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Chemical Composition:
- 4130 Steel: This is an alloy steel containing approximately 0.30% carbon, 0.80% manganese, and 0.90% chromium. It is classified as a low alloy steel.
- 4140 Steel: This alloy contains around 0.40% carbon, 0.75% manganese, 0.95% chromium, and adds molybdenum (approximately 0.15-0.25%).

Mechanical Properties:
- 4130: Typically has a tensile strength of around 90-100 ksi (kilopounds per square inch) in the normalized condition. It is known for good weldability and is often used in applications requiring strength but less hardness.
- 4140: Generally has a higher tensile strength, around 100-120 ksi in the normalized condition. It is also known for its good hardenability and is more wear-resistant than 4130, making it suitable for heavy-duty applications.