Comparison of corrosion resistance between 316L and duplex stainless steel 2205 in actual testing

Comparison in terms of corrosion resistance
2205: It performs better in chloride environments (such as seawater, strong acids and bases), especially in stress corrosion cracking and localized corrosion (such as pitting and crevice corrosion), and can replace some high alloy materials. ‌‌
316L: It has good resistance to uniform corrosion, but is prone to stress corrosion cracking in high temperature or high concentration chloride environments. ‌‌

What is the application scenario?
2205: Widely used in high-strength and corrosion-resistant scenarios such as oil and gas pipelines, marine engineering, chemical equipment, etc. ‌‌
316L: commonly used in food processing equipment, medical devices, and general chemical environments

 

How is the mechanical performance?
2205: The yield strength is more than twice that of 316L (such as tensile strength ≥ 550MPa), suitable for manufacturing thinner wall thickness structures, which can reduce material consumption and lower costs. ‌‌
316L: Low yield strength (about 205MPa), suitable for structural components with conventional strength requirements

 

Cost and processability
2205: Due to the higher content of alloying elements and the need for strict process control during processing (such as avoiding medium temperature brittleness), the cost is usually higher than 316L
316L: It has good processing performance and lower price, but requires higher wall thickness design in specific environments to balance strength and cost. ‌‌

 

What is duplex stainless steel 2205?
Duplex stainless steel 2205 alloy is composed of 22% chromium, 2.5% molybdenum, and 4.5% nickel nitrogen alloy. It has high strength, good impact toughness, and excellent overall and local stress corrosion resistance.