OEM Factory for Pipe Galvanized/Painted/Oil and Gas/Boiler/Hot Rolled/High Pressure Seamless Steel Tube/ Pipe
Short Description:
GB 3087 20# seamless steel tubes is widely used for manufacturing heating-pipeliners, containers, steaming pipeliners of low-medium pressure boilers.
Our company insists all along the quality policy of “product good quality is base of enterprise survival; buyer fulfillment will be the staring point and ending of an company; persistent improvement is eternal pursuit of staff” and also the consistent purpose of “reputation very first, shopper first” for OEM Factory for Pipe Galvanized/Painted/Oil and Gas/Boiler/Hot Rolled/High Pressure Seamless Steel Tube/ Pipe, Base about the small business concept of Quality very first, we wish to satisfy much more and a lot more close friends from the word and we hope supply the very best product and service to you.
Our company insists all along the quality policy of “product good quality is base of enterprise survival; buyer fulfillment will be the staring point and ending of an company; persistent improvement is eternal pursuit of staff” and also the consistent purpose of “reputation very first, shopper first” for China Steel Pipe and Seamless Steel Tube, Due to the stability of our goods, timely supply and our sincere service, we have been able to sell our products not only over the domestic market, but also exported to countries and regions, including the Middle East, Asia, Europe and other countries and regions. At the same time, we also undertake OEM and ODM orders. We are going to do our best to serve your company, and establish a successful and friendly cooperation with you.
Manufacture: Seamless process ,Hot-finished or Cold-finished.
Wall thickness(WT): 3.2 mm——21 mm.
Outer diameter (OD): 33 mm——323 mm.
Length: 6M or specified length as required.
Ends: Plain End, Beveled End, Treaded.
Port of Shipment: Tianjin, China.
Payment Terms:T / T, LC.
Delivery: 7-15 days after payment.
Surface: Tubes will be varnished (Outside only) to prevent rust.
Marking: Standard + Steel Grade + Size + Heat No + Lot No.
Package: Bundles (hexagonal),Wooden Boxes,Crates (steel/wooden) or as required.
(1)Method of manufacturing steel
Steel are manufactured by electric furnace, oxygen converter or open hearth method.
(2)Manufacturing method of tube blank
The tube blank can be produced by a hot rolling method, and a continuous casting billet or a steel ingot can also be used.
(3)Manufacturing method of steel pipe
The steel pipe can be manufactured by a hot rolling (extrusion, expansion) or cold drawing (rolling) seamless method.
|
Standard |
Steel Grade |
C |
Si |
Mn |
S |
P |
Cr |
|
GB 3087 |
10 |
0.07-0.13 |
0.17-0.37 |
0.35-0.65 |
0.02 |
0.025 |
≤0.15 |
|
20 |
0.17-0.23 |
0.17-0.37 |
0.35-0.65 |
0.02 |
0.025 |
≤0.25 |
|
Standard |
Steel pipe |
Wall thickness |
Tensile strength |
Yield Strength |
Elongation |
|
(mm) |
(MPa) |
(MPa) |
% |
||
|
|
|
≥ |
|||
|
GB3087 |
10 |
/ |
335-475 |
195 |
24 |
|
20 |
＜15 |
410-550 |
245 |
20 |
|
|
≥15 |
225 |
||||
|
Type of steel pipe |
Outer diameter(mm) |
Tolerance |
||
|
ordinary |
advanced |
|||
|
Hot rolled tube |
OD |
≤159 |
±10%（min±0.50mm） |
±0.75%(min±0.40mm) |
|
＞159 |
±1.0% |
±0.90% |
||
|
WT |
≤20 |
＋15.0%(min＋0.45mm) |
±10%（min±0.30mm) |
|
|
＞20 |
±12.5% |
±10% |
||
|
OD≥351 |
±15% |
|||
|
Cold drawn tube |
OD |
10～30 |
±0.40mm |
±0.20mm |
|
＞30～50 |
±0.45mm |
±0.25mm |
||
|
＞50 |
±1.0% |
±0.75% |
||
|
WT |
1.5～3.0 |
+15% |
±10% |
|
|
＞3.0 |
+12.5% |
±10% |
||
(1)Hydraulic test
The steel pipe should be hydraulically tested one by one.
(2)Flattening test
Steel pipes with an outer diameter of more than 22mm to 400mm and a wall thickness of not more than 10mm shall be subjected to a flattening test.
(3)Flaring test
The steel pipe with a wall thickness of not more than 8 mm can be subjected to a flare test with a top taper of 30°, 45° or 60°.
(4) Bending test
Steel pipes with an outer diameter of not more than 22 mm will be subjected to a bending test.
(5)Non-destructive testing
According to the requirements of the purchaser, the steel pipe will be ultrasonically tested one by one.
The inner and outer surfaces of the steel pipe do not have cracks, folds, creases, crusting or separation, and these defects should be completely removed. The clearance depth shall not exceed the negative deviation of the nominal wall thickness, and the actual wall thickness at the cleaning site shall not be less than the minimum allowed by the wall.
The packaging, marking and quality specifications of steel pipes shall comply with the provisions of GB/T 2102.
Our company insists all along the quality policy of “product good quality is base of enterprise survival; buyer fulfillment will be the staring point and ending of an company; persistent improvement is eternal pursuit of staff” and also the consistent purpose of “reputation very first, shopper first” for OEM Factory for Pipe Galvanized/Painted/Oil and Gas/Boiler/Hot Rolled/High Pressure Seamless Steel Tube/ Pipe, Base about the small business concept of Quality very first, we wish to satisfy much more and a lot more close friends from the word and we hope supply the very best product and service to you.
OEM Factory for China Steel Pipe and Seamless Steel Tube, Due to the stability of our goods, timely supply and our sincere service, we have been able to sell our products not only over the domestic market, but also exported to countries and regions, including the Middle East, Asia, Europe and other countries and regions. At the same time, we also undertake OEM and ODM orders. We are going to do our best to serve your company, and establish a successful and friendly cooperation with you.
