The features of inferior steel pipes

Steel pipes are commonly used due to their durability. It can withstand high pressures and high temperatures. For this reason, it is commonly used for pipelines and natural gas pipelines throughout residential and commercial buildings.

Determining if you have a steel pipe is not difficult. However, there are some things that require special attention to ensure that you do not handle counterfeit or inferior steel pipes at home.4×4 square tubing

The tube has a distinct fold

One of the simplest features that can make inferior steel pipes stand out from their high-quality steel pipes is folding. Folding is a defect for manufacturers that occurs on inferior steel.

You can easily identify this folding defect by looking at the folding of the steel longitudinally throughout the pipe. This type of folding makes the pipe easier to bend. When the tube bends, it cracks along the crease.

This type of steel is simply inferior due to its reduced strength from production defects.

The features of inferior steel pipes

Tube is easy to scratch

An easy way to see if you have a good quality steel pipe is trying to scratch it. Inferior steel is more likely to leave scratches. Look at your pipeline and see if you can identify any scratches.

You can try to scratch the pipe yourself to see if it will leave deep scratches. If the pipe allows for deep scratching, the quality is poor. Realizing that the more scratched the pipe, the lesser it is.

The pipe is oval

The steel tube is specially designed to be round. If you look at your pipe and realize that it has more elliptical shapes, it could be a poor quality product.

In the manufacturing process, inferior steel pipe producers will barely get rid of the rolling of the pipeline. This results in more elliptical tubes than a perfect circular tube.

Pipe has pit

A pit is a small defect in a pipe that looks similar to a corrosion hole. They make the surface of the pipe uneven and easy to identify when looking outside the pipe. This defect occurs during the manufacturing process.

Typically, inferior steel manufacturers use grooved rolls that do not effectively smooth the surface of the steel. When these pits occur, it reduces the overall strength of the steel tube.

Try adding a magnet

One material commonly used as a false steel is aluminum. It is usually painted in the same color as stainless steel to deceive the end user of the fake metal. You can perform a simple test to see if you are working with aluminum or steel, or try to connect the magnet to the pipe.

If the magnet is attracted, the pipe is not aluminum. Instead, it could be steel or other metal material.

For many reasons, many home builders choose steel as their choice. It is durable, heat resistant and high pressure resistant, and lasts for a long time. These are the features you can rely on when you get real steel pipes.

However, when you get poor quality steel or fake steel pipes, you will not get the same quality. It is important to use the above information to ensure that the steel pipe you get is not of poor quality or counterfeit.

What is Stainless steel pipe

Stainless steel pipe is an economical section steel. It is an important product in the steel industry,stainless steel pipe supplier. It can be widely used in living decoration and industry. Many people in the market use it to make stair railings, window guards, railings and furniture. Common materials are 201 and 304.

Production process of stainless steel seamless pipe a. Round steel preparation; b. Heating; c. Hot rolling perforation; d. Cut head; e. Pickling; f. Grinding; g. Lubrication; h. Cold rolling processing; i. Degreasing; j. Solution heat treatment; k. Straightening; l. Cut tube; m. Pickling; n. Product testing.

stainless steel pipe supplier.

Stainless steel pipes are divided into ordinary carbon steel pipes, carbon structural steel pipes, alloy structural pipes, alloy steel pipes, bearing steel pipes, stainless steel pipes, and bimetallic composite pipes, coatings and coated pipes for saving precious metals and meeting special requirements. Stainless steel tubes are available in a wide variety of applications, with different technical requirements and different production methods. The outer diameter of the currently produced steel pipe ranges from 0.1 to 4500 mm and the wall thickness ranges from 0.01 to 250 mm.

