What are the performance characteristics of low and medium pressure boiler steel tubes according to GB/T3087-2022

GB/T 3087-2022 is a Chinese national standard that specifies the technical requirements for seamless steel tubes used in low and medium pressure boilers. The low and medium pressure boiler steel tubes under this standard have the following performance characteristics:

1. Material and Chemical Composition of Low and Medium Pressure Boiler Steel Tubes

Carbon Structural Steel: Mainly uses No. 20 steel (carbon content ≤0.17%), possessing good plasticity and toughness.

Chemical Composition Control: Strictly limits the content of elements such as carbon, silicon, manganese, phosphorus, and sulfur, affecting the strength, toughness, and corrosion resistance of the steel tube.

2. Mechanical Properties of Low and Medium Pressure Boiler Steel Tubes

Tensile Strength: ≥410 MPa, reflecting stability under high pressure.

Yield Strength: ≥245 MPa, reflecting the deformation capacity of the steel tube under pressure.

Elongation: ≥25%, measuring the plastic deformation capacity of the steel tube, preventing cracking during use.

3. Dimensions and Specifications of Low and Medium Pressure Boiler Steel Tubes

Outer diameter range: 10 mm to 426 mm; wall thickness range: 1.5 mm to 26 mm, offering a variety of specifications.

Dimensional accuracy: Strict control over outer diameter and wall thickness tolerances ensures installation adaptability and interchangeability.

4. Heat Treatment and Processing Properties of Low and Medium Pressure Boiler Steel Tubes

Heat treatment: Cold drawing and normalizing processes refine the grain size, improving strength and toughness.

Processing properties: Flattening, flaring, and edge rolling are available to meet various manufacturing processes.

5. Corrosion Resistance and Oxidation Resistance of Low and Medium Pressure Boiler Steel Tubes

Corrosion resistance: Appropriate chemical composition and heat treatment enhance the corrosion resistance of the steel tubes under high-temperature and high-pressure environments.

Oxidation resistance: Suitable for high-temperature areas of low and medium pressure boilers, such as superheater tubes and reheater tubes.

6. Quality Inspection and Certification of Low and Medium Pressure Boiler Steel Tubes

Inspection Methods: Includes hydrostatic testing, non-destructive testing (such as ultrasonic testing, radiographic testing), etc. The steel tube quality meets standards.

Quality Certification: Steel tubes conforming to GB/T 3087-2022 standards undergo rigorous quality certification to ensure reliability and safety.

7. Application Areas of Low and Medium Pressure Boiler Steel Tubes

Low and medium pressure boilers: Used in the manufacture of key components such as water-cooled walls, superheaters, and steam pipes.

Fluid Transportation: Suitable for fluid pipeline systems in power, chemical, and petroleum industries.

Mechanical Manufacturing and Construction: Also used in machinery manufacturing and light industrial construction.

8. Advantages and Characteristics of Low and Medium Pressure Boiler Steel Tubes

High Strength and High Toughness: High tensile strength and yield strength, good elongation, preventing breakage during use.

Good Machining Performance: Carbon structural steel is easy to process into various shapes and sizes.

Economy: Compared to steel tubes for high-pressure boilers, it has a lower cost and higher cost-effectiveness.