Boilers, as critical energy conversion equipment, have operational safety that directly impacts life and property security. In recent years, boiler tube "blowout" accidents have occurred frequently, with most cases closely related to the quality of the tube materials. Seamless steel tubes, as the preferred material for boiler tubes, directly determine the safety performance and service life of boilers. This article will provide an in-depth technical analysis of the causes of blowouts and explore how to eliminate safety hazards from the source of material selection.

In-Depth Analysis of Blowout Causes

1.Failure Due to Material Defects

Boiler tubes operate in high-temperature and high-pressure environments. Defects within the material, such as non-metallic inclusions, pores, and microcracks, can become stress concentration points. These defects gradually expand during long-term service, ultimately leading to blowouts. Particularly when inferior seamless steel tubes are used, these defects are often more severe, significantly increasing safety risks.

2.High-Temperature Creep and Microstructural Degradation

Boiler tubes operating under prolonged high temperatures undergo creep, leading to gradual deformation or even rupture. Simultaneously, microstructural degradation phenomena, such as the precipitation and aggregation of carbides and the spheroidization of pearlite, reduce the material's strength and toughness. High-quality seamless steel tubes, through precise chemical composition control and heat treatment processes, can effectively delay these degradation processes.

3.Corrosion and Oxidation Issues

Oxygen, salts, and other substances in boiler water can cause corrosion of the tube material, while high-temperature flue gas leads to oxidation. This corrosion and oxidation thin the tube walls, reducing their load-bearing capacity. Selecting seamless steel tube materials with excellent corrosion resistance and strictly controlling water quality are key to preventing such issues.

Material Selection Standards and Technical Requirements

1.Material Grade Selection

Selecting the appropriate material grade based on the boiler's operating parameters is crucial. Low-pressure boilers can use carbon steel materials like 20G, while medium- and high-pressure boilers require alloy steel materials such as 15CrMoG and 12Cr1MoVG. These specialized seamless steel tubes offer better high-temperature strength and oxidation resistance.

2.Manufacturing Process Requirements

Seamless steel tubes for boilers must be manufactured from high-quality billets through strict smelting, rolling, or forging processes. Hot-rolled seamless steel tubes require normalizing treatment to refine grains and homogenize the microstructure; cold-drawn seamless steel tubes need full annealing to eliminate work hardening and internal stresses.

3.Quality Inspection Standards

Boiler tubes must undergo comprehensive quality inspections, including chemical composition analysis, mechanical property testing, metallographic examination, and non-destructive testing. In particular, ultrasonic testing and eddy current testing can effectively detect internal defects in the material, ensuring the reliability of seamless steel tube quality.

Measures for Quality Control from the Source

1.Strict Supplier Audits

Selecting seamless steel tube manufacturers with relevant qualifications and certifications is essential. Changzhou Tenjan Steel Tube Co., Ltd., as a professional boiler tube supplier, possesses special equipment manufacturing licenses and ISO9001 quality management system certification, ensuring full-process quality control from raw materials to finished products.

2.Comprehensive Quality Traceability System

Establishing a full-process quality traceability system from raw material procurement and production processes to finished product delivery ensures that every boiler tube can be traced back to its specific production batch and process parameters. Changzhou Tenjan Steel Tube Co., Ltd. uses an advanced quality management system to provide customers with complete quality certification documents.

3.Technical Support and After-Sales Service

Excellent suppliers not only provide products but also offer comprehensive technical support and services. Changzhou Tenjan Steel Tube Co., Ltd. has a professional technical team that can provide customers with selection advice, usage guidance, and technical consulting to help them correctly choose and use boiler tubes.

Recommended Professional Manufacturer

Changzhou Tenjan Steel Tube Co., Ltd., as a professional manufacturer of seamless steel tubes for boilers, always prioritizes product quality and safety. The company uses high-quality raw materials, is equipped with advanced production equipment and testing instruments, and strictly adheres to relevant technical standards to ensure every boiler tube meets high-quality requirements.

   The boiler tube products manufactured by the company feature the following:

   Precisely controlled chemical composition and stable, excellent mechanical properties;

   Uniform and dense microstructure, free of harmful inclusions;

   High dimensional accuracy and good surface quality;

   Strict non-destructive testing to ensure no internal defects.

The products are widely used in various power station boilers, industrial boilers, and waste heat boilers, receiving consistent praise from users.

Conclusion

Preventing boiler tube blowout accidents must start from the source of material selection. Choosing high-quality seamless steel tube materials, strictly adhering to relevant technical standards, and establishing a comprehensive quality management system are key to ensuring the safe operation of boilers. It is recommended that users fully consider material performance, manufacturing processes, and quality assurance capabilities when selecting boiler tubes, and choose suppliers like Changzhou Tenjan Steel Tube Co., Ltd., which possess professional qualifications and a robust quality system.

Changzhou Tenjan Steel Tube Co., Ltd. is committed to providing customers with high-quality boiler tube products and comprehensive technical services, helping them eliminate safety hazards from the source. For more product information or technical consulting, please call 0519-88789990 or visit the official website at https://www.tenjan.com/. Choose professionalism, choose safety—let us work together to ensure the safe operation of boiler equipment.