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SAE8640 Alloy Steel Round Bar with Polished Surface and High Hardenability for Tool and Mold Applications
Product Details
| Model NO. | 8640 | Surface Treatment | Polished |
|---|---|---|---|
| Alloy Type | Alloy | Diameter Range | OD 6-630mm |
| Production Capacity | 500tons | Carbon Content | 0.17-0.23 |
| Silicon Content | 0.17-0.37 | Manganese Content | 0.6-0.95 |
| Phosphorus Content | ≤0.035 | Sulfur Content | ≤0.035 |
| Chromium Content | 0.4-0.7 | Molybdenum Content | 0.20-0.30 |
| Tensile Strength | ≥980(100) MPa | Yield Strength | ≥785(80) MPa |
| Elongation | ≥9% | ||
| Highlight | SAE8640 Steel Round Bar,Polished Surface Alloy Steel Bar,High Hardenability SAE8640 Steel Bar |
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Product Description
SAE8640 Forging Steel Bar - Alloy Steel Round Bar
SAE 8620H Alloy Round Bar is a low carbon nickel chromium molybdenum alloy steel with excellent carburized properties, formability, and weldability. This widely used carburizing alloy offers high strength case and core toughness due to its nickel content, while chromium and molybdenum provide superior surface hardness and wear resistance.
Key Features
- Excellent machinability performance
- Superior cold strain plasticity
- Good weldability characteristics
- High hardenability properties
International Standards Equivalents
| Chinese (GB) | American (AISI) | German (DIN) | Japanese (JIS) |
|---|---|---|---|
| 20CrNiMo | SAE8620 | 1.6523 | / |
Chemical Composition
| Grade | 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
| Property | Value |
|---|---|
| Quenching Temperature | 850°C (oil cooled) |
| Tempering | 200°C (air cooled) |
| Tensile Strength σb (MPa) | ≥980(100) |
| Yield Strength σs (MPa) | ≥785(80) |
| Elongation δ5 (%) | ≥9 |
| Reduction of Area ψ (%) | ≥40 |
| Akv (J) | ≥47 |
Typical Applications
Widely used in transmission systems, tractor motors, and small to medium automotive components. Serves as an alternative to 12CrNi3 for high-class carburization and cyanide carburizing parts including oil drilling equipment, mining claws, and cones. Commonly applied in carburized gears, pinions, shafts, bearings, piston rings, ring gears, and crankshafts.
Available Stock Sizes
Round Bar Diameter: 12-380mm
Material Conditions & Forms
Our steel materials are 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 such as black, pre-machined, grinding, and polished.
Quality Assurance & Commitment
Government-Certified Quality
We source materials exclusively from certified steel manufacturers to ensure consistent, high-quality steel products. Our ISO 9001 certified quality management system undergoes regular audits and recertification.
Reliable Delivery
We prioritize timely delivery for all orders, whether raw materials or finished products with machining or heat treatment, ensuring shortest possible lead times.
Comprehensive Services
We provide specialty steel for all industries with value-added services including metal cutting, sizing, machining (blanking, milling, grinding), heat treatment, and sawing for any quantity requirements.
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