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2025-06-18

What are black square tubes mainly used for?

Black square tube is a commonly used steel pipe material, also known as black rectangular steel pipe or square welded pipe. Its cross-sectional shape is rectangular or square, with high strength and compressive resistance. Black square tube is mainly made by welding process, and common finished product sizes are 30*20mm, 40*20mm, 50*25mm, etc., which can also be customized according to customer needs.

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2025-06-18

How to Choose High-Quality ERW Pipes?

ERW pipes (Electric Resistance Welded pipes) are widely used across industries such as construction, oil and gas, water conservancy, and mechanical engineering. But with so many suppliers on the market, how can you ensure you're buying ERW pipes that truly meet your quality standards?The answer starts with this: choose the right manufacturer.A trustworthy ERW pipe manufacturer can make or break your project. High-quality materials, advanced production technology, and reliable after-sales service are all crucial. In this article, we’ll walk you through five essential factors to consider when choosing your ERW pipe supplier—whether you're building infrastructure or planning an energy project.

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2025-06-17

What is ASME B16.5?

ASME B16.5 is a standard recommended by the American Society of Mechanical Engineers. It is also a more authoritative and recommended standard, so it is widely used. It specifies in detail the dimensions, tolerances, markings, materials and other related requirements of pipe flanges and flanged fittings. The standard covers the use pressure, temperature and other parameters of ASTM standards. ASME B16.5 is an American standard for pipe flanges and flanged fittings, and is highly recognized worldwide.

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2025-06-17

What are the functions of cable casing pipes?

Cable casing, also known as protective tube or conduit, is a pipe used to protect wires and cables in electrical installations, allowing wires and cables to be inserted and replaced. Cable casing is a new type of casing material that is widely used in power engineering.

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2025-06-16

ASTM A105 Flange Standard Specification

ASTM A105 covers forged carbon steel flange and piping components for ambient and higher-temperature service in pressure systems. It also includes pipe fittings, valves and similar parts. The maximum weight manufactured forging part follows by this standard is 10000 bounds (4540kg). The larger forgings can according by the standard A 266/A266M. This specification do not covers tube sheets and hollow cylindrical forgings for pressure vessel shells .

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2025-06-13

Advantages of stainless steel pipe elbows

There is a product in stainless steel pipes that is used to meet various turning requirements of pipes - stainless steel pipe elbows. It is widely used. In actual use, people choose stainless steel pipe elbows according to the angles they need to turn. Generally, 45° and 90° are commonly used. So what are the advantages of stainless steel pipe elbows that are so widely used? Let's take a look with BAOWI STEEL stainless steel pipe manufacturers!

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2025-06-13

Materials and advantages of ASTM A182 butt welding flange

ASTM A182 butt welding flange is a flange pipe with a neck and a round steel pipe connection, which is connected to the pipe port by butt welding. It is a disc-shaped part, which is most common in pipeline engineering. Flanges are used in pairs. A sealing gasket is added between the two flanges and then fastened with bolts. Flanges of different pressures have different thicknesses and use different bolts. This flange has the characteristics of no variability, good sealing function, moderate rigidity and ductility.

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2025-06-12

Things to note when purchasing LSAW steel pipes

LSAW steel pipes are mainly used in the power industry, agricultural irrigation, water supply engineering, chemical industry, and urban construction. It is a steel pipe with a weld parallel to the longitudinal direction of the steel pipe. Its production technology is simple, the production efficiency is high, the application field is wide, the cost is low, and the development is relatively fast. So what should we pay attention to when purchasing LSAW steel pipes?

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2025-06-12

Understanding API 5CT K55 Pup Joints

In the petroleum and gas extraction industry, maintaining structural integrity and operational efficiency in downhole tubing and casing systems is essential. Among the various components in these systems, pup joints play a critical role. This article focuses on the K55 pup joint, a specialized short-length casing manufactured according to API 5CT specifications, particularly using Grade K55 steel.

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2025-06-11

What is ASTM A105 Flange?

ASTM A105 flange is a pipe fitting made from forged carbon steel. It is mainly used in piping systems operating under high pressure and at either ambient or elevated temperatures. This flange is widely used in industries such as oil and gas, power generation, petrochemicals, and steam systems.The ASTM A105 standard specifies the chemical composition, mechanical properties, and dimensional requirements of this product, ensuring its strength, ductility, and durability in demanding environments. While there are other flange standards like ASTM A350 for low-temperature use, ASTM A105 flanges are popular for their versatility and reliability.、

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2025-06-11

How to Clean and Maintain Stainless Steel Rectangular Tubes ?

The use of stainless steel rectangular tubes has become more widespread with the development of the economy. People are closely related to stainless steel rectangular tubes in their daily lives, but many people do not know much about the performance of stainless steel rectangular tubes, and know even less about the maintenance of stainless steel rectangular tubes. Many people think that stainless steel rectangular tubes will never rust. In fact, stainless steel rectangular tubes have good corrosion resistance. The reason is that a passivation film is formed on the surface, and it exists in the form of a more stable oxide in nature. In other words, although the degree of oxidation of stainless steel rectangular tubes varies according to different use conditions, they are eventually oxidized. This phenomenon is usually called corrosion.

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2025-06-10

What does DN and De mean in steel pipe?

People always have questions about the DN of steel pipe, so today we will take some time to understand DN.DN is a common term that indicates the nominal diameter of a pipe. DN stands for "Diamètre Nominal", which is a French term that means "nominal diameter". The nominal diameter is the size of the inside diameter of the pipe, generally expressed in millimeters.Steel pipes come in a variety of DN sizes, each with its own specific purpose. Typically, the DN size of steel pipes ranges from DN15 to DN1200. Here are some of the most common steel pipe DN sizes and their corresponding nominal diameters in millimeters: