Sch40 Hot Dip Galvanized Steel Pipes For Scaffolding
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Technical data
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1. Hot galvanized steel pipe specification
1) Standard: GB/T3091-2001, A53, EN10255, DIN2440, BS1387 etc.;
2) Materials: Q235, Q345B, Gr.B, S195T, ST35 etc.;
3) OD: 13.7 mm-323.9 mm;
4) WT: 1.0mm-12mm;
5) Length: 2m-12m;
6) Application: construction, machinery, coal, chemical, railway vehicles, the automotive industry, road, bridges, containers, sports facilities, agricultural machinery, oil machinery, mining machinery and other manufacturing industries;
2. Galvanized steel pipe connection
Hot dip galvanized into and cold plating, redu easy to rust, cold plating on rust easily.
Galvanized steel connection: thread, weld;
1. Hot galvanized steel pipe specification
2. Pipe geometric tolerance
| Standard code content items | SY/T5037 -2000 | T9711 -1997 （A class pipe） | API 5L（43 version） | ||
| Applications | Gas, water, kerosene, air, heating, steam and other general fluid pipes with steel pipes | Oil and gas industry transmission pipe | Oil and gas industry transmission pipe | ||
| Steel | Q195、Q215、Q235 | L175 -L483 | A、B、X42 ~ X70 | ||
| Size | body OD | D<508 ±0.75%D D≥508 ±1.00%D |
D<508 ±0.75%D D≥508 ±1.00%D |
D<508 ±0.75%D 508≤D≤914 -0.25%D ~ +0.75%D D＞914 -0.32%D ~ +6.35%D |
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| end OD | D<508 ±0.75%D or ±2.5 be minimum D≥508 ±0.50%D or ±45 be minimum |
D≤273.1 -0.40 ~ +1.59 D＞323.9 -0.79 ~ +2.38 |
D≤273.1 -0.40 ~ +1.59 D＞323.9 -0.79 ~ +2.38 |
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| Tolerance | W.T. | ＜508 | ±12.5%t | -12.5%t ~ +12.5%t | -12.5%t ~ +12.5%t |
| ≥508 | ±10.0%t | L175 ~ L245 -10.0%t ~ +17.15%t L290 ~ L555 -8.0%t ~ +19.5%t |
Not beyond B class -12.5%t ~ +17.5%t Not lower than X42 -8.0%t ~ +19.5%t |
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| Oval tube | Inner tube end range 100 ±1%D | D＞508 steel in the range from 101.6 max OD of the pipe end can not be larger than the DN of 1%D; smallest OD than the DN shall be 1% D | D＞508 steel in the range from 101.6 max OD of the pipe end can not be larger than the DN of 1%D; smallest OD than the DN shall be 1% D | ||
| Curvature degree（straightness） | Not exceed 0.2% of the pipe length | Not exceed 0.2% of the pipe length | Not exceed 0.2% of the pipe length | ||
| Pipe end beveling | Bevel degree 30° -35° blunt edge1.6±0.8 | Bevel degree 30° -35° blunt edge 1.59±0.79 | Bevel degree 30° -35° blunt edge 1.59±0.79 | ||
| Tilt | 1.6≤D＜813 | ＜1.59 | ＜1.59 | ||
| Misalignment | t≤12.7 | 0.35t and not more than 3.0 | ＜1.59 | ＜1.59 | |
| t＞12.7 | 0.25t | 0.1251 and 3.18 take the minimum value | 0.1251 and 3.18 take the minimum value | ||
| Weld reinforcement | t≤13…＜3.2 t＞13 ＜4.8 |
t≤12.7…＜3.18 t＞12.7 ＜4.76 |
t≤12.7…＜3.18 t＞12.7 ＜4.76 |
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| Chemical analysis | Take one sample from each batch | Take two samples from each batch | Take two samples from each batch | ||
| Tensile test | Take one welded joint sample from each batch | Base matel: take one sample from each smelting batch Spiral weld：take one sample from each smelting batch butt weld: not more than 50 to take one sample |
Base matel: take one sample from each smelting batch Spiral weld：take one sample from each smelting batch butt weld: not more than 50 to take one sample |
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| Guided bend test | No | Each batch take a positive test sample and an anti-bend bend sample, butt weld no more than 50 to take a positive bend and an anti-bend sample. |
Each batch take a positive test sample and an anti-bend bend sample, butt weld no more than 50 to take a positive bend and an anti-bend sample. |
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| Fracture toughness testing | No | When the contract requirements,smelting complex batch takes three samples; D≥508, the drop hammer impact each smelting batch take two. |
When the contract requirements,smelting complex batch takes three samples; D≥508, the drop hammer impact each smelting batch take two. |
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Hot galvanized steel pipe production process
