Which is best for tank fabrication, SS304 or SS304L?

When choosing stainless steel for industrial tank fabrication, SS304 and SS304L are among the most commonly considered grades. But which one is better? The answer depends on your application environment, welding requirements, and corrosion resistance expectations.

This article explores the difference between SS304 and SS304L, offers a data-driven comparison, and helps you decide which material is best suited for your tank project.

What Is the Difference Between SS304 and SS304L?

Property	SS304	SS304L
Carbon Content	≤ 0.08%	≤ 0.03% (Low Carbon)
Tensile Strength (MPa)	515 min	485 min
Yield Strength (MPa)	205 min	170 min
Typical Applications	Tanks, equipment, general fabrication	Tanks requiring heavy welding or stress-relieved zones

 

Why It Matters: When tanks are welded, SS304 can form Chromium Carbides, which may lead to Intergranular Corrosion in critical zones. SS304L's low carbon content reduces this risk, making it better suited for Heavily Welded Tanks and Corrosive Environments.

 

Corrosion resistance
SS304 (carbon ≤ 0.08%) and SS304L (carbon ≤ 0.03%) have similar corrosion resistance in general environments, and both are resistant to atmospheric and freshwater corrosion; however, due to its low carbon content, 304L is not easy to precipitate chromium carbides after welding or high-temperature use, and has better resistance to intergranular corrosion, making it particularly suitable for corrosion-resistant scenarios that require welding (such as chemical pipelines).
Weldability
SS304L has better weldability than SS304: 304L has a low carbon content that reduces the risk of sensitization in the heat-affected zone of welding, and corrosion resistance can be maintained without annealing after welding, making the welding process simpler; if SS304 is not properly cooled after welding, intergranular corrosion may occur, requiring strict control of parameters or additional heat treatment.

 

Which Is Better for Tank Fabrication?

Use SS304L when:

Your tank involves extensive welding.

The operating environment includes chlorides or aggressive chemicals.

You require higher corrosion resistance and longer lifecycle.

Use SS304 when:

The tank is not heavily welded or is used in mild environments.

You want a cost-effective solution with decent performance.

Structural strength is more important than corrosion resistance.

 

SS304 vs SS304L Price Per Kg

Grade	Approx. Price (USD/kg)*	Notes
SS304	$2.30 – $2.80	Widely available, good for standard tanks
SS304L	$2.50 – $3.10	Slightly more expensive, but better weldability

 

GNEE Offers Customized SS304/SS304L Tank Materials

At GNEE, we supply high-quality SS304 and SS304L plates, coils, and tank fittings in compliance with ASTM A240 / A276 standards. We offer:

Cut-to-size plates (up to 50mm thick)

MTC 3.1/BV/LR certification

Pickled or 2B finish for hygienic use

Welded/weldable tank components

Fast delivery for global clients

Contact now