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SAE 8620 Chemical Composition
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The image below shows the chemical composition of SAE 8620 steel, a widely used alloy steel in various industrial applications.
### Table of Contents:
1. **SAE 8620 Chemical Composition**
2. **AISI 8620 Steel Mechanical Properties**
3. **Equivalent Grades and Standards of Alloy 8620**
4. **UNS G86200 Material Hardness**
5. **Forging Temperature of DIN 1.6523**
6. **21NiCrMo2 Grade Thermal Properties**
7. **SNCM220 Pre-Heat Temperature**
8. **Physical Properties of 8620 Grade Steel**
9. **SAE 8620 Steel Quality Classification**
10. **AISI 8620 Normalizing & Annealing**
11. **SAE 8620 Carburizing**
12. **Difference Between SAE 8620 Steel Mechanical Properties in Normalized & Annealed Conditions**
13. **Surface Finish of AISI 8620 Steel**
14. **Alloy Steel 8620 Bar Sizes and Tolerance**
15. **EN362 Steel Hot Forming and Heat Treatment**
16. **SAE 8620 Material Case Hardening Methods**
17. **AISI 8620 Bar Mechanical Properties for Core – Carburised and Oil Quenched at 840°C**
18. **8620 Hot Rolled Steel Working Temperature Range**
19. **Stress Relieving of Low Alloy Steel 8620**
20. **SAE 8620 Machinability**
21. **8620 Steel Testing and Inspection**
22. **AISI 8620 vs. 4140 Steel**
### SAE 8620 Chemical Composition:
SAE 8620 steel contains several key elements that contribute to its excellent mechanical properties. The composition ranges include:
- **Manganese**: 0.7-0.9%
- **Nickel**: 0.4-0.7%
- **Chromium**: 0.4-0.6%
- **Silicon**: 0.15-0.35%
- **Carbon**: 0.18-0.23%
- **Molybdenum**: 0.15-0.25%
- **Sulfur**: 0-0.04%
- **Phosphorus**: 0-0.035%
- **Iron**: 96.9-98%
### AISI 8620 Steel Mechanical Properties:
| Property | Annealing (°C) | Normalizing (°C) |
|-----------------------|----------------|------------------|
| Temperature | 820-850 | 880-920 |
| Cooling Speed | Slow | Relatively Fast |
| Cooling | Furnace Cooling| Air Cooling |
| Grain Size | Normal | Good |
### Equivalent Grades and Standards of Alloy 8620:
| Country | BS Standard | DIN Standard | USA Standard | Japan Standard |
|------------|-------------------|------------------|--------------|----------------|
| Grade | 805M20 | 1.6523/21NiCrMo2 | 8620 | SNCM220 |
### UNS G86200 Material Hardness:
- **Knoop Hardness**: 169
- **Rockwell B**: 80
- **Vickers Hardness**: 155
### Forging Temperature of DIN 1.6523:
- **Forging Temperature**: 2250°F (1230°C)
### 21NiCrMo2 Grade Thermal Properties:
| Property | Imperial | Metric |
|-------------------------|------------------|-------------------|
| Thermal Conductivity | 323 BTU in/hr.ft².°F | 46.6 W/mK |
### SNCM220 Pre-Heat Temperature:
| Section Size | 40mm | 50mm | 75mm | 150mm |
|--------------|------|------|------|-------|
| oC | 25 | 40 | 100 | 150 |
### Physical Properties of 8620 Grade Steel:
| Property | Value |
|---------------------------|----------------|
| Density (g/cm³) | 7.85 |
| Melting Point (°F) | 2600 |
| Poisson’s Ratio | 0.27-0.30 |
| Thermal Expansion (20°C) | 12.2×10â»â¶ |
| Specific Heat Capacity | 477 J/(kg·K) |
| Thermal Conductivity | 46.6 W/(m·K) |
| Electric Resistivity | 2.34×10â»â· Ω·m |
### SAE 8620 Steel Quality Classification:
| Quality Type | Central Porosity | General Porosity | General Spot Segregation | Pattern Segregation |
