Tianjin Tianyingtai Steel Pipe Co., Ltd. is one of the most credible manufacturers and suppliers of GI Hollow Tube Pre-Galvanized Steel Pipe for Construction & Industrial Use in China. Welcome to consult the quotation and import cheap GI Hollow Tube Pre-Galvanized Steel Pipe for Construction & Industrial Use made in China here from our factory.
Gi hollow tube Product Description
|
Gi square hollow tube(Zinc coat:30-270g/m2) |
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| Standard | Side Length(mm) | Common Tube(mm) | ||||
|
Q195 Q215 Q235 |
DN | Side Length Tolerance |
Thickness | Length | Length Tolerance |
|
| 16 | 16 | ±0.5 | 0.7-2.2 | 3000-12000 | +20, -0 | |
| 19 | 19 | ±0.5 | 0.7-2.2 | 3000-12000 | +20, -0 | |
| 20 | 20 | ±0.5 | 0.7-2.2 | 3000-12000 | +20, -0 | |
| 20 | 40 | ±0.5 | 0.7-2.2 | 3000-12000 | +20, -0 | |
| 25 | 25 | ±0.5 | 0.7-2.2 | 3000-12000 | +20, -0 | |
| 25 | 50 | ±0.5 | 0.7-2.2 | 3000-12000 | +20, -0 | |
| 25 | 75 | ±0.5 | 0.7-2.2 | 3000-12000 | +20, -0 | |
| 30 | 30 | ±0.5 | 0.7-2.2 | 3000-12000 | +20, -0 | |
| 30 | 40 | ±0.5 | 0.7-2.2 | 3000-12000 | +20, -0 | |
| 30 | 50 | +0.4, -0.5 | 0.7-2.2 | 3000-12000 | +20, -0 | |
| 32 | 32 | ±0.5 | 0.7-2.2 | 3000-12000 | +20, -0 | |
| 35 | 35 | ±0.5 | 0.7-2.2 | 3000-12000 | +20, -0 | |
| 37 | 57 | +0.4, -0.5 | 0.8-2.3 | 3000-12000 | +20, -0 | |
| 37 | 77 | ±0.5 | 0.8-2.3 | 3000-12000 | +20, -0 | |
| 38 | 38 | +0.4, -0.5 | 0.8-2.3 | 3000-12000 | +20, -0 | |
| 38 | 75 | +0.5, -0.6 | 1.0-2.3 | 3000-12000 | +20, -0 | |
| 50 | 75 | +0.5, -0.6 | 1.0-2.3 | 3000-12000 | +20, -0 | |
| 40 | 40 | +0.4, -0.5 | 0.8-2.3 | 3000-12000 | +20, -0 | |
| 40 | 60 | ±0.5 | 0.8-2.3 | 3000-12000 | +20, -0 | |
| 50 | 50 | ±0.5 | 1.0-2.3 | 3000-12000 | +20, -0 | |
| 40 | 80 | +0.5, -0.6 | 1.0-2.3 | 3000-12000 | +20, -0 | |
| 50 | 75 | +0.5, -0.6 | 1.0-2.3 | 3000-12000 | +20, -0 | |
| 60 | 60 | +0.5, -0.6 | 1.0-2.3 | 3000-12000 | +20, -0 | |
| 50 | 100 | ±0.7 | 1.0-2.3 | 3000-12000 | +20, -0 | |
| 50 | 150 | ±0.8 | 1.0-2.3 | 3000-12000 | +20, -0 | |


Material/characteristic:
1.Tianyingtai is committed to long-term development, creating high-quality products and services, with the same pursuit of quality and service, stable, strong, long-term cooperation raw material suppliers, such as Haigang, Yurunde, etc., to maximize the consistency and stability of materials, product appearance and internal quality;
2.Raw materials grade : Q195, 235, 235B and Q345...
3.The zinc coating can customized for customers, up to 280 grams.
4.The purity of zinc wire is 99.99% zinc content with high purity.to remain the pipe welded seam antirust.
5.The diameter of zinc wire is 1.5mm which has great protection for welding.
6.The salt spray test can satisfy at least 8 hours without corrosion.
7.In the passivation process, we have own invention patents - galvanized pipe passivation liquid automatic spraying system to ensure even adhesion, high passivation efficiency, beautiful appearance.
8.In November 2014, it was recognized as "Tianjin Famous Trademark" by Tianjin Market and Quality Supervision Committee. The steel pipe produced and sold by the company was rated as "Tianjin Famous Brand Product" by Tianjin Municipal Government. and keep for many years.
Production processes:


