
YB/T 4674 Q235 Special Shaped Welded Pipe Precision Special Steel Pipe For Automobile
Contact Person : Richard SHEN
Phone Number : +86-13736164628
WhatsApp : +8613736164628
Minimum Order Quantity : | 2 Ton | Price : | 1000-1500 USD/Ton |
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Packaging Details : | packing in wooden boxes or in hexagonal bundles | Delivery Time : | 30-35 work days |
Payment Terms : | L/C, D/A, D/P, T/T, Western Union, MoneyGram | Supply Ability : | 50000Ton per year |
Place of Origin: | Zhejiang,CHINA | Brand Name: | TORICH |
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Certification: | ISO | Model Number: | GB/T20409 |
Detail Information |
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Name: | GB/T20409 20G 20MnG 25MnG SA210 SA213 Multi-rifled High-pressure Boiler Seamless Steel Tubes | Surface: | Oiled |
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Usage: | For High-pressure Boilers | Shape: | Round Shape |
Length: | 8-12m | Material: | 20G 20MnG 25MnG SA210 SA213 |
Type: | Boiler Pipe | WT: | 0.5-50mm |
High Light: | alloy steel seamless pipe,rectangular steel pipe |
Product Description
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
MPa(N/ |
Lower yield strength![]() ![]() |
Elongation A/% |
Impact energy
|
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 | -- | -- |
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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 |
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Helix angle | Rating | Rating |
T | Thread top width (axial) | ±1.3mm | ±1.3mm |
U | Thread top (axial) groove width | -- | -- |
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