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DIN 17175 Seamless Steel Tubes For Elevated Temperature
The applicable range of DIN 17175 standard. Headers of heat-resistant steel. Seamless steel tubes are suitable for boilers, pipe-lines, pressure vessels and equipment for service up to 600℃and at simultaneous high pressures. Steel grade: St35.8, St45.8, 17Mn4, 19Mn5, 15Mo3, 13CrMo44,10CrMo910, 14MoV63, 20XCrMoV21.
Description
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DIN 17175 Seamless Steel Tubes For Elevated Temperature
DIN 17175 standard applies to seamless tubes including for headers of heat-resistant steel 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.
Chemical composition and mechanical properties at room temperature of DIN 17175 standard
Major Grade | C | Si | Mn | P&S | Cr | Mo | Tensile strength | Yield strength | Elongation % |
St35.8 | ≤0.17 | 0.10-0.35 | 0.40-0.80 | ≤0.040 | - | - | 360-480 | ≥235 | ≥25 |
St45.8 | ≤0.21 | 0.10-0.35 | 0.40-1.20 | ≤0.040 | - | - | 410-530 | ≥255 | ≥21 |
17Mn4 | 0.14-0.20 | 0.20-0.40 | 0.90-1.20 | ≤0.040 | ≤0.30 | - | 460-580 | ≥270 | ≥23 |
19Mn5 | 0.17-0.22 | 0.30-0.60 | 1.00-1.30 | ≤0.040 | ≤0.30 | 510-610 | ≥310 | ≥19 | |
15Mo3 | 0.12-0.20 | 0.10-0.35 | 0.40-0.80 | ≤0.035 | - | 0.25-0.35 | 450-600 | ≥270 | ≥22 |
13CrMo44 | 0.10-0.18 | 0.10-0.35 | 0.40-0.70 | ≤0.035 | 0.70-1.10 | 0.45-0.65 | 440-590 | ≥290 | ≥22 |
10CrMo910 | 0.08-0.15 | ≤0.50 | 0.40-0.70 | ≤0.035 | 2.00-2.5 | 0.90-1.20 | 450-600 | ≥280 | ≥20 |
Permissible wall thickness deviation for outside diameters
da≤130mm | 130mm<da≤320mm | 320mm<da≤660mm | ||||||
≤2*Sn | ≤2*Sn<s≤4*Sn | >4*Sn | ≤0.05da | ≤0.05da<s≤0.11da | >0.11da | ≤0.05da | ≤0.05da<s≤0.09da | >0.09da |
+15% -10% | +12.5% -10% | +9% -9% | +17.5% -12.5% | +12.5% -12.5% | +10% -10% | +22.5% -12.5% | +15% -12.5% | +12.5% -10% |
Note: Sn=nominal wall thickness according to DIN2448 | ||||||||
Permissible wall thickness deviation for inside diameters di ≥200mm to ≤720mm
≤0.05da | 0.05<s≤0.10da | >0.10da |
+22.5% -12.5% | +15% -12.5% | +12.5% -10% |
Permissible deviations on length
For orders specifying | Permissible deviations on length in mm |
Random lengths | +/-500 |
Exact lengths, L≤6m | +/-10 |
Exact lengths, 12m≤L<6m | +/-15 |
Exact lengths, L>12m | Subject to agreement |
Production methods of DIN 17175 seamless steel tubes for elevated temperature
All steel tubes in this specification shall be manufactured by hot rolling, hot drawing,hot pressing, cold drawing and cold rolling.The production methods can be chosen by buyers unless otherwise specified.
The conditions of delivery
All steel tubes under DIN 17175 shall be delivered after proper heat treatment. Usually, the steel tubes of grade St35.8, St45.8, 17Mn4, 19Mn5, 15Mn3 after proper heat treatment can reach the client's requirements. The steel tubes of grade 13CrMo44, 10CrMo910 after tempering and the steel tubes of grade 14MoV63, 20XCrMoV21 after quenching and tempering shall be delivered.
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