ASTM A485 Steel Seamless tube, Grade 2

ASTM A485 Steel Seamless tube, Grade 2 Product Information -:- For detailed product information, please contact sales. -: ASTM A485 Steel Seamless tube, Grade 2 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A485 Steel, Grade 2 Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A485 Grade 2 High-Hardenability Steel** #### **1. Overview** ASTM A485 Grade 2 is an ultra-high hardenability bearing steel designed for applications requiring maximum depth of hardening in very large cross-sections. This grade offers superior hardenability characteristics compared to Grade 1, making it suitable for the largest and most demanding bearing components and heavy-duty mechanical parts. #### **2. Key International Standards** - **Primary Standard:** **ASTM A485** - Standard Specification for High Hardenability Anti-Friction Bearing Steel - **Processing Condition:** Typically supplied spheroidize annealed for machining - **International Equivalents:** - **ISO 683-17:** 100CrMnSi5-4-2 - **DIN:** 100CrMnSi5-4 - **JIS G4805:** SUJ4 (similar application) #### **3. Chemical Composition (Weight %)** | Element | Composition (%) | |---------|-----------------| | Carbon (C) | 0.90-1.05 | | Manganese (Mn) | 0.95-1.25 | | Silicon (Si) | 0.45-0.75 | | Chromium (Cr) | 1.05-1.35 | | Molybdenum (Mo) | 0.20-0.30 | | Phosphorus (P), max | 0.025 | | Sulfur (S), max | 0.025 | *Note: The increased manganese, chromium, and addition of molybdenum provide the enhanced hardenability characteristics.* #### **4. Mechanical & Physical Properties** **Heat Treated Properties (Oil Quenched & Tempered):** - **Hardness:** 58-65 HRC (typical) - **Tensile Strength:** 2050-2450 MPa (297-355 ksi) - **Yield Strength:** 1650-2050 MPa (239-297 ksi) - **Impact Toughness:** Good for through-hardened steel **Physical Properties:** - **Density:** 7.83 g/cm³ - **Modulus of Elasticity:** 205 GPa - **Thermal Conductivity:** 41 W/m·K (at 100°C) - **Coefficient of Thermal Expansion:** 12.4 × 10⁻⁶/K (20-100°C) #### **5. Product Applications** - **Extra-Large Bearings:** Bearings with cross-sections over 100 mm - **Heavy Equipment Components:** Large rolling mill bearings, mining equipment bearings - **Aerospace Bearings:** Critical aircraft bearing components - **Large Gears:** Heavy-duty transmission gears for industrial machinery - **Specialty Components:** High-stress parts requiring maximum hardenability #### **6. Key Characteristics & Advantages** - **Ultra-High Hardenability:** Maximum depth of hardening in very large sections - **Uniform Microstructure:** Consistent martensitic structure throughout large cross-sections - **Superior Wear Resistance:** Excellent resistance to rolling contact fatigue - **High Compression Strength:** Withstands extreme compressive loads - **Good Dimensional Control:** Predictable transformation during heat treatment #### **7. Heat Treatment Requirements** - **Annealing:** Spheroidize annealed at 790-810°C - **Hardening:** Austenitize at 830-850°C, oil quench - **Tempering:** 150-200°C for maximum hardness and stability - **Hardenability Band:** J9=15 min (Jominy test) #### **8. Fabrication Considerations** - **Machining:** Good machinability in annealed condition (187-229 HB) - **Grinding:** Excellent grinding response with proper techniques - **Dimensional Stability:** Requires careful heat treatment control - **Non-Destructive Testing:** Magnetic particle inspection recommended for critical applications ASTM A485 Grade 2 provides the ultimate solution for applications requiring maximum hardenability in bearing steels, offering manufacturers the capability to produce extremely large components with uniform hardness and exceptional performance characteristics for the most demanding industrial applications. -:- For detailed product information, please contact sales. -: ASTM A485 Steel, Grade 2 Specification Dimensions Size： Diameter 20-1000 mm Length <4396 mm Size:We can customized as required Standard： Per your request or drawing We can customized as required Properties（Theoretical） Chemical Composition -:- For detailed product information, please contact sales. -: ASTM A485 Steel, Grade 2 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A485 Steel Seamless tube, Grade 2 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A485 Steel Seamless tube, Grade 2 -:- For detailed product information, please contact sales. -:

Packing of ASTM A485 Steel Seamless tube, Grade 2 -:- For detailed product information, please contact sales. -: Standard Packing: -:- For detailed product information, please contact sales. -: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and Steel Seamless tube drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 867 gallon liquid totes Special package is available on request. E FORUs’ is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition