ASTM A178 ASME SA178 Welded Steel Boiler Tubes for Boiler and Superheater

ASTM A178 Welded Steel Boiler and Superheater Tubes

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ASTM A178/A178M, ASME SA178/SA178M is the standard applicable to electric-resistance-welded carbon steel and carbon manganese steel boiler and superheater tubes.

ASTM A178 Standard covers minimum-wall-thickness, electric-resistance-welded tubes made of carbon steel and carbon-manganese steel intended for use as boiler tubes, boiler flues, superheater flues, and safe ends.

SA178 tubing sizes and thicknesses usually furnished to this specification are 1⁄2 to 5 in. [12.7 to 127 mm] in outside diameter and 0.035 to 0.360 in. [0.9 to 9.1 mm], inclusive, in minimum wall thickness. Tubing having other dimensions may be furnished, provided such tubes comply with all other requirements of this specification.

Applications:

ASTM A178 tubes are a kind of frequently-used tubes in our life, they are mainly used in manufacturing heating pipelines, containers, coal-saving devices, superheaters, arch superheated tube, airway tube etc.

Quick Detail:

Standard: ASTM A178, ASME SA178

Grade: Grade A, Grade C, Grade D

Technique: Electric-Resistance-Welded

Delivery Condition: Annealed, Normalized, Tempered, Heat Treatment, BK, BKS,

BKW, NBK, GBK

Section Shape: Round

Surface Treatment: Varnish

Size: (mm)

OD: 12.7mm to 127mm

Wall thickness: 1.5mm to 6.0mm

Length: 6m-25m

Ends: Plain ends or bevel ends

Test and other terms:

Hydrostatic or Nondestructive Electric Test
Heat Treatment: according to Standard
Surface Condition: According to Standard.
Grain Size: According to standard
Sampling: flattening, flaring, grain size, Marking

Chemical Compositions (%)

Element	Grade A,	Grade C,	Grade D
Element	Low-Carbon Steel	Medium-Carbon Steel	Carbon-Manganese Steel
Carbon	0.06-0.18	0.35max	0.27max
Manganese	0.27-0.63	0.08max	1.00-1.50
Phosphorus, max	0.035	0.035	0.03
Sulfur, max	0.035	0.035	0.015
Silicon	…	…	0.01 min

A178 Mechanical Properties

	Grade A	Grade C	Grade D
Tensile strength, min, ksi [MPa]	47[325]	60[415]	70[485]
Yield strength, min, ksi [MPa]	26[180]	37[255]	40[275]
Elongation in 2 in. or 50mm, min, %	35	30	30
For longitudinal strip tests a deduction for	1.50A	1.50A	1.50A
Each1⁄32-in[0.8mm] decrease in wall thickness below 5⁄16in. [8mm]
From the basic minimum elongation of the following percentage points shall be made

Outside Diameter and Wall thickness Tolerance:

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

Note:

Mill test certificates will be issued according to EN10204.3
The tubes Shall be Seamless, and the testing shall be as per A 450 / A450M.
Application: apply to the heat exchangers, condensers and heat transfer equipment and similar pipe.

Packing:

Packed in wooden box or bundles protected with plastic paper, and suitably protected for sea-worthily delivery or as requested.
The Product marking shall include the ASTM A178 or ASME SA178, size, heat no., Lot No. and Manufacture name or logo.