The main differences between duplex steel 2205 and 2507 are composition, mechanical properties, corrosion resistance, application areas, organizational structure, price and market supply.

Composition: The main components of 2205 duplex steel are chromium, nickel, molybdenum and nitrogen, of which the chromium content is about 22%, the nickel content is about 5%, the molybdenum content is about 3%, and the nitrogen content is about 0.18%. The main components of 2507 duplex steel are chromium, nickel, molybdenum and copper, of which the chromium content is about 25%, the nickel content is about 7%, the molybdenum content is about 4%, and the copper content is about 0.5%.

Mechanical properties: The tensile strength of 2205 duplex steel is about 620MPa, the yield strength is about 450MPa, and the elongation is about 25%. In contrast, the tensile strength of 2507 duplex steel is about 800MPa, the yield strength is about 550MPa, and the elongation is also about 25%. This shows that 2507 duplex steel performs better in mechanical properties.

Corrosion resistance: 2205 duplex steel has excellent corrosion resistance and can be used in a variety of corrosive media, including acids, alkalis, salts, etc. Its resistance to chloride stress corrosion is better than that of general austenitic stainless steel. 2507 duplex steel has higher corrosion resistance, especially in chlorine-containing media, and its resistance to chloride stress corrosion is about twice that of 2205 duplex steel. Therefore, 2507 duplex steel can better meet the harsh conditions of use.

Application areas: 2205 duplex steel is widely used in marine engineering, chemical industry, oil and gas industry, food processing industry and construction field. 2507 duplex steel also has a wide range of applications, such as oil and gas industry, marine engineering, chemical industry, food processing and medical equipment. Because 2507 has higher corrosion resistance, it has greater application potential in harsher environments.

Organization structure: Both are duplex stainless steels, that is, they contain both austenite and ferrite structures, which makes them both have excellent strength and corrosion resistance. However, the specific organization structure may vary slightly due to differences in composition and heat treatment process.

Price and market supply: Since the composition of 2507 duplex steel is more complex and its performance is better, its price is usually relatively high. However, the actual price is also affected by many factors such as market supply and demand, production costs, and regional differences. In terms of market supply, both duplex steels have certain production and supply capabilities, but the specific supply situation may vary from region to region and manufacturer to manufacturer.

In summary, 2507 duplex steel performs better in composition, mechanical properties, corrosion resistance, etc., so it has greater application potential in more severe environments. Although its price is relatively high, its excellent performance can reduce its usage, thereby saving costs. ‌