About US
Zhejiang Guanyu Steel Tube Co., Ltd
Zhejiang Guanyu Steel Tube Co., Ltd has been serving the World since 2003. It has passed the China Special Equipment Manufacturing License TS-A and B, EU pressure equipment PED 2014/68/EU material certification, ISO9001 international quality management system certification, ISO14001 environmental management system certification, ISO 45001 occupational health and safety management system certification
Zhejiang Guanyu Steel Tube Co., Ltd is a specialized manufacturer of High Quality Stainless Steel Tubes & Pipe, Nickel Alloy Tubing & Pipe in China. Production area covers an area of 35,000 square meters. Annual output capacity more than 10,000 metric tons.
We have built a complete quality management system and organization according to ISO 9001:2015 and PED 2014/68/EU. Quality control begins with an audit trail and continues from the point of steel melting. for the raw materials, we select the best quality raw material for our customers. right through to the finished product. This level of attention to detail extends throughout the design and manufacturing chain, all kinds of inspection will be all through the producing process to ensure the Stainless Steel Pipe Tubing and Nickel Alloy Seamless Pipe, Copper Nickel Alloy Tubes, Brass Seamless Tubes are finished in qualification. With destructive and non-destructive tests according to standard specification and customer’s special requirement, and including verification of performance by independent third-party test houses.
Our Principles
Save every Cost for our customers!
Fully support our customers and grow with them!
Select the best quality raw materials for our customers and bring them longer-term profits！
Thanks to all of our clients, your trust drives us to overcome millions of difficulties and achieve today’s success!
Advantages of Guanyu Tube
- 1. Super high cost performance.
- 2. Stable and reliable quality.
- 3. Specializing in the production of stainless steel tubes for heat exchangers. Professional because of focus.
- 4. Can produce ultra-long stainless steel seamless tubes. Maximum Length is 60000mm.
- 5. Fast delivery time. We have 22 sets cold rolling mills and 5 sets cold drawing machines to ensure rapid completion of production and delivery.
- 6. Clean internal and external surfaces of stainless steel tubes.
- 7. Excellent straightness. For customers with special requirements, we will add a straightening step before shipping.
Environment and Safety
Guanyu Steel Tube is ISO 14001 and OHSAS18001 Certified. We systematically seek to reduce the environmental impact of our business as well as the safety risks that our employees are exposed to. In particular with relation to the new conception of plants and the improvement of processes, we drive forward this optimisation process in terms of environmental impact and health and safety.
Thanks to all of our clients, your trust drives us to overcome millions of difficulties and achieve today’s success!
Main Raw Material Supplier:
Yonxing Special Material / BAOSTEEL / POSCO / Sandvik / Outokumpu / Nippon Steel & Sumitomo Metal
Mainly Producing & Testing Equipment List
| Equipment Name | Detailed Description | Quantity (sets) |
| Cold Rolling Pilger Machine | LG15 LG-20-HS LG60-H | 22 |
| Cold Drawing Machine Set | OD 3 – 530mm | 6 |
| Solution Annealing Furnace | CNG Controled by Computer 25 Meters | 1 |
| Bright Annealing Furnace | Nitrogen and Hydrogen | 1 |
| Pickling Tank | 25 Meters 25000*1600*1000mm | 5 |
| Electric Resistance Heat Treatment | XL-21 | 1 |
| Straightening Machine | LJ25, LJ110, LJ160 | 10 |
| Eddy Current Test Machine | ECT-308E | 1 |
| Ultrasonic Test Machine | CTB-108 | 1 |
| Hydrostatic Test Machine | Maximum 25 Meters | 4 |
| Direct Reading Spectrometry | M5000F | 1 |
| Portable Spectrometer | Hitachi X-MET8000 Smart | 4 |
| Rockwell Hardness Tester | HR-150DT | 1 |
| Vickers Hardness Tester | 1 | |
| Universal Test Machine | WEW-600B 6-600KN | 1 |
| Metallurgical Microscope | 4XI-II | 1 |
| Endoscope Test | DEPSTECH | 2 |