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The DIN 17175 standard specifies pipes that are heat-resistant and seamless, ideal for use under conditions of increased temperatures and pressures. The standard is pertinent to applications such as constructing boilers, pipe-lines, pressure vessels, and equipment. This guide will delve into the details of the DIN 17175 standard and its various grades.
DIN 17175 Heat-resistant Seamless Steel Pipe
The Deutsches Institut für Normung (DIN) is a German organization responsible for standardizing technical rules for various areas, including materials and product specifications. Among these standards, DIN 17175 is a well-known and widely used standard for heat-resistant seamless steel pipes.
These pipes are predominantly used in applications where the conditions involve high temperatures (up to 600°C) and pressures. It’s important to note that the total stress and the relevant scaling conditions could raise or lower the temperature limit.
The DIN 17175 pipes are made of heat-resisting steels which are comparable to those in use according to international standards. The application of these Pipes is mainly for constructing boilers, pipe-lines, pressure vessels, and equipment in industries such as petrochemical, chemical, and power generation.
DIN 17175 Pipe Grades
The DIN 17175 specification covers several grades, including 10CrMo910, 13CrMo44, 15Mo3, St45.8, and St35.8.
DIN 17175 10CrMo910 Seamless Steel Pipe
The 10CrMo910 steel grade significantly contains Chromium as the main alloying element. The presence of chromium provides this grade with enhanced resistance to corrosion, oxidation, and high temperature. Therefore, the 10CrMo910 seamless steel pipe is generally employed in environments with extreme conditions, such as high-pressure boiler Pipes.
Heat treatment temperature of DIN 17175 10CrMo910 Seamless Steel Pipes
| Steel Grade | Thermal processing ℃ | Normalizing℃ | Tempering | ||
| Grade | Material number | Quenching temperature ℃ | Tempering temperature ℃ | ||
| 10CrMo910 | 1.7380 | 1100 to 850°C | – | 900-960 | 700-750 |
Chemical composition of DIN 17175 10CrMo910
| Standard:DIN 17175 | grade | Chemical composition | |||||
| C | Si | Mn | P、S | Cr | Mo | ||
| 10CrMo910 | 0.08-0.15 | ≤0.50 | 0.40-0.70 | ≤0.030 | 2.00-2.50 | 0.90-1.20 | |
Mechanical property of DIN 17175 10CrMo910
| Standard | grade | Tensile Strength(MPa) | Yield Strength(MPa) | Elongation(%) |
| DIN 17175 | 10CrMo910 | 450-600 | ≥280 | ≥18 |
DIN 17175 13CrMo44 Seamless Steel Pipe
The 13CrMo44 seamless steel pipe is also a grade of steel that contains chromium as a substantial alloying component. This grade is recognized for its high-temperature strength and excellent resistance to oxidation and corrosion, especially in corrosive or high-temperature services. The 13CrMo44 grade is often found in power plants and thermal power plants, where the material is subjected to high temperatures and pressures.
Heat treatment temperature of DIN 17175 13CrMo44 Seamless Steel Pipes
| Steel Grade | Thermal processing ℃ | Normalizing℃ | Tempering | ||
| Grade | Material number | Quenching temperature ℃ | Tempering temperature ℃ | ||
| 13CrMo44 | 1.7335 | 1100 to 850°C | – | 910-940 | 660-730 |
Chemical composition of DIN 17175 13CrMo44
| Standard:DIN 17175 | grade | Chemical composition | |||||
| C | Si | Mn | P、S | Cr | Mo | ||
| 13CrMo44 | 0.10-0.18 | 0.10-0.35 | 0.40-0.70 | ≤0.030 | 0.70-1.10 | 0.45-0.65 | |
Mechanical property of DIN 17175 13CrMo44
| Standard | grade | Tensile Strength(MPa) | Yield Strength(MPa) | Elongation(%) |
| DIN 17175 | 13CrMo44 | 440-590 | ≥290 | ≥20 |
DIN 17175 15Mo3 Seamless Steel Pipe
The 15Mo3 seamless steel pipe is a low-alloy steel containing a relatively high amount of molybdenum. This composition lends the grade excellent wear resistance and a high degree of hardness, making it an ideal choice for boiler Pipes and boiler components. The molybdenum content gives this material a significant level of tensile strength, even at high temperatures.