|------------------------|------------------|------------------|--------------------------|---------------------|
| Quality Steel | ≤3.0 | ≤3.0 | ≤1.0 | ≤3.0 |
| High-Quality Steel | ≤2.0 | ≤2.0 | Not Allowed | ≤2.0 |
| Premium-Quality Steel | ≤1.0 | ≤1.0 | Not Allowed | ≤1.0 |
### AISI 8620 Normalizing & Annealing:
| Property | Annealing (°C) | Normalizing (°C) |
|--------------------------|----------------|------------------|
| Grain Size | Normal | Good |
| Surface Hardness (HBW) | 150-187 | 183-200 |
### SAE 8620 Carburizing:
| Property | Value |
|--------------------------|----------------|
| Carburizing Temp. (°C) | 900-920 |
| Quenching Temp. (°C) | 780-800 |
| Tempering Temp. (°C) | 150-170 |
| Surface Hardness (HRC) | 59-63 |
| Core Hardness (HRC) | >30 |
| Effective Case Depth | 1.4-1.8 mm |
### Difference Between SAE 8620 Steel Mechanical Properties in Normalized & Annealed Condition:
| Property | Annealed Yield Strength (MPa) | Normalized Yield Strength (MPa) |
|--------------------------|-------------------------------|---------------------------------|
| Yield Strength | 385 | 355 |
| Tensile Strength | 535 | 635 |
| Elongation (%) | 31.3 | 26.3 |
### Surface Finish of AISI 8620 Steel:
- **Black Finish**
- **Rough Turned Finish**
- **Peel Finish**
### Alloy Steel 8620 Bar Sizes and Tolerance:
| Form | Size (mm) | Manufacturing Process | Tolerance Range |
|-------------|-----------------|-----------------------|-----------------|
| Flat/Square | Thickness: 120-800 | Hot Forged | -0/+8mm |
### EN362 Steel Hot Forming and Heat Treatment:
| Treatment | Temperature Range (°C) | Cooling Method |
|--------------------------|------------------------|------------------------|
| Carburizing | 880-960 | Oil/Water Quench |
| Case Hardening | 780-820 | Oil/Water Quench |
| Core Hardening | 860-900 | Oil/Water Quench |
| Intermediate Annealing | 630-650 | Air/Furnace Cooling |
| Tempering | 150-200 | Air Cooling |
### SAE 8620 Material Case Hardening Methods:
- Flame or Induction Hardening
- Carburizing
- Nitriding
- Carbonitriding
### AISI 8620 Bar Mechanical Properties for Core – Carburised and Oil Quenched at 840°C:
| Property | Section Size (mm) | Min Value (MPa) | Max Value (MPa) |
|-------------------------|-------------------|-----------------|-----------------|
| Tensile Strength | 11 mm | 980 | 1270 |
### 8620 Hot Rolled Steel Working Temperature Range:
- **Up to 650°F (343°C)**
### Stress Relieving of Low Alloy Steel 8620:
- **Temperature Range**: 630°C – 650°C
### SAE 8620 Machinability:
- **Machinability Rating**: 66%
### 8620 Steel Testing and Inspection:
- Chemical Analysis
- Surface Hardness
- Ultrasonic Test Report
- Heat Treatment Process
- Grain Size
- Forging Ratio
- Mechanical Properties
- Non-Metallic Inclusions
### AISI 8620 vs. 4140 Steel:
| Property | SAE 8620 | AISI 4140 |
|--------------------------|------------------|------------------|
| Carbon Content | 0.18%-0.23% | 0.38%-0.43% |
| Hardness | 25 HRC | 18-22 HRC |
This comprehensive guide provides detailed insights into the properties and applications of SAE 8620 steel, making it a valuable resource for engineers and manufacturers alike.
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