ERW Boiler & Air Heater Tubes

Chemical Composition & Mechanical Properties of ERW Boiler & Air Heater Tubes

Specification	Alloy	Grade	Si (Max)	Fe (Max)	Cu (Max)	Mn (Max)	Mg (Max)	Zn (Max)	Ti (Max)	Others (Max)	Yield Strength (Min) MPa	Tensile Strength (Min) MPa	% Elongation	Hardness (Max)
ASTM A213	T91	Seamless	0.10	0.30	0.25	0.30	0.50	0.10	0.02	0.05	290	550	18	85 HRB
ASTM A213	T22	Seamless	0.10	0.30	0.25	0.30	0.50	0.10	0.02	0.05	205	415	20	90 HRB
ASTM A210	T1	Seamless	0.10	0.30	0.25	0.30	0.50	0.10	0.02	0.05	235	410	21	80 HRB
ASTM A192	-	Seamless	0.20	0.50	0.30	0.60	0.50	0.10	0.02	0.05	310	525	16	95 HRB
ASTM A179	-	Seamless	0.25	0.50	0.30	0.60	0.50	0.10	0.02	0.05	240	480	18	90 HRB

Category	Details
Standard Pipe Dimensions	Outer Diameter (OD): 1/8" (0.375") to 48" (12.5 cm)
	Wall Thickness (WT): Varies from Schedule 10 to Schedule 160
	Schedules: 5, 10, 20, 40, 80, 160, XXS (Extra Extra Strong), etc.
Pipe Manufacturing Process	Seamless Pipe: Formed from a solid billet, no welding required
	Welded Pipe: Made from welded stainless steel coils
	ERW (Electric Resistance Welded): Uses electric resistance for welding
	Spiral Welded Pipe: Weld spirally wound around the pipe (for large sizes)
Surface Finishes	Mill Finish: Basic finish from manufacturing
	Pickled and Passivated: Removes scale and oxide for better corrosion resistance
	Polished: Mirror or satin finish for aesthetic and sanitary applications
	Brushed: Textured, non-reflective surface for architectural use
Applications	Industries Served: Food & Beverage, Chemical & Petrochemical, Marine & Offshore, Oil & Gas

Spec	Outside Dia. (Avg)	Pipe Body	Pipe End	Wall Thickness	Weight	Length (Nominal)	Dimensions/Weight Tolerance
ASTM A213	±0.2%	N.A.	+10%, -5%	±10%	+10%	Upto 6m: ±3mm	±3mm, -6mm, +6mm
ASTM A210	±0.3%	N.A.	+10%, -5%	±10%	+10%	Upto 6m: ±3mm	±3mm, -6mm, +6mm
ASTM A192	±0.25%	N.A.	+10%, -5%	±10%	+10%	Upto 6m: ±3mm	±3mm, -6mm, +6mm
ASTM A179	±0.15%	N.A.	+10%, -5%	±10%	+10%	Upto 6m: ±3mm	±3mm, -6mm, +6mm