The stainless steel pipe is safe, reliable, hygienic and environmentally friendly, economical, the thinning of the pipe and the successful development of a new reliable, simple and convenient connection method, which has the advantage that many other pipes are irreplaceable, and the application in engineering will be more and more The use will become more and more popular and the prospects will be good.spiral welded steel pipe

Since stainless steel already has many of the desirable properties required for building materials, it is seldom seen in metals, and its development continues. In order to make stainless steel perform well in conventional applications, existing types have been improved, and new stainless steels are being developed to meet the stringent requirements of architectural applications. Due to continuous improvement in production efficiency and continuous improvement in quality, stainless steel has become one of the cost-effective materials selected by architects.

Steel pipe manufacturers

Judging from what we can see at the beginning of 2019, it is clear that the situation that made these buyers profitable last year still exists. When these buyers are profitable, so are we.steel pipe manufacturers

But the uncertainty surrounding a factor – the 232 tariffs that have been in effect since last summer – may leave suppliers in trouble and feel cold about our prediction that the tide will improve all ships.

steel pipe manufacturers

The strange thing is that we are not worried that the tariff will remain unchanged.

We are worried that they will be lifted.

These works are in place in another good year.

As mentioned above, the situation is improving, especially in the oil and gas sector. Production in the United States is the highest speed in decades. Although world oil prices fell into a trough last year, the cost per barrel rose again.

We are also paying close attention to the ground conditions in western Texas. The observers they currently face are called “Permian pauses.” Crude oil inventories are increasing because the production of oil-rich basins exceeds the available capacity to ship them to refineries along the Gulf Coast.

Even if the US fossil fuel power generation industry is recently affected by regulatory pressures (and unfavourable public opinion), it seems that the current government is ready to bounce back if it continues to postpone emissions enforcement.

The demand for pipeline products is currently very strong, and we expect it to remain the same. But the tariffs on steel and aluminum levied from traditionally friendly trading partners are the cause of interesting supply.4×4 square tubing

Popular wisdom is not wise to impose new tariffs on old friends. It introduces uncertainty, and the commodity market does not like when they can’t see the glass of the crystal ball.

As a supplier of commodity steel pipe products, when we have a correct understanding of what is going to happen, it is always easier to buy and then priced. Tariffs make the future more difficult to predict. One thing you can predict is that steel importers pass on customs costs to buyers.

But you can’t produce steel pipes overnight, so suppliers can build inventory ahead of time based on forecasts of future demand.

The Steps of Painting Aluminum

With the prominence of aluminum, many people will naturally find it necessary to use a personalized approach, and one of the most common methods is painting. Unfortunately, aluminum is not painted like other materials, such as wood, so this process is not as simple as simply applying a few layers of paint.galvalume metal supplier

That being said, if you know the right way, painting aluminum is simple. The trick of painting materials is to first apply an etch primer to remove the natural oxide layer of aluminum to help the coating adhere to the surface. Failure to do this properly may result in the paint peeling off or falling off shortly after application.

The Steps of Painting Aluminum

Painting Aluminum – Step by Step Guide

Step 1 – Make sure that the surface you are printing on is thoroughly clean and free of dust, grease, oil or any material that may interfere with the adhesion of the paint during and after construction. Aluminum is a sturdy material, so don’t be afraid to use thick brushes, but don’t use steel wool or scouring pads as they can damage the aesthetics of aluminum.

Step 2 – After the material has been thoroughly cleaned, you can continue to apply an etched primer. The smooth surface of the aluminum must be properly worn so that the coating has a place to enter and adhere. For most other materials, this is usually done using sandpaper, but when using aluminum, it is highly recommended that you use an etch primer and hold it for 4 to 6 hours before painting.galvannealed steel sheet suppliers

Step 3 – After proper cleaning and etching of the aluminum, you can use almost any color of paint to color the aluminum. It is important to consider whether the final product is used indoors or outdoors, and what weather conditions it will be exposed to when selecting the coating. As with most coating applications, it is recommended to apply a white primer to the 2 to 3 coats of the desired coating. This will ensure the best results for your new painted materials.

