How to get high quality carbon steel pipes?

What is a carbon steel pipe?

Carbon steel pipes are made of carbon steel ingot or solid round steel through perforated pipes and then made by hot rolling, cold rolling or cold rolling.
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What are the different types of carbon steel?
Carbon steel is classified according to how much carbon has been mixed with the base element, iron.
Ultra-high carbon steel is comprised of between 1% and 2% carbon.

  • High carbon steel is .60%-.99%
  • Medium carbon steel is .30%-.59%
  • Low carbon steel is .16%-.29%
  • Mild carbon steel is .05%-.15%

Generally also contain small amounts of silicon, manganese, sulfur, phosphorus and carbon steel, in addition to carbon use can be divided into carbon steel and carbon structural steel, carbon tool steel, and ease of cutting structural steel three categories. Carbon structural steel is divided into building structural steel and machinery manufacturing structural steel two kinds.

According to the carbon steel, carbon content can be divided into low-carbon steel (WC ≤ 0.25%), medium carbon steel (WC0.25% – 0.6%) phosphorus, sulfur content and high-carbon steel (WC> 6%) can be divided into ordinary carbon steel (containing phosphorus, sulfur higher), high-quality carbon steel (containing phosphorus, low sulfur) and high quality steel (phosphorus, sulfur less), generally, the higher carbon content, the higher the hardness, higher strength but lower ductility.
 
Classification of carbon steel pipe

seamless steel pipe and welded steel pipe (slotted tube) two categories. depending on section shape can be divided into circular steel, which is widely used, but there are also some square, rectangular, semi-circular, hexagonal, equilateral triangle, octagon shaped steel tubing. Hydraulic test should be carried out for steel pipes exposed to fluid pressure to test pressure capacity and quality, not leak under pressure, soaked or expansion of qualified, some steel pipe curling trials but also according to the standards or demand side requirements flaring test, flattening test.

Production methods of carbon steel pipe

  • (1) seamless steel pipe- hot-rolled tubes, cold drawn tubes, extruded tube, top tube, cold rolled tube
  • (2) welded steel pipe
  • (A) according to the process- arc welded pipes, electric resistance welded pipe (high-frequency, low frequency), gas pipe, furnace welded pipe
  • (B) according to the weld points – longitudinally welded pipes, spiral welded pipe

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The heat treatment of carbon steel pipe

Carbon steel pipe as a product must have a certain performance to meet the needs of the usage conditions.

Improving the performance of the steel is two ways, First, adjusting the chemical composition of the steel alloying; the other is the heat treatment, heat treatment and shaping deformation combination of approaches. In the field of modern industrial technology, heat treatment to improve the performance of the steel still occupy a dominant position. A wide range of steel pipe, and the appropriate standard for handling, the use of steel vary, sometimes according to their own needs but also to add additional conditions. In the standard, as one of the terms of delivery performance must meet the requirements. The performance of the steel pipes mainly refers to the mechanical properties, physical properties, the use of performance and process performance. Heat treatment by heating, insulation and cooling the steel to obtain the microstructure and corresponding to a variety of performance to meet product standards and requirements of users. 

Heat treatment of carbon steel pipe can be divided into three categories, the final heat treatment processes in order to meet the performance requirements, the heat treatment that the user required to heat treatment delivery, and steel manufacturing process (heat treatment). With other products, product standards and technical conditions required to the steel pipe commonly used in heat treatment process of hardening, tempering, normalizing and annealing. Such as: oil pipe in the casing, tubing, drill pipe, line pipe, etc., according to the level of the steel grade, it is correspondingly normalizing, normalizing plus tempering, quenching and tempering process; high-pressure boiler tubes, high pressure chemical fertilizer pipeline often used normalizing, normalizing plus tempering, quenching and tempering (thick-walled tubes) and solution treatment of austenitic stainless steel; bearing steel pipe ball annealing. Some higher alloy content steel pipe, in order to prevent the user to cracking, deformation, etc., users and standards typically require the production plant to heat treatment delivery, production plants are required, such as annealing, normalizing heat treatment. Between the heat treatment process for cold-rolled, cold drawn steel pipe production process, usually the recrystallization annealing, softening annealing. The aim is to eliminate the cold work hardening effect, reduce hardness and improve toughness in order to facilitate further cooling the deformation process to be implemented.

How to use carbon steel pipe?
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Carbon steel pipe is widely used in the world of manufacturing as they have high end durability. It is one of the preferred pipes when it comes to stamina and cost. Steel tubes of different sizes and shapes can be created with use of modern technology.

Steel pipe is also the want of such manufacturing plants which have pressurized work processes. Grades and specifications are two important terms related to pipes, they need to be checked because your requirements totally depend on these two factors. Thickness defines the type of pipe; it also shows how much pressure it can handle without cracking or bending. Steel manufacturing companies rely on galvanized steel which can be used in creation of pipes.

Carbon steel pipe is well known for its robustness in different conditions. This pipe is also anti corrosive when it comes to working under water. Carbon pipes deliver the right performance without altering the actual required needs. Various heavy industries make use of carbon steel pipe for its strenuous processes. Carbon pipes can be made according to custom requirements; use of welding is required for creation of these pipes.

Why to use Carbon Steel Pipe?

