Project Description

DIN 17175 Seamless Tubes for Boilers

ST35.8, ST45.8, 15Mo3, 13CrMo44, 10CrMo910

Din17175 st35.8, st45.8, 15Mo3, 13CrMo44, 10CrMo910 is the standard applicable to seamless tubes of heat-resistant steels

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DIN17175 ST45.8 Seamless Tubes Inspected and Ready for Packing

DIN17175 ST45.8 Seamless Tubes

DIN 17175 boiler tubes

applies to seamless tubs including tubes for headers of heat-resistant steels according to standard which are used in the construction of boilers, pipe-lines, pressure vessels and equipment for service up to 600 °C and simultaneous high pressures, where the total stress and the relevant scaling conditions can raise or lower the temperature limit.

Manufacturing process

  • Tubes to this standard shall be manufactured by hot or cold rolling, hot pressing, hot or cold drawing
  • The steels used for tubes shall be made by the oxygen blowing process, the open hearth furnace or the electric furnace.
  • All steels shall be killed.

Chemical Composition

StandardGradeChemical Components (%)
DIN17175St 35.8≤0.170.10-0.350.40-0.80≤0.040≤0.040//
St 45.8≤0.170.10-0.350.40-0.80≤0.040≤0.040//


Click to download the MTC of DIN17175 ST35.8.

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Click to download the details of DIN17175 Seamless Boiler Tubes.

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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:

  • Normalizing
  • Subcritical annealing
  • Hardening and tempering with continuous cooling from the hardening temperature and subsequent tempering.
  • Hardening and tempering with isothermal transformation.


Mechanical Properties

StandardGradeMechanical properties
Tensile Strength (Mpa)Yield Strength (Mpa)Elongation (%)
DIN17175St 35.8360-480≥235≥25
St 45.8410-530≥255≥21

Standard: DIN 17175

Description Name: DIN 17175 seamless boiler tubes, DIN17175 ST35.8 Boiler tubes, DIN17175 ST45.8 Boiler tubes, DIN17175 15Mo3 seamless tubes, DIN17175 13CrMo44 seamless tubes, DIN17175 10CrMo910 Seamless tubes, DIN17175 Seamless tubes.

Size: 19mm-350mm

W.T.: 1.5mm-50mm

Shape: Round

Production Type: Cold drawn or Hot rolled

Length: Single random length/ Double random length or as customer’s actual request max length is 10m

Grade: ST35.8, ST45.8, 15Mo3, 13CrMo44, 10CrMo910


  • Tensile test
  • Notch impact/bending test
  • Ring test
  • Non-destructive test
  • Visual inspection of tube surface
  • Gauging
  • Leakage test
  • Grade identification test
  • Hot tensile test


  • the manufacturer’s name or trade mark;
  • the specified dimensions;
  • the number of this European Standard;
  • the steel name or number;
  • the cast number;
  • the delivery condition;
  • Others information by customer’s


  • Mill test certificates will be issued according to EN10204.3
  • The tubes Shall be Seamless cold drawn or hot rolled.

Protection and Packing:

  • Packed in wooden box or bundles protected with plastic paper, and suitably protected for sea-worthily delivery or as requested.
  • The tubes shall be delivered with a temporary corrosion protection. The type of protection shall be at the discretion of the manufacturer


For high middle, low pressure boiler and pressure purpose

Surface treatment:

Antirust oil-dip, Varnish, Passivation, Phosphating, Shot Blasting

Photos for DIN17175 Tubes:

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DIN17175 10CrMo910 Seamless Tubes fixed length cutting

DIN17175 10CrMo910 Seamless Tubes

DIN17175 15Mo3 Seamless Tubes drying after anti-rust oiled

DIN17175 15Mo3 Seamless Tubes

DIN17175 ST35.8 Seamless Tubes packed in bundles with steel strips

DIN17175 ST35.8 Seamless Tubes

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