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Polished Surface SAE 8620 Alloy Steel Round Bar with High Hardenability and Good Weldability
Product Details
| Model NO. | 8620 | Surface Treatment | Polished |
|---|---|---|---|
| Specification | OD 6-630mm | Production Capacity | 500tons |
| Chemical Composition C | 0.20 | Chemical Composition Si | Max. 0.40 |
| Chemical Composition Mn | 0.80 | Chemical Composition Cr | 0.53 |
| Chemical Composition Mo | 0.20 | Chemical Composition Ni | 0.55 |
| Modulus Of Elasticity | 210 X 10^3 N/mm2 | Density | 7.86 G/cm3 |
| Tensile Strength | ≥980 MPa | Yield Strength | ≥785 MPa |
| Elongation | ≥9% | ||
| Highlight | Polished Surface Alloy Steel Round Bar,High Hardenability SAE 8620 Steel Bar,Good Weldability 8620 Alloy Steel Rod |
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Product Description
SAE 8620H Alloy Steel Round Bar
SAE 8620 is an alloy construction steel known for its excellent hardenability, good weldability, and superior machinability. This low carbon nickel chromium molybdenum alloy offers outstanding carburized properties and formability, making it the most widely used carburizing alloy in various industries.
Key Features
- Excellent machinability performance
- Superior cold strain plasticity
- Good weldability characteristics
- High hardenability without fragility after tempering
International Standards
| Designation | Brand Name | Ravne No. | Mat. No. | DIN | EN | AISI |
|---|---|---|---|---|---|---|
| 20NCD2 | 769 | 1.6523 | 21NiCrMo2 | 20NiCrMo2 | 8620 | 8620 |
Chemical Composition
Standard Composition (weight %)
| C | Si | Mn | Cr | Mo | Ni | V | W | Others |
|---|---|---|---|---|---|---|---|---|
| 0.20 | max. 0.40 | 0.80 | 0.53 | 0.20 | 0.55 | - | - | - |
Chinese Standard 20CrNiMo Composition
| Grades | C | Si | Mn | P | S | Cr | Mo | Cu | Ni |
|---|---|---|---|---|---|---|---|---|---|
| 20CrNiMo | 0.17-0.23 | 0.17-0.37 | 0.6-0.95 | ≤0.035 | ≤0.035 | 0.4-0.7 | 0.20-0.30 | ≤0.30 | / |
Mechanical Properties
Heat Treatment: Quenching at 850°C (oil), Tempering at 200°C (air)
| Property | Value |
|---|---|
| Tensile Strength σb (MPa) | ≥980 (100) |
| Yield Strength σs (MPa) | ≥785 (80) |
| Elongation δ5 (%) | ≥9 |
| Reduction of Area ψ (%) | ≥40 |
| Impact Energy Akv (J) | ≥47 |
Physical Properties
| Property | Value |
|---|---|
| Modulus of Elasticity [10³ x N/mm²] | 210 |
| Density [g/cm³] | 7.86 |
Heat Treatment Guidelines
| Treatment | Temperature | Cooling |
|---|---|---|
| Case Hardening | 880-980°C | Oil (water), hot bath 160-250°C |
| Carburising | 880-980°C | Oil (water), hot bath 160-250°C |
| Direct Hardening | 880-980°C | Oil, hot bath 160-250°C |
| Core Refining | 860-900°C | Oil, hot bath 160-250°C |
| Core Refining | 780-820°C | Oil, hot bath 160-250°C |
| Tempering | 150-200°C | Air |
Hardenability Data
| Distance From Quenched End (mm) | 1.5 | 3 | 5 | 7 | 9 | 11 | 13 | 15 | 20 | 25 | 30 | 35 | 40 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| H max. | 49 | 48 | 45 | 42 | 36 | 33 | 31 | 30 | 27 | 25 | 24 | 24 | 23 |
| H min. | 41 | 37 | 31 | 25 | 22 | 20 | - | - | - | - | - | - | - |
Manufacturing Processes
Forging
Hot forming temperature: 1150-850°C
Machinability
Machining is performed prior to carburizing to achieve close tolerances. After heat treatment, finish machining is minimized to preserve the hardened case, typically limited to grinding operations.
Welding
Suitable for conventional welding methods (gas or arc). Preheating at 200°C is recommended, followed by post-weld heating according to approved procedures.
Cold Working
Cold working is performed in the annealed condition using conventional methods, completed to close tolerances before heat treatment.
Applications
Widely used in transmission systems, tractor motors, and automotive components. Ideal for carburized gears, pinions, shafts, bearings, piston rings, ring gears, crankshafts, and other applications requiring hard carburized cases with tough cores.
Available Stock Sizes
| Product Form | Diameter Range |
|---|---|
| Round Bar | 12-380mm |
Material Conditions & Forms
Available in various forms including round bars, flat bars, plates, and blocks. Conditions range from pre-hardened, hot rolled, annealed, quenched and tempered to surface finishes including black, pre-machined, grinding, and polished.
Quality Assurance
Government Certified Quality: All materials sourced directly from certified steel manufacturers to ensure consistent quality and performance.
Our Services
- Quality special steel for all industrial applications
- Flexible order quantities with fast shipping
- Comprehensive inventory of specialty steels
- Value-added services: metal cutting, sizing, machining, heat treatment
- Sawing services for small or large quantities
- Excellent customer service and support
Product Images
The information presented represents typical or average values and is not a guarantee of maximum or minimum specifications. Applications suggested are for illustrative purposes only. Continuous improvement of our quality management system is certified in accordance with ISO 9001 standards.
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