JIS G3461 is a standard for carbon steel pipes for boilers and heat exchangers. It is suitable for carbon steel pipes for internal and external heat exchangers, such as boiler water pipes, flues, superheater pipes, air preheater pipes and heat exchanger pipes, condenser pipes, catalytic pipes, etc. in the chemical industry and petroleum industry. But it is not suitable for heating furnace tubes and steel tubes for low-temperature heat exchangers. This standard has detailed regulations on the grade, chemical composition, heat treatment system, mechanical properties and other aspects of steel pipes to ensure that the quality and performance of steel pipes meet the requirements of specific applications. JIS G3461 seamless steel pipe plays an important role in the manufacturing of equipment such as high-pressure boilers and heat exchangers. Its high strength, high corrosion resistance and good thermal conductivity enable it to cope with harsh working environments such as high temperature, high pressure and corrosive medium. At the same time, its precise dimensional control and excellent welding performance also enable these equipment to operate safely, stably and efficiently.
The JIS G3461 standard stipulates the chemical composition requirements for different grades of carbon steel pipes. The following is the chemical composition range of several major pands:
STB340:
| Elements |
Carbon (C) |
Silicon (Si) |
Manganese(Mn) |
Phosphorus (P) |
Sulfur (S) |
| Content |
≤ 0.18% |
≤ 0.35% |
≤ 0.30%~0.60% |
≤ 0.035% |
≤ 0.035% |
STB410:
| Elements |
Carbon (C |
Silicon (Si) |
Manganese(Mn) |
Phosphorus (P) |
Sulfur (S) |
| Content |
≤ 0.32% |
≤ 0.35% |
≤0.30%~0.80% |
≤ 0.035% |
≤ 0.035% |
STB510:
| Elements |
Carbon (C) |
Silicon (Si) |
Manganese(Mn) |
Phosphorus (P) |
Sulfur (S) |
| Content |
≤ 0.25% |
≤ 0.35% |
≤1.00%~1.50% |
≤ 0.035% |
≤ 0.035% |
The production method of JIS G3461 seamless steel pipe mainly involves multiple steps such as raw material preparation, piercing, rolling, heat treatment, finishing and inspection. The following is a pief overview of these steps: raw material preparation, piercing, rolling, heat treatment, finishing, inspection.
JIS G3461 seamless steel pipe has a series of notable features that make it excellent in various industrial applications. The following are the main features of JIS G3461 seamless steel pipe:
1. High strength and excellent mechanical properties: It has excellent mechanical properties and high strength. This allows it to withstand high pressure and high temperature environments, making it suitable for a variety of applications under high loads and harsh conditions.
2. Good corrosion resistance and heat resistance: It has good corrosion resistance and heat resistance. This enables long-term stable operation in humid, corrosive or high-temperature environments, reducing failures and the need for repairs due to corrosion or thermal stress.
3. Precise dimensional control: During the production process, JIS G3461 seamless steel pipes undergo precise rolling and heat treatment processes to ensure the dimensional accuracy and consistency of the steel pipes. This allows the steel pipe to be easily connected and installed with other components and equipment, improving work efficiency and reliability.
4. Excellent welding performance: It has good welding performance and can be connected through various welding methods. This gives steel pipes greater flexibility and convenience when building large equipment or systems.
JIS G3461 seamless steel pipe has a wide range of applications, covering many important industrial fields. The following are its main application areas:
Boiler and pressure vessel manufacturing: boiler tubes, superheater tubes, reheater tubes and other components. Petroleum and chemical industry: In the field of petroleum and chemical industry, JIS G3461 seamless steel pipe is often used in key equipment such as oil pipelines, refining equipment, chemical reactors, and heat exchangers. Electric power industry: In the electric power field, JIS G3461 seamless steel pipes are used to manufacture key components such as steam generators, steam pipes, condenser pipes, etc. Shipbuilding and marine engineering: used to manufacture hot water pipes, steam pipes, desalination equipment, etc. for ships, as well as heat exchangers and piping systems for offshore platforms. Other industrial applications: In addition, JIS G3461 seamless steel pipes are also widely used in other industrial fields such as metallurgy, pharmaceuticals, and food processing.
