DIN17175 13CrMo44 Alloy Steel Pipe
13CrMo44 alloy steel pipe is used for low and medium pressure boiler heating surface pipes (generally, the working pressure is not greater than 5.88MPa, and the working temperature is below 450°C). 13CrMo44 steel tubes after adding nickel and chromium have high mechanical properties and corrosion resistance. Therefore, they are mostly used in heating surface pipes, economizers, superheaters, reheaters, petrochemical pipes, etc. in high-pressure boilers (the working pressure is generally above 9.8 Mpa, working temperature 450℃~650℃).
Chemical Composition
|
C |
Si |
Mn |
P |
S |
Cr |
Mo |
|
0.10-0.18 |
0.10-0.35 |
0.4-0.7 |
≤0.035 |
≤0.035 |
0.7-1.1 |
0.45-0.65 |
Physical Property
|
Grade |
Tensile Strength |
Yield Strength |
Enlongation A(％) |
|
13CrMo44 |
440-590 MPa at 20 °C |
290 MPa at 20 °C |
>22 |
Mechanical Property of DIN 17175 13CrMo44 Steel Tubes
| Standard | Grade | Tensile Strength(MPa) | Yield Strength(MPa) | Elongation(%) |
| DIN 17175 | 13CrMo44 | 440-590 | ≥290 | ≥20 |
Heat Treatment Temperature of DIN 17175 13CrMo44 Carbon Tubes
| Grade | Thermal Processing ℃ | Tempering | |
| Quenching Temperature ℃ | Tempering Temperature ℃ | ||
| 13CrMo44 | 1100 to 850°C | 910-940 | 660-730 |
Dimensions Tolerance of DIN 17175 13CrMo44 Welded Pipes
| Project | Standard | Size Range | Tolerance | |||
| Outer Diameter | DIN17175 | Hot Rolled Steel Pipe | OD ≤ 100mm | ± 0.75%( Min ± 0.5mm ) | ||
| OD＞ 100~ 320mm | ± 0.9% | |||||
| Cold Drawn Steel Pipe OD ≤ 120mm | ± 0.6%( Min ± 0.25mm ) | |||||
| Wall Thickness | DIN17175 | OD ≤ 130mm | WT ≤ 2Sn | +15%~-10% | ||
| WT ＞ 2Sn~4Sn | +12.5%~-10% | |||||
| WT ＞ 4Sn | ± 9% | |||||
| 130 ＜ OD ≤ 320mm | WT ≤ 0.05OD | +17.5%~-12.5% | ||||
| 0.05OD ＜ WT ≤ 0.11OD | ± 12.5% | |||||
| WT ＞ 0.11OD | ± 10% | |||||
Heat Treatment
1.Nominal normalizing temperature: 890-940°C.
2.Hold the temperature for several hours.
3.Cooling in the air.
Annealing
1.Nominal Annealing temperature: 680-720°C.
2.Cool slowly in the furance.
3.Maximum Brinell hardness of 180.
Quenching and Tempering(QT)
1.Nominal Hardening temperature: 910-940°C.
2.Hold at this temperature then quench in air.
3.Tempering as soon as possible when the temperature low to ambient.
4.Heat uniformly to the suitable temperature of 650-720°C.
5.keep the material out of the furnace ,then cool in the air.
13CrMo44 Alloy Steel Pipe
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