征组合。通过添加铬、钼和氮气可以增强耐腐蚀性。它们不能通过热处理硬化，但具有能够加工硬化到高强度水平的有用特性，同时保持有用的延展性和韧性水平。标准奥氏体钢容易受到应力腐蚀开裂的影响。高镍奥氏体钢具有更高的抗应力腐蚀开裂能力。它们名义上是非磁性的，但通常表现出一些磁响应，具体取决于钢的成分和加工硬化。

3. Martensitic – These steels are similar to ferritic steels in being based on Chromium, but have higher Carbon levels, up as high as 1%. This allows them to be hardened and tempered much like carbon and low-alloy steels. They are used where high strength and moderate corrosion resistance is required. They are a little more common in long products than in sheet and plate form. They have generally low weldability and formability. They are magnetic.
马氏体 – 这些钢与铁素体钢相似，以铬为基础，但碳含量更高，高达 1%。这使得它们能够像碳钢和低合金钢一样进行硬化和回火。它们用于需要高强度和中等耐腐蚀性的地方。它们在长产品中比在片材和板材中更常见。它们通常具有较低的可焊性和成型性。它们是磁性的。

4. Duplex – These steels have a microstructure which is approximately 50% ferritic and 50% austenitic. This gives them a higher strength than either ferritic or austenitic steels. They are resistant to stress corrosion cracking. So called “lean duplex” steels are formulated to have comparable corrosion resistance to standard austenitic steels, but with enhanced strength and resistance to stress corrosion cracking. “Superduplex” steels have enhanced strength and resistance to all forms of corrosion compared to standard austenitic steels. They are weldable, but need care in selection of welding consumables and heat input. They have moderate formability. They are magnetic, but not so much as the ferritic, martensitic and PH grades, due to the 50% austenitic phase.
双相 – 这些钢的微观结构约为 50% 的铁素体和 50% 的奥氏体。这使它们具有比铁素体或奥氏体钢更高的强度。它们具有抗应力腐蚀开裂的能力。所谓的“精益双相”钢的配方具有与标准奥氏体钢相当的耐腐蚀性，但具有增强的强度和抗应力腐蚀开裂性。与标准奥氏体钢相比，“超级双相”钢具有增强的强度和对各种形式的腐蚀的抵抗力。它们是可焊接的，但在选择焊材和热输入时需要小心。它们具有适度的成型性。它们具有磁性，但由于奥氏体相为 50%，因此不如铁素体、马氏体和 PH 等级。

5. Precipitation hardening (PH) – These steels can develop very high strength by adding elements such as Copper, Niobium and Aluminium to the steel. With a suitable “aging” heat treatment, very fine particles form in the matrix of the steel which imparts strength. These steels can be machined to quite intricate shapes requiring good tolerances before the final aging treatment as there is minimal distortion from the final treatment. This is in contrast to conventional hardening and tempering in martensitic steels where distortion is more of a problem. Corrosion resistance is comparable to standard austenitic steels like 1.4301 (304).
沉淀硬化 （PH） – 这些钢可以通过在钢中添加铜、铌和铝等元素来产生非常高的强度。通过适当的“时效”热处理，钢基体中会形成非常细的颗粒，从而赋予强度。这些钢可以加工成非常复杂的形状，在最终时效处理之前需要良好的公差，因为最终处理的变形最小。这与马氏体钢的传统硬化和回火形成鲜明对比，在马氏体钢中，变形是一个更大的问题。耐腐蚀性可与 1.4301 （304） 等标准奥氏体钢相媲美