Heat treatment for hydraulic cylinder tubes

Hydraulic cylinder tubes are an essential component of hydraulic cylinders. They are used as hydraulic cylinder barrel to create linear motion through the conversion of fluid pressure into mechanical force. The manufacturing process of hydraulic cylinder tube involves several steps, including heat treatment. Heat treatment is a crucial process in the production of hydraulic cylinder … Read more

All Information about SAE flange/ Code 62 code 61 flanges

All product information about SAE flanges / code 61&code62 Flanges E-mail: [email protected] Tel: +86-1861-2706-695 Brief Introduction: What is a SAE flange?   We are China Manufacturer of SAE Flanges, Code 61/62 flanges, SAE 3000 psi /6000psi Flanges. Younglee is a leading manufacturer and supplier of various SAE flanges (code 61/code 62 flanges), we have rich experiences … Read more

What are the Pressure Ratings for different SAE Flanges?

SAE Flanges are usually forged flanges designed to standard SAE J518C and ISO 6162. They are mostly used in hydraulic systems and high pressure applications. So what are the working pressures for different sizes of SAE hydraulic flanges? There are two different series divided by the pressure ratings, which are: Pressure 3000 psi series SAE … Read more

How to choose, process and install hydraulic tubes properly?

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Hydraulic tubing manufacturer

How to choose, process, and install hydraulic tubes properly, in order to make the hydraulic line system work more energy-efficient, reliable, and have a longer life? This has become an important issue for hydraulic technologies. As one of the leading China hydraulic tube manufacturer and supplier, our company Younglee Metal specializes in manufacturing stainless steel hydraulic tubing and carbon steel hydraulic tubing for many years, and has many years experience of hydraulic tube related technology and research, we solved the hydraulic tube related technical issues for many customers, and provided production and technical services to them.

This article will briefly describe the hydraulic pipe selection, processing, installation, etc., with hope to help the customers in the hydraulic system industry who are in need.

Choose the right material and size of hydraulic tubes

The hydraulic tubes should be selected according to the system pressure, flow and application environment. Must pay attention to the strength of the tubing whether is enough, whether the pipe diameter and the wall thickness meet the system requirements, and the inner wall of the selected steel pipe must be smooth, non-corrosive, non-oxidized skin, no clips and other defects. If any of the following problems is found on the hydraulic tube, it cannot be used:

  1. the inner and outer walls of the hydraulic pipe have been heavily rusted;
  2. the scratch depth of the pipe body is more than 10% of the wall thickness;
  3. the surface of the pipe body is recessed to more than 20% of the pipe diameter;
  4. the wall thickness of the pipe section is uneven and the ellipticity is obvious.

In applications of medium and high pressure hydraulic systems, the seamless steel tubes are generally used, because they have the advantages as high strength, low price, and easy leak-free connection, it is widely used in hydraulic systems.


Stainless steel hydraulic tubes and hydraulic pipes

Ordinary hydraulic systems often use cold drawn low carbon steel tubes, because carbon steel hydraulic tubing can be reliably welded to various standard pipe fittings. And for applications where there is corrosion resistance is required, such as Hydraulic servo system, often use ordinary stainless steel seamless pipe, stainless hydraulic tubes are with corrosion resistance, smooth inner and outer surfaces, accurate size.

Regarding how to choose the right outside diameter and the wall thickness of the hydraulic tubes, we will talk in another blog article later.

Hydraulic Tubes processing, like Cutting, bending, welding


The processing of pipes mainly includes cutting, bending, welding and so on. The quality of the pipe processing has a great influence on the parameters of the pipeline system, and it is related to the reliable operation of the hydraulic system. Therefore, scientific and reasonable processing methods must be used to ensure the quality of processing.

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What is hydraulic ball valve?

Hydraulic ball valves are usually a kind of special stainless steel ball valves or carbon steel ball valves which are used in hydraulic industry, to control the fluid in the hydraulic systems.

