DIN17175 St35.8 Seamless Tubes for Boilers，Wuxi Xingye special steel

1. WUXI XINGYE SPECIAL STEEL CO., LTD
DIN17175 St35.8 Seamless Tubes for
Boilers
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
Mechanical Properties
Tensile Strength , MPa Yield Strength, MPa Elongation, %
360-480 235 min 25 min
Standard Grade
Chemical Components (%)
C Si Mn P S Mo Cr
DIN17175
St 35.8 ≤0.17 0.10-0.35 0.40-0.80 ≤0.040 ≤0.040 / /
St 45.8 ≤0.17 0.10-0.35 0.40-0.80 ≤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
0.45-
0.65
0.70-
1.10
10CrMo910 0.08-0.15 ≤0.50 0.40-0.70 ≤0.035 ≤0.035
0.90-
1.20
2.0-
2.50

2. WUXI XINGYE SPECIAL STEEL CO., LTD
Outside Diameter & Tolerance
Outside Diameter, mm Tolerance, %
OD≤120 ±0.6, 0.25mm min
OD>120 ±0.75
Wall thickness & Tolerance
Outside Diameter , mm Wall Thickness, mm Tolerance, %
OD≤130
WT≤2*S(DIN 2448) +15/-10
2*S(DIN 2448)＜WT≤4*S(DIN 2448) +12.5/-10
WT>4*S(DIN 2448) ±9
130＜OD≤320
WT≤0.05*OD +17.5/-12.5
0.05*OD＜WT≤0.11*OD ±12.5
WT>0.11*OD ±10
320＜OD≤660
WT≤0.05*OD +22.5/-12.5
0.05*OD＜WT≤0.09*OD +15/-12.5
WT>0.09*OD +12.5/-10
Mechnical 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 isothermal transformation
 Hardening and tempering with continuous cooling from the hardening temperature and
subsequent tempering.

3. WUXI XINGYE SPECIAL STEEL CO., LTD
Package
1. Bundle package.
2. Bevelled ends or plain ends

4. WUXI XINGYE SPECIAL STEEL CO., LTD
3. Painting vanish coating
4. PVC covered and both ends capped
Our Services:
Third Party Inspection acceptable, such as SGS, BV etc.
Mill test certificates will be issued according to EN10204/3.1B
Get in Touch
If you are interested in our products or cooperate with us, even
having a comment or a suggestion please contact us now, for more
detailed information.
Ms.Freya
Skype: Freya Wong
Email: freya@yeguangsteeltubing.com
Website: www.yeguangsteeltubing.com