• No.101 Wanbo 1st Road, Nancun Town, Panyu District, Guangzhou, Guangdong, China
  • 0086-020-84886013，84886093，84886091，84886012
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Standard

ASTM A178/A178M

ASTM A178 / A178M Standard Specification for Electric-Resistance-Welded Carbon Steel and Carbon-Manganese Steel Boiler and Superheater Tubes. ASTM a178 standard refers to electric-resistance-welded tubes with minimum-wall-thickness. Materials are carbon steel and carbon-manganese steel, ASTM a178 pipe and tube is to be used in boiler tubes, boiler flues, superheater flues and safe ends.


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

-120



S≧20mm

±12.5%


Chemical Requirements

Element

Grade A

Grade C

Grade D

%

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

0.03

S

0.035

0.035

0.015

Si

...

...

0.10 Min.


Tensile Requirements

Grade C and D tubes shall conform to the requirements as to tensile properties

Data

GradeC

GradeD

Tensilestrength,min,ksi[MPa]

60[415]

70[485]

Yieldstrength,min,ksi[MPa]

37[255]

40[275]

Elongationin2in.or50mm,min,%

30

30

For longitudinal strip tests a deduction for Each1⁄32-in[0.8mm]decreaseinwallthicknessbelow5⁄16in.[8mm]

1.50A

1.50A


The actual mean wall is defined as the average of the thickest and thinnest wall in that section.

Welded tubes 65 %

Type

Over

Under

Welded Tubes

0.18

0


Mechanical Property:

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

Type

Over

Under

Welded Tubes

0.18

0


Application Industries

A178 Boiler Pipes & Tubes are used in boiler, superheater, heat-exchanger and pressure equipment in Petrochemical factory, Refinery factory, sugar mill, power plant, power plant, shipbuilding.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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  • No.101 Wanbo 1st Road, Nancun Town, Panyu District, Guangzhou, Guangdong, China
  • 0086-020-84886013，84886093，84886091，84886012
  • sales@finegosteel.com
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