I.Core Value and Multi-dimensional Analysis of Boiler Seamless Pipes
Boiler seamless pipes are indispensable key materials in modern industry, widely used in many fields such as electric power, chemical industry, oil and gas and so on.
In this paper, we will comprehensively analyze the definition, classification, material properties, manufacturing process, specifications, testing methods, application areas and market development trend of seamless boiler steel pipe.
Through the comparative analysis of international and domestic standards, we will discuss the importance of seamless steel tubes in modern industry and the opportunities and challenges of future development.
II.Definition and Basic Characteristics
Boiler seamless pipe is a high-quality seamless steel pipe designed for boilers and related pressure vessels. The manufacturing process of this tube ensures that there are no welded seams within it, which improves the overall strength and reliability.
Its smooth surface can effectively reduce the resistance to medium flow, and it also has good heat resistance and corrosion resistance, so that it can maintain stable performance under severe working conditions.
III. Classification
(1) According to the material classification:
Can be divided into carbon steel seamless steel pipe, alloy steel seamless steel pipe and stainless steel seamless steel pipe. Carbon steel seamless steel pipe is suitable for low and medium pressure boilers, alloy steel and stainless steel seamless steel pipe is used for high pressure or high temperature environment, with higher strength and corrosion resistance.
(2) Classified by use:
Can be divided into power station boiler tubes, chemical boiler tubes, heat exchanger tubes and so on. Steel tubes for different applications differ in specifications and performance to meet the needs of specific working conditions.
(3) According to the pressure level classification:
Can be divided into low-pressure boiler tubes, medium-pressure boiler tubes and high-pressure boiler tubes. The higher the pressure level, the higher the requirements for the strength and high temperature resistance of the steel pipe.
IV.Introduction of Common Types
(1) Carbon Steel Seamless Steel Pipe:
This type of steel pipe is based on carbon steel and is characterized by low cost and good processing performance. It is mainly used in low and medium pressure boilers and is suitable for environments where the working temperature does not exceed 450℃.
(2) Alloy Steel Seamless Steel Pipe:
Alloy steel seamless steel pipe is made by adding alloying elements (such as chromium, molybdenum, vanadium, etc.) to improve its strength and high temperature resistance. It is widely used in high-pressure boilers and high-temperature equipment, able to withstand higher working pressure and temperature.
(3) Stainless Steel Seamless Pipe:
Stainless Steel Seamless Pipe has excellent corrosion resistance and high temperature resistance, which is suitable for chemical industry, food processing and marine engineering. It can resist the erosion of a variety of chemical media, while maintaining good mechanical properties.
(4) High Pressure Boiler Tube:
High Pressure Boiler Tube is a seamless steel tube designed for high pressure boilers with high strength, high toughness and good fatigue resistance. It is usually made of alloy steel and is capable of withstanding extremely high working pressures and temperatures.
V. Seamless steel pipe for boiler specification parameters in detail
| Item | Content | Description |
|---|---|---|
| Common Specifications | Outer Diameter Range: 6 mm - 1240 mm | Includes low and medium pressure boiler pipes (10 mm - 426 mm) and high-pressure boiler pipes (6 mm - 1240 mm). |
| Wall Thickness Range: 1 mm - 200 mm | Low and medium pressure boiler pipes have a wall thickness of 1.5 mm - 26 mm; high-pressure boiler pipes can reach up to 200 mm. | |
| Length Range: Typically 6 meters, 12 meters, or custom | Length can be customized according to user requirements to meet different installation needs. | |
| Selection Criteria | Pressure Class | Low and medium pressure boiler pipes are suitable for working pressures ≤3.8 MPa; high-pressure boiler pipes are suitable for ≥5.9 MPa. |
| Operating Temperature | Grade 20G is suitable for wall temperatures ≤450°C; grade 12Cr1MoVG is suitable for wall temperatures ≤555°C. | |
| Purpose | Low and medium pressure boiler pipes are used for superheated steam pipes, boiling water pipes, etc.; high-pressure boiler pipes are used for high-pressure steam pipelines and heat-exposed tubes. | |
| Specifications in International Standards | GB/T 3087-2022 | Low and medium pressure boiler pipes: Outer diameter 10 mm - 426 mm, wall thickness 1.5 mm - 26 mm. |
| GB/T 5310-2023 | High-pressure boiler pipes: Outer diameter 6 mm - 1240 mm, wall thickness 1 mm - 200 mm. | |
| ASTM A192/A192M | Outer diameter range: 1/2 inch - 7 inches (12.7 mm - 177.8 mm), wall thickness 0.085 inch - 1.000 inch (2.2 mm - 25.4 mm). | |
| EN 10216-2 | Covers a wide range of alloy and carbon steel materials, suitable for high-pressure and high-temperature environments. |
VI. Seamless Steel Tubes for Boilers International Parameters and Related Standards:
(1) American Standard (ASTM A192/A192M)
Scope of Application: Suitable for high pressure boilers, ultra-high pressure boilers, heaters and heat exchangers and other pressure vessels.
Outside diameter range: 1/2 inch to 7 inches (12.7 mm to 177.8 mm).
Wall thickness range: 0.085 inches to 1.000 inches (2.2 mm to 25.4 mm).
Chemical composition: Carbon, manganese, phosphorus, sulfur, and silicon to meet standard requirements.
Mechanical properties: flattening test, flaring test, hardness test and hydraulic test are required.
Main advantages: high strength, high temperature resistance, corrosion resistance, suitable for high pressure and high temperature environment.
(2) European Standard (EN 10216-2)
Scope of application: Suitable for pressure vessels such as high-pressure and ultra-high-pressure boilers, chemical and petrochemical equipment.
Material grade: Including P235GH, P265GH, 16Mo3, 13CrMo4-5, 10CrMo9-10, etc.
Chemical composition: need to comply with international standards, the specific composition depends on the material grade.
Mechanical properties: High strength, durability at high temperature and pressure are required.
Main advantages: Suitable for high temperature and high pressure environments, with good mechanical properties.
(3) International Standards (ISO)
ISO 9000/9001: deals with quality management systems to ensure product quality and consistency.
ISO 1127: specifies dimensions, tolerances and quality per unit length of stainless steel tubes.
(4) Other International Standards
EN 10204: Type of documentation for inspection of metal products.
NACE MR0103/MR0175: Sulfide stress cracking resistant materials for the oil, petrochemical and gas industries.
(5) Common Materials and Properties
Carbon Steel: e.g. ASTM A192 for high pressure boilers with high strength and high temperature resistance.
Alloy steel: such as ASTM A213 (T5, T9, T11, etc.), suitable for high temperature and high pressure environment.
Stainless steel: such as TP304, TP316, suitable for corrosive environments and high temperature applications.
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