Press Releases from Permanent Steel Manufacturing Co.,Ltd (29 total)
Is the Welded Pipe Hot Rolled or Cold Rolled?
Welded pipe production process:
Welded pipe, also known as welded steel pipe, is a steel pipe made by applying welding technology to roll steel plate or strip into a tube shape, and then flattening, crimping, welding and leveling.
Generally, the production process of welded pipes is divided into three processes: hot rolling, cold rolling and cold drawing. Among them, hot-rolled welded pipes are welded by hot-rolling steel strips at high temperatures, while…
How to Choose the Right Square and Rectangular Tube?
What is a square and rectangular tube?
Square tube or rectangular tube is a tube with a square or rectangular cross-section. Common materials include ordinary carbon steel, alloy steel, stainless steel, etc. Square or rectangular tubes are more suitable for use than ordinary round tubes in some scenarios because of their square or rectangular cross-section. How to choose the appropriate square and rectangular tube? The Permanent Steel square and rectangular tube…
Explanation of Common Defects in ERW Welded Pipes
Explanation of common defects in ERW welded pipes:
Undercut
Undercut is a groove that appears along the centerline of the weld in the transition area between the edge of the weld and the pipe body. Undercut occurs when welding speed, current, voltage and other conditions are not properly matched.
lap welding
The upper and lower edges of the steel plate are misaligned and butted, resulting in uneven welds, which become pipe seam misalignment or…
Carbon Steel Pipe vs Stainless Steel Pipe: Material Difference and Applicable Sc …
In today's industrial field, carbon steel pipe and stainless steel pipe are one of the most commonly used piping products. Although they are both used to transport gases and liquids, their materials vary widely. This article will conduct a detailed analysis of the material differences and applicable scenarios of carbon steel pipes & tubes (CS pipe) and stainless steel pipes (SS pipe) from four aspects.
1. Chemical composition
The main components of…
Three Surface Treatment Processes for Seamless Pipes - Pickling, Passivation and …
Seamless pipe (SMLS) pickling process:
1. Definition of pickling: Acids use chemical methods to remove oxide scale according to a certain concentration, temperature, and speed, which is called pickling.
2. Pickling classification: According to the type of acid: sulfuric acid pickling, hydrochloric acid pickling, nitric acid pickling, hydrofluoric acid pickling. Pickling must use different media according to the material of the steel, such as pickling carbon steel with sulfuric acid and hydrochloric…
Characteristics and Application of Low Temperature Seamless Steel Pipe
Low temperature resistant seamless steel pipe is a steel pipe product used in special environments. The main requirement is that the finished steel pipe has good impact toughness in a low temperature environment (usually below -45°C). Ensure that no low temperature brittle fracture occurs during use. The product category of PMC low-temperature pipe covers the low-alloy steel grades in ASTM A333/A334. At the same time, as a professional oil casing…
Identification Method of Welded Steel Pipe and Seamless Steel Pipe
Common steel pipes mainly include welded pipes and seamless pipes (SMLS). In the process of engineering construction, appropriate steel pipes will be selected in combination with specific construction conditions, and cost will be the primary factor. Therefore, this paper distinguishes welded steel pipes and seamless steel pipes from the aspects of steel pipe performance, technology and identification methods, hoping to provide reference for the selection of steel pipes in the…
Quality Defects and Prevention of Oil Well Pipe
The quality defects of oil well pipes mainly come from three aspects:
The first is the quality defect of the oil well pipe body itself, such as the mechanical properties of the pipe body, the inner connection, the weighing, etc., which do not meet the requirements;
The second is the quality defect produced during the processing of the oil well pipe, such as the thread parameters (taper, thread pitch, tooth…
Analysis and Comparison of Eddy Current Testing and Magnetic Flux Leakage Testin …
Analysis and comparison of eddy current testing (ET) and magnetic flux leakage testing (MFL) of seamless tube(SMLS):
With the development of the national economy, all kinds of seamless tubes are widely used in petrochemical and boiler manufacturing industries, especially in harsh working conditions such as high temperature and high pressure, which have higher requirements for the quality of seamless steel tubes. Seamless steel tubes are generally made through the processes of…
Submerged Arc Welding - the Most Practical Steel Pipe Welding Technology
Submerged arc welding (SAW) is one of the most efficient mechanized welding methods today. Its full name is automatic submerged arc welding, also known as automatic arc welding under the flux layer.
