Published 04 January 2026
The differences between 304 and 304L stainless steel and how to choose
Austenitic stainless steel is widely used in multiple fields such as industrial manufacturing, construction, food processing, medical devices, and chemical equipment, thanks to its excellent corrosion resistance, good formability, and weldability. Among them, 304 and 304L are the two most common grades. Although they are similar in appearance and overlapping in applications, there are critical differences in composition, performance, and applicable scenarios. A correct understanding of these differences is crucial for engineering material selection, cost control, and long-term safe operation. This article will conduct an in-depth analysis of the differences between 304 and 304L stainless steel from the aspects of chemical composition, mechanical properties, welding characteristics, corrosion resistance, and typical application scenarios, and provide practical selection suggestions. I. Basic Definitions and Differences in Chemical Composition 304 stainless steel (UNS S30400) is a standard 18-8 austenitic stainless steel, containing approximately 18% chromium (Cr) and 8% nickel (Ni), with excellent comprehensive performance. 304L (UNS S30403), on the other hand, is the “low-carbon” version of 304, where the “L” stands for Low Carbon. The core difference between the two lies in carbon content: – 304 stainless steel: Maximum carbon content is 0.08% – 304L stainless steel: Maximum carbon content is limited to 0.03%...
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