S11299-121

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Technical Parameter Table: Stainless Steel Tube S11299-121

Product Name: Stainless Steel Pipes and Tubes for General Service
Designation: S11299-121 (JIS G 3447: SUS 304L)
Standard: JIS G 3447 (Japanese Industrial Standard)
Equivalent Grades: ASTM A269 TP304L, EN 1.4307, AISI 304L
Note: This is the low-carbon version of the classic SUS 304 grade, offering superior corrosion resistance after welding.

Parameter Category	Parameter	Value / Description	Notes & Interpretation
Designation Decoding	S11299	JIS G 3447 Standard for Stainless Steel Tubes.
	-121	The suffix “-121” specifically denotes the grade “SUS 304L” under JIS G 3447.	The “L” stands for “Low Carbon”.
Mechanical Properties	Tensile Strength (Rm)	≥ 480 MPa	Slightly lower than standard SUS 304 due to lower carbon content.
	Yield Strength (Rp0.2), min	≥ 175 MPa	Slightly lower than standard SUS 304.
	Elongation (A), min	≥ 40%	Excellent ductility and formability.
	Hardness (HB), max	≤ 187 HB
Chemical Composition (Max %)	Carbon (C)	≤ 0.030%	This is the defining characteristic. Ultra-low carbon prevents harmful carbide precipitation during welding.
	Chromium (Cr)	18.00 – 20.00%	Provides excellent corrosion resistance.
	Nickel (Ni)	9.00 – 13.00%	Note the slightly higher Ni range compared to SUS 304 to maintain austenite stability.
	Manganese (Mn)	≤ 2.00%
	Silicon (Si)	≤ 1.00%
	Phosphorus (P)	≤ 0.045%
	Sulfur (S)	≤ 0.030%
Physical Properties	Density	8.0 g/cm³
	Modulus of Elasticity	~193 GPa
	Melting Range	1400 – 1450 °C
Corrosion Resistance	General Performance	Excellent, equivalent to SUS 304 in most environments.
	Intergranular Corrosion	Superior Resistance.	The very low carbon content makes it immune to sensitization (chromium carbide formation at grain boundaries) during welding. This is its primary advantage.
Processing & Applications	Weldability	Excellent	The preferred grade for welding as it does not require post-weld annealing for most applications to restore corrosion resistance.
	Formability	Excellent
	Heat Treatment	Solution Treatment (Annealing)	Heated to 1010-1120°C and rapidly quenched.
	Typical Applications	– Welded fabrications for chemical processing equipment – Heat exchangers – Pharmaceutical and food processing equipment (where welds are common) – Architectural applications with welded joints – Any application where the component cannot be annealed after welding	Used in all applications where SUS 304 is suitable but welding is involved and maximum corrosion resistance in the weld zone is critical.