1. What material is ASTM A519 1025 steel pipe made of?
1025 is a low-carbon steel (carbon content approximately 0.22-0.28%) and is classified as seamless steel pipe for mechanical applications under the ASTM A519 standard. It features moderate strength and good weldability, making it commonly used in mechanical structures and hydraulic systems.
2. What is the difference between ASTM A519 and A53/A106?
Application: A519 is designed for mechanical applications (such as shafts and cylinders), while A53/A106 is primarily used for fluid transport.
Processing: A519 is a cold- or hot-rolled seamless process, while A53 may include welded pipe.
Performance: A519 has more stringent requirements for dimensional accuracy and mechanical properties (such as tensile strength).
3. What are the chemical composition requirements for 1025 steel pipe? **
C: 0.22-0.28%
Mn: 0.30-0.60%
P/S: ≤0.040% (P), ≤0.050% (S)
Other elements (such as Si and Cu) have trace limits. Please refer to Table 1 of ASTM A519 for details.
4. What are the mechanical properties?
Tensile strength: ≥414 MPa (60 ksi)
Yield strength: ≥240 MPa (35 ksi)
Elongation: ≥25% (50mm gauge length)
Hardness is typically HRB 70-85.
5. What are the common size ranges?
Outer diameters are typically 10.3-219.1 mm (0.405-8.625 inches). Wall thickness varies depending on the SCH grade, with SCH 40 and 80 being common. Special sizes can be customized.
6. What are the heat treatment requirements? Typically delivered in the hot-rolled or cold-drawn condition, no additional heat treatment is required.
To improve machinability, normalizing (heating to 900°C followed by air cooling) may be performed.
