Welcome to Wanzhi Group Co., Ltd

Seamless steel pipes inevitably develop rust on their surface over time. Once a steel pipe rusts, it means its life span will be shortened. If you are being troubled by this problem. Wanzhi Steel, as a professional seamless pipe manufacturer and supplier, will help you to learn more about preventing rusting of seamless steel pipe.

Seamless Steel Tubes in China

Seamless Steel Tubes

Seamless Steel Pipe Manufacturer

Seamless Steel Pipe

4 Ways to Remove Rust from Seamless Steel Tube


Solvents and emulsions can be used to remove oil, grease, dust, lubricants, and similar organic substances. However, this does not remove rust, fluxes, etc. from the surface of seamless tubes.


By doing pickling treatment with both chemical cleaning and electrolysis, we can remove scale, rust, and old coating from the surface of seamless steel pipes.

Tools for Rust Removal

The surface of the steel pipe is polished using wire brushes etc. to remove scale, rust, weld slag, etc. Hand tools can remove rust up to Sa2 level, while power tools can remove rust up to Sa3 level.

Spray Descaling

Jet rust removal is done by high-power motors driving the jet blades to rotate at high speed so that abrasives such as steel shot, steel sand, wire segments, and minerals are jetted on the surface of seamless steel pipes under strong force. This method can completely remove oxides.

How to Make Seamless Steel Pipe More Rust-proof?

Seamless steel pipe will inevitably rust after long-term use. If your seamless steel pipe is used in a humid environment, then it will rust even faster. At this point, you may wonder what can be done to slow down the rate of rusting. Wanzhi Steel tells you that galvanizing seamless steel pipe is a good way.

Seamless Steel Pipe After Galvanizing

Galvanized Seamless Steel Pipe

Hot Rolled Galvanized Seamless Pipe

Hot Rolled Galvanized Seamless Pipe

Seamless Galvanized Steel Pipe Quality Inspection

Quality Inspection

Galvanizing Method of Seamless Steel Pipe

1. Hot-dip galvanized
2. Cold galvanized

Hot-dip galvanizing is done by pickling the steel pipe first, removing the iron oxide on the surface of the pipe, and then feeding it into a hot-dip plating bath. In addition, hot-dip galvanizing has the advantages of uniform plating, strong adhesion, and long service life. The zinc consumption of cold-galvanizing is 60%-75% lower than that of hot-dip galvanizing. And the former has a lower zinc layer thickness than the latter. In addition, cold-galvanizing is not as protective as hot-dip galvanizing in terms of corrosion protection.

Applications: cold-galvanizing is generally used in less corrosive applications. While hot-dip galvanizing is used for outdoor applications with high corrosion resistance.

Seamless Steel Pipe Production Line

Seamless Steel Pipe Production Line

Seamless Galvanized Steel Pipes

Seamless Galvanized Steel Pipes

Galvanized Seamless Pipes for Sale

Galvanized Seamless Pipes for Sale

Care and Maintenance of Seamless Steel Tube

Seamless steel pipes are increasingly reused as affordable steel pipes and thus are used in large numbers in different fields. In addition, this kind of steel pipe is often used in our homes, such as stainless steel seamless steel pipe used as drinking water transmission pipe. Although stainless steel seamless pipes are not prone to corrosion, care and maintenance should be taken.

1. Try to install in a clean environment
2. Check and clean regularly
3. Prohibit contact between steel pipe and corrosive substances

Wanzhi Steel reminds you that paying attention to the maintenance of your seamless steel pipes will make them last longer. This also means that it will save you a lot of extra money. Besides, you need to remember that if you have a serious rusting problem with your seamless steel pipe, make sure to seek help from experts who will give you a better solution.

Regular Cleaning of Steel Pipes

Regular Cleaning of Steel Pipes

Keeping Seamless Steel Tubes Clean

Keeping Seamless Steel Tubes Clean

Professional Cleaning of Seamless Steel Pipes

Professional Cleaning


As a leading seamless steel pipe manufacturer in the industry, Wanzhi Steel can provide you with exclusive steel pipe solutions. Meanwhile, we support one-stop purchasing. At Wanzhi Steel, you can purchase not only seamless steel pipes but also welded steel pipes. All in all, our good service attitude and high quality steel pipe products have left an extremely deep impression on our customers. Therefore, if you are looking for such steel pipes, please feel free to contact us by phone or email for more details.

