Product Introduction
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.Chemical Composition(%)
Testings
(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.
Product Display
| 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 |
Surface Quality
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.Additional Info
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.Manufacturing Methods
(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.Mechanical Properties
| 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 | ||||
Allowable Deviation Of Outer Diameter And Wall Thickness
| 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) －12.5% －0.35mm) | ±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% | ±10% | |
| ＞3.0 | +12.5% -10% | ±10% | ||
Packaging, Marking And Quality Instructions
The packaging, marking and quality specifications of steel pipes shall comply with the provisions of GB/T 2102.