What Is 316L (UNS S31603) Stainless Steel

316L (UNS S31603, 1.4404, SUS316L) is the low-carbon variant of 316, combining molybdenum corrosion resistance and post-weld intergranular corrosion resistance.

Equivalent Grades (Horizontal)

UNS: S31603 | JIS: SUS316L | GB: 022Cr17Ni12Mo2 | EN: X2CrNiMo17-12-2

Chemical Composition (wt%, Horizontal)

C: ≤0.03 | Si: ≤1.00 | Mn: ≤2.00 | P: ≤0.045 | S: ≤0.030 | Cr: 16.00-18.00 | Ni: 10.00-14.00 | Mo: 2.00-3.00 | Fe: Balance

Grade		C	Mn	Si	P	S	Cr	Mo	Ni	N
316	Min	-	-	-	0	-	16.0	2.00	10.0	-
	Max	0.08	2.0	0.75	0.045	0.03	18.0	3.00	14.0	0.10
316L	Min	-	-	-	-	-	16.0	2.00	10.0	-
	Max	0.03	2.0	0.75	0.045	0.03	18.0	3.00	14.0	0.10
316H	Min	0.04	0.04	0	-	-	16.0	2.00	10.0	-
	max	0.10	0.10	0.75	0.045	0.03	18.0	3.00	14.0	-

Key Properties (20°C, Annealed, Horizontal)

Density: 7.98g/cm³ | Melting Point: 1375-1450°C | Tensile Strength: 485-650N/mm² | 0.2% Yield Strength: ≥170N/mm² | Elongation: ≥40% | Hardness (HB): ≤217

Core Characteristics

Excellent chloride and post-weld corrosion resistance; no post-weld annealing needed; good ultra-low temperature toughness; suitable for welding-intensive harsh corrosion scenarios.

316 vs 316L (Horizontal)

Carbon Content: 316 (≤0.08%) | 316L (≤0.03%) | Tensile Strength: 316 (515-690N/mm²) | 316L (485-650N/mm²) | Post-weld Annealing: 316 (May need) | 316L (No need)

 

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