1. What is ASTM A519 1518 Steel Pipe?
A: ASTM A519 is the standard specification for seamless carbon and alloy steel pipe used in mechanical engineering and pressure vessels, and 1518 is one of the carbon steel grades (corresponding to UNS G15180). Its composition is 0.15%-0.20% carbon and 1.10%-1.40% manganese. It offers medium strength, good machinability, and weldability, making it commonly used in mechanical components such as shafts and hydraulic cylinders.
2. What are the mechanical property requirements for 1518 steel pipe?
A: According to ASTM A519, typical mechanical properties of 1518 steel pipe include:
Tensile strength: ≥485 MPa (70 ksi)
Yield strength: ≥315 MPa (46 ksi)
Elongation: ≥20% (50mm gauge length)
Hardness: Typically ≤170 HB (Brinell hardness). (Note: Specific values may vary slightly depending on the heat treatment process or size.)
3. What are the main applications for 1518 steel pipe?
Answer:
Mechanical Manufacturing: Drive shafts, gear shafts, hydraulic cylinders;
Automotive: Chassis components, steering systems;
General Engineering: High-stress structural parts, bearing sleeves;
Fluid Transport: Medium- and low-pressure pipelines (subject to additional pressure standards).
4. What are the heat treatment processes for 1518 steel pipe?
Answer:
Normalizing: Improves microstructure uniformity and mechanical properties;
Quenching and Tempering: Used for applications requiring higher strength (e.g., quenching and tempering);
Annealing: Reduces hardness to improve machinability.
(Users must select a process based on the end use; the standard does not mandate a specific heat treatment method.)
5. What are the dimensional and tolerance requirements for 1518 steel pipe? A: ASTM A519 covers seamless steel pipe with an outside diameter of 6.35 mm (0.25 in) to 250 mm (10 in). Tolerances include:
Outer diameter: ±0.79 mm (≤ 48.3 mm) to ±1% (> 114.3 mm);
Wall thickness: ±10% (minimum ±0.4 mm);
Length: Typically fixed or custom lengths are available upon request.
