DIN 17175 Seamless Tubes of Heat-Resistant Steels

DIN 17175 Seamless Tubes of Heat-Resistant Steels

DIN 17175
Seamless Tubes of Heat-Resistant Steels

Scope: This standard applies to seamless tubes including tubes for headers of heat-resistant steels 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 total stress and the relevant scaling conditions can raise or lower the temperature limit.

Application: It is used for the pipelines of boiler industry and as Economizer tube, Water wall tube, Superheater tube and Reheatertube etc.

Main Steel Tube Grade:
DIN 17175 Grade St35.8
DIN 17175 Grade St45.8
DIN 17175 Grade 15Mo3
DIN 17175 Grade 13CrMo44
DIN 17175 Grade 10CrMo910
DIN 17175 Grade 14MoV63
DIN 17175 Grade 12Cr1MoV
Other grade can also be provided after consulting with customers.

Chemical Composition & Mechanical Properties:

Standard
Grade
Chemical Composition (%)
Mechanical Properties
C
Si
Mn
P
S
Cr
Mo
Tensile Strength(Mpa)
Yield Strength(Mpa)
Elongation (%)
DIN17175
St35.8
≤0.17
0.10-0.35
0.40-0.80
≤0.030
≤0.030
/
/
360-480
≥235
≥25
St45.8
≤0.21
0.10-0.35
0.40-1.20
≤0.030
≤0.030
/
/
410-530
≥255
≥21
15Mo3
0.12-0.20
0.10-0.35
0.10-0.80
≤0.030
≤0.030
/
0.25-0.35
450-600
≥270
≥20
13CrMo44
0.10-0.18
0.10-0.35
0.04-0.70
≤0.030
≤0.030
0.70-1.10
0.45-0.65
440-590
≥290
≥20
10CrMo910
0.08-0.15
≤0.50
0.40-0.70
≤0.030
≤0.030
2.00-2.50
0.90-1.20
450-600
≥280
≥18

Permissible wallthickness deviations for orders based on the outside diameters:

da ≤130mm
130mmda ≤320mm
320mmda≤660mm
≤2*Sn
≤2*Sns≤Sn
4*Sn
≤0.5 da
≤0.05 das≤0.11 da
0.11 da
≤0.05 da
0.05 das≤0.09 da
0.09 da
+15%
-10%
+12.5%
-10%
±9%
+17.5%
-12.5%
±12.5%
±10%
+22.5%
-12.5%
+15%
-12.5%
+12.5%
-10%
Note: Sn=Nominal wall thickness according to DIN 2448

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