Tianjin TianYingTai(TYT) Steel Pipe Co., Ltd is located in Jinghai, Tianjin, which is professionally engaged in steel production sales, steel processing, greenhouse engineering with accessories and export business. It has been experienced for 20 years so far. We have 13 production lines for various kinds of steel pipe, 10 processing production lines and 2 environmental production hot-dipped galvanizing lines. We not only can produce 450,000 tons of various sizes of ERW steel pipe, but also can produce deep processing pipe with 100,000 tons. Our annual production capacity of hot dipped galvanized steel pipe is 200,000 tons, capacity of greenhouse engineering material is 250,000 tons and highway column and guardrail is 200,000 tons.

Tianjin TianYingTai Imports & Exports Trade Co., LTD is our export company. We have achieved trading capacity 60,000 tons in 2016. Our products are widely used in agriculture, animal husbandry , chemical industry, machinery, construction, utilities, vehicle and other fields. Our customers are from Asia, the Middle East, the Southeast Asia, European Union and other countries.


Quality Inspection:
1.Our factory has its own "experimental testing center".CNAS Laboratory Accreditation Certificate (the second private enterprise to obtain this certificate)
2.Control quality strictly.The first pass is the quality inspection on the production line,The second pass is full inspection of the production quality .
3.We have got internationally recognized certificates, ISO, CE, LR,Philippine certificate,also support third-party testing,as SGS, BV, ect.

Packing&Shipment:
1.we have fully enclosed, clean and tidy modern logistics storage center with a building area of 20,000 square meters. It can provide customers with storage, package, billing and delivery. We can loading 20-25 containers one day. The packing accuracy rate is 100%;
2.We own professional logistics shipment, around more than 10 13-meter semi-trailers, in terms of transport efficiency and quality to provide customers with convenience, cost reduction, value-added services;
3.In the aspects of preventing steel pipe bumping, scratching, cratering, flattening, pipe deformation, raining, etc., standardization operations have been established and strictly implemented to ensure that the quality of the process of storage and transportation of steel pipes is effectively controlled

FAQ 1:What is the difference between pre-galvanized and hot-dip galvanized GI hollow tubes?
A: Pre-galvanized tubes are coated with zinc at the steel mill before fabrication, resulting in a thinner, more uniform zinc layer (typically 20–60 g/m²). Hot-dip galvanized tubes are immersed in molten zinc after manufacturing, producing a thicker, more durable coating (60–275 g/m²) that offers superior corrosion resistance - ideal for outdoor or harsh environments.
FAQ 2:What standards do your GI hollow tubes comply with?
A: Our products comply with major international standards, including:
ASTM A53 (USA) - General purpose steel pipe
BS 1387 (UK) - Steel tubes for screwed joints
GB/T 3091 (China) - Welded steel pipe for low-pressure fluid delivery
JIS G3444 (Japan) - Carbon steel tubes for general structural purposes We can also produce according to your specific standard requirements.
FAQ 3:What is the Minimum Order Quantity (MOQ) and lead time?
A: Our standard MOQ is 5 tons, but we can accept smaller trial orders for new customers. Lead time depends on the order quantity and specifications, ranging from 7 to 25 working days after deposit confirmation.
FAQ 4:How do you ensure product quality before shipment?
A: Quality is our top priority. Every batch undergoes:
Raw material inspection - chemical composition & mechanical properties testing
In-process inspection - dimension, wall thickness, and weld seam checks
Final inspection - zinc coating thickness, surface finish, and hydrostatic pressure test
Third-party inspection - SGS, BV, or other agencies available upon request
We also welcome you to arrange onsite inspection before shipment.
Contact our team today for a free quote⬇️
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