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It's mainly used as the prestressed concrete structure, such as the large span railway and highway, bridge, crane girders, rock-soil anchoring engineering, multi-floor industrial plant, coal, sports venues, etc.
1. Type: Round and Flat metal ducts;
2. Color: black and galvanized;
3. Thickness: 0.25-0.6mm
4. Dia.: 35mm-130mm;
5. Length:5.8meters,11.6meters or costomized.
Product Show:

The parameters of the galvanized round duct:
| Bore | 40 45 50 55 60 65 70 75 80 85 90 98 100 110 120 125 130 135 140 150 155 160mm |
| Allow Diameter | 40mm-100mm is ±0.5mm Tolerance. 110mm-160mm is ±1.0mm Tolerance. |
| Standard with a thickness of just | 0.25mm to 0.30mm |
| Enhanced Strip Thickness | 0.40mm to 0.50mm |
The export packing manners are as follow:
1. Loose package by nylon rope
2. Carton
3. Wooden pallet
4.Iron frame
5. As per client requirement
packing:


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Tianjin Zhongmao Group.
Tianjin Zhongmao Group is a Manufacture of Prestressed Products, Including Corrugated Duct(HDPE duct and Galvanized duct), Anchorage and Unbonded/PE Strand.

why choose us?
1.Our company is located in the beautiful coastal city Tianjin which is near to the Tianjin Xingang Port.
2.We are the professional manufacturer of the galvanized and HDPE duct, anchor and unbonded steel strand.And we could supply one-to-one solution to our clients.
3.Modern and professional machines to match the production line.
4.Our products have been sold domestic and all over the world.
5.Free samples and free freight charge if the samples are not too heavy.


1.10 years' experience in manufacturing prestressed products
2.Top 3 manufacturer of corrugated duct in China
3.Strict quality control system
4.Free samples and free freight charge if the samples are not too heavy
5.Customized products are available
6.Professional consultation and service


1.Do you have factory?
We have many factories under the zhongma group, including producing anchorage, pc strand, corrugated duct and so on
2.Can you send us the sample?
Yes, we can offer samples for free, but the express cost would be on buyer’s account.
3.How about the delivery time?
Within days after we confirm you requirement .
4.What kind of payment does your company support?
We accept T/T,L/C,D/P and D/A.For T/T Payment, we can accpet 30%prepayment in advance and the balance payable against the copy of B/L.
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