low alloy structural tube
Low alloy seamless steel pipe refers to alloy steel with a total alloy element content of less than 5%. Low alloy steel is relative to carbon steel. It is based on carbon steel pipes. In order to improve the properties of steel, one or several alloying elements are intentionally added to the steel. When the amount of alloy added exceeds the normal content of carbon steel produced by normal production methods, the steel is called alloy steel.
When the total alloy content is less than 5%, it is called low alloy steel pipe. Ordinary alloy steel pipes are generally less than 3.5%. When the alloy content is between 5-10%, it is called medium alloy steel pipe. When the alloy content is greater than 10%, it is called high alloy steel pipe.
The yield point of a steel structure determines the stress the structure can withstand without permanent deformation. The minimum yield point of a typical carbon structural steel pipe is 235MPa. The minimum yield point of a typical low-alloy high-strength steel pipe is 345MPa.
Low alloy structural steel pipes have good forgeability and hardenability, and can be processed and adjusted through heat treatment processes. Through forging and quenching, the strength and hardness of low-alloy steel can be further improved, making it suitable for manufacturing parts that require high strength and wear resistance, such as engine crankshafts, gears, and bearings.
Alloy tube material: 20G (ST45.8-III), 12Cr1MoV, T12, 15CrMo (13CrMo44, STFA22, STPA22, P12), Cr5Mo, 30CrMo, Q345B (16Mn), 27SiMn, 20Cr, 40Cr, 12Cr2Mo, T91, STFA26, 12Cr2MoC , 10CrMo910, A335P22, T22, STFA24.
Low alloy pipe dimensions and allowable deviations：
|
Deviation level |
Standardized outer diameter allowable deviation |
|
D1 |
±1.5%, minimum ±0.75 mm |
|
D2 |
±1.0%.Minimum ±0.50 mm |
|
D3 |
±0.75%． Minimum ±0.30 mm |
|
D4 |
±0.50%.Minimum ±0.10 mm |
low carbon Alloy steel tube
Low alloy seamless steel pipes are widely used in the following fields:
1. Petrochemical industry: used to manufacture pipelines, containers and reactors in petrochemical equipment.
2. Electricity: used in the manufacture of steam pipes, flues and boilers in electrical equipment.
3. Urban construction: used to manufacture beams, columns and walls in building structures.
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