  • 17 years+

    Metal material industry exprience

  • 12 years+

    Import and export experience

  • 120 +

    Countries / regions have global cooperation

  • 1000 +

    Annual export volume

On November 28th, 140 pieces of stainless steel pipes were shipped to Egypt after quality inspection. We shipped strictly according to the customer’s requirements. Our workers strictly check each shipment to ensure that the goods arrive intact. Here are the pictures of stainless steel tube quality inspection and loading for your reference.

Stainless Steel Pipe Quality Inspection

Quality Inspection

Manual Inspection of Stainless Steel Tube Quality

Manual Testing

Stainless Steel Pipe Loading

Stainless Steel Pipe Loading

Wanzhi Steel has over 12 years of industry experience in steel production and export. We can provide high-quality steel products according to your requirements. If you are looking for steel pipe products, welcome to contact us for more details.

Galvanized steel pipes are divided into hot-dip galvanized steel pipes and electro-galvanized steel pipes. Both of them are coated with a layer of zinc on the surface to make the steel pipe anticorrosive and rust-proof. While they both provide corrosion protection, ultimately there are many differences between them. If you are looking for such products, please take a few minutes to understand the difference between hot galvanized steel pipes and electro-galvanized steel pipes.

Electro Galvanized Steel Pipe in Wanzhi Steel

Electro Galvanized Steel Pipe

Hot Dip Galvanized Pipe in China

Hot Dip Galvanized Pipe

1. Different Manufacturing Process

Hot Dip Galvanizing Process

Finished pickling – washing – plating – drying – hanging plating – cooling – medicine – cleaning – grinding – hot galvanized finish

Hot galvanized steel pipe is made by dipping the descaled steel parts into the melted zinc solution at about 500°C to make a zinc layer attached to the surface of the steel parts, thus serving the purpose of corrosion protection. It is often used in construction, electric power, chemical industry, and pipelines for transporting general low-pressure fluids such as gas, oil, etc.

Electro Galvanizing Process

Degreasing – electroplating – passivation – drying – packaging

Electro-galvanized steel pipe is a process that uses electrolysis to attach a metal film to the surface of a manufactured part of metal or other materials. Electro-galvanized steel pipe is a good choice when manufacturing small products that require precise plating, such as machinery manufacturing, electronics, and precision instruments.

Electro Galvanizing Process

Electro Galvanizing Process

Hot Dip Galvanizing Process

Hot Dip Galvanizing Process

Hot-dip Galvanized Coating

Hot-dip Galvanized Coating

2. Different Zinc Content

Electro-galvanized pipe has a very low zinc content of 10 to 50 grams per square meter and is often used indoors for projects that require less corrosion protection. Hot-dip galvanized pipe has a thicker and more uniform coating, typically 30 to 60 microns. As a result, it has a higher corrosion protection capacity and is suitable for use in outdoor projects.

3. Anti-corrosion Performance

Hot-dip galvanizing protects the steel pipe by the principle of zinc’s resistance to atmospheric corrosion. Even if the zinc layer is destroyed, a new film layer is re-formed. Electric galvanizing uses a chemical process to separate the zinc alloy into zinc ions. The zinc layer formed in this way is thin and the steel pipe is prone to rust.

4. Adhesion

The galvanized layer of electro-galvanized steel pipe is an electroplated layer, and the zinc layer is independently layered with the steel pipe substrate and easily peels off. On the contrary, hot-dip galvanized steel pipe has a thicker zinc layer and strong adhesion.

Galvanized Steel Tube Structure

Galvanized Steel Tube Structure

Zinc Layer Thickness

Zinc Layer Thickness

Hot Dip and Electro Galvanized Pipe

Hot Dip and Electro Galvanized Pipe

5. Different Appearance

In comparison to the appearance, the outer wall of hot-dip galvanized pipe is brighter, and the luster inside the pipe is consistent with the outer wall. However, the surface of electric galvanized pipe is not very smooth, and rust will appear on the surface during use.

Which Is Better, Hot or Electro Galvanized Steel Pipe?

When you are ready to buy galvanized steel pipes, you may be torn between hot galvanized steel pipes and electro-galvanized steel pipes. Which one of them is better? Next, Wanzhi Steel will tell you the answer to this question.

Obviously, hot galvanized steel pipes are better. Because the zinc layer of hot-dip galvanized steel pipe has good wear resistance, it can protect the steel itself very well. Even in a harsh environment, hot galvanized steel pipe can perform at its maximum performance. The electro-galvanized steel pipe has a shorter life because the zinc layer is thin and easily peels off, and the corrosion resistance is greatly reduced. All in all, hot galvanized steel pipe is better than electro-galvanized steel pipe in terms of performance and environmental protection.

