ASTM A485 Grade 1 Grade 2 Grade 3 Grade 4 Seamless Steel Tube: High Hardenability Antifriction Bearing Steel Tube For Auto
Introduction
ASTM A485 is a specification for high hardenability antifriction bearing steel tubes used in the automotive industry. This seamless steel tube is designed to provide excellent wear resistance and durability, making it suitable for various auto applications. In this article, we will explore the material, specification, chemical composition, mechanical properties, and applications of ASTM A485 Grade 1, Grade 2, Grade 3, and Grade 4 seamless steel tubes.
Material
The ASTM A485 Grade 1, Grade 2, Grade 3, and Grade 4 seamless steel tubes are made from high-quality bearing steel. This material is specifically formulated to exhibit excellent hardenability and antifriction properties, making it ideal for use in auto components subjected to high stress and wear.
Specification
The ASTM A485 specification outlines the requirements for seamless steel tubes used in antifriction bearings for automotive applications. The specification covers various grades, including Grade 1, Grade 2, Grade 3, and Grade 4. These grades differ in their chemical composition and mechanical properties, allowing manufacturers to choose the most suitable grade for their specific application requirements.
Chemical Composition
| Grade | Carbon (C) | Silicon (Si) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Chromium (Cr) | Nickel (Ni) | Molybdenum (Mo) |
| 1 | 0.95-1.05 | 0.15-0.35 | 0.25-0.45 | 0.025 | 0.025 | 1.45-1.75 | - | - |
| 2 | 0.95-1.05 | 0.15-0.35 | 0.25-0.45 | 0.025 | 0.025 | 1.45-1.75 | - | 0.07-0.12 |
| 3 | 0.95-1.05 | 0.15-0.35 | 0.25-0.45 | 0.025 | 0.025 | 1.45-1.75 | 0.40-0.70 | - |
| 4 | 0.95-1.05 | 0.15-0.35 | 0.25-0.45 | 0.025 | 0.025 | 1.45-1.75 | 0.40-0.70 | 0.15-0.25 |
Mechanical Properties
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Reduction in Area (%) | Hardness (HRC) |
| 1 | 850-1000 | 600 | 12 | 50 | 58-64 |
| 2 | 850-1000 | 600 | 12 | 50 | 58-64 |
| 3 | 850-1000 | 600 | 12 | 50 | 58-64 |
| 4 | 850-1000 | 600 | 12 | 50 | 58-64 |
Application
The ASTM A485 Grade 1, Grade 2, Grade 3, and Grade 4 seamless steel tubes find extensive use in the automotive industry. These tubes are primarily used in the manufacturing of antifriction bearings, which are critical components in various auto systems. The high hardenability and excellent wear resistance of these steel tubes make them suitable for applications where durability and reliability are essential, such as wheel bearings, transmission systems, and engine components.
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