What Is 304L Stainless Steel

304L (UNS S30403, 1.4306, SUS304L) is the low-carbon variant of 304, focusing on post-weld intergranular corrosion resistance, with similar formability and cost-effectiveness.

Grade		C	Mn	Si	P	S	Cr	Mo	Ni	N
304	min.	-	-	-	-	-	18.0	-	8.0	-
	max.	0.08	2.0	0.75	0.045	0.030	20.0		10.5	0.10
304L	min.	-	-	-	-	-	18.0	-	8.0	-
	max.	0.030	2.0	0.75	0.045	0.030	20.0		12.0	0.10
304H	min.	0.04	-	-	-0.045	-	18.0	-	8.0	-
	max.	0.10	2.0	0.75		0.030	20.0		10.5

Equivalent Grades (Horizontal)

UNS: S30403 | JIS: SUS304L | GB: 022Cr19Ni10 | EN: X2CrNi18-10

Chemical Composition (wt%, Horizontal)

C: ≤0.03 | Si: ≤1.00 | Mn: ≤2.00 | P: ≤0.045 | S: ≤0.030 | Cr: 18.00-20.00 | Ni: 8.00-12.00 | N: ≤0.10 | Fe: Balance

Key Properties (20°C, Annealed, Horizontal)

Density: 7.93g/cm³ | Melting Point: 1400-1450°C | Tensile Strength: 485-650N/mm² | 0.2% Yield Strength: ≥170N/mm² | Elongation: ≥40% | Hardness (HB): ≤201

Core Characteristics

Excellent post-weld intergranular corrosion resistance (no annealing needed); good ductility and weldability; slightly lower strength than 304; cost-effective for welding-intensive scenarios.

304 vs 304L (Horizontal)

Carbon Content: 304 (≤0.08%) | 304L (≤0.03%) | Tensile Strength: 304 (515-690N/mm²) | 304L (485-650N/mm²) | Post-weld Annealing: 304 (May need) | 304L (No need)

 

 

304 Stainless Steel Suppliers

If you have project requirements for 304 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.