S11212-422

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Technical Parameter Table: Carbon Steel Tube S11212-422

Product Name: Carbon Steel Tubes for Machine Structural Purposes
Designation: S11212-422 (JIS G 3445: STB 422)
Standard: JIS G 3445 (Japanese Industrial Standard)
Note: This grade is defined by its chemical composition, specifically its Manganese (Mn) content, which is higher than the standard carbon grades. This enhances hardenability and strength.

Parameter Category	Parameter	Value / Description	Notes & Interpretation
Designation Decoding	S11212	Indicates a carbon steel tube.	The “12” refers to a general carbon steel category.
	-422	The suffix “-422” specifically denotes the grade “STB 422” under JIS G 3445.	The “42” indicates a specific chemical composition with higher Manganese.
Mechanical Properties	Tensile Strength (Rm)	≥ 465 MPa	Higher than STB 021 and STB 121, due to the higher Mn content.
	Yield Strength (Rp0.2)	Not Specified (N/S)	Not the primary controlled property for this standard.
	Elongation (A), min	≥ 20%	Good ductility, balanced against its higher strength.
	Hardness	Not Specified (N/S)
Chemical Composition (Max %)	Carbon (C)	0.18 – 0.23%	Similar carbon content to STB 121.
	Manganese (Mn)	0.70 – 1.00%	Key feature: Higher Mn range than STB 121 (0.30-0.60%). This significantly increases strength and hardenability.
	Phosphorus (P)	≤ 0.040%	Impurity, controlled.
	Sulfur (S)	≤ 0.040%	Impurity, controlled.
	Silicon (Si)	Remarks: May be added as a killing agent.	Typically, Silicon is not specified but may be present.
Dimensional Standards	Manufacturing Process	Seamless or Welded & Cold-Drawn	The standard covers both.
	Tolerances	Strict dimensional and wall thickness tolerances.	Governed by JIS G 3445. Known for excellent dimensional accuracy.
Physical Properties	Surface Finish	Smooth, bright finish	Characteristic of cold-drawn tubes.
	Density	7.85 g/cm³	Standard for carbon steel.
Processing & Applications	Weldability	Fair (Requires Precautions)	The combination of medium Carbon and high Manganese increases hardenability, raising the risk of cracking in the Heat-Affected Zone (HAZ). Pre-heating and the use of low-hydrogen electrodes are recommended.
	Formability	Good	Can be bent and formed, but the higher strength requires more force than lower-grade tubes.
	Hardenability	Good	The elevated Manganese content makes this grade more responsive to heat treatment (e.g., quenching) to achieve higher strength and hardness if needed.
	Typical Applications	– High-strength mechanical structural parts – Automobile chassis and suspension components – Parts requiring good strength and toughness – Components that may be heat-treated after fabrication	Used in applications that require better mechanical properties than STB 121 but where the very high carbon content (and poor weldability) of STB 321 is not desirable.