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Polished Surface SAE 8620 Alloy Steel Round Bar with High Hardenability and Good Weldability
Product Details
| Diameter | OD 6-630mm | Material Composition | Alloy |
|---|---|---|---|
| Surface Treatment | Polished | Carbon Content | 0.17-0.23% |
| Silicon Content | 0.17-0.37% | Manganese Content | 0.6-0.95% |
| Chromium Content | 0.4-0.7% | Molybdenum Content | 0.20-0.30% |
| Tensile Strength | ≥980 MPa | Yield Strength | ≥785 MPa |
| Elongation | ≥9% | Reduction Area | ≥40% |
| Impact Energy | ≥47 J | Density | 7.86 G/cm3 |
| Modulus Elasticity | 210 X 103 N/mm2 | ||
| Highlight | Polished Surface Alloy Steel Round Bar,High Hardenability SAE 8620 Round Bar,Good Weldability 20NiCrMo2 Steel Bar |
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Product Description
AISI 8620 1.6523 Alloy Steel Round Bar
SAE 8620H Alloy Round Bar | UNS G86200 Bar | 20NiCrMo2-2 Sncm220
SAE 8620 is an alloy construction steel with excellent hardenability, good weldability,
and superior machinability. This low carbon nickel chromium molybdenum alloy offers
outstanding carburized properties, formability, and weldability, making it the most
widely used carburizing alloy in industrial applications.
Key Features
- Excellent machinability performance
- Superior cold strain plasticity
- Good weldability characteristics
- High hardenability without post-tempering fragility
International Standards Equivalents
| Brand Name | Ravne No. | Mat. No. | DIN | EN | AISI |
|---|---|---|---|---|---|
| 20NCD2 | 769 | 1.6523 | 21NiCrMo2 | 20NiCrMo2 | 8620 |
Chemical Composition (Weight %)
| C | Si | Mn | Cr | Mo | Ni | V | W | Others |
|---|---|---|---|---|---|---|---|---|
| 0.20 | max. 0.40 | 0.80 | 0.53 | 0.20 | 0.55 | - | - | - |
Detailed 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
Quenching Temperature: 850°C (Oil cooled)
Tempering: 200°C (Air cooled)
Tempering: 200°C (Air cooled)
| Property | Value |
|---|---|
| Tensile Strength σb (MPa) | ≥980(100) |
| Yield Strength σs (MPa) | ≥785(80) |
| Elongation δ5 (%) | ≥9 |
| Reduction of Area ψ (%) | ≥40 |
| Akv (J) | ≥47 |
Physical Properties
Modulus of Elasticity: 210 × 10³ N/mm²
Density: 7.86 g/cm³
Density: 7.86 g/cm³
Heat Treatment Specifications
Soft Annealing
Heat to 650-700°C, cool slowly. Maximum Brinell hardness: 212
Heat Treatment Processes
| 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.
Post-heat treatment machining is minimized to preserve the hardened case,
typically limited to grinding operations.
Welding
Suitable for conventional gas or arc welding methods. Preheating at 200°C is recommended,
followed by post-weld heat treatment according to approved procedures.
Cold Working
Cold working is performed in the annealed condition using conventional methods,
completed to close tolerances before heat treatment or carburizing.
Applications
This alloy is widely used in transmission systems, tractor motors, and automotive components.
Ideal for high-class carburization and cyanide carburizing parts including:
- Gears and pinions
- Shafts and bearings
- Piston rings and ring gears
- Crankshafts
- Oil drilling components
- Mining claws and cones
Available Sizes and Conditions
Round Bar Diameter: 12-380mm
Available Forms: Round bars, flat bars, plates, blocks
Conditions: Pre-hardened, hot rolled, annealed, quenched and tempered
Surface Conditions: Black, pre-machined, grinding, polish
Available Forms: Round bars, flat bars, plates, blocks
Conditions: Pre-hardened, hot rolled, annealed, quenched and tempered
Surface Conditions: Black, pre-machined, grinding, polish
Quality Assurance
We source materials exclusively from certified steel manufacturers to ensure consistent
quality and performance. Our quality management system is certified in accordance with
ISO 9001, with regular audits and recertification to maintain the highest standards.
Our Services
- Quality special steel for all industries
- Orders of any size and length with fast shipping
- Unique inventory of specialty steel
- Value-added services: metal cutting, sizing, machining, heat treatment
- Sawing services for small or large quantities
- Excellent customer service and support
Product Images
Note: The information presented represents typical or average values and is not a guarantee
of maximum or minimum values. Applications suggested are for illustration purposes only.
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