Galvanized Pipe Production Line

Galvanized Pipe Production Line

Hot Dip Galvanized Square Tubes

Hot Dip Galvanized Square Tubes

GI Steel Pipes in Stock

GI Steel Pipes in Stock


Wanzhi Steel is a leading manufacturer of steel pipes in China. At Wanzhi Steel, you can buy galvanized pipes, stainless steel pipes, carbon pipes, and so on. We promise to provide you with high-quality steel pipes and deliver them on time. In addition, we have professional sales staff at your service. They will help you make a better purchase with the most professional knowledge. If you need steel pipe products, please feel free to contact us for more details.

As for stainless steel pipe grades, you may feel confused to choose. There are 60+ grades of stainless steel, such as 201, 202, 304, 316L, 310s, 321, 309s, 304L, 408, 409, 410, 430, 630, etc. The different grades provide different strengths, corrosion & heat resistance, and other features. You need to choose according to the specified application or use environment. Let’s have a review.

Stainless Steel Pipe Manufacturer

Stainless Steel Pipes

Full Range of Stainless Steel Tubes

SS Steel Tube

Full Series of Stainless Steel Tubes in Wanzhi Steel

Full Series of Stainless Steel Tubes

Different Grades of Stainless Steel Tubes

1. 200 Series

200 series austenitic stainless steel pipe is based on chromium-nickel austenitic stainless steel, to the steel to add manganese and nitrogen instead of nickel elements. Its austenitic elements, in addition to manganese and nitrogen, and generally a moderate amount of nickel (4% to 6%). Manganese in steel plays a role in stabilizing austenite. As nitrogen plays a good solid solution strengthening role, to improve the strength of austenitic stainless steel. Therefore, the 200 series of stainless steel pipes, suitable for heavy loads and corrosion resistance requirements are not too high equipment and components used.

200 Series Stainless Steel Pipe

200 Series Stainless Steel Pipe

300 Series Stainless Steel Pipe

300 Series Stainless Steel Pipe

2. 300 Series

Among the 300 series stainless steel tubes, 304 and 316 stainless steel tubes are the most widely used.

304 stainless steel tube: 304 stainless steel tube is more resistant to rust than the 200 series stainless steel material. It is also better in terms of high-temperature resistance. In addition, 304 stainless steel has excellent stainless corrosion resistance and better resistance to intergranular corrosion. As a result, it is often widely used to make equipment and machine parts that require good overall performance.

316 Stainless Steel Tube: 316 stainless steel tubing is the second most widely used steel grade after 304. 316 stainless steel tubes have better resistance to chloride corrosion than 304 stainless steel tubes and are therefore often used as marine steel. Besides, the addition of molybdenum to 316 stainless steel pipe increases its corrosion resistance, making it very suitable for use in the food industry and the medical sector.

Food Grade SS Tubes

Food Grade Stainless Steel Tubes

304 SS Pipe for Faucet

304 Stainless Steel Faucet

316 SS Tubes for Hospital Equipment

Medical 316 Stainless Steel Tube

3. 400 Series

The following is a list of properties and uses of 400 series stainless steel tubes for your reference.

Grade Properties Uses
409L Corrosion and heat resistant Car exhausts, heat exchangers
410 High strength, good workability, magnetic Knife blades, machine parts
420J1 Hard, corrosion-resistant, and magnetic Tableware, turbine blades
420J2 Hard and magnetic Tableware, knife blades, valves
430 Low thermal expansion, oxidation resistant Household appliances, exterior decorative materials

The chromium content of 400 series stainless steel tubes is lower than that of 300 series stainless steel tubes. However, 400 series stainless steel tubes do not have the same problems with carbon deposits as 300 series. In addition, 400 series stainless steel can be heat treated and used in environments with high temperatures up to 1200F (approximately 393 degrees Celsius). In terms of strength, the 300 series is the same as the 400 series.

Stainless Steel Tube Used As Stair Guardrail


Stainless Steel Tubes are Used As Mechanical Parts

Mechanical Parts

Stainless Steel Tubes Are Used to Manufacture Tableware


4. 500 Series and 600 Series

500 Series – Heat Resistant Chromium Alloy Steels
600 Series – Martensitic precipitation hardening stainless steels

Compared to the other series, the 500 and 600 series stainless steel tubes are not as widely used. If you have any further questions about this, please feel free to contact us for more details.

Which Grade of Stainless Steel Tube Is Best?