Heat treatment temperature of DIN 17175 15Mo3 Seamless Steel Pipes
| Steel Grade | Thermal processing ℃ | Normalizing℃ | Tempering | ||
| Grade | Material number | Quenching temperature ℃ | Tempering temperature ℃ | ||
| 15mo3 | 1.5415 | 1100 to 850°C | 910-940 | – | – |
Chemical composition of DIN 17175 15Mo3
| Standard:DIN 17175 | grade | Chemical composition | |||||
| C | Si | Mn | P、S | Cr | Mo | ||
| 15mo3 | 0.12-0.20 | 0.10-0.35 | 0.40-0.80 | ≤0.030 | / | 0.25-0.35 | |
Mechanical property of DIN 17175 15Mo3
| Standard | grade | Tensile Strength(MPa) | Yield Strength(MPa) | Elongation(%) |
| DIN 17175 | 15mo3 | 450-600 | ≥270 | ≥20 |
DIN 17175 St45.8 Seamless Steel Pipe
The St45.8 grade is a medium carbon steel pipe that is mainly used for high-pressure, high-temperature services, such as those found in boilers and pressure vessels. The carbon content in this grade provides it with excellent strength and heat resistance. The St45.8 grade is also known for its superior weldability, making it a popular choice for applications requiring welding.
Heat treatment temperature of DIN 17175 St45.8 Seamless Steel Tubes
| Steel Grade | Thermal processing ℃ | Normalizing℃ | Tempering | ||
| Grade | Material number | Quenching temperature ℃ | Tempering temperature ℃ | ||
| St45.8 | 1.0405 | 1100 to 850°C | 870-900 | – | – |
Chemical composition of DIN 17175 St45.8
| Standard:DIN 17175 | grade | Chemical composition | |||||
| C | Si | Mn | P、S | Cr | Mo | ||
| St45.8 | ≤0.21 | 0.10-0.35 | 0.40-1.20 | ≤0.030 | / | / | |
Mechanical property of DIN 17175 St45.8
| Standard | grade | Tensile Strength(MPa) | Yield Strength(MPa) | Elongation(%) |
| DIN 17175 | St45.8 | 410-530 | ≥255 | ≥21 |
Dimensions Tolerance
| 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% | |||||
DIN 17175 St35.8 Seamless Steel Pipe
The St35.8 seamless steel pipe is a low carbon steel grade, making it an excellent choice for applications where avoiding carbide precipitation is vital. The low carbon content helps prevent the formation of carbide precipitation during welding, making the St35.8 grade desirable for applications involving welding. This grade is typically used in applications requiring high resistance to heat and corrosion.
heat treatment temperature of DIN 17175 St35.8 Seamless Steel Tubes
Hot working is possible from 1100 to 850°C, and the temperature can be reduced to 750 °C during processing.
| Steel Grade | Thermal processing ℃ | Normalizing℃ | Tempering | ||
| Grade | Material number | Quenching temperature ℃ | Tempering temperature ℃ | ||
| St35.8 | 1.0305 | 1100 to 850°C | 900-930 | – | – |
Chemical composition of DIN 17175 St35.8
| Standard | grade | Chemical composition | |||||
| C | Si | Mn | P、S | Cr | Mo | ||
| DIN 17175 | St35.8 | ≤0.17 | 0.10-0.35 | 0.40-0.80 | ≤0.030 | / | / |
Mechanical property of DIN 17175 St35.8
| Standard | grade | Tensile Strength(MPa) | Yield Strength(MPa) | Elongation(%) |
| DIN 17175 | St35.8 | 360-480 | ≥235 | ≥25 |
Features and Applications
DIN 17175 seamless steel pipe has a wide range of properties and applications. Below are some of the main features and application areas.
characteristic
Heat Resistance: These Pipes are designed to withstand high temperatures and pressures, so they have excellent heat resistance. These Pipes can withstand high temperatures and pressures for extended periods of time without losing their performance and strength.
Corrosion resistance: DIN 17175 seamless steel pipe has good corrosion resistance due to the presence of alloying elements such as chromium or molybdenum. This gives these pipes a longer service life when used in corrosive environments.
High Strength: The design of these Pipes makes them very strong and stiff so they can withstand a lot of pressure without losing their shape or structure.
application
DIN 17175 seamless steel pipes are used in many industrial fields. Here are some of the main application areas:
Boilers and Pressure Vessels: Due to their heat and pressure resistance, these Pipes are widely used in the manufacture of boilers and pressure vessels. These devices often operate in environments with high temperatures and pressures and require materials that can withstand these conditions.
Petrochemical Industry: DIN 17175 seamless steel pipes are also widely used in the petrochemical industry for transporting chemicals at high temperatures and pressures.
Electric power industry: Many equipment in the electric power industry, such as steam turbines and thermal power plants, also require the use of such high-strength and heat-resistant pipes.
Conclusion
The DIN 17175 heat-resistant seamless steel pipes are an essential part of many industrial applications, especially those involving high temperatures and pressures. The various grades have different compositions and properties, making them suitable for different applications and environments. It’s the engineer’s responsibility to choose the correct grade based on the operating temperature, pressure, and corrosiveness of the environment. With the right selection, these pipes can ensure the longevity and reliability of the entire system in which they are applied.
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