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8620 Hot Rolled Steel Bar Supplier
8620 alloy structural steel bar is a type of low-alloy high-strength steel, belonging to the Ni-Cr-Mo series alloy steel. It exhibits excellent hardenability, weldability, and machinability. After appropriate heat treatment (such as carburizing, quenching and tempering), it can achieve a balance of high hardness, high wear resistance, and good toughness. It is widely used in machinery manufacturing, automotive industry, and other fields with strict requirements on material performance.
Chemical Composition (Mass Fraction, %)
| Element | Content Range |
|---|---|
| C (Carbon) | 0.18-0.23 |
| Si (Silicon) | 0.15-0.35 |
| Mn (Manganese) | 0.70-0.90 |
| P (Phosphorus) | ≤0.035 |
| S (Sulfur) | ≤0.035 |
| Ni (Nickel) | 0.40-0.70 |
| Cr (Chromium) | 0.40-0.60 |
| Mo (Molybdenum) | 0.15-0.25 |
| Cu (Copper) | ≤0.30 |
Functions of Core Elements:
Carbon (C): Enhances the strength and hardness of the steel, providing a foundation for heat treatment strengthening.
Nickel (Ni): Improves toughness, ductility, and low-temperature performance, and enhances impact resistance.
Chromium (Cr): Increases hardenability, wear resistance, and corrosion resistance, and optimizes surface hardness.
Molybdenum (Mo): Refines grain size, improves high-temperature strength and temper resistance, and reduces temper brittleness.
Forged steel bar
Basic Physical Properties
Density: 7.85 g/cm³ (at room temperature)
Melting Point: 1420-1460℃
Thermal Conductivity: 42 W/(m·K) (at 20℃)
Specific Heat Capacity: 460 J/(kg·K) (at 20℃)
Coefficient of Linear Expansion: 11.7×10⁻⁶/℃ (20-100℃)
Mechanical Properties (Annealed State, Hardness ≤197 HB)
Tensile Strength: ≥640 MPa
Yield Strength: ≥370 MPa
Elongation (δ5): ≥18%
Reduction of Area (ψ): ≥40%
Impact Energy (Akv, 20℃): ≥63 J
Heat Treatment Characteristics
Carburizing Temperature: 900-950℃
Quenching Temperature: 840-860℃ (oil cooling)
Tempering Temperature: 150-200℃ (low-temperature tempering to maintain high hardness)
Surface Hardness after Carburizing: ≥58 HRC; Core Hardness: 30-45 HRC
Stock 8620 steel bar
Our Service:
We control the quality of every detail and provide you with quality service.
1: Strict selection of high-quality steel raw materials that meet the standards, and upper materials forging upper products.
2: Strictly control the production of steel products during the forging and casting process. Don't take small things for granted, and achieve true quality control.
3: Strictly control each link of product sampling test, keep improving, and select quality.
4: In strict accordance with international standards
We warmly welcome our regular and new clients to join us for 4140, 4130, 4135, 4150, 8620, 5140 Alloy Steel Round Bar. We always pursue the quality policy of 'zero defect', continuously optimize the product structure, pay attention to standardization, scientific and modern management and win the trust of users with high service. Serving you and satisfying you are our unswerving work goals. Trust us, believe in your choice, we will do our best for you.