DIN 17175

DIN 17175 is a standard specification for seamless tubes of heat-resistant steels used in elevated temperatures and high-pressure environments.

It covers various grades of carbon and alloy steel tubes suitable for applications such as boilers, pipelines, and heat exchangers operating at elevated temperatures. The standard specifies the dimensions, technical conditions, and mechanical properties of these tubes, ensuring their suitability for specific industrial purposes.

DIN 17175 standard applies to seamless steel pipes. These pipes can be used to manufacture steam boilers, pipes, pressure vessels and instruments operating at temperatures up to 600 ° C and at high temperatures. Due to the total load and special oxidation conditions, these pipes can be lowered or raised. High listed temperature limits.

Download PDF
DIN 17175-79 Seamless steel tubes

The standard was first published in 1959 and has been revised several times since then. It sets out the technical requirements for the manufacturing of seamless tubes of heat-resistant steels for elevated temperatures, including chemical composition, mechanical properties, dimensional tolerances, and testing methods, among others.

DIN 17175 applies to seamless tubes used in the construction of boilers, pipelines, and other pressure vessels that are exposed to high temperatures and pressures. The tubes are commonly used in various industries, including power generation, petrochemical, and chemical industries.

Overall, DIN 17175 is an important standard for seamless steel tubes used in high-pressure and high-temperature applications, providing technical specifications and quality requirements for heat-resistant steels used in boilers and heat exchangers.

DIN 17175 seamless steel pipes are widely used in heat exchange appliances. DIN 17175 alloy steel pipe is just a big class,and it has many classifications.

What is DIN 17175 standard?

The DIN 17175 standard is a technical specification developed by the Deutsches Institut für Normung (German Institute for Standardization) for seamless tubes made from heat-resistant steels. These tubes are intended for use in high-temperature and high-pressure environments, such as in boilers, pipelines, and heat exchangers. The standard outlines the requirements for dimensions, technical conditions, and mechanical properties of these tubes, ensuring their suitability and reliability in various industrial applications involving elevated temperatures.

DIN 17175 alloy steel pipe is just a big class,and it has many classifivations. We mainly produce DIN 17175 ST35.8,DIN 17175 ST45.8, and 10CrMo910 steel pipes. This alloy steel pipe is just a big class,and it has many classifivations.

We mainly produce DIN 17175 ST35.8, DIN 17175 ST45.8 and 10CrMo910 steel pipes.

Field of application

For high middle, low pressure boiler and pressure purpose

Delivery Conditions

The tubes shall be supplied suitably heat treated over their entire length. The following heat treatment shall be used, depending on the type of steel:

What material is DIN 17175?

DIN 17175 standard covers a range of materials known as heat-resistant steels, which are specifically designed to maintain their mechanical properties and structural integrity at elevated temperatures. These materials include various alloy and non-alloy steel grades, such as 15Mo3, 13CrMo44, 10CrMo910, and others.

Chemical Compositions of DIN 17175

Grade C Si Mn P S Cr Mo
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
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
10CrMo910 0.08-0.15 ≤0.50 0.40-0.70 ≤0.035 ≤0.035 0.20-0.25 0.90-1.20

What is DIN 17175 ST 35.8 equivalent to ASTM?

DIN 17175 ST 35.8 is equivalent to ASTM A179.
Both standards specify seamless carbon steel tubes for heat-exchanger and condenser purposes. The materials have similar properties and are used in similar applications, especially in the context of high-temperature and heat-transfer environments.

Mechanical Properties of DIN17175

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 equivalent ASTM

The DIN 17175 standard has various equivalents in ASTM standards for seamless tubes used in high-temperature and heat-exchanger applications. Here are a few examples:

  1. DIN 17175 St35.8 is equivalent to ASTM A179.
  2. DIN 17175 St45.8 is equivalent to ASTM A210.
  3. DIN 17175 15Mo3 is equivalent to ASTM A335 P1.
  4. DIN 17175 13CrMo44 is equivalent to ASTM A335 P12.
  5. DIN 17175 10CrMo910 is equivalent to ASTM A335 P22.

Please note that these equivalences depend on the specific grade and intended application. It's recommended to refer to the specific material specifications for accurate equivalences.

St 35 material properties

The material St35, which is part of the DIN 17175 standard, refers to a low carbon steel used for seamless tubes in high-temperature and heat-exchanger applications. Here are some general material properties of St35:

  1. Chemical Composition:
    • Carbon (C): 0.17% maximum
    • Silicon (Si): 0.10-0.35%
    • Manganese (Mn): 0.40-0.80%
    • Phosphorus (P): 0.040% maximum
    • Sulfur (S): 0.040% maximum
  2. Mechanical Properties:
    • Tensile Strength: 360-480 MPa (depending on tube diameter)
    • Yield Strength: 235 MPa minimum
    • Elongation: 25% minimum
    • Hardness: Not specified
  3. Physical Properties:
    • Density: 7.85 g/cm³
    • Melting Point: Approximately 1420-1460°C (2590-2660°F)

It's important to note that the mechanical properties can vary based on factors such as heat treatment and manufacturing processes.

The same effective standards and reference materials


As far as this standard is concerned, steels that have a good mechanical properties at a higher temperature, up to 6 00 °C, and even under long-term load, are called heat-strength steels.

