Generally used in heating surface tubes, headers, economizers, superheaters, reheaters, etc. of high-pressure boilers (working pressure is generally not greater than 9.8Mpa, working temperature is between 450℃-650℃). (P＜9.8MPa,450℃)
It is often suitable for seamless carbon steel boiler and superheater steel pipes with minimum wall thickness for high pressure. Carbon steel boiler tube grade: A192
Carbon steel boiler tube mechanical properties:
| Tensile strength (MPa) | Yield strength (MPa) | Elongation( % ) | hardness |
|
≥325 |
≥180 |
≥35 |
≤77HRB |
Carbon steel boiler tube hardness requirements:
| Brinell hardness | Rockwell hardness |
|
S≥5.1mm |
S |
|
≤137 HB |
≤77 HRB |
| Boiler tube standards | Trademark | Chemical composition of carbon steel boiler tubes |
- |
||||||||
|
C |
Si |
Mn |
P |
S |
Cr |
Mo |
Cu |
Ni |
V> |
||
|
ASTM A192ASME SA192 |
A192 |
0.06-0.18 |
≤0.25 |
0.27-0.63 |
≤0.035 |
≤0.035 |
/ |
/ |
/ |
/ |
/ |
Dimensional tolerance of carbon steel boiler tubes:
| Boiler tube types | Carbon steel boiler tube outer diameter (D) | Carbon steel boiler tube wall thickness (S) | ||
| Outer diameter size (mm) | Allowable deviation (mm) | Outer diameter size (mm) | Allowable deviation (mm) | |
| Hot rolled boiler tube |
≤101.6 |
+0.4～-0.8 |
76～168.3 |
+28%～0 |
|
>101.6～168.3 |
+0.4～-1.2 |
|||
| Cold drawn boiler tube |
- |
+0.10 |
≤38.1 |
+20%～0 |
|
25.4～38.1 |
+0.15 |
|||
|
>38.1～ |
+0.20 |
>38.1 |
+22%～0 |
|
