A691 1 CR Class20 EFW Steel Pipe for high pressure
A691 1CR CL20 alloy pipe is a high temperature and high pressure electric fusion welded alloy steel pipe of standard A691, which is used in chemical high temperature equipment, power station heat exchange equipment and other fields.
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Product Introduction
A691 1 CR Class 20 high temperature electric fusion welded pipe is a chromium-molybdenum (Cr-Mo) heat-resistant steel pipe under ASTM A691 standard, specially designed for harsh environments such as chemical, power or nuclear power equipment.
Features
- Material equivalence: The composition is equivalent to SA-335 seamless pipe (such as 1%Cr, 1/2%Mo), but A691 is in the form of welded pipe, which is cheaper and suitable for large-diameter or customized production.
- Manufacturing process: Electric fusion welding (such as JCOE straight seam submerged arc welding) is mostly used to ensure that the weld quality passes the radiographic inspection (such as film inspection) to meet the safety standards of high-pressure vessels.
- Application areas: Widely used in power equipment welded pipes, chemical plant pipelines and nuclear power systems, such as high-temperature steam transportation or high-pressure gas pipelines, and can withstand mechanical stress under extreme working conditions.
| TABLE 1 Plate Materials | ||||
| Pipe Grade | Type of Steel | ASTM Specification | HB, max A | |
| Number | Grade | |||
| 1CR | 1 % chromium,1 ⁄ 2 % molybdenum steel | A387/A387M | 12 | 201 |
| TABLE 2 Heat Treatment Parameters A | |||||
| Pipe Grade | ASTM Specification |
Post-Weld Heat-Treat Temperature Range (StressRelieving), °F (°C) |
Normalizing Temperature, max unless otherwise noted, °F (°C) |
Quenching Temperature, max unless otherwise noted,°F (°C) |
Tempering Temperature, min, °F(°C) |
| 1CR | A387/A387M | 1100 to 1350 [590 to 730] | 1850 [1010] | 1700 [925] | 1150 to 1375 [620 to 745] |
| Class designations are as follows | |||
| Class | Heat Treatment on Pipe | Radiography, see Section |
Pressure Test, see Section |
| 20 | stress relieved, see 5.3.1 | none | none |
Case of A691 1 CR Class20 Alloy Steel Pipe
Chemical Plant
oil plant
power plant
Applications
- Power equipment: Widely used in high-temperature steam transmission pipeline systems in thermal power plants, which need to withstand extreme temperatures (usually >500°C) and high-pressure environments to ensure the safe operation of generator sets.
- Chemical equipment: Process pipelines used in industries such as oil refining and fertilizers to transport corrosive media or high-temperature gases/liquids. Its chromium-molybdenum alloy composition provides corrosion resistance and creep resistance.
- Nuclear power system: As an auxiliary pipeline for nuclear power plants, it meets the reliability and long-term stability requirements of high-pressure systems.
- Large-diameter main transmission pipelines: Suitable for energy transmission pipelines (such as gas and high-temperature fluids) that require customized sizes. The electric fusion welding process can achieve efficient production of large-diameter pipes.
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