You are likely to encounter paints that claim to be aluminum lacquer in hardware and construction stores, but be careful, because even these paints are likely to need to be applied to the etch primer. Dulux is probably South Africa’s best-known general-purpose paint manufacturer, and they have listed a product called “Dulux Aluminum Coatings” on its website. The product information clearly states that “applicable to metal and wood surfaces, as long as proper preparation and perfusion are carried out.”

alternative plan:

The most important thing to remember when applying aluminum is that it naturally forms a thin layer of alumina on its surface, which makes it a challenging substrate for paint adhesion unless it is sufficiently removed. If you are still not sure if you are applying aluminum, you can choose to buy aluminum sheets or extrusions.steel sheet supplier

Main process characteristics of spiral tube

The spiral pipe is a spiral-slit steel pipe which is made of steel coiled coil as raw material, which is often heated and extruded, and welded by automatic double-wire double-sided submerged arc welding process. The spiral steel pipe feeds the strip steel into the welded pipe unit. After rolling through multiple rolls, the strip is gradually rolled up to form a circular tube blank with an open gap. The reduction of the pressing roll is adjusted to control the weld gap in 1~ 3mm and make the ends of the solder joint flush.square steel tubing for sale

Main process characteristics of spiral tube

Main process characteristics of spiral tube

  1. 100% quality inspection of steel pipes, so that the whole process of steel pipe production is under effective inspection and monitoring, which effectively guarantees product quality.
  2. Adopt advanced double-sided submerged arc welding technology to achieve welding at the best position, and it is not easy to have defects such as wrong side, welding deviation and incomplete penetration, and it is easy to control the welding quality.
  3. During the forming process, the steel plate is deformed evenly, the residual stress is small, and the surface is not scratched. The processed spiral steel pipe has greater flexibility in the size range of diameter and wall thickness, especially in the production of high-grade thick-walled pipes, especially small and medium-diameter thick-walled pipes, which have advantages over other processes and can satisfy users. More requirements on the specifications of spiral steel pipes.tinplate suppliers
  4. All equipment of the entire production line has the function of networking with the computer data acquisition system to realize real-time data transmission, and the technical parameters of the production process from the central control room.

Spiral welded steel pipe stacking rules:

  1. The same kind of materials are stacked separately according to the storage;
  2. It is forbidden to store articles that are erosive to steel in the vicinity of the spiral steel pipe;
  3. There should be a certain passage between the raft and the raft. The inspection road is generally 0.5m. The access passage depends on the material size and the transport machinery, generally 1.5~2.0m;
  4. The principle requirement of spiral steel pipe stacking code is to ensure that the code is stable and safe, and that the materials of different varieties should be palletized separately to prevent entanglement and mutual erosion;welded steel pipe manufacturer
  5. Spiral steel tube steel stacked in the open air, there must be wooden mats or strips underneath, the sloping surface is slightly inclined to facilitate drainage, and pay attention to the flatness of the material to prevent bending deformation;
  6. the height of spiral steel pipe stacking, artificial homework does not exceed 1.2m, mechanical homework does not exceed 1.5m, and the width of the raft does not exceed 2.5m;
  7. The bottom of the spiral steel pipe should be high, strong and flat to prevent the material from being damp or deformed;
  8. The bottom of the raft is high. If the warehouse is a cement floor of the sunny side, the height of the lining is 0.1m; if it is muddy, the height must be 0.2~0.5m. If it is an open space, the concrete floor height is 0.3-0.5m, and the sand surface is 0.5-0.7m high;
  9. The open-pitger angle steel and channel steel should be placed downside down, that is, the mouth should face downward, the I-beam should be placed vertically, and the I-groove surface of the steel should not face upwards to avoid rusting of the water.

