1. Key Properties:
High Strength: SAE 4145 is an alloy steel offering high tensile and yield strength, making it well-suited for high-stress applications.
Good Toughness: The material provides excellent toughness, ensuring it performs well under impact and shock loading conditions.
Wear Resistance: Known for good wear resistance, SAE 4145 is capable of handling harsh operating environments.
Weldability: SAE 4145 has good weldability, though, for thicker sections, preheating and post-weld heat treatment may be required to prevent cracking.
Heat Treatable: SAE 4145 can be heat-treated to further improve mechanical properties, providing flexibility in performance for specific applications.
Corrosion Resistance: Offers moderate resistance to corrosion; however, additional coatings or protective measures may be needed for certain environmental conditions.
2. Applications/Industries:
Oil & Gas: SAE 4145 is widely used in the oil and gas industry, particularly in applications such as drill pipes, tubing, and wellhead components where high strength and resistance to harsh conditions are essential.
Automotive: It is used in automotive parts like gears, axles, and crankshafts that are exposed to high-stress environments.
Heavy Machinery: Ideal for heavy machinery components such as shafts, gears, and pressure vessels where high strength and toughness are required.
Mining: Used in mining equipment parts that undergo high wear and stress, such as drill rods and excavator parts.
Aerospace: SAE 4145 is also utilized in aerospace components, including structural elements and landing gears, where high strength and fatigue resistance are needed.
3. Certifications/Standards:
SAE J403: SAE 4145 conforms to the SAE J403 standard for alloy steels, ensuring it meets required chemical composition and mechanical properties.
ASTM A519: This standard applies to seamless carbon and alloy steel mechanical tubing, which is applicable to SAE 4145 seamless pipes.
ISO 9001: Quality management system certification.
4. Chemical Composition:
Carbon (C): 0.42% – 0.50%
Manganese (Mn): 0.60% – 0.90%
Chromium (Cr): 0.90% – 1.20%
Molybdenum (Mo): 0.15% – 0.25%
Silicon (Si): 0.20% – 0.35%
Phosphorus (P): 0.035% max
Sulfur (S): 0.035% max
Iron (Fe): Balance
5. Technical Specifications:
Yield Strength:
SAE 4145: 485 MPa (minimum)
Tensile Strength:
SAE 4145: 655–850 MPa
Hardness:
SAE 4145: Approximately 200–285 HB (Brinell hardness)