erw steel pipe size chart
Production Standards

At TUSPIPE, we proudly follow global industry standards, including API, ASTM, EN, JIS, and more. We ensure that each pipe meets the highest quality standards to fulfill our customers’ needs for reliability and durability.

TUSPIPE Standards-erw pipe size & chart

TUSPIPE is known for its high-quality ERW steel pipes and tubes, which have not only earned the trust of our customers in the domestic market, but have also built an excellent reputation in the international market.(Each standard’s detail page has a standard chart/ pipe standard siza/ and pipe standard physical and chemical properties.)

OUR Certificates

As a pipe manufacturer, we follow strict standards in the production of steel pipes and since 1998, we have been awarded a number of standard certificates and I am proud to say that we are not only a pipe manufacturer, but also a standard producer.

API Certificate (American Petroleum Institute Certification): It ensures that the quality and performance of the product meets the requirements of the international petroleum industry standards.
ASTM Certificate (American Society for Testing and Materials Certification): The ASTM standard is one of the most commonly used international standards for materials and products.
JIS Certificate (Japan Industrial Standards Certification): It is issued by the Japan Industrial Standards Organization and is particularly important for products entering the Japanese market.
FM Certificate (Factory Mutual Insurance Association Certification): It ensures the safety of the product in case of fire and other risks.
UL Certificate (Underwriters Laboratories Certification): This certificate is one of the conditions for access to the North American market.
AS/NZS Certificate (Australian and New Zealand Standards Certification): It proves that the product meets the technical standards and regulatory requirements of Australia and New Zealand.

The acquisition of these certificates represents the international community’s recognition of our factory, making our products the best passport. It not only proves that we already have strict product control and testing, but also improves customers’ confidence in us. 

Below are the certificates of our factory, please appreciate it.

API 5L line steel pipe manufacture certificateAPI 5L line steel pipe manufacture certificate
Steel Pipe for sale - China black pipe ManufacturersSteel Pipe for sale - China black pipe Manufacturers
JIS G3452 steel pipe manufacture certificateJIS G3452 steel pipe manufacture certificate
Steel Pipe for sale - China black pipe ManufacturersSteel Pipe for sale - China black pipe Manufacturers
ISO 45001 black pipeISO 45001 black pipe
Steel Pipe for sale - China black pipe ManufacturersSteel Pipe for sale - China black pipe Manufacturers
UL 852 listed steel pipe manufacture certificateUL 852 listed steel pipe manufacture certificate
FM approval fire sprinkler steel pipe manufacture certificateFM approval fire sprinkler steel pipe manufacture certificate
Steel Pipe for sale - China black pipe ManufacturersSteel Pipe for sale - China black pipe Manufacturers
CNAS - Steel Pipe Laboratory accreditation certificateCNAS - Steel Pipe Laboratory accreditation certificate
Steel Pipe for sale - China black pipe ManufacturersSteel Pipe for sale - China black pipe Manufacturers
ISO9001 steel pipe manufacture management system certificateISO9001 steel pipe manufacture management system certificate
Steel Pipe for sale - China black pipe ManufacturersSteel Pipe for sale - China black pipe Manufacturers
EN10219 steel pipe manufacture certificateEN10219 steel pipe manufacture certificate
EN10217 steel pipe manufacture certificateEN10217 steel pipe manufacture certificate
EN 10217 steel pipe manufacture certificateEN 10217 steel pipe manufacture certificate
BC1 steel pipe manufacture management system certificateBC1 steel pipe manufacture management system certificate

TUSPIPE Laboratory

TUSPIPE’s Test & Inspection Center symbolizes our relentless dedication to delivering ERW steel pipe that meet the highest standards and supports authoritative testing and inspection practices.

erw steel pipe
  • TUSPIPE has established a testing and inspection center since 2004.
  • It can perform a series of advanced tests such as tensile test, hydraulic test, impact test, DWTT and so on.
  • The laboratory has been evaluated by China National Committee for Conformity Assessment (CNCA) and has successfully obtained CNAS laboratory accreditation.
  • The test results of the laboratory are recognized by 35 management system certification bodies and other 54 national laboratory accreditation bodies.
  • The company has successively obtained the qualifications and honors of “Enterprise Technology Center” and “Key Laboratory of ERW Steel Pipe”, and is also part of the “Key Technology R&D Center” cultivated by Tianjin Municipality.

tuspipe QUALITY CONTROL Procedure


Tensile Test

A tensile test is a type of mechanical testing that measures the force required to pull on a erw steel 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 (or stretching) 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 erw steel pipes. This test is used to assess the structural integrity of pressure-containing pipelines and other infrastructure. During the test, the erw steel 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 erw steeel pipes, plates, and coils.
Tensile Test
Metallographic Test
Charpy Impact Test
spectral analysis
Flattening Test
Hydro Test
NDT Test


TUSPIPE now has a number of modern production lines, including advanced automated steel pipe welding line and heat treatment line, with about 20,000 tons of ERW steel pipe and raw material inventory, annual production capacity of 500,000 tons. 

Quality is the lifeblood of TUSPIPE. The company has passed the ISO 9001 quality management system certification, in strict accordance with national and international standards for production and testing. 

From uncoiling, forming, high frequency welding, double heat treatment, air and air water cooling, sizing, end treatment, pipe processing, varnish/coating, packaging to container filling, each process is subject to strict quality control to ensure that every steel pipe is of the highest quality.

Our commitment to ERW Steel Pipe quality extends beyond the manufacturing process to every aspect of our operations, and TUSPIPE’s Test & Inspection Center symbolizes our dedication to delivering erw steel pipe that meet the highest standards and support authoritative testing and inspection practices.

erw pipe Uncoiler
erw pipe Accumulating
ERW PIPE-forming
High-Frequency Welding
Dual Heat Treatment
Air &Amp; Water Cooling
End Processing
Pipe Machining
Varnishing / Coating
Container Stuffing
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