304L stainless steel pipe

304L stainless steel pipe belongs to the international stainless steel marking method. 304L stainless steel tube–S30403 (American AISI, ASTM) 304L corresponding Chinese brand is 00Cr19Ni10, characteristics and uses: steel with lower carbon content than 0Cr19Ni9, excellent resistance to intergranular corrosion, no heat treatment parts after welding.304L stainless steel pipes supplier

International stainless steel marking method:

The American Iron and Steel Institute uses three digits to mark various standard grades of malleable. among them:

1 Austenitic stainless steel is marked with numbers in the 200 and 300 series.

2 Ferritic and martensitic stainless steels are represented by numbers in the 400 series. For example, some of the more common austenitic stainless steels,marked by 201, 304L, 316 and 310,

3 ferritic stainless steel is marked with 430 and 446, martensitic stainless steel is marked with 410, 420 and 440C, two-phase (austenitic-ferritic),

4 Stainless steel, precipitation hardened stainless steel and high alloys containing less than 50% iron are usually given a patent or trade name.

304L stainless steel pipe

304L stainless steel tube chemical composition:

Element content of 304L stainless steel tube C≤0.03 Ni8.00~12.00 Cr18.00~20.00, Mn<=2.0 Si<=1.0 S<=0.030 P<=0.035.

304L stainless steel tube 18Cr-8Ni-low carbon is used as low C 304 steel. Under normal conditions, its corrosion resistance is similar to that of 304 steel, but its resistance to intergranular corrosion is excellent after welding or after stress relief; In the case of heat treatment, good corrosion resistance can also be maintained, and the use temperature is -196 ° C to 800 ° C. It is used in field open-air machines for chemical, coal, and petroleum industries with high resistance to intergranular corrosion, heat-resistant parts for building materials, and parts with difficult heat treatment.

304L stainless steel tube type:

1.304L stainless steel tube heat exchanger tube

Condenser, thermal solution treatment, pickling performance characteristics: smooth inner wall of the pipe, low water resistance, erosion and solid solution treatment, the mechanical properties and corrosion resistance of the weld bead are basically the same. Excellent deep processing performance.

2.304L stainless steel tube thin wall stainless steel tube

Uses: Mainly used for direct drinking water projects, other highly demanding fluid transport

Main features: long service life; low failure rate and water leakage rate; good water quality, no harmful objects will be precipitated into the water; the inner wall of the pipe is not crusted, smooth, low water resistance; high cost performance, long service life of 100 years, no Maintenance, low cost; can withstand high water flow erosion up to 30m / s; clear tube laying, beautiful appearance.

3.304L stainless steel tube food hygiene tube

Uses: Milk and food industry, pharmaceutical industry, special inner surface requirements of the industry. ?

Process characteristics: inner bead leveling treatment, solution treatment, inner surface electropolishing

Performance characteristics: the internal surface roughness Ra is more than 0.2, the wall hanging residue is small, easy to clean, prevent bacterial growth, electrolytic polishing has a passivation effect, and the inner wall has good defense performance.

Testing methods: lateral, longitudinal flattening, reverse flattening, hydrostatic testing or eddy current testing, mechanical properties testing, internal surface roughness testing.

4.304L stainless steel tube fluid tube stainless steel tube

Carefully manufactured stainless steel inner flat welded pipe, widely used in dairy products, beer, beverage, pharmaceutical, biological, cosmetic, fine chemical compared to ordinary sanitary steel pipe, its surface finish and smooth inner wall, steel plate flexibility is better, coverage Wide, uniform wall thickness, higher precision, no pitting, good quality.square steel tubing for sale

304L stainless steel tube characteristics

As a widely used steel, 18Cr-8Ni has good corrosion resistance, heat resistance, low temperature strength and mechanical properties; good hot workability such as stamping and bending, no heat treatment hardening (non-magnetic, use temperature -196 ° C ~800 ° C).

304L stainless steel tube use

Household items (1, 2 types of tableware, cabinets, indoor pipelines, water heaters, boilers, bathtubs), auto parts (windshield wipers, molded products), medical equipment, building materials, chemicals, food industry, agriculture, ship parts;

Stainless steel, alloy tool steel (representing C content in parts per thousand), such as: 1Cr18Ni9 one thousandth (ie 0.1% C), stainless C≤0.08% such as 0Cr18Ni9, ultra low carbon C≤0.03% such as 0Cr17Ni13Mo.