Marking and ordering

The steel grade or material number should be written to the abbreviation of the product as shown in the following example:

Example 1:

A DIN 17175 outer diameter 3 8mm, wall thickness 2.5 mm mm steel grade ST35.8 material, number 1.03 0 5 seamless steel pipe whose name is written: steel pipe DIN 17175-ST35.8 - 38 × 2.5 or steel pipe DIN 17175 -1.0305 - 3 8 × 2 . 5

When ordering goods, except for the above-mentioned requirements, the total length required and the required acceptance test certificate should be stated. If it is a non-incorporated steel pipe, the quality level should be stated.


Production method

The steel pipe to which this standard relates may be produced by hot rolling, cold rolling, hot pressing, hot drawing or cold drawing.

The tube steel can be smelted in a flat furnace or an electric furnace according to the oxygen blowing method, and all steels should be cast in a static manner.

Supply status

The full length of the steel pipe shall be delivered through a suitable heat treatment. According to each steel type, heat treatment includes:

- normal fire
- Retirement
- tempering; from the quenching temperature, it is not cold, but then tempered as well as
- Adjust the mass by the isothermal transformation method.

If a satisfactory uniform crystal structure is produced after hot work, the appropriate heat treatment for St35.8, St45.8, 17Mn4, 19Mn5, and 15 Mn3 steels is considered to have been met. Under the same premise, the 13CrMo44 and 10CrMo910 steels will be tempered to replace the complete quenching and tempering treatment. In any case, 14MoV63 and 20XcrMoV121 steels are supplied after tempering treatment.

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%

Process performance

The tube should meet the requirements of the ring test. For the expansion rate (diameter change) of the ring-shaped flaring experiment, no impermissible defects (such as cracks, crepe, folding, and delamination) shall occur during the test.

Surface condition

The tube must have a manufacturing method that achieves a relatively smooth inner and outer surface, so that it is possible to use either a hot rolling method or a cold rolling method. Tubes should not have unacceptable cracks, creases and folds. As long as the wall thickness of the steel pipe does not exceed the allowable dimensional deviation, and does not affect the performance of the steel pipe, it is permissible to create some uneven and shallow longitudinal scratches during the manufacturing process. Mechanical machining (such as buffing) can be used to remove the slight subsidence of the surface, but not to reduce the minimum allowable wall thickness.

Heat treatment and processing

Reference data for heat treatment temperature
Hot working is possible from 1100 to 80 ° °C, and the temperature can be reduced to 750 °C during processing.
In the matching-correction work of the local department, attention should be paid to the effective specification of hot work; there should be a supervisory temperature system. In the higher temperature range, ie 1100 to 900 °C, it is suitable for forging and pier thickening, about 85 °C, and the temperature can be lowered to above 75 °C during the processing.
For example, before the last process, or during the same hot working process, if the heating temperature of the workpiece is above the normalizing temperature but not more than 1000 ° C, and the deformation process is above 75 ° C, or ———— In the last process, the degree of deformation does not exceed 5% - at the end of 7 00 °C, then the normalizing of the St35.8, St45.8, 17Mn4, 19Mn5, and 15Mo3 steels is superfluous. The 13CrMo44 and 10CrMo910 only need to be tempered.
For multiple times and/or long time heat treatments at temperatures around 1000 to 1000 °C, the workpiece should be cooled to around 350 °C before the last deformation process. If the normalizing or quenching and tempering treatment is more than enough, then the temperature at which the steel is hot-worked should not exceed 1 000 °C.
Conversely, if the molding end temperature is above 10 °C, then the St35.8, St45.8, 17Mn4, 19Mn5, and 15Mo3 steels must be normalized, while the 13CrMo44 and 10CrMo910 should be tempered.
14MoV63 and X20CrMoV121 steels should be reconditioned after hot work.

Pipes made of steel according to this standard may be cold-worked, such as pipe bending, flaring, drawing and pipe cutting; for X20CrMoV121 and 14CrV63 steels, the high yield point and tensile strength shall be noted. After bending, expanding, and cold drawing with normal deformation, there is no need to supplement the heat treatment.

【H】 Ceramic lined pipe

Ceramic lined pipe is made through self-propagating high-temperature synthesis (SHS) technique.

【H】 Cast basalt lined steel pipe

Cast basalt lined steel pipe is composed by lined with cast basalt pipe, outside steel pipe and cement mortar filling between the two layers.

【H】 Ceramic Tile Lined Pipes

Ceramic tile lined pipes have very uniform coating of specially formulated ceramic material that is affixed to the inner of the pipe.

【H】 Rare earth alloy wear-resistant pipe

The material of the rare earth alloy wear-resistant pipe is ZG40CrMnMoNiSiRe, which is also the grade of rare earth alloy steel.

【H】 Tubes Erosion Shields

Tubes Erosion Shields are used to protect boiler tubing from the highly erosive effects of high temperatures and pressures thereby greatly extending tube life.

【H】 ASTM A213 T91 Alloy Tube

The ASTM A213 T91 seamless tubes are primarily used for boiler, superheater, and heat-exchanger.

Ni-Hard Wearback Pipes Ni-Hard Wearback Pipes