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GB/T 8163 Seamless Steel Pipes for Liquid Service |
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Standard: GB/T 8163
Equivalent Standard: EN 10216-1, DIN 1629 |
Material: Q345C
Equivalent Material: 16Mn, St52, E355, Q355 |
| Chemistry Composition |
C, % |
Si, % |
Mn, % |
Cr, % |
Ni, % |
S, % |
P, % |
Cu, % |
Mo, % |
0.20 max |
0.50 max |
1.70 max |
0.30 max |
0.50 max |
0.030 max |
0.030 max |
0.30 max |
0.10 max |
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| Mechanical Properties |
Tensile Strength, MPa |
Yield Strength, MPa |
Elongation, % |
470~630 |
345 min |
21 min |
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Order should include standard, product name, steel grade, size, quantity (total weight or total length), delivery condition, special requirements. |
| Outside Diameter & Tolerance |
Type of Steel Pipes |
Allowable Deviation |
Hot Rolled Steel Pipe |
±1%D or ±0.5, whichever is greater |
Thermal Expansion Steel Pipe |
±1%D or ±0.5, whichever is greater |
Cold Drawn Steel Pipe |
±0.75%D or ±0.3, whichever is greater |
Cold Rolled Steel Pipe |
±0.75%D or ±0.3, whichever is greater |
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| Wall thickness & Tolerance |
Type of Steel Pipes |
Outside Diameter, D |
S/D |
Allowable Deviation |
Hot Rolled Steel Pipe |
≤102mm |
- |
±12.5%S or ±0.40mm, whichever is greater |
>102mm |
≤0.05 |
±15%S or ±0.40mm, whichever is greater |
>0.05~0.10 |
±12.5%S or ±0.40mm, whichever is greater |
>0.10 |
+12.5%S/-10%S |
Thermal Expansion Steel Pipe |
- |
+17.5%S/-12.5%S |
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Type of Steel Pipes |
Wall Thickness, S |
Allowable Deviation |
Cold Drawn Steel Pipe |
≤3 |
+15%S/-10%S or ±0.15mm, whichever is greater |
>3~10 |
+12.5%S/-10%S |
>10 |
±10%S |
Cold Rolled Steel Pipe |
≤3 |
+15%S/-10%S or ±0.15mm, whichever is greater |
>3~10 |
+12.5%S/-10%S |
>10 |
±10%S |
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Length |
The typical length of the steel pipe is 3000mm~12000mm. After negotiation with clients, other lengths can be supplied. |
Fixed length or multi-length is not more than 6000mm |
+30/-0mm |
Fixed length or multi-length is greater than 6000mm |
+50/-0mm |
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Straightness |
Steel Pipe Wall Thickness, mm |
Curvature per Meter, mm/m |
≤15 |
≤1.5 |
>15~30 |
≤2.0 |
>30 or D≥351 |
≤3.0 |
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The full-length curvature of the steel pipe should not exceed 0.15‰ of the total length. |
The burrs at the end of the steel pipe should be removed. |
Steel should be smelted by electric arc furnace plus external refining or oxygen blown converter plus external refining. The tube billets can be manufactured by continuous casting, die casting or hot rolling. |
GB/T 8163 specifies the order content, size, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of seamless steel pipes for fluid transportation. GB/T 8163 is applicable to seamless steel pipes for general fluid transportation.
GB/T 8163规定了输送流体用无缝钢管的订货内容、尺寸、外形、重量、技术要求、试验方法、检验规则、包装、标志和质量证明书。GB/T 8163适用于输送普通流体用无缝钢管。 |
Steel pipes shall be manufactured by hot rolled, thermal expansion, cold drawn or cold rolled methods.
Hot rolled and thermal expansion steel pipes are delivered in the delivery condition of hot rolled, thermal expansion or heat treated. Cold drawn and cold rolled steel pipes shall be delivered in an annealed or high temperature tempered delivery condition. According to the contract, cold drawn and cold rolled steel pipes can also be delivered in cold drawn, cold rolled or other heat treated delivery condition. |
There should be no visible cracks, folds, scars and delamination on the inner and outer surfaces of the steel pipes. These defects should be completely removed, the removed depth should not exceed the lower deviation of the wall thickness, and the actual wall thickness at the cleaned area should not be less than the minimum value allowed of the wall thickness. Other local defects not exceeding the deviation under the wall thickness are allowed to exist. |
Type of inspection or test |
Frequency of Testing |
Chemical analysis |
One sample per heat number |
Tensile test |
One sample on each of the two steel pipes per lot |
Impact test |
Three samples on each of the two steel pipes per lot (for low alloy high strength structural steel pipes with an outside diameter of not less than 70mm, and a wall thickness of not less than 6.5mm) |
Flattening test |
One sample on each of the two steel pipes per lot (for steel pipes in grades 10, 20, Q345, Q390, with an outside diameter D>22~600mm, and S/D ratio not greater than 10%) |
Flaring test |
One sample on each of the two steel pipes per lot (for steel pipes in grades 10, 20, Q345, with an outside diameter of not greater than 76mm, and a wall thickness of not greater than 8mm) |
Bending test |
One sample on each of the two steel pipes per lot (for steel pipes with an outside diameter not greater than 22mm) |
Hydrostatic test |
Each pipe, dwell time is not less than 5s, can be replaced by eddy current test |
Eddy current test |
Each pipe |
Magnetic flux leakage detection |
Each pipe, can be replaced by eddy current test |
Ultrasonic test |
Each pipe |
Dimension and shape |
It should be measured with a measuring tool that meets accuracy requirements |
Inner and outer surfaces |
It should be visually inspected under sufficient lighting conditions |
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Lot rule |
Each lot should be composed of steel pipes of the same grade, the same heat number, the same specification and the same heat treatment system (furnace). The quantity is as follows:
The outside diameter is not greater than 76mm, and the wall thickness is not greater than 3mm: 400 pieces;
Outside diameter is greater than 351mm: 50 pieces;
Other sizes: 200 pieces;
If the number of remaining steel pipes is not less than 50% of the above-mentioned rule, they should be listed as a separate lot. In case less than 50% of the above-mentioned rule, it can be merged into adjacent lot of the same grade, the same heat number, and the same specification.
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According to user requirements, steel pipes can be delivered by galvanizing. The galvanized layer on both inner and outer surfaces should be completed, and there should be no black spots and bubbles that are not plated with zinc, small rough surfaces and local zinc tumors are allowed. The surface of the steel pipe can be passivated after galvanizing. The inner and outer surfaces of the steel pipe galvanized layer should be visually inspected under sufficient lighting conditions. |
| Keyword: GB/T 8163, Seamless Steel Tube, Seamless Steel Pipe, Liquid Seamless Steel Pipe |
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