SAE8620H 20CrNiMo Alloy Steel Round Bar
SAE8620H Alloy Solid Round Bar | UNS G86200 Bar
SAE 8620 is an alloy construction steel according to Chinese Standard (Code: A50202). This steel round bar offers high hardenability, maintains toughness after tempering, provides good weldability, and features excellent machinability and cold strain plasticity.
Product Features
Excellent machinability performance
Superior cold strain plasticity
Good weldability characteristics
High hardenability properties
Material Specifications
International Standards Equivalents
| Designation |
Brand Name |
Ravne No. |
Mat. No. |
DIN |
EN |
AISI |
| 20NCD2 |
769 |
1.6523 |
21NiCrMo2 |
20NiCrMo2 |
8620 |
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 Chemical 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)
| 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
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 |
| Carburizing |
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. Conventional machining methods are suitable prior to heat treatment.
Welding
Conventional gas or arc welding methods are suitable. Preheating at 200°C is beneficial, with subsequent heating recommended after welding.
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 small-to-medium automotive applications. Suitable for high-class carburization and cyanide carburizing parts including oil drilling equipment, mining claws, and cones.
Common applications include carburized gears, pinions, shafts, bearings, piston rings, ring gears, crankshafts, and other components requiring hard carburized cases with tough cores.
Available Sizes
Round Bar Diameter: 12-380mm
Material Conditions & Forms
Available in various conditions: pre-hardened, hot rolled, annealed, quenched and tempered. Surface conditions include black, pre-machined, grinding, and polished finishes. Forms include round bars, flat bars, plates, and blocks.
Quality Assurance
Materials sourced exclusively from government-owned steel mills to ensure consistent quality and reliability.
ISO 9001 certified quality management system with regular audits and recertification.
Competitive pricing combined with superior product quality.
Our Services
Speedy and timely delivery with shortest lead times
Unique inventory of specialty steel products
Value-added services: metal cutting, sizing, machining, heat treatment
Sawing services for small or large quantities
Excellent customer service and support
Orders of any size and length accommodated
The information presented represents typical or average values and is not a guarantee of maximum or minimum specifications. Applications suggested are for illustration purposes only.
