Tianjin Tianyingtai Steel Pipe Co., Ltd. is one of the most credible manufacturers and suppliers of Hot Dipped Galvanized Steel Pipe Manufacturer China TYT STEEl PIPE in China. Welcome to consult the quotation and import cheap Hot Dipped Galvanized Steel Pipe Manufacturer China TYT STEEl PIPE made in China here from our factory.
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This is the pipe that goes up before anything else does. Scaffold frames, greenhouse hoops, guardrails, fire mains, handrails, solar mounts, modular building frames - the galvanized tube that holds a construction site together while the permanent structure is still a drawing.
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We make it in one plant: steel strip is slit, formed, welded, sized, then dipped in molten zinc at 450°C. No intermediate trader, no re-bundling at a third-party warehouse, no gap between the mill certificate and the pipe you receive. -
Sizes run from 1/2" to 8" (DN15 to DN200), with wall thickness from 1.8 mm to 12 mm. Standard lengths are 5.8 m and 6 m; 12 m and cut-to-length available on request. Ends can be plain, threaded to BSP or NPT, grooved for mechanical couplings, or bevelled for welding.
The numbers that matter most to a buyer are on the specification table below, in the units your engineer and your customs broker both need.
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Specification
Item
Range / Standard
Standard
ASTM A53 / A53M, EN 10255 (formerly BS 1387), ISO 65, GB/T 3091, JIS G3444 on request
Outer diameter
21.3 mm – 219.1 mm (1/2" – 8"), up to 323.9 mm by arrangement
Wall thickness
1.8 mm – 12.0 mm; SCH10 / SCH40 / SCH80, or BS 1387 light / medium / heavy
Length
5.8 m, 6.0 m standard; 12 m and cut-to-length on request
Length tolerance
0 / +20 mm
Zinc coating
200 – 500 g/m² (≈28 – 70 µm), or per ASTM A53 minimum 245 g/m²
Coating process
Hot dipped after welding, full immersion - internal and external surfaces coated
Surface treatment
Chromate or chromate-free passivation; oiled on request
End finish
Plain, threaded (BSP / NPT) with couplings and caps, grooved, bevelled
Steel grade
Q235B, Q345B, S235JR, S275JR, Gr.A / Gr.B
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Weight and container loading, common sizes (SCH40, 6 m lengths):
Size
OD (mm)
Wall (mm)
kg/m
m per 40HQ (≈26 t)
1/2"
21.3
2.77
1.27
~20,400
3/4"
26.7
2.87
1.69
~15,300
1"
33.4
3.38
2.50
~10,400
1-1/4"
42.2
3.56
3.39
~7,600
1-1/2"
48.3
3.68
4.05
~6,400
2"
60.3
3.91
5.44
~4,750
3"
88.9
5.49
11.29
~2,300
4"
114.3
6.02
16.07
~1,600
6"
168.3
7.11
28.26
~900
8"
219.1
8.18
42.55
~610
Payload limited by weight rather than volume up to 8". Mixed-size containers possible from 5 t per size. Figures are indicative - confirm against your final wall thickness and port weight limits.
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Why hot dipped, not pre-galvanized
Pre-galvanized tube is made from coated coil, so the weld seam burns the zinc off after the fact and cut ends stay bare. Hot dipping happens after the pipe is welded and cut: the seam, the ends and the bore all get zinc.
That difference shows up in year three on a coastal site, not on the quotation. If your pipe is going outdoors, into a wet service, or anywhere a client will inspect it in five years, hot dipped is the specification you want. Our technical note on zinc coating thickness and standards covers the numbers in detail if you need to defend the choice to a project engineer.
Applications
Scaffolding and shoring - EN 10255 medium and heavy classes, 48.3 mm standard
Greenhouse and agricultural frames - light-wall tube, 1/2" to 2"
Guardrail, fencing and handrail - 1-1/2" to 4", plain or grooved ends
Fire mains and low-pressure water lines - GB/T 3091, internally coated option
Structural and modular building frames - square and rectangular hollow sections available
Solar mounting and cable trays - 1" to 2", cut-to-length
HVAC supports, duct framing, site hoardin
TYT STeel Main markets: Middle East, Southeast Asia, Africa, South America, Eastern Europe
FAQ
(1)What sizes can you supply?
1/2" to 8" (21.3 mm to 219.1 mm) as standard, with larger diameters up to 323.9 mm by arrangement. Wall thickness from 1.8 mm to 12 mm, including SCH40 and SCH80, or BS 1387 light, medium and heavy classes.
(2)What zinc coating thickness do you offer?
200 to 500 g/m², which is roughly 28 to 70 µm. For construction work outdoors, 300 g/m² and above is the usual specification. Coating mass is verified by gravimetric test per ASTM A90 on three samples per lot, and reported on the mill certificate.
(3)Can you supply to ASTM A53 and EN 10255 on the same order?
Yes, but as separate lots with separate certificates. The two standards have different coating minimums and dimensional tolerances, so mixing them in one bundle creates a documentation problem at destination that costs more than it saves.
(4)Do you supply threaded pipe with couplings?
Yes. BSP and NPT threads, cut before galvanizing so the thread itself is coated, with galvanized malleable iron or steel couplings and plastic caps fitted. Threads cut after dipping are available but we do not recommend them for wet service.
(5)What is your minimum order?
5 tonnes per size from stock, and 25 tonnes - one 40HQ - for a production run. Mixed-size containers are common; the limit is usually the 26-tonne payload, not the volume.
Send us the specification.
Tell us the size, the wall, the standard and the coating mass you need. If you only have a photo of the pipe you bought last time, send that - we read those for a living. You will have a technical confirmation and a costed quotation with the exclusions spelled out within one working day.
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