Leading Welded Steel Pipe Manufacturer in China Since 1998


TUSPIPE is a China welded steel pipe manufacturer with a 500,000MT annual production capacity.

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Welcome to the splendid world of TUSPIPE, where Welded Steel Pipes are crafted to perfection. Stationed in Tianjin, China, we are an established name with three production lines dishing out 50,000 tons of steel pipes annually. Our reach? Global. Our pipes are adorning over 70 countries with their high-quality, versatility, and compliance to an array of international standards including API 5CT, API 5L, JIS G3444, JIS G3452, ASTM A53/A53M, ASTM A135, ASTM A252, ASTM A500, ASTM A795, AS/NZS 1163, AS/NZS 1074, AS/NZS 1396, EN 10217, EN 10219, EN 10255, UL 852, FM 1630 and more. Whether it’s oil and gas, construction, or solar energy, our pipes are the backbone of industries far and wide. TUSPIPE is more than a manufacturer; we are your partners in progress.

Large Inventory

TUSPIPE holds around 20,000MT of welded pipes and raw materials in stock, so we are able to make a fast delivery when you have an urgent request.

Professional Expertise

A team of 12 professional and experienced engineers working at TUSPIPE makes the production process more efficient and functional.

Rich Experience

Our factory was established in 1998, and we have accumulated rich experience in pipe production and engineering projects.

Easy to Communicate

You speak to the factory directly, so your question can be answered quickly with a more professional approach. Also, multilingual services are available.


Line Pipe
Sprinkler Pipe
Piling Pipe
Structural Pipe
Torque Tube
shouldered pipe
Shouldered Pipe
Pipe Fittings

Usage Scenarios



Fire Fighting

Fluid Transportation


Oil & Gas

Piling Jobs

Steel Fabrication

New Energy


High-Frequency Welding
Dual Heat Treatment
Air & Water Cooling
End Processing
Pipe Machining
Varnishing / Coating
Container Stuffing



Supplier Management

Tianjin United Steel Pipe Co., Ltd (TUSPIPE) carries out a strict audit on suppliers, checking their production qualification and capacity to ensure that the quality control procedures of raw materials meet the requirements. In addition, the company also evaluates the suppliers every year and evaluates the past quality control, document control, delivery time, and other information to ensure that the suppliers meet our product quality requirements.


Before Production

After receiving the hot-rolled coil of raw materials, the quality assurance department sends an inspector for visual inspection, to eliminate cracks, pits, and other defects on the surface of the coil to affect the subsequent production. In addition to visual inspection, the inspection personnel also takes samples from the coil plate for chemical composition analysis and mechanical experiment according to the standard requirements, and compare the inspection results with the data on the material quality certificate issued by the coil plate supplier. If the analysis results do not meet the requirements of the standard, the raw material will be returned to the supplier for replacement.

During Production

In order to ensure that our welded steel pipes meet the standard requirements, the quality engineers, on-site inspection personnel and front-line production workers need to make great efforts. In the production process, we will carry out the following inspection and test on the steel pipe according to the standard requirements:


Tensile Test

Tensile test is a type of mechanical testing that measures the force required to pull on a pipe. The results of the test are used to determine the yield strength and elongation. To perform a tensile test, a sample is placed in a testing machine and pulled until it breaks. The machine measures the amount of force required to break the sample, as well as the amount of elongation that occurred before the break. By analyzing these results, engineers can determine whether a material is suitable for its intended application.

Metallographic Test

Metallographic tests are one of the important means of experimental research on metal materials. It is used to check the metallographic structure of the weld and heat affected zone and determine the internal defects. Through the analysis of metallographic structure, we can know the number, grain size, and microstructure of various micro oxides in the weld metal, so as to study the reasons for the advantages and disadvantages of the welding process and develop the heat treatment process parameters.

