Product Specification

GB/T 20409 Seamless Steel Tube: Seamless Multi Rifled Steel Tubes For High Pressure Boiler

Introduction

GB/T 20409 is a Chinese standard that specifies the requirements for seamless multi rifled steel tubes used in high-pressure boilers. These tubes are designed to withstand high pressures and temperatures, making them crucial components in the boiler industry. This article will provide an overview of the material, specifications, key features, chemical composition, mechanical properties, steel grades, applications, and possible alternative grades of GB/T 20409 seamless steel tubes.

Material and Specifications

The GB/T 20409 standard specifies the material and dimensional requirements for seamless multi rifled steel tubes used in high-pressure boilers. The tubes are made of carbon steel or alloy steel, ensuring high strength and resistance to deformation under high-pressure conditions. The standard covers various dimensions and tolerances for the tubes, enabling manufacturers to produce tubes that meet specific boiler requirements.

Key Features

• Seamless Design: GB/T 20409 seamless steel tubes are manufactured without welds, providing a continuous and reliable structure that can withstand high pressures.
• Multi Rifled Surface: These tubes feature a specially designed multi rifled surface that enhances heat transfer efficiency, reducing fuel consumption and improving overall boiler performance.
• High Pressure Resistance: The seamless construction and robust materials of GB/T 20409 tubes allow them to withstand extreme pressure conditions typically encountered in high-pressure boilers.
• Temperature Resistance: These tubes are capable of handling high temperatures without deformation or loss of mechanical properties, ensuring long-term reliability in boiler applications.

Chemical Composition

The chemical composition of GB/T 20409 seamless steel tubes is an essential factor in determining their suitability for high-pressure boiler applications. The following table presents the typical chemical composition:

Note: The above percentages are indicative and may vary based on specific grades.

Mechanical Properties

The mechanical properties of GB/T 20409 seamless steel tubes define their strength, toughness, and ability to withstand high pressures. The following table presents the typical mechanical properties:

Note: MPa denotes Megapascals; HB denotes Brinell hardness.

Steel Grade

GB/T 20409 categorizes seamless multi rifled steel tubes into different grades based on their mechanical properties and chemical composition. These grades help in selecting the appropriate tube for specific boiler applications. Some common steel grades are:

• 20G
• 20MnG
• 25MnG
• 15MoG
• 20MoG

Application

GB/T 20409 seamless steel tubes find extensive usage in high-pressure boilers, where they serve as critical components for heat transfer and steam generation. These tubes are commonly employed in power plants, petrochemical industries, and various manufacturing processes that require steam generation at high pressures and temperatures.

Possible Alternative Grades

While GB/T 20409 seamless steel tubes offer excellent performance for high-pressure boiler applications, alternative grades from other international standards can also be considered. Some possible alternative grades include:

• ASTM A192
• DIN 17175
• JIS G3461
• EN 10216-2

These alternative grades may have different material compositions, specifications, and mechanical properties, but they serve similar purposes and can be used as substitutes for GB/T 20409 seamless steel tubes depending on the specific requirements of the application.

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Our factory covers an area of more than 25,000 square meters and has been in the steel pipe manufacturing business for 20 years. Over this period, we have accumulated a wealth of professional experience, which has helped us establish ourselves as a trusted name in the industry.

At our factory, we specialize in the production of various types of steel pipes, including stainless steel pipe, carbon steel pipe, copper pipe, steel pipe,seamless steel pipe and welded pipe. Our expertise in this field is evident from the 12 patents that we hold, which demonstrate our commitment to innovation and excellence.

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A: manufacturer,also can do trading.

Q: How long is your delivery time?

A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock, it is according to quantity.

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A: Yes, we could offer the sample for free charge but need pay the cost of freight.

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A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.

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