The question is often asked which grade of stainless steel pipe is better. In fact, there is no such thing as good or bad. Each stainless steel pipe grades have their advantages and disadvantages, for example, 300 series stainless steel pipe is very rust-proof, but its price is very high. 400 series stainless steel pipe is relatively cheap compared with 300 series, but its rust-proof performance is lower than 300 series stainless steel pipe.

Therefore, the choice of which grade of stainless steel tube you choose should depend on your application and budget. If you are confused about which stainless steel tube to choose, you can choose to consult an expert. Wanzhi Steel offers this service to you, feel free to contact us for your stainless steel tube solution.

Stainless Steel Tubes in Wanzhi Steel

Stainless Steel Tubes in Wanzhi Steel

Stainless Round Pipes in Stock

Stainless Round Pipes in Stock

Stainless Steel Pipe Factory

Wanzhi Factory


As a leading steel pipe manufacturer and supplier in China, Wanzhi Steel offers steel tubes in different materials and grades, sizes and shapes. For stainless steel tube with different grades, they have different features, prices, and use environments. Wanzhi Steel is able to help you to choose the right stainless steel tube grades and types. Welcome to contact us for more information.

Stainless steel tubes are available in various types, such as 201, 202, 430, 409L, 304, 304L, 321, 316L, 309S, 310S. 304 and 316 are the most common types and are widely used for their good corrosion resistance, heat resistance, low-temperature strength, and mechanical properties. Next, Wanzhi Steel takes you through the 304 and 316 stainless steel tubes.

304 Stainless Steel Pipe in Wanzhi Steel

304 Stainless Steel Pipe

High Quality 316 Stainless Steel Tube in China

316 Stainless Tubes

Difference Between 304 and 316 Stainless Steel Tubes

1. Chemical Composition

Product 304 Stainless Steel 316 Stainless Steel
Brand 0Cr18Ni9 0Cr17Ni12Mo2
C ≤ 0.08 ≤ 0.08
Si ≤ 1.0 ≤ 1.0
Mn ≤ 2.0 ≤ 2.0
Cr 18.0~20.0 16.0~18.0
Ni 8.0~10.0 10.0~14.0
S ≤ 0.03 ≤ 0.03
P ≤ 0.045 ≤ 2.0 – 3.0

2. Performance

304 stainless steel pipe is made from austenitic stainless steel. It cannot be quenched like carbon steel and is not magnetic. However, 304 stainless steel pipe has excellent mechanical properties of all kinds and is quite resistant to corrosion and high temperatures. Furthermore, as far as it goes, it is the most widely used.

316 stainless steel tubes are more resistant to acids and alkalis and high temperatures than 304. And 316 stainless steel tubing also has the remarkable feature of being essentially free from thermal expansion and contraction. This characteristic makes it a prime choice for the manufacture of precision parts.

Stainless Steel Tube Quality Inspection

Quality Testing

304 Stainless Steel Tubes Tested and Qualified

Third-party Inspection

3. Corrosion Resistance

316 stainless steel tubes contain more molybdenum than 304 stainless steel tubes. In all types of water (distilled water, drinking water, river water, boiler water, etc.), 304 stainless steel and 316 stainless steel have almost the same corrosion resistance. However, when the medium has a very high content of chloride ions, 316 stainless steel is more suitable.

4. Applications

304 stainless steel tubes are widely used in the industrial and furniture decoration industries because of their good processing properties and high toughness. While 316 stainless steel tubes are extremely resistant to atmospheric corrosion and high-temperature strength and are often used in seawater with equipment, coastal area facilities, chemical, dye, paper, and other industries.

5. Price

Due to the added elements of molybdenum and nickel in 316, 316 stainless steel tubes are more expensive than 304 stainless steel tubes. You can make your choice based on your actual needs and budget. But remember, buying in large quantities is more cost-effective than buying in small quantities. This is because many manufacturers are willing to offer discounts for large volume orders.

SS Pipes for Sale

SS Pipes for Sale

High Quality Stainless Steel Pipe for Sale

SS Steel Pipe Manufacturer

Wanzhi Steel Factory in China

Wanzhi Steel Factory

Are 304 and 316 Stainless Steel Food Grade?

If you are buying stainless steel tubes intended for food processing, you will certainly want to know which grade of stainless steel is food grade.

There are three common food-grade stainless steel materials on the market: 304, 316, and 430 stainless steel.

304 is commonly used in small household appliances or cups, 316 is used in medical devices, and 430 is often used as a stainless steel material for knives. However, the determination of whether a stainless steel tube is food grade is not based on the material alone, but also on whether the manufacturing process has met food-grade standards. Wanzhi Steel can provide different grades of stainless steel tubes to meet the different needs of different projects. If you have any questions about this, please feel free to contact us for more information.

