Company News

2025-07-13

What are the standards for flanges?

Speaking of flanges, in addition to connecting or sealing pipes, when using pumps, flanges are also mainly used for connection. After understanding the basic types, sealing surface forms and applications of flanges, we also need to pay attention to the specification and standard classification of flanges, their ability to withstand pressure, flange disk thickness, applicable countries and so on.

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2025-07-11

Rust removal method for large diameter LSAW steel pipe

Large-diameter LSAW steel pipes refer to straight seam welded steel pipes with an outer diameter of more than 325mm. The diameter of the steel pipes produced by the double-sided submerged arc welding process can reach 2020mm, and the maximum diameter of a single weld can reach 1220mm. This type of steel pipe is usually made of high-quality steel such as Q345B and Q345C. In low-temperature areas, materials such as Q345D and Q345E are used. The production process includes hot rolling, hot coiling, casting and other methods. The specific procedures include bending, seaming, internal welding, external welding, straightening, flattening and other processes to ensure that the product meets the requirements of petrochemical standards.

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2025-07-10

How to Test the Corrosion Resistance of a Flange?

The use of flanges in industrial structural parts is mainly to improve the connection function and keep the pipeline sealed without leakage. However, many flanges will corrode and age after a period of use, thus losing their sealing function. Therefore, it is necessary to conduct corrosion tests on flanges regularly. Here I will share with you the process of measuring flange corrosion.

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2025-07-10

ASTM A500 Black Steel Pipe Quality Testing Explained

Black steel pipes are widely used in construction, machinery and various engineering projects. They are important materials for supporting structures and ensuring operation. Their strength and durability are directly related to the safety and effectiveness of the project. But before they are put into use, how do we know whether they are reliable?

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2025-07-09

Choosing the Right Welded Steel Tube Connection Type

Welded steel tubes are essential in construction, infrastructure, and industrial applications. These tubes are made by rolling steel plates and welding them to create a strong, sealed pipe. Their low cost, high strength, and pressure resistance make them ideal for demanding systems. The way these tubes are connected plays a vital role in safety, durability, and ease of maintenance.

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2025-07-09

ASTM A214 ERW Carbon Steel Pipe Specification

The ASTM A214 standard is a technical specification developed by the American Society for Testing and Materials specifically for electric resistance welded carbon steel heat exchanger and condenser tubes. Since its first release in 1939, it has undergone many revisions and has become a widely recognized industry standard worldwide. The ERW (Electric Resistance Welding) carbon steel pipes covered by this standard are mainly used in heat exchange equipment. Its core value lies in balancing material performance and production costs while meeting technical requirements under harsh working conditions. Unlike seamless steel pipes or other welded pipes, ASTM A214 ERW carbon steel pipes achieve a high degree of consistency between weld quality and pipe body performance through precise resistance welding technology and strict heat treatment control, and show excellent cost-effectiveness under medium temperature and pressure environments.

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2025-07-08

What is galvanized square hollow section?

Galvanized Square Hollow Section is a galvanized square hollow steel, which plays an important role in modern architecture, engineering construction and manufacturing. This material has both structural strength and corrosion resistance. It forms a protective layer on the surface of the steel through hot-dip galvanizing or electro-galvanizing process, which significantly extends the service life. Its basic structural feature is an equilateral square cross-section with a hollow center. This structure ensures strength while achieving lightweight materials.

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2025-07-08

Uses and Processing of High Pressure Boiler Tubes

High-pressure boiler tube is a kind of boiler tube, belonging to the category of seamless steel tube. The manufacturing method is the same as that of seamless tube, but there are strict requirements on the steel type used to manufacture steel tube. High-pressure boiler tube is often in high temperature and high pressure conditions when used. Under the action of high-temperature flue gas and water vapor, the tube will oxidize and corrode. The steel tube is required to have high lasting strength, high anti-oxidation and corrosion performance, and good organizational stability. High-pressure boiler tube is mainly used to manufacture superheater tubes, reheater tubes, gas guide tubes, main steam tubes, etc. of high-pressure and ultra-high-pressure boilers.

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2025-07-07

What are the reasons for carbon steel pipe rust?

Carbon steel pipes are one of the most widely used basic materials in industrial production and construction. Their biggest challenge is that they are prone to rust and corrosion. According to statistics, the economic losses caused by metal corrosion in the world each year account for about 3-4% of the GDP of each country, of which carbon steel corrosion accounts for a considerable proportion. Rusting of steel pipes not only affects the appearance, but also reduces the structural strength, shortens the service life, and even causes safety accidents.

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2025-07-07

What are the standards for different types of steel pipes?

The global steel pipe standard system presents a diversified pattern. The standards of different countries and regions have their own characteristics in terms of technical routes, performance indicators and emphasis. American standards (ASTM/API), European standards (EN) and Chinese national standards (GB) constitute the three most influential steel pipe standard systems in the world today. The three have differences in technical requirements and application scopes, but also learn from each other, and jointly promote the development and progress of global steel pipe technology. The following table introduces the standards of different types of steel pipes for reference only.

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2025-07-04

Application of carbon steel flange

Carbon steel flange is a flange or end flange connector whose main body is made of carbon steel. Flanges containing carbon steel are called carbon steel flanges. Common materials are cast carbon steel grades WCB, forgings A105, or Q235B, A3, 10#, #20 steel, 16 manganese, 45# steel, Q345B, etc. Usually, to prevent rust, the flange surface is electroplated (yellow zinc, white zinc, etc.), or anti-rust oil is brushed and anti-rust paint is sprayed.

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2025-07-04

High pressure boiler seamless tube

High-pressure boiler tube is a seamless steel tube, mainly used to manufacture steam boiler pipes with high pressure and above, such as superheater tubes, reheater tubes, main steam pipes and other key components. Its specifications range from 8-1240×1-200mm, following the Chinese national standards GB3087-2008, GB5310-2008, as well as international standards such as ASME SA210, SA213 and German DIN17175.