Ball-valves, hydraulic-ball-valve, instrument-ball-valves-Younglee

As hydraulic ball valve is one sub category of the ball valves, so to explain what is hydraulic ball valve, we need to explain what is ball valve first.

What is ball valve?

Ball valves, as its name suggests, are stop valves that use a ball to stop or begin a stream of fluid. The ball (see in the below drawing) performs the exact same function as the disc in other types of valves. Since the valve handle is turned to open the valve, then the ball rotates into some stage where a part or all the hole through the ball is in line with the valve body enter port and export, permitting fluid to flow through the valve. After the ball has been rotated so the hole is perpendicular to the flow openings of the valve body, the flow of fluid ceases.

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What is Butt Weld Flange and its applications?

Butt weld flanges are widely used in different industries, this is one of the popular type of industrial flanges. Younglee is a leading manufacturer of various flanges including butt weld flange. Here this article is the most detailed introduction about butt weld flanges. The range of butt weld flange use is determined according to different … Read more

What is the reason of flange seal failure? How to prevent flange leakage?

Analysis of leakage of flange seal  and its Prevention 

Abstract: By analyzing the causes of leakage of flange seal, find out the prevention and solution.

Key words: flange  seal  leakage

Flange connection is widely used in the pipeline connection, such as  in gas, oil, water supply and drainage pipes. There many different types of flanges such as SAE flanges (code 61/62 flanges), Slip on flanges, Lapped flanges, Weld neck flanges, and so on.

As the leakage of flange seal can cause the transmission of materials, gas leakage, pollution, and even cause a major fire or personal injury accidents, it must pay attention to the flange seal. This paper analyzes the factors that cause leakage of flange  and puts forward the solution to the solution.

First, the flange

1,  Sealing surface of flange exists in several forms

(1) Flat sealing surface is a smooth plane, usually in the plane with 2-3 concentric groove, tighten the bolt, the gasket material is easy to both inside and outside the squeeze, not easy to compact, only for the pressure is not high , Non-toxic media, non-flammable and explosive occasions.

(2) The concave-convex sealing surface consists of a concave surface and a convex surface, this sealing surface gasket is easy to center, when compress it ,the gasket will not squeeze out.So it can be used for slightly higher pressure occasions.

(3) The tongue and groove sealing surface consists of a tenon and a groove surface, the gasket placed in the tank, will not be squeezed and moved, because the gasket is narrow, the gasket clamping force correspondingly smaller, its shortcomings is the complex of structure and manufacturing , replace the gasket is also more trouble. Generally used for flammable, explosive, toxic media and high pressure occasions.

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Inspection Instructions Of Sae Flange

This instruction is made by Younglee Metal Products Co.,Ltd, complied and implemented by quality department of its SAE Flange factory.


This instruction is intended to strengthen the quality management of flanges, making the quality inspection be processize, standardization, and improve the quality control level. Flanges should meet our factory inspection and testing standards, in addition to the implementation of the contract technical requirements. If there is a conflict between the requirements of the contract and this requirement, it shall perform the higher standard as required.

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Easily distinguishing tips between 304,304H and 304L

304,304H and 304L, What is the difference?

In fact, according to the content of chromium and nickel ,they are all 304 stainless steel, the composition is containing 18% chromium (Cr), 8% nickel (Ni), but the main difference is the percentage of carbon between them.

Stainless steel products you may be interested in:

304, 304L, 304H chemical composition (%) table

304L is ultra-low carbon stainless steel, the carbon content is down to 0.03% or less, to avoid intergranular corrosion, and the effect of stress corrosion resistance is better than 304 in theory, but in practice the effect is not obvious. Reducing the carbon and adding titanium can achieve the same effect, but adding titanium which is 321 stainless has higher smelting costs, the price is more expensive.

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Think you know stainless steel? Not enough

Stainless steel is widely used in various industries and our life. But do you think you know enough about stainless steel? Even if you are some engineer in the steel industry. Here I’d like to write an article of detailed introduction of stainless steel.

This article focuses on the types and characteristics of common stainless steels, as well as the main purpose.

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