Charpy Impact Test

Charpy impact test is used to measure the notch resistance sensitivity (toughness) of metal materials. It is generally a test method to determine the safety, reliability and effectiveness of the product when it is subjected to external impact or action. The main assessment and determination of the product in its life may be subjected to a variety of shocks to adapt to the ability, that is, can work normally in the impact environment and maintain the integrity of the structure.
chemical component analysis-spectrum analysis

Chemical Component Analysis

Since each atom has its own characteristic spectral line, the spectrum can be used to identify substances and determine their chemical composition. This method is called spectral analysis. For spectral analysis, the emission spectrum or absorption spectrum can be used. This method has the advantage of being very sensitive and fast. When the content of an element in a substance reaches 10^ -10grams, its characteristic line can be found in the spectrum, and it can be detected.

Drop-Weight Tear Test

The Drop-weight Tear Test (DWTT) is a test item used to test the toughness of materials. It is mainly used to study the brittleness of metal materials at low temperatures. The goal is to establish the relationship between fracture morphology and temperature. This experiment is to use a drop hammer or pendulum at a certain height to break the sample in the state of a simply supported beam and evaluate the relevant performance results (such as the shear area fraction on the fracture surface of the sample).

Flattening Test

The flattening test is a test method used to test the deformation performance of a metal tube flattened to a specified size and to show its defects. In the flattening test, the sample is placed between two parallel plates, and the press, or other method, applies uniform pressure to the flattened distance (with the outer wall of the tube flattening, expressed in mm). Check the sample's bending deformation. If there is no crack, weld cracking, that qualifies.

Hydrostatic Test

The hydrostatic test, also known as the hydro test, is a kind of test that can effectively test the tightness of steel pipes. This test is used to assess the structural integrity of pressure-containing pipelines and other infrastructure. During the test, the pipe is filled with water and the water pressure is increased, maintained for a predetermined amount of time, and then released. The test is conducted at higher pressures than the pipeline's typical operating conditions.

NDT Test

The non-destructive test, also known as the NDT test, refers to the detection of internal and surface defects of various engineering materials, parts, and structural parts by using changes in physical quantities such as heat, sound, light, electricity, and magnetism caused by internal structural abnormalities or defects in materials without damaging the object to be tested. Nondestructive testing is widely used in the detection of metal materials, such as pipes, plates, and coils.
Tensile Test
Metallographic Test
Charpy Impact Test
spectral analysis
Flattening Test
Hydro Test
NDT Test

Coating, Marking, and Packaging

After the welded steel pipe production is completed, Tianjin United Steel Pipe Co., Ltd (TUSPIPE) performs the surface coating of the steel pipe according to the customer’s requirements, to prevent corrosion. Standard coated with black paint, varnish, and anti-rust oil, these materials can play a temporary anti-rust effect in the process of transportation. If FBE, PE, or PP coatings are needed, the pipes will be transported and finished in a coating mill.
Tianjin United Steel Pipe Co., Ltd (TUSPIPE) sticks a bar code on the inner wall of each steel pipe, and the bar code is unique on the pipe end. The bar code is equivalent to the ID card of each unit under the steel pipe, which records the heat number, tube number, steel grade, and production information of each pipe. After finishing the coating process, the production workers scan the bar code to obtain the corresponding product information and mark pipes according to the standard and contract requirements to ensure the traceability of the product.
Generally speaking, the packaging of products plays a crucial role in protecting products during transportation, so the company is also very concerned about this process. According to the size, coating, and other processing information of steel pipe, the company usually uses end caps, PVC wrap, nylon sling, galvanized strip, fumigated wood, and other materials to protect the steel pipe. At the same time, the engineers can generate a customized packing scheme since some of our customers need more solid, stable, easy-to-unload packaging solutions.

Before Shipment

Before delivering to the customers, the inspector re-checks the appearance, packaging, marking label, tag, and other specifications of the steel pipe to ensure that the customer will not receive any defective products. After passing the inspection, the quality assurance department of Tianjin United Steel Pipe Co., Ltd (TUSPIPE) issues a mill test certificate according to each batch of shipped products.




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