304 Stainless Steel Tubes for Household Appliances

Household Appliances

304 Stainless Steel Tubes for Home Kitchenware


316 Stainless Steel Tubes for Medical Devices

Surgical Trolley

Your Stainless Tubing Solutions Provider

If you want to find a reliable manufacturer to buy stainless steel pipes, Wanzhi Steel will be your best choice. A professional team, advanced equipment, and the ability to supply large quantities make us a leading supplier of steel pipes in China. Our extensive export experience will help you complete your project more quickly. In addition, we also offer galvanized and carbon steel pipes. Contact us today for your steel pipe solution.

Galvanized steel pipes have been protected by zinc coating, which provides excellent corrosion resistance. But when you have purchased a large quantity of galvanized steel pipes, you’d better store these pipes properly. If they are not stored correctly, the steel pipes will rust, which will affect the appearance and even shorten the service life. As one of the top galvanized steel tube manufacturers in China, Wanzhi Steel has some tips for you to help you know how to store steel pipes correctly.

Galvanized Round Tubes at Wanzhi Factory

Galvanized Round Tubes at Wanzhi Factory

Rectangular Tubes in Stock

Rectangular Tubes in Stock

Wanzhi Tips for Tube Storage

1. Storage Environment

Do not put the galvanized steel tubes in corrosive environments, such as humid conditions. Also, keep away from harmful gases or dust, acid, alkali, salt, cement, and other corrosive materials. For long-term storage, it is not wise to place the tubes in the open air because ultraviolet light or rain may cause corrosion. Instead, please store the pipes in a dry and ventilated place. Also, regular inspection is required. If there is oxidation, please clean the surface in time.

2. Storage by Category

Generally, they are stacked separately according to materials, shapes, and specifications. Also, place them in order of entry to facilitate the implementation of the first-in-first-out principle. For example, galvanized steel pipes should not be stacked with stainless steel pipes to prevent confusion and mutual corrosion. Besides, galvanized round tubes are often stacked in bundles to avoid collapse.

3. Pile in Order

When stacking galvanized steel pipes, the bottom of the stack should be padded, firmed, and leveled. The bottom of the stack should be padded to prevent dampness or deformation of the steel pipe. Below is a video showing the steel tubes at Wanzhi Factory.

4. When Stored in Open Air

One of the possible problems of open storage should be safety issues, such as being stolen. Besides, they are susceptible to extreme weather. So if you want to stack galvanized steel pipes in the open air, please use wooden mats or boulders underneath. In addition, keep the stack slightly sloped for drainage. Finally, you must also and pay attention to the straightness of the steel pipe to prevent bending and deformation.

5. Stacking Height & Space

For safety and convenience, the stacking height of galvanized steel pipes should be kept at no more than 1.2 m for manual work and no more than 1.5 m for mechanical work. While the stack width should be within 2.5 m. Too many stacks may cause radial plastic deformation of the steel pipes and damage to the anti-corrosion layer. Also, there should be a certain aisle between the stack and the stack. Generally, the inspection aisle is 0.5 m. While the access aisle depends on the size of the steel pipe and the transport machinery, generally 1.5 to 2. 0 m.

When stacking galvanized pipes, the bottom of the stack must be padded. If the warehouse is on a concrete floor with the sun rising, a height of 0.1 m is sufficient. If the stacking site is an open site, the concrete floor should be 0.3 to 0.5 m high and the sand and mud surface 0.5 to 0.7 m high.

GI Pipe Manufacturer in China

GI Pipe Manufacturer

GI Tubes in China

GI Tubes

Wanzhi Factory

Wanzhi Factory

Because galvanized tube has good ductility, it can be stamped, rolled, stretched, bent, and molded without damage to the coating. Actually, it is easy to store and transport especially the hot-dip galvanized tubes. But the correct stacking of galvanized steel tubes will contribute to the stability of your project. If you purchase lots of steel pipes for sale, you should store them properly to sell them at a better price. So please pay attention to the storage of steel pipes.


Galvanized steel pipe has many great characteristics and it is widely used in construction and other industries. If you want more details, you can contact Wanzhi Steel for assistance. Wanzhi Steel is an experienced manufacturer and supplier of steel pipes in China. Except for galvanized steel pipes, we also have stainless steel tubes and carbon steel tubes for sale. In addition, as a certified galvanized steel pipe supplier, we ensure that all the products we deliver meet the expected requirements. Get in touch with us now.