Boiler tubing

A178 Boiler Tubing

Offering a wide range of welded and drawn Grade A A178 Boiler Tube. Especially relevant is that our ASME SA178A, ASTM A178B Boiler Tube with characteristics which include low carbon steel, C=0, 18 Max, Eddy Current Tested A178M Superheater Tubes, with Minimum Wall Thickness.

First of all, our A178 boiler tube is super heat resistant. Therefore, it’s used in many applications where boiler tubes, boiler flues, superheater, and safe ends are being employed. In addition, we stock several grades of boiler tube which include Grade A (low-carbon), C (medium-carbon steel), and/or D (carbon-manganese steel).

All our tubing has been heat-treated after welding then cooled. And the steel used in its manufacture conforms to the stated composition of carbon, manganese, phosphorus, sulfur, and silicon. Furthermore, grades C and D conforms to stated tensile requirements; including tensile strength, yield strength, and elongation. As a result of A178 requirements, the finished tubing is subjected to Nondestructive and Hydrostatic testing such as flattening, tension, flange, and reverse flattening.

ASTM A178 electric resistance welded tubing is used in many industries and applications:

Boilers
Heat Exchangers
Power Plants, i.e Gas, Oil, Coal, Thermal, and Nuclear
Condensers
Marine Shipping
Refineries
Paper Pulp
Petrochemical
Pressure Vessels
General Engineering

ASTM A178 Welded Tubes Chemical Composition

Element

Grade A
Low-Carbon

Grade C
Medium-Carbon Steel

Grade D
Carbon-Manganese Steel

Carbon

0.06-0.18

0.35 max

0.27 max

Manganese

0.27-0.63

0.80 max

1.00-1.50

Phosphorus, max

0.035

0.030

Sulphur, max

0.04

0.035

0.015

Silicon

…

0.10 min

ASTM A178 Welded Tubes Yield and Tensile Strength

Grade

Tensile Point (Mpa)

Yield Point (Mpa)

Elongation (%) in 2 in. or 50mm

Grade C

255

415

Grade D

275

485

ASTM A178 Welded Boiler Tube

ASTM A178 Welded Boiler Tube

Standards: ASTM A178 (ASME SA178)

ASTM A178/A 178M Standard Specification for Electric-Resistance-Welded Carbon Steel and Carbon-Manganese Steel Boiler and Superheater Tubes

Grade: Grade A Grade C Grade D

Size: OD 1/2in-5in(12.7-127mm)

Wall thickness:0.035in-0.360in(0.9-9.1mm)

Different name

Condenser steel tube,heat-exchanger tube,low carbon steel pipe,Resistance welded steel tube ,Bolier flues,Spoerheater flues and safe ends,ERW carbon steel pipes.

Chemical Composition:

Element %	Grade A	Grade C	Grade D
Element %	Low carbon steel	Medium Carbon Steel	Manganess Steel
C	0.06-0.18	0.35 Max	0.27 Max
Mn	0.27-0.63	0.80 Max	1.00-1.50
P	0.035	0.035	0.030
S	0.035	0.035	0.015
Si	...	...	0.10 Min.

Mechanical Property:

Grade C & Grade D tubes shall conform to the requirements -tensile properties prescribed below:

TensileRequirements
Data	GradeC	GradeD
Tensilestrength,min,ksi[MPa] Yieldstrength,min,ksi[MPa] Elongationin2in.or50mm,min,% For longitudinal strip tests a deduction for Each1⁄32-in[0.8mm]decreaseinwallthicknessbelow5⁄16in.[8mm]	60[415] 37[255] 30 1.50A	70[485] 40[275] 30 1.50A

From the basic minimum elongation of the following percentage points shall be made

Grade A
Tensilestrength,min,ksi[MPa] Yieldstrength,min,ksi[MPa] Elongationin2in.or50mm,min,%	47[325] 26[180] 35

Outside diameter and Wall ThicknessTolerance:

Outside Diameter tol		Wall thickness tol
OD < 50	±0.05mm	S < 4mm	±12.5%
OD > 50	±1%	4--20mm	+15/-12.5%
		S≧20mm	±12.5%

Referenced Documents:

ASTM standards:

A450/A450M Specification for General Requirements for Carbon,Ferritic Alloy,and Austenitic Alloy steel tubes.

E213 Practice for Ultrasonic Examination of Metal pipe and tubing.

E273 Practice for Ultrasonic Examination of Longitudinal Welded Pipe and Tubing.

Manufacturing Process: ERW

Heat treatment:
After welding,all tubes shall be heat treated at a temperature of 1650°F(900℃) or higher and followed by cooling in air or in the cooling chamber of a controlled-atmosphere furnace,Cold-drawn tubes shall be heat treated after the final cold-draw pass at a temperature of 1200°F(650℃)or higher.

Surface Condition:

Finished tubes shall be free of scale,A slight amount of oxidation will not be considered as scale.

Mechanical Tests Required:

Flattenting Test/Flaring test/Flange test/Crush test/Tension test/Reverse Flattening test/Hydrostatic or Nondestructive Electric Test

Usage

Used in boiler, superheater, heat-exchanger and pressure equipment in Petrochemical factory, Refinery factory, sugar mill, power plant, power plant, shipbuilding.

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