DIN 17175 13CrMo44 Steel Seamless Boiler Tube High Pressure Application
DIN 17175 seamless boiler tube cover several grades: St35.8, St45.8, 15Mo3, 13CrMo44, 10CrMo910. DIN 17175 13CrMo44 seamless boiler tubes are heat-resistant steel tubes commonly used in construction projects, such as boilers, pipelines, and pressure vessels, where high-temperature resistance and durability are essential.
DIN 17175 Steel Seamless Tube Manufacturing process:
A. Hot Rolling:
- A billet (solid cylindrical steel block) is heated to a high temperature.
- The billet is pierced and elongated into a hollow shape with the help of a mandrel.
- The tube is rolled into the specified dimensions and reduced for uniform wall thickness.
B. Cold Drawing (Optional):
- To achieve precise dimensions or finer surface finishes, the hot-rolled tubes may undergo a cold drawing process.
- In this process, the tube is pulled (drawn) through a die to reduce its diameter and achieve tighter tolerances.
DIN 17175 Steel Seamless Tube Chemical Composition:
Grade | C | Si | Mn | P | S | Cr | Mo | Ni% max |
St35.8 | ≤0.17 | 0.10-0.35 | 0.40-0.80 | ≤0.040 | ≤0.040 | / | / | - |
St45.8 | ≤0.21 | 0.10-0.35 | 0.40-1.20 | ≤0.040 | ≤0.040 | / | / | - |
15Mo3 | 0.12-0.20 | 0.10-0.35 | 0.40-0.80 | ≤0.035 | ≤0.035 | / | 0.25-0.35 | 0,25- 0,35 |
13CrMo44 | 0.10-0.18 | 0.10-0.35 | 0.40-0.70 | ≤0.035 | ≤0.035 | 0.70-1.10 | 0.46-0.65 | 0.45- 0.65 |
10CrMo910 | 0.08-0.15 | ≤0.50 | 0.40-0.70 | ≤0.035 | ≤0.035 | 0.20-0.25 | 0.90-1.20 | 0.90- 1.20 |
DIN 17175 Steel Seamless Tube Mechanical Property
DIN 17175 Steel Grade | Yield Strength (Mpa) | Tensile Strength (Mpa) | Elongation(%) |
St35.8 | ≥235 | 360-480 | 25 |
St45.8 | ≥255 | 410-530 | 21 |
15Mo3 | ≥275 | 450-600 | 20 |
13CrMo44 | ≥290 | 440-590 | 20 |
10CrMo910 | ≥280 | 450-600 | 18 |
DIN 17175 Steel Seamless Tube Equivalent Grade
Execution | Norm | Steel grade | Execution | Norm | Steel grade |
Welded | DIN 1626 | St.37.0 | Welded | DIN EN 10217-1 | P235TR2 |
Welded | DIN 1626 | St.52.2 | Welded | DIN EN 10217-3 | P355N |
Seamless | DIN 1629 | St.37.0 | Seamless | DIN EN 10216-1 | P235TR2 |
Seamless | DIN 1629 | St.52.2 | Seamless | DIN EN 10216-3 | P355N |
Seamless | DIN 17175 | St.35.8/1 | Seamless | DIN EN 10216-2 | P235GH |
Seamless | ASTM A106* | Grade B | Seamless | DIN EN 10216-2 | P265GH |
Seamless | ASTM A333* | Grade 6 | Seamless | DIN EN 10216-4 | P265NL |
DIN 17175 Steel Seamless Tube Delivery Conditions (heat treatment)
- Normalizing
- Subcritical annealing
- Hardening and tempering with continuous cooling from the hardening temperature and subsequent tempering.
- Hardening and tempering with isothermal transformation.
Applications
1. Boiler Systems
- Purpose: These tubes are ideal for constructing boiler piping systems that operate under high pressure and temperature.
- Use: Superheater tubes, reheater tubes, economizer tubes, and boiler pressure components.
- Example: Steam boilers in power plants and industrial boiler systems.
2. Heat Exchangers
- Purpose: Used in heat exchanger systems for efficient heat transfer in high-temperature environments.
- Use: Ideal for petrochemical industries, oil refineries, and thermal plants.
- Example: Heat transfer tubes in oil refineries.
3. Pressure Vessels
- Purpose: Constructing pressure vessels that handle steam, gases, and fluids at elevated temperatures.
- Use: Delivers durability and strength against high internal pressures.
- Example: Storage tanks for superheated water or chemicals.
4. Power Generation
- Purpose: Backbone material for steam or gas turbines requiring a robust and temperature-resistant medium.
- Use: Power plants utilize them for energy conversion systems.
- Example: Coal-fired and nuclear power plants.
5. Oil & Gas Industry
- Purpose: Suitable for pipelines and tubing systems that transport corrosive fluids or work in extreme temp zones.
- Use: Seamless tubes act as risers, conveyors, and processing units.
- Example: Offshore gas exploration projects.
6. Engineering & Construction
- Purpose: Used in high-temperature industrial processes, piping frameworks, and support structures.
- Use: Framework for furnaces, high-temperature tunnels, etc.
- Example: Industrial kilns & chemical processing reactors.
7. Aerospace Industry
- Purpose: Utilized in high-stress, high-temperature environments.
- Use: Structural parts and piping systems in aerospace vehicles.
- Example: High-temperature exhaust and heating systems.
