Grade 304L Austenitic Stainless Steel – Weld-Friendly Low-Carbon Corrosion Solution

Description

Grade 304L is the low-carbon iteration of Grade 304, engineered specifically to eliminate intergranular corrosion (sensitization) in welded components. With a maximum carbon content of 0.03%, it prevents the formation of chromium carbides in the heat-affected zone during welding, eliminating the need for post-weld annealing-a critical advantage for large or complex welded structures. It retains the same chromium-nickel composition as 304, delivering identical general corrosion resistance and formability, while offering enhanced ductility and weld integrity. Unlike standard 304, 304L is the preferred choice for heavy-section fabrications, chemical processing equipment, and piping systems where post-weld corrosion resistance is non-negotiable, providing a reliable, cost-effective solution for welded applications.

Chemical Composition (wt%)

C ≤ 0.03, Cr: 18.00-20.00, Ni: 8.00-11.00, Mn ≤ 2.00, Si ≤ 1.00, P ≤ 0.045, S ≤ 0.030

Mechanical Properties

Tensile Strength ≥ 480 MPa, Yield Strength ≥ 175 MPa, Elongation ≥ 40%, Hardness ≤ 200 HB

Advantages

Sensitization-resistant (no post-weld annealing required); superior intergranular corrosion resistance vs. 304; excellent weldability and ductility; non-magnetic; retains 304's general corrosion performance; ideal for welded structures.

Applications

Welded pressure vessels, chemical piping, pharmaceutical equipment, food processing pipelines, large-scale welded fabrications, and components requiring post-weld corrosion stability.

Equivalent Grades

AISI 304L, UNS S30403, EN 1.4307, GB 022Cr19Ni10, SUS304L

 

Stainless Steel Suppliers

If you have project requirements for stainless steel, we welcome your order. GNEE has a large inventory of popular products for you to choose from. It can be processed into various practical product forms, including plates, coils, tubes, bars, wires, etc. For detailed chemical composition information and free samples, please contact our factory immediately. We offer competitive prices and excellent service.Email: info@gneestainless.com

 

Testing and Documentation: Factory test certificate, EN 10204 3.1, chemical report, mechanical report, destructive testing report, non-destructive testing report, PMI test report, visual inspection report, third-party inspection report, NABL certified laboratory report.
Packaging: Wooden crate packaging, bubble wrap packaging, steel strapping, or packaging according to customer requirements.