ASTM A519 4140 Seamless Steel Pipe is a specification standard for alloy steel pipes, commonly used in the manufacturing of pipes and fittings for high-temperature and high-pressure environments. This type of pipe finds wide application in industrial sectors, particularly in the petroleum and natural gas industries, as well as in aerospace and automotive industries. 4140 alloy steel pipe exhibits excellent strength and corrosion resistance, suitable for various engineering requirements.
Chemical Composition (Typical):
- Carbon (C): 0.38-0.43%
- Manganese (Mn): 0.75-1.00%
- Phosphorus (P): Maximum 0.035%
- Sulfur (S): Maximum 0.040%
- Silicon (Si): 0.15-0.35%
- Chromium (Cr): 0.80-1.10%
- Molybdenum (Mo): 0.15-0.25%
Mechanical Properties (Typical):
- Yield Strength: Approximately 95,000 psi (approximately 655 MPa)
- Tensile Strength: Approximately 110,000 psi (approximately 760 MPa)
- Elongation: Approximately 20%
Wall Thickness Tolerance (According to ASTM A519 Standard):
- For pipes with thickness less than 2.5mm, the tolerance is ±12.5%.
- For pipes with thickness 2.5mm and above, the tolerance is ±10%.
Dimensional Tolerance (According to ASTM A519 Standard):
- The outer diameter tolerance is typically ±1% of the pipe diameter.
- The inner diameter tolerance is typically -0% to +10% of the pipe diameter.
- The length tolerance is typically ±3mm of the pipe length.