A leading manufacturer of Seamless Boiler Steel Tubes in China, offers high quality Steel Heat Exchanger Tubes,Seamless Carbon Boiler Tube,Alloy Steel Boiler Tube
Seamless Boiler Steel Tubes are produced by Cold Drawn Seamless Processing,
with steel grade of Low Carbon Steel, Medium Carbon Steel, Alloy Steel etc.
Technical Standards as
ASTM A179, ASTM A192, ASTM A210, ASTM A213, ASTM A334, ASTM A335 etc
DIN17175, EN10216-2, GB/T 5310, BS3059, etc.
Steel Grade:
Carbon Steel Grade:
ST35.8, ST37.0, ST44, ST52;
E155, E195, E215, E235, E275, E355;
195GH, P235GH, P265GH, P195TR1, P195TR2, P235TR1, P235TR2, P265TR1, P265TR2;
SAE1010, SAE1020, SAE1026, SAE1035, SAE1045;
Carbon steel tube: SA178, A179, A192, A210, SA213, SA214, etc.
Alloy Steel Grade:
T2, T5, T9, T11, T12, T17, T21, T22, T91,T92, 15Mo3,16Mo3, 13CrMo44;
SAE4130, SAE4140, 40Cr, 40Cr4, 10CrMo910, 12CrMo910, 11CrMo910,
25CrMo4, 35CrMo, 35CrMo4, 42CrMo4, 34CrMo4, 20MnV, 20MnV6,20CrMn,12Cr1MoVG;
Product Name:TORICH GB/T20409 20G 20MnG 25MnG SA210 SA213 Multi-rifled High-pressure Boiler Seamless Steel Tubes
Standard: GB/T20409
OD: 3-420mm
WT: 0.5-50mm
Length: 8-12m or according to customers' actual application and production.
Application:High-pressure Boiler
Steel Grade:20G 20MnG 25MnG SA210 SA213
Technology:Hot rolled,cold rolled,cold drawn
Characteristic:
Good concentricity
Good surface quality
Good OD and ID tolerance
High Precision
Stable quality
Smooth Roughness
TORICH QUALITY ASSURANCE
Table6 Longitudinal mechanical properties of internal screw tubes at room temperature
| Number | Grade | tensile strength RM MPa(N/mm2 ) | Lower yield strength
ReL /MPa((N/mm2) | Elongation A/% | Impact energy AKV /J |
| Not less than |
| 1 | 20G | 410~550 | 245 | 24 | 35 |
| 2 | 20MnG | ≥415 | 240 | 22 | 35 |
| 3 | 25MnG | ≥485 | 275 | 20 | 35 |
| 4 | 12CrMoG | 410~560 | 205 | 21 | 35 |
| 5 | 15CrMoG | 440~640 | 235 | 21 | 35 |
Table4 The grade and chemical composition of steel
| Number | Brand | chemical composition(mass fraction)/ % |
| C | Mn | Si | Cr | Mo | S | P |
| 1 | 20G | 0.17~0.23 | 0.35~0.65 | 0.17~0.37 | -- | -- | ≤0.020 | ≤0.025 |
| 2 | 20MnG | 0.17~0.23 | 0.70~1.00 | 0.17~0.37 | -- | -- | ≤0.020 | ≤0.025 |
| 3 | 25MnG | 0.22~0.29 | 0.7~1.00 | 0.17~0.37 | -- | -- | ≤0.020 | ≤0.025 |
| 4 | 12CrMoG | 0.08~0.15 | 0.40~0.70 | 0.17~0.37 | 0.40~0.70 | 0.40~0.55 | ≤0.020 | ≤0.025 |
| 5 | 15CrMoG | 0.12~0.18 | 0.40~0.70 | 0.17~0.37 | 0.80~1.10 | 0.40~0.55 | ≤0.020 | ≤0.025 |
| Note1:Residual element content of 20G.20MnG.25MnG should satisfy: Cu≤0.20%.Cr≤0.25%.Ni≤0.25%.V≤0.08%.Mo≤0.15%;The remaining elements of other brands should satisfy: Cu≤0.20%.Ni≤0.30%. Note2:The acid soluble aluminum in 20G steel should not be more than 0.010%. Note3:The nitrogen content of the steel produced by the oxygen converter plus the refining of the furnace should not be more than 0.008%. |
The size of the internal screw tubes and the allowable deviation of the thread parameters
| Code | Project | [A" teeth types allowable deviation | [B" teeth types allowable deviation |
| A | O.D≤38.1mm 38.1mm＜O.D＜50.8mm 50.8mm≤O.D≤63.5mm O.D≥63.5mm | ±0.15mm ±0.20mm ±0.25mm ±0.30mm | -- |
| B | O.D≤38.1mm 38.1mm＜O.D＜50.8mm 50.8mm≤O.D≤63.5mm O.D≥63.5mm | -- | ±0.15mm ±0.20mm ±0.25mm ±0.30mm |
| C | I.D of the root of the screw Thread: O.D-(1.11×Minimum W.T×2) O.D≤38.1mm 38.1mm＜O.D＜50.8mm 50.8mm≤O.D≤63.5mm O.D≥63.5mm | ±0.15mm ±0.20mm ±0.25mm ±0.30mm | ±0.15mm ±0.20mm ±0.25mm ±0.30mm |
| E | Minimum I.D | Negative deviation to zero | Negative deviation to zero |
| F | Minimum W.T | +22% 0 | +22% 0 |
| G | Thread tips | -- | -- |
| I | Thread top width | -- | -- |
| Ja | Height of thread: O.D≤38.1mm 38.1mm＜O.D＜50.8mm 50.8mm≤O.D≤63.5mm O.D≥63.5mm | ±0.3mm | ±0.18mm ±0.20mm ±0.23mm ±0.28mm |
| K | Side Angle of thread. | ±15° | ±15° |
| O | radius of rounded corner at the root of thread | -- | -- |
| M | Thread pitch | ±3.2mm | ±3.2mm |
| N | Thread lead | ±3.2mm×thread tips | ±3.2mm×thread tips |
| Qb | Helix angle | Rating | Rating |
| T | Thread top width (axial) | ±1.3mm | ±1.3mm |
| U | Thread top (axial) groove width | -- | -- |
| a. For the B type, the maximum deviation of any thread height can exceed the allowable deviation specified in the table, but it should not exceed the allowable deviation of 0.08mm, and the average height of all threads should be in line with the given deviation range. b. The rating is based on the axis of the pipe. |
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