The introduction of steel materials used in stainless steel hollow ball：

1.201 Stainless Steel: 

201 stainless steel is a high-manganese stainless steel that contains approximately 16-18% chromium and 3.5-5.5% nickel. It has some corrosion resistance and mechanical properties, but its corrosion resistance is relatively weaker compared to 304 and 316 stainless steel. 201 stainless steel is often used in decoration and construction applications, such as furniture, railings, and decorative items.

2.304 Stainless Steel:

 304 stainless steel is a commonly used and widely applied stainless steel material, also known as 18-8 stainless steel. It contains approximately 18-20% chromium and 8-10.5% nickel, with small amounts of carbon and other alloying elements. 304 stainless steel has good corrosion resistance, high-temperature resistance, and weldability, making it suitable for various environments and applications such as food processing, chemical equipment, and medical devices.

3.316 Stainless Steel: 

316 stainless steel is a premium stainless steel material, also known as marine-grade stainless steel. It contains approximately 16-18% chromium, 10-14% nickel, 2-3% molybdenum, and other alloying elements. 316 stainless steel exhibits excellent corrosion resistance, particularly against chloride and saltwater environments. Therefore, it is commonly used in marine equipment, chemical industries, seawater treatment, and other corrosion-resistant applications.

4.420 Stainless Steel: 

420 stainless steel is a martensitic stainless steel that contains around 12-14% chromium. It is known for its high hardness, good corrosion resistance, and excellent wear resistance. 420 stainless steel is often used in the manufacturing of surgical instruments, dental tools, cutting tools, and mechanical parts where high strength and corrosion resistance are required.

5.440C Stainless Steel:

440 stainless steel is a family of martensitic stainless steels, including 440A, 440B, and 440C. These grades contain varying levels of carbon, chromium, and other alloying elements. 440 stainless steels are known for their high hardness, good corrosion resistance, and excellent edge retention. They are commonly used in the production of knives, blades, bearings, and other applications that require high wear resistance and sharpness.