The 13CrMo44 alloy tube is primarily a chromium-molybdenum alloy pipe used for low and medium pressure boiler heating surface pipes, with operating pressure typically not exceeding 5.88 MPa and a temperature range below 450°C. This material can be used to manufacture boiler components such as superheated steam pipes, boiling water pipes, and water wall pipes. It is also suitable for high-pressure boiler systems with operating pressures above 9.8 MPa, used in components like economizers, superheaters, and reheaters, and is applicable for petrochemical industrial pipes.
For 13CrMo44 hot-rolled tubes, the piercing-rolling-sizing process must be employed, while for cold-drawn tubes, the deformation must be controlled to avoid microscopic defects. According to the DIN 17175 standard, finished pipes must undergo 100% non-destructive testing (ultrasonic or eddy current) and be subjected to a hydrostatic test (1.5 times the design pressure) on each individual pipe. For pipes with a wall thickness ≥12.5 mm, an additional transverse impact test is required.
Chemical Composition
| Standard | Grade | Chemical Components (%) | ||||||
| C | Si | Mn | P | S | Mo | Cr | ||
| DIN17175 | 13CrMo44 | 0.10-0.18 | 0.10-0.35 | 0.40-0.70 | ≤0.035 | ≤0.035 | 0.45-0.65 | 0.70-1.10 |
Mechanical Properties
| Standard | Grade | Mechanical properties | ||
| Tensile Strength (Mpa) | Yield Strength (Mpa) | Elongation (%) | ||
| DIN17175 | 13CrMo44 | 440-580 | ≥290 | ≥22 |
13CrMo44 (DIN 17175) V.S. A335 P11 (ASME SA335)
| Comparison Item | 13CrMo44 (DIN 17175) | A335 P11 (ASME SA335) |
|---|---|---|
| Standard System | German Standard (DIN) | American Standard (ASME) |
| Main Composition | Chromium (Cr), Molybdenum (Mo) | Chromium (Cr), Molybdenum (Mo) |
| Typical Application | Heating surface pipes for low and medium pressure boilers | High-pressure boilers and high-temperature piping |
| Operating Pressure | Typically ≤5.88 MPa | Typically >9.8 MPa |
| Operating Temperature | Typically <450°C | Typically 450°C - 650°C |
| Manufacturing Process | Hot-rolled/cold-drawn | Hot-rolled/cold-drawn |
| Inspection Requirements | 100% UT/ET + Hydrostatic Test | 100% UT/ET + Hydrostatic Test |
| Impact Test | Transverse impact test required for wall thickness ≥12.5mm | Charpy impact test typically required |
13CrMo44 (DIN 17175) Cold drawing seamless heat exchanger tube factory
