The ASTM A192 High-pressure Steel Boiler Tube shall be made by the seamless process and shall be either hot-finished or cold-finished. Hot-finished tubes need not be heat treated. Cold-finished tube shall be heat treated after the final cold-finishing at a temperature of 1200°F [650°C] or higher.
Size:OD: 12.7-177.8mm, WT: 2.2-25.4mm, L:6-3.2m
Heat Treatment:
Hot-finished tubes need not be heat treated. Cold finished tubes shall be heat treated after the final cold-finishing at a temperature of 1200°F [650°C] or higher.
Chemical Composition:
|
Grade |
Mfg. Process |
Chemical composition(%) |
||||
|
C |
Si |
Mn |
P |
S |
||
|
ASTM A192 |
S |
0.06~0.18 |
0.25Max |
0.27~0.63 |
0.035Max |
0.035Max |
ASTM A192 Mechanical Properties:
|
Grade |
Elongation % |
Tensile Test MPa or N/mm2 |
Hardness |
|
|
A |
Min Yield point |
Tensile Strength |
Rockwell |
|
|
ASTM A192 |
=35 |
=180 |
=325 |
77 HRB |
Hardness Requirements:
Brinell Hardness Number (Tubes 0.200 in. [5.1 mm] and over in 0.200 in.wall thickness) 137HB Rockwell Hardness (Tubes less than [5.1 mm] in wall thickness)：77 HRB
Mechanical Tests Required: Flattening Test, Flaring Test, Hardness Test, Hydrostatic Test
ASTM A192 is a standard for seamless carbon steel boiler and superheater tubes with minimum wall thickness for high-pressure applications. The dimensions and thicknesses of the pipes normally supplied in accordance with this specification are 1/2 "to 7" outside diameter (12.7 to 177.8 mm) and minimum wall thickness is 0.085 to 1.000 "(2.2 to 25.4 mm). Tubes of other sizes may be supplied provided they meet all other requirements in this specification.