Submerged arc welding technology is ideal for important applications such as pipelines, pressure vessels and storage tanks, rail manufacturing and large-scale construction. Available in the simplest form of single wire, double wire construction , series double-filament structure, multi-filament structure.
Submerged…
Innovation of Cold Drawing Process of Seamless Steel Pipe and its Existing Probl …
Speeding up and strengthening the drawing process of seamless steel pipes, improving the quality of pipe making, and improving the intermediate process are the keys to simplifying the cold drawing process of seamless steel pipes and winning "high yield, high quality, multiple varieties, and low consumption". The following seamless steel pipe manufacturers will introduce to you the main experience and exploration work in this regard.
1. Hammer Technique
Change to hot rolling…
Ten Ways to Remove Burrs from Steel Pipes
Burrs are ubiquitous in the metalworking process. No matter how advanced and sophisticated equipment you use, it will be born with the product. It is mainly due to the plastic deformation of the material and an excess iron filings generated on the edge of the processed material, especially for materials with good ductility or toughness, which are particularly prone to burrs.
The types of burrs mainly include flash burrs, sharp corner…
Tension Adjustment of Sizing Section of High Frequency Straight Seam Welded Pipe
In order to ensure that "tube pulling" and "tube stacking" do not occur in the forming section, welding section and sizing section, according to the rolling principle of high-frequency straight seam welded pipe (ERW), it is necessary to ensure that the welded tube blank maintains proper tension in each section.
In addition to the pass speed and rolling force, the factors that affect the tension are the sizing allowance, the outer…
The Advantages and Selection Criteria of Seamless Steel Pipes
The advantages of seamless steel pipes are high pressure resistance, good toughness, long pipe sections and few joints. The disadvantage is that it is expensive, easy to corrode, and thus has a short service life.
(1) Ordinary seamless steel pipe
Ordinary seamless steel pipes are rolled from ordinary carbon steel, high-quality carbon steel, low-alloy steel or alloy structural steel. Variety of specifications, high strength,
It is the most commonly used pipe material for…
Performance Comparison of ERW and Spiral Steel Pipe
Performance comparison of carbon ERW steel pipe and spiral steel pipe:
1. Overview
The welding of ERW steel pipe is the skin effect and proximity effect of high-frequency current. The process of using high-frequency current and induced high-frequency current (rising at the end of the 20th century) resistance to heat and melt the edge of the tube blank, and apply squeezing force to weld together process.
The welding of SSAW steel pipe is…
Difference Between 304 and 316 Stainless Steel
I believe that many people now have stainless steel containers in their homes. Why are stainless steel containers favored by so many people because they will not rust and are very resistant to high temperatures. It is also very convenient to clean, but when we buy, we must distinguish between 316 and 304 stainless steel. Although they are all stainless steel, the difference is very large. Today, I will introduce…
Seamless Black Steel Pipe Manufacturer and Suppiler in China
Seamless Black Pipe, Black Steel Pipe Schedule 40 Seamless, Black Steel Pipe Schedule 80 Exporter
What are black steel pipes?
Black steel pipe is made up of steel that has not being galvanized. Its name comes from the skin, dark-colored iron oxide coating on its surface. It is used in applications that does not requires galvanized steels. Black steel pipe's strengths makes them ideal for transporting gas and water in urban and…
The Basic Process of High-frequency Welded Pipe Sizing
The sizing of high-frequency straight seam welded pipes (ERW welded pipe) refers to the rolling of welded pipes after welding by rollers of a specific pass, and the round or special-shaped pipes of irregular size and shape are adjusted to finished pipes with regular shapes and sizes that meet the requirements of the standard. The basic functions of diameter technology have four aspects.
1) Determine the basic size and shape of…
Causes of Well Casing Pipe Damage and Repairing Technology
How to prevent well casing pipe damage? How to repair well casing to restore its production? These are important questions in the development of oil field.
Causes of well casing pipe damage:
Improper production method
Excessive differential pressure in production. Over-fast exploitation will destroy the stratum structure, and cause large quantities of sand flow into the wellbore.
Improper stimulation measures
High pressure operation will damage the low-strength casing. High pressure in fracturing, acidizing will cause…
High Frequency Welded (HFW) Pipe
The straight seam high frequency welded (HFW) pipe has the characteristics of simple production process and fast continuous production. It has a wide range of uses in civil construction, petrochemical, light industry and other fields. It is mainly used to transport low-pressure fluids or manufacture components and light industrial products for various projects.
