Standard: ASTM A178, for Electric-Resistance-Welded Carbon Steel and Carbon-Manganese Steel Boiler and Superheater Tubes

 

Steel grade: Grade A,Grade C,Grade D

Size: 12.7-127mm,0.9-9.1mm, length,max 12000mm

 

Heat Treatment:

After welding, all tubes shall be heat treated at a temperature of 1650℉(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℉(650℃) or higher.

Surface Finish:
Finish Tubes are free of scale.
We have normal heat treatment annealing with black surface.
Have bright annealing with grey and bright surface.
 
Mechanical Testing:
Flattening Test
Flange Test

Crush Test

Tension Test

Reverse Flattening Test
Hydrostatic or Nondestructive Electric Test

 

Chemical Composition

Material	C %	Mn %	P %	S %
SA178 Gr.A	0.06-0.18	0.27-0.63	0.035max	0.035max
SA178 Gr.C	0.35max	0.8max	0.035max	0.035max
SA178 Gr.D	0.27max	1-1.5	0.03max	0.015max

 
Mechanical Property

Material	Tensile Strength	Yield Strength	Hardness,max
SA178 Gr.A	Ksi: 47 MPa: 325	Ksi: 26 MPa: 180	77 HRB (Rockwell B)
SA178 Gr.C	Ksi: 60 MPa: 415	Ksi: 37 MPa: 255	79 HRB (Rockwell B)
SA178 Gr.D	Ksi: 70 MPa: 485	Ksi: 40 MPa: 275	77 HRB (Rockwell B)