Sch40 Hot Dip Galvanized Steel Pipes For Scaffolding
Short Description:
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 connec...
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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. |
Hot galvanized steel pipe production process
We have two kinds of packaging:
1. Packaging suitable for every kind of transport;
2. According to customer’s requirement to packaging;