1. Material Definition and Core Properties
Q: What is ASTM A519 1335 Steel Pipe?
A:
Standard Positioning: High-carbon manganese steel seamless mechanical tubing (UNS G13350), designed for high wear resistance and high strength.
Composition Characteristics:
A combination of carbon (0.33%-0.38%) and manganese (1.60%-1.90%) results in high hardness and hardenability.
Low sulfur and phosphorus content (≤0.035%) ensures material purity.
Key Advantages:
▶ Surface hardness up to 55 HRC (after quenching)
▶ Superior wear resistance compared to ordinary medium-carbon steel (such as 1541)
▶ Suitable for cold deformation (such as cold-drawn precision tubing)
2. Typical Applications
Q: What are the main uses? A:
Wear-Resistant Parts:
✓ Mining Machinery: Conveyor Sprocket Shafts (Surface Hardened to 50-55 HRC)
✓ Agricultural Machinery: Harvester Cutter Barrels (Quenched and Tempered)
Precision Parts:
▶ Hydraulic Cylinders (Inner Wall Roughness Ra ≤ 0.8μm after Cold Drawing)
▶ Bearing Rings (Requires Additional Magnetic Particle Inspection)
Special Applications:
✓ Mold Guide Pins (Replacing Alloy Steel to Reduce Cost)
3. Critical Control Points:
Quenching and Cooling: Water quenching is suitable for simple shapes; complex parts require polymer quenching fluid.
Tempering Time: 1 hour per 25mm thickness (minimum requirement)
4. Key Processing and Quality Control Points
Q: What are the production and processing precautions?
A:
Manufacturing Tolerance (ASTM A519-25):
OD ≤ 50mm: ±0.4mm
Wall Thickness 5-15mm: ±8%
Processing Recommendations:
Cutting: Use CBN tools, linear speed 80-100m/min (hard machining)
Welding: Preheat to 320-350°C (ER80S-D2 welding wire recommended)
Testing Requirements:
▶ 100% eddy current testing (ASTM E309 standard)
▶ Microstructure inspection (no reticular cementite)
