China API 5L & API 5CT Certificated Carbon Steel Pipe Mill Since 1998
TUSPIPE is a steel pipe manufacturer who offers high-quality products and services to our clients since 1998.
Since 1998, Tianjin United Steel Pipe Co., Ltd (TUSPIPE) has been committed to supplying high-quality carbon steel pipes. Our customers like to work with us because of our professional ability and the large inventory that we offer.
The main products are API 5L Line Pipe, API 5CT Casing Pipe, and Tubing. And also, Tianjin United Steel Pipe Co., Ltd supplies slotted liner, compressor tubes, transmission shaft tubes, torque tubes, piling pipes, sprinkler pipes, boiler pipes, roller pipes, etc. Production standards include API SPEC 5CT, API SPEC 5L, JIS G 3444, JIS G 3452, 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, GB/T 9711, GB/T 3091, GB/T 13793, GB/T 19830, YB/T 5209, and SY/T 5768.
With over 500,000 tons annual production capacity, our company serves various fields and industries, such as oil & gas exploitation and transmission, ship & auto-building, water & electricity, environmental protection, mechanical engineering, infrastructure construction, etc.
The Reasons Why We Have Reliable Product Quality.
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.
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.
In order to ensure that our 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:
The tensile test generally refers to the elongation test, tensile test can determine a series of material strength indicators and plastic indicators. Strength usually refers to the ability of a material to resist elastic deformation, plastic deformation, and fracture under the action of external forces. Plasticity refers to the ability of metal materials to produce plastic deformation without damage under the action of load. The commonly used plasticity indexes are elongation and section shrinkage.
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
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).
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.
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.
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.
Coating, Marking, and Packaging
After the steel pipe production is completed, TUSPIPE performs the surface coating of the steel pipe according to the customer’s requirements, so as to prevent corrosion. Common 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.
TUSPIPE sticks a bar code on the inner wall of each steel pipe, and the bar code is unique on each pipe. 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 the protection of 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 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 issues a mill test certificate according to each batch of shipped products.
Australia Gas Pipeline Project
Venezuela PDVSA Piping Project
Myanmar MOGE Pipeline Project
Mexico PEMEX Petroleum Pipeline Project
We have rich experience in various fields, such as Oil & Gas, Construction, Solar, Fluid Transmission, Minning, etc. We hope these experiences will play a key role in our future collaboration and enable our projects to proceed smoothly.