-
About us
Tianjin lefin Industrial
TIANJIN LEFIN STEEL GROUP containing Tianjin lefin Industrial Co.,Ltd. 、Tianjin lefin steel import & export Co.,Ltd and Tianjin Shengqifeng International Trading Co., Ltd. -
Products
Steel Pipe Processing
Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard -
-
Service Capability
Guarantee Quality
Our steel pipes are suitable for oil, natural gas, shipbuilding, chemical industry, water conservancy, electrical, steel structure, construction and other related fields.
Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard
Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard
Has rich experience in steel pipe processing, can be customized according to customer requirements according to the drawing and sample processing, assist in the development of new products.
Product Description
Boiler tubes are the key pipeline materials for transporting high-temperature and high-pressure media in boiler equipment. They are mainly used in thermal power plants, industrial boilers, centralized heating systems, as well as in chemical, metallurgical and other fields. They need to possess characteristics such as high temperature and high pressure resistance, corrosion and oxidation resistance, high strength and high toughness.
Main purpose
Boiler tubes are the core components that form the "vascular system" of a boiler, and they are specifically used for:
- Power plant boilers: water-cooled walls, economizers, superheaters, reheaters, main steam pipes, etc.
- Industrial boilers: Supplying steam and providing heat exchange systems for industries such as chemical, textile, and paper manufacturing.
- Central heating: The hot water supply pipelines of the centralized heating system in northern regions.
Core Requirements and Characteristics
- Resistant to high temperature and high pressure: Can operate stably for a long time at temperatures ranging from 450℃ to 650℃ and pressures above 9.8MPa.
- Corrosion and oxidation resistance: Resistant to corrosion and oxidation by media such as steam and smoke.
- Excellent mechanical properties: High strength and high toughness, ensuring safe pressure-bearing.
- Good thermal conductivity: Efficiently transmits heat energy.
- Strict process requirements: Must pass tests such as water pressure, flattening, expansion, and ultrasonic flaw detection.
International standard system
The production of boiler tubes adheres to strict international standards, which mainly include:
| Region/Country | Main Standards | Scope of Application |
| China | GB/T 3087-2008 | Seamless steel pipes for low and medium pressure boilers (pressure ≤ 5.88 MPa, temperature ≤ 450℃) |
| GB/T 5310-2023 | Seamless Steel Pipes for High-Pressure Boilers (Ultra-Critical and Ultra-Ultra-Critical Units) | |
| American | ASTM A106/A106M | High-temperature seamless carbon steel pipe |
| ASTM A192/A192M | Seamless Carbon Steel Pipes for High-Pressure Boilers | |
| ASTM A213/A213M | Seamless Ferritic and Austenitic Alloy Steel Pipes for Boilers and Superheaters | |
| ASTM A335/A335M | Seamless Ferritic Alloy Steel Pipes for High Temperature and High Pressure Applications | |
European EUROPEAN UNION | EN 10216-2:2014 | Pressure-bearing Seamless Steel Pipes - Non-alloy and Alloy Steel Pipes Specifying High-Temperature Properties |
| German | DIN 17175 | Seamless Steel Pipes for High-Pressure Boilers |
| Japanese | JIS G3461 | Carbon Steel and Molybdenum Steel Pipes for Boilers and Heat Exchangers Requirements for tensile strength and yield strength |
The mechanical performance requirements for boiler tubes of different materials and standards vary. The following are the performance indicators of common grades:
| Standard | Grade / Steel Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |
| GB3087 | Grade 10 steel | 335 - 475 | ≥ 195 | ≥ 24 |
| Grade 20 steel | 410-550 | ≥245 | ≥20 | |
| GB5310 | 20G | 410-550 | ≥245 | ≥24 |
| 20MnG | ≥415 | ≥240 | ≥22 | |
| 15CrMoG | 440-640 | ≥295 | ≥22 | |
| 12Cr1MoVG | 470-640 | ≥255 | ≥21 | |
| 12Cr2MoWVTiB | 540-735 | ≥345 | ≥18 | |
| 10Cr9Mo1VNb | ≥585 | ≥415 | ≥20 | |
| ASTM A192 | A192 | ≥325 | ≥180 | ≥35 |
| ASTM A210 | SA210C | ≥485 | ≥275 | ≥30 |
| ASTM A213 | T11 | ≥415 | ≥205 | ≥30 |
| T22 | ≥415 | ≥205 | ≥30 | |
| T91 | ≥585 | ≥ 415 | ≥20 | |
| T92 | ≥620 | ≥440 | ≥20 |
Core Requirements and Characteristics
- Medium-low pressure boiler tubes (such as 20# steel from GB3087) are typically used in working conditions with a temperature of ≤ 450℃ and a pressure of ≤ 5.88MPa. Their tensile strength is ≥ 410MPa and their yield strength is ≥ 245MPa.
- High-pressure boiler tubes (such as those made of alloy steel in GB5310) are used in ultra-supercritical and super-supercritical units, demanding higher temperature strength and creep resistance. For instance, 12Cr2MoWVTiB (G102) has a tensile strength of 540-735 MPa and a yield strength of ≥ 345 MPa.
- International standard differences: The American standard distinguishes between tubes (Tube, such as A213) and pipes (Pipe, such as A335), but the chemical composition is usually the same (such as T/P91). In the European EN 10216-2 standard, similar grades like X10CrMoVNb9-1 correspond to the American T/P91.
Trend of Material Selection
Currently, supercritical and ultra-supercritical power plant boilers mostly adopt high-performance materials such as T/P91 and T/P92 (corresponding to 12Cr2MoG and 10Cr9MoW2VNbBN in China), which exhibit excellent creep rupture strength at temperatures ranging from 600 to 625 degrees Celsius. These materials have become the main materials for units operating at the 600-degree level.
Address: Hengtai Road,Daqiuzhuang Town,Jinghai County,Tianjin,China
Mob: +8615122229899(whatspp)
Phone: +86 22 58171905
Fax: +86 22 58171902
E-mail:info@lefinsteel.com
Get company updates
Tianjin Lefin Industrial Co.,Ltd. All rights reserved City sub-station SEO www.300.cn