High-frequency welding is a kind of induction welding (or pressure contact welding). It does not require welding seam…
The Significance of Studying the Heat-Affected Zone of Welded Pipe Welding
Welding heat-affected zone（HAZ) is different from welding seam. Welding seam guarantees performance requirements through chemical composition adjustment, redistribution and proper welding process, while the performance of heat-affected zone cannot be adjusted by chemical composition. This is due to the microscopic effect of thermal cycling. Due to the uneven distribution of the structure, for general welded structures, the hardening, embrittlement, toughening and softening of the heat-affected zone, as well as comprehensive…
Carbon Seamless Steel Pipe for Fluid Transportation
Fluid pipes are pipes specially used for conveying media with fluid properties.
Medium with fluid properties, in addition to liquid media such as water, oil, and solution, solid media such as cement, grain, and coal powder can also flow under certain conditions.
The fluid tube can be made of steel, copper, titanium and other non-ferrous metals, or even plastic and other non-metallic materials.
The fluid pipe must have a hollow cross-section, and it…
Application of Electric Resistance Welding in Industrial Production
Electric resistance welding (ERW) was invented at the end of the 19th century. It is a method of welding by applying pressure to the assembled weldment through electrodes and using the resistance heat generated by the contact surface of the joint and the adjacent area of the electric current. Electric resistance welding has high production efficiency, good quality, and low cost. It is easy to realize mechanization and automation. It…
Comparison of ERW Welded Pipe and Seamless Steel Pipe (tested by PetroChina Pipe …
1. Outer diameter tolerance
ERW steel pipe: It is cold-formed and sizing is completed by reducing the diameter by 0.6%. The process temperature is basically constant at room temperature. Therefore, the outer diameter is controlled accurately and the fluctuation range is small, which is helpful to eliminate black leather buckles.
Seamless steel tube: The hot-rolling forming process is used, and its sizing is completed at about 8000C. The raw material composition, cooling…
What Corrosion Phenomena Will Occur in Thick-walled Steel Pipes in the Construct …
Metals can react with oxygen in the atmosphere to form an oxide film on the surface. The iron oxide formed on ordinary carbon steel will continue to oxidize, causing the rust to continue to expand and forming holes in the later stage. This can use paint or oxidation-resistant metal plating to protect the surface of carbon steel, but this protective layer is just a thin film. If the protective layer…
Non-destructive Testing of A53 ERW Welded Pipe
In order to protect the quality of the ERW welded pipe we produce, we will conduct quality inspection on each welded pipe produced. So what are the inspection methods for welded pipe? Today we will follow the editor of the Permanent Steel Manufacturing Co., Ltd welded pipe manufacturer to understand a bit.
At present, the most common detection method we use is to use magnetic powder to detect the quality of…
Application of Seamless Steel Tube in Automobile Manufacturing Industry
Seamless steel pipes have a hollow section and are used in large quantities as pipelines for conveying fluids, such as pipelines for conveying oil, natural gas, gas, water and certain solid materials. Automobile welded steel pipe is one of the most important varieties of precision welded pipes. The main varieties are automobile transmission shaft pipes, automobile muffler pipes, automobile condenser pipes, automobile exhaust pipes, automobile control shaft pipes, automobile thrust…
Specific Application of 40Cr Seamless Steel Pipe in Bridge Engineering
40Cr seamless steel pipe, also known as galvanized steel pipe, is divided into two types: hot-dip galvanized and electro-galvanized. The hot-dip galvanized layer is thick and has the advantages of uniform coating, strong adhesion and long service life. The cost of electro-galvanizing is low, the surface is not very smooth, and its corrosion resistance is much worse than that of hot 40cr seamless steel pipe. 40cr seamless steel pipe used…
Oil and Gas Storage and Transportation Projects Promote the Use of ERW Steel Pip …
The operation conditions of oil storage and transportation system in petrochemical enterprises are relatively "mild" compared with production equipment. Its working pressure is generally below 2.5Mpa, in some cases up to 4.0 Mpa; the working temperature is generally below 100 °C, the highest does not exceed 1809C, only when purged with 1.0Mpa steam, the highest temperature up to about 250 °C. Various oil products-generally no corrosion or only slight corrosion.…
