ASTM A519 Cold Rolled Cylinder Tube for Automotive Steering

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ASTM A519 Cold Rolled Cylinder Tube for Automotive Steering

ASTM A519 cold rolled cylinder tubes are highly regarded in the automotive industry, particularly for their application in steering systems. These tubes are known for their precision, strength, and durability, making them ideal for critical automotive components.

Material and Designation

• Standard: ASTM A519 specifies the requirements for seamless carbon and alloy steel mechanical tubing.

• Material Grade: Common grades include 1010, 1020, 4130, and 4140, each offering different mechanical properties.

• Condition: Cold rolled to enhance mechanical properties and surface quality.

Chemical Composition

Typical chemical compositions for popular grades include:

• Grade 1010:

• Carbon (C): 0.08-0.13%

• Manganese (Mn): 0.30-0.60%

• Phosphorus (P): ≤ 0.04%

• Sulfur (S): ≤ 0.05%

• Grade 1020:

• Carbon (C): 0.18-0.23%

• Manganese (Mn): 0.30-0.60%

• Phosphorus (P): ≤ 0.04%

• Sulfur (S): ≤ 0.05%

• Grade 4130:

• Carbon (C): 0.28-0.33%

• Manganese (Mn): 0.40-0.60%

• Chromium (Cr): 0.80-1.10%

• Molybdenum (Mo): 0.15-0.25%

• Grade 4140:

• Carbon (C): 0.38-0.43%

• Manganese (Mn): 0.75-1.00%

• Chromium (Cr): 0.80-1.10%

• Molybdenum (Mo): 0.15-0.25%

Mechanical Properties

• Tensile Strength: Varies by grade; for example, 4130 typically has 560-740 MPa.

• Yield Strength: Varies by grade; for example, 4130 typically has 460-620 MPa.

• Elongation: Minimum 15% for most grades.

• Hardness: Typically 170-220 HB for carbon steels, 200-250 HB for alloy steels.

Manufacturing Process

• Cold Rolling: Reduces diameter and wall thickness, improves surface finish, and enhances mechanical properties.

• Heat Treatment: Includes processes like normalization and tempering to improve ductility and relieve internal stresses.

• Surface Treatment: Options such as phosphating and oiling to enhance corrosion resistance and surface quality.

Applications

• Automotive Steering Systems: Essential for precise and reliable performance in steering components.

• Suspension Systems: Used in various suspension components requiring high strength and precision.

• Hydraulic Cylinders: Suitable for use in hydraulic systems within automotive applications.

• Mechanical Components: Ideal for parts demanding high dimensional accuracy and mechanical robustness.

• Construction Equipment: Employed in heavy-duty machinery parts for their strength and durability.

Advantages

• High Precision: Cold rolling ensures tight dimensional tolerances critical for steering components.

• Superior Surface Quality: Smooth surface finish reduces friction and wear, enhancing the lifespan of automotive parts.

• Mechanical Strength: High tensile and yield strength suitable for high-stress applications.

• Corrosion Resistance: Enhanced by surface treatments like phosphating and oiling.

• Durability: High resistance to mechanical stress and environmental factors ensures long service life.

Dimensions and Tolerances

• Size Range: Available in a variety of diameters and wall thicknesses to meet specific automotive requirements.

• Tolerances: Maintained to precise standards for consistency and reliability.

Testing and Certification

• Quality Control: Comprehensive testing including dimensional inspection, mechanical testing, and non-destructive testing.

• Certification: Provided with certifications as per ASTM A519 standards, including mill test certificates (MTC) to verify compliance with specifications.

Summary

ASTM A519 cold rolled cylinder tubes are the preferred choice for automotive steering systems due to their precision, mechanical strength, and excellent surface quality. These tubes are engineered to meet the rigorous demands of the automotive industry, ensuring durability and reliable performance in steering and other critical applications.