DIN 17175 ST35.8 Tubes


DIN 17175 steel pipes are used in boiler installations, high-pressure pipelines and tank construction and special machinery for both high temperature and high-pressure devices. DIN 17175 alloy steel pipe is only a large class, it has many classifications.

We mainly produce DIN 17175 ST35.8, DIN 17175 ST45.8 and 10CrMo910 steel pipe. This alloy steel pipe is only a large class, it has many classifications.


This standard applies to seamless tubes 1) including tubes for headers of heat-resistant steels according to Table 1 which are used in the construction of boilers, pipe-lines, pressure vessels and equipment for service up to 600∩ and at simultaneous high pressures, where the tototal stress and the relevant scaling conditions can raise or lower the temperature limit.

Designation and ordering

5.1. The code numbers for the grades of steel were formed in accordance with Sections and of the Explanations to DIN Normenheft 3, and the material numbers according to DIN 17 007 Part 2.

5.2. The code number or the material number for the steel grade shall be appended to the symbol for the product according to the following examples :

Example 1:

Designation of a seamless steel tubes of 38mm outside diameter and 2.6mm wall thickness according to DIN 2448 of steel St 35.8, material number 1.0385 :

Tabe DIN 2448 – sT 35.8 x 2.6

or Tabe DIN 2448 – 1.0305 – 38 x 2.6

5.3. The order shall not only specify the designation according to Section 5.2 but also in every case the desired total length and the desired acceptance inspection certificate and for unalloyed steel tubes also the steel grade. In addition, further details in compliance with the other Sections marked with a dot(≤) can be agreed at the time of ordering.

DIN 8528 Part 1 Weldability; metallic materials, definitions

Chemical compositions (%) of DIN 17175


Mechanical properties of DIN17175

GradeYield Strength (Mpa)Tensile Strength (Mpa)Elongation(%)

DIN 17175-79 seamless steel tubes for elevated temperatures

Sections marked with a dot(●) contain details on agreements which shall, or may be, reached at the time of ordering.
GradeMfg. ProcessCSiMnPSNiCrMoOthers
14MoV63S0.10-0.180.10-0.350.40-0.700.035Max0.035Max-0.30-0.600.50-0.70V : 0.22-0.32
X20CrMoV121S0.17-0.230.50Max0.40-0.700.030Max0.030Max0.30-0.8010.00-12.500.80-1.20V : 0.25-0.35

Grade  Materia numberTensile Test MPa or N/mm2Remaks(Similar to JIS)Possibility Temperature
Min Yield pointTensile Strength
t 16Max16
St35.81.0305235225360-480Impact Test at Room Temp.kgf-m
St45.81.0405-245410-53023.5(STPT410, STB410)
13CrMo9101.7335295295440-59023.2(STPA22, STBA22)
10CrMo9101.738285285450-60023.2(STPA24, STBA24)

Table1. Summary of heat-resisting steels for seamless tubes, their chamicalcomposition (cast analysis) and colour designation of tubes

Code numberMaterial numberCSiMnPSCrMoNiVColourdesignation 1)
St 35.81.0306÷ 0.170.10 to 0.35 2)0.40 to 0.800.040.04white
St 45.81.0406÷ 0.210.10 to 0.35 2)0.40 to1.200.040.04yellow
17Mn 4 3)1.0481 3)0.14 to 0.200.20 to 0.400.90 to÷ 0.30red
19Mn 5 3)1.0482 3)0.17 to 0.22 4)0.30 to 0.601.00 to 1.300.040.04÷ 0.30yellow
15Mn 31.54150.12 to 0.20 4)0.10 to 0.350.40 to 0.800.0350.0350.25 to 0.35yellow
13CrMo 4 41.73350.10 to 0.18 4)0.10 to 0.350.40 to 0700.0350.0350.70 to 1.100.45 to 0.65yellow
shades or
10CrMo 9 101.7380.08 to 0.15÷ 0.500.40 to 0700.0350.0352.00 to 2.500.90 to 1.20red
14MoV 6 31.77150.10 to 0.180.10 to 0.350.40 to 0.700.0350.0350.30 to 0.600.50 to 0.700.22 to 0.32red
of silver
X20CrMoV 12 11.49220.17 to 0.23÷ 0.50÷ to 12.500.80 to 1.200.30 to 0.800.25 to 0.35blue

ElementLimits quoted in cast analysis
according to Table 1

Weight %
Permissible deviation 1)
of sample analysis from the
limits quoted in the cast
analysis according to Table 1

Weight %
C÷0.24【 0.02
Si÷0.35【 0.03
>0.35÷0.60【 0.04
Mn÷1.00【 0.04
>1.00÷1.30【 0.05
÷0.040【 0.010
Cr÷0.040÷2.00【 0.05
>2.00÷2.50【 0.07
∶1.00÷12.50【 0.15
Mo÷0.30【 0.03
>0.30 ÷1.20【 0.04
Ni0.30÷0.80【 0.03
V0.22÷0.35【 0.03

Table 3. Scope of tests for seamless tubes in both quality grades and authority for the execution of the testings.

NoExtent of testingAccording to SectionQuality grade IQuality grade IIAuthority for the execution of the test 1)
1Tensile test 2)8.4.3on two tubes per batch from the first two batches, on one tube from each subsequent batchon two tubes per batch from the first two batches, on one tube from each subsequent batchS.A.
2Notch impact/bending test 3)8.4.4on tubes according to No.1on tubes according to No.1S.A.
3Ring test 3)8.4.6on one end of the tubes acc to No.1depending on the diameter (see Section 8.4.6) on 20% of the cut or part-lengths at one end or on 100% of the cut or part-lengths at both ends if necessary though also at one end, see Section
4Non-destructive test8.4.7all tubesM.W.
5Visual inspection of tube surface8.4.8all tubesall tubesS.A.
6Gauging8.4.9all tubesall tubesM.W.
7Leakage test8.4.10all tubesall tubesM.W.
8Grade identification test8.4.11all alloy tubesM.W
9Special tests 4) No. 9, No. 108.4.2subject to agreementsubject to agreement.M.W
10Hot tensile test8.4.5unless otherwise agreed 1 sample per cast and size or 1 sample per cast and annealed batch (heattreated batch)unless otherwise agreed 1 sample per cast and size or 1 sample per cast and annealed batch (heattreated batch)S.A.
1) S.A = subject to agreement; M.W. = Manufacturing works.
2) 1 specimen or 1 set of specimens suffices for batch sizes of up to 10 tubes.
3) The particulars on the size range governing the application of these test in Table 14 shall be complied with.
4)≤ Special tests shall be carried out only after agreement between manufacturer and customer.