In-Depth Technical Manual for AISI 316 & 316L (V4A Steel Group) AISI 316 and 316L belong to the V4A steel group, which are austenitic stainless steels containing molybdenum (Mo). They offer excellent corrosion resistance in non-oxidizing acids and chloride-containing media, making them the premium solutions provided by CXE BEARING for marine environments, chemical equipment, and high-precision industrial bearings.
For sourcing context, compare this material discussion with CXE Bearing collection pages for AISI 316 stainless steel bearings, stainless steel bearings, and AISI 304 stainless bearings; those pages keep the article tied to bearing families buyers can actually quote.
1. Core Classifications and International Designations
In international trade and engineering technical specifications, the following standard cross-references are the core basis for selecting the correct bearing material:
US Standard (AISI) German Standard (W-Nr.) European Standard (EN Name) Brief Features
1.4401 X5CrNiMo17-12-2 Standard type, excellent comprehensive mechanical properties
316L 1.4404 X2CrNiMo17-12-2 Low carbon type, extremely strong resistance to intergranular corrosion
316L (High Performance) 1.4435 X2CrNiMo18-14-3 Higher Mo and Ni content, extremely low magnetism / completely non-magnetic
2. Full Element Chemical Composition Comparison Table (%)
Element (Symbol) 1.4401 (AISI 316) 1.4404 (AISI 316L) 1.4435 (High Performance 316L)
Carbon (C) <= 0.07 <= 0.03 <= 0.03
Chromium (Cr) 16.5 - 18.5 16.5 - 18.5 17.0 - 19.0
Molybdenum (Mo) 2.0 - 2.5 2.0 - 2.5 2.5 - 3.0
Nickel (Ni) 10.0 - 13.0 10.0 - 13.0 12.5 - 15.0
Nitrogen (N) <= 0.10 <= 0.10 <= 0.10
Manganese (Mn) <= 2.00 <= 2.00 <= 2.00
Silicon (Si) <= 1.00 <= 1.00 <= 1.00
3. Key Technologies and Selection Guide
A. What does the “L” in 316L stand for? “L” stands for Low Carbon. In CXE BEARING’s industrial manufacturing standards, the extremely low carbon content of 316L (<= 0.03%) allows it to effectively prevent chromium carbide precipitation after processing or welding, maintaining excellent intergranular corrosion resistance without the need for post-weld annealing.
B. Magnetism and Delta Ferrite Control
Standard Requirements: Standard 316/316L austenitic stainless steels typically exhibit no or weak magnetism.
Extreme Requirements: The special grade 1.4435 is defined as a completely non-magnetic steel. Its Delta ferrite content is strictly controlled below 0.5%, making it highly suitable for precision instrument environments sensitive to magnetic interference.
C. Temperature and Weather Resistance AISI 316 series materials not only maintain excellent toughness at extremely low temperatures, but their continuous use temperature can also reach up to 550°C. Their Pitting Resistance Equivalent Number (PREN) is much higher than that of 304 stainless steel, making them the ideal choice against marine salt spray.
4. Typical Application Segments in the Bearing Industry
Based on their superior material properties, the 316/316L stainless steel bearings provided by CXE BEARING are widely used in the following high-demand areas:
Marine and Offshore Engineering: Underwater robots, yacht accessories, and port lifting transmission components.
Medical and Pharmaceutical Equipment: Easy to sterilize under high temperature and pressure, and does not react with most chemicals (1.4435 non-magnetic grade is recommended).
Food and Beverage Processing: Resistant to corrosion from citric acid, acetic acid, and strong industrial cleaning agents.
Petrochemical Industry: Suitable for supporting bearings in pipeline equipment with high concentrations of chlorides and weak acids/bases.