1. Safe and Durable
Steel is frequently used because it is durable and safe. Building materials underground may be susceptible to rotting and pests. Steel will not rot and is impervious to pests like termites.  Steel also doesn’t need to be treated with preservatives, pesticides or glue, so it is safe to handle and work around. Since steel is non-combustible and makes it harder for fire to spread, it is good to use when building homes. Steel frame buildings are more resistant to natural disasters like tornados, hurricanes, lightning strikes, and earthquakes.
Carbon steel pipe is highly resistant to shock and vibration. Fluctuating water pressure or shock pressure from a water hammer have little effect on steel. Today’s heavy traffic conditions impose much stress on roadway foundations. Carbon steel pipe is practically unbreakable in transport and service, and for this reason it is okay to lay water mains under roadways.
The high tensile strength of steel in addition to its elasticity and ductility allow pipes to be used safely for very high pressures. A carbon steel pipe can be made much thinner than pipes made from other materials, so they have a greater carrying capacity than pipes of other materials with the same diameter.

2. Environmentally Friendly
Using steel for pipes is not only safer for people, but it is safer for the earth. Steel can be recycled. Each year, about 70 percent of all steel is recycled in North America, more than paper, aluminum, plastic and glass combined. Steel products can be recycled over and over without losing any strength. Producing steel has also gone green; almost half the world’s steel is produced in electric plants that use recycled scraps and generate no CO2 emissions. Carbon pipe suppliers are happy to know that they are doing their part to keep the Earth clean.

3. Cost-Effective
For any given pressure, carbon steel pipes can be made much thinner than pipes made from other materials, so they have a greater carrying capacity than pipes of other materials with the same diameter. Carbon pipe suppliers know that their steel pipes are cheaper than copper pipes. The unmatched strength of steel piping increases longevity and reduces the need for replacement and repairs.
Its versatility also makes it cost-effective. Carbon pipe suppliers can make pipes in many dimensions, from less than an inch to over five feet. They can be bent and wrought to curve and fit anywhere they need to be. Joints, valves and other fittings are widely available at good prices.

Delivery standard length of carbon steel pipe, also known as user requirements length or the length of the contract, there are four provisions in the existing standards:

A, Normal length (also known as non-random length): any length within the length of the standard required and no fixed length requirements are usually called normal length.

B, Cut length: cut length should be within the range of usual length, which is required in the contract a fixed length dimension. But the actual operation is definitely cut out and it is unlikely, so the standard specifies the length of the length positive deviation allowed. Production decreased length than the length of the tube length of pipe is usually the yield big margin, producers proposed fare increase is reasonable. Markups enterprises are not consistent, usually based on the base price increase of about 10%.

C, Double length: according to the requirement of order, the length is the integer multiple and referred to as double length. double length should be within the range of usual length, the contract should specify a single double length and composition of the total length multiples. In practice, the total length should be based on the allowed positive deviation with 20mm, together with the double length of each single incision margin should remain. If the standard deviation is no double length and cutting margin requirements , should be negotiated by both parties and specified in the contract. Times longer scale length the same length as the production will bring a significant reduction in the yield, so the producers proposed increase is reasonable, and its rate of increase with the length of the rate of increase substantially the same length.

D, Scope length: the length of the range is within typically normal length range, when the user requests a fixed range in which the length of time, they need to be specified in the contract.

How to clean rusted carbon steel pipe?

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For the rusted carbon steel pipe, some people use cleaning, but when cleaning, it note that should a solvent, emulsion cleaning the steel surface, this method is only used as an anti-corrosion auxiliary means, for the real removal carbon steel pipe rust, the role is not strong. In clear carbon steel pipe rust, you can also use steel brushes, wire ball and other tools, such appearance loose oxide, rust easily removed, but not up to the requirements of corrosion. 

Another method is to remove the rust pickling, although this method can achieve a certain degree of cleanliness, but easy on the environment caused by pollution, so it is not recommended that you use. The best method is to use spray rust, leaf through a high-power high-speed rotary motor driven jet, so that grit, steel shot, wire segments, minerals and other abrasive under the centrifugal force on the stainless steel surface spray treatment. Rust is the result of high-power spray jet vane motor driven high-speed reverse, the grit, steel shot, wire segments, abrasive minerals under the effect of centrifugal force on the pipe exterior spray and disposal, shot blasting machine can completely eliminate rust, oxides and dirt, and the ferocity of the abrasive tube shocks and under the effect of friction, but also to reach the needs of the average roughness. Spray rust, can extend the appearance of physical adsorption tube effect, and can enhance the appearance of the pipe coating mechanical adhesion effect. Thus, the injection pipeline corrosion rust is rust fantasy method. In general, abrasive blasting is mainly used inside the tube looks disposal abrator surface rust mainly for pipe surface disposal.

Importance in the production of surface treatment of the importance of strict control of rust when the process parameters, in actual construction, carbon steel pipe coating layer of the peel strength value greatly exceeds the standard requirements to ensure the quality of the coating, in the same equipment on the basis greatly improve the technological level, reduce production costs.

Source: China Carbon Steel Pipes Manufacturer – Yaang Pipe Industry Co., Limited (www.pipelinedubai.com)

(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)

If you want to have more information about the article or you want to share your opinion with us, contact us at sales@pipelinedubai.com

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References:

  • https://www.yaang.com
  • http://www.stlpipesupply.com/blog/reasons-use-carbon-steel-pipe/

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