8620/1.6523/20CrNiMoA/SNCM220 alloy steel
8620 carbon steel can also be used as high tensile steel (uncarburized), which can be used for a variety of applications needing great tensile strength and adequate toughness when properly hardened and tempered. It’s known to have good internal strength, but the strength on the outside is even greater.
Composição química (%)
| Padrão | Grau | C | Si | Mn | P | S | Cr | Ni |
| ASTM A29 | 8620 | 0.18-0.23 | 0.15-0.35 | 0.7-0.9 | ≤ 0.035 | ≤ 0.04 | 0.4-0.6 | 0.4-0.7 |
| EN 10084 | 1.6523 | 0.17-0.23 | ≤ 0.04 | 0.65-0.95 | ≤ 0.025 | ≤ 0.035 | 0.35-0.70 | 0.4-0.7 |
| 20NiCrMo2-2 |
| JIS G4103 | SNCM220 | 0.17-0.23 | 0.15-0.35 | 0.6-0.9 | ≤ 0.03 | ≤ 0.03 | 0.4-0.65 | 0.4-0.7 |
| BS 970 | 805M20 | 0.17-0.23 | 0.1-0.4 | 0.6-0.95 | ≤ 0.04 | ≤ 0.05 | 0.35-0.65 | 0.35-0.75 |
| GB 3077 | 20CrNiMoA | 0.17-0.23 | 0.17-0.37 | 0.6-0.95 | ≤ 0.035 | ≤ 0.035 | 0.4-0.7 | 0.35-0.75 |
Aplicação
SAE 8620 is suited for applications which require a combination of toughness and wear resistance. it is commonly used in the engineering and automitive industries for toolholders and other such components.Typical application:Arbors, pinions, bushes, camshafts, kingpins,ratchets, gears, splined shafts etc.
Propriedade mecânica
| Section Size | 11 mm | 30 mm | 63 mm |
| Tensile Strength Mpa | 980-1270 | 780-1080 | 690-930 |
| Yield Strength Mpa | ≥785 | ≥590 | ≥490 |
| Elongation % | ≥9 | ≥10 | ≥11 |
| Impact Charpy J | ≥41 | ≥41 | ≥41 |
| Hardness HB | 290-375 | 235-320 | 205-275 |
| Hardness HRC | 31-41 | 23-35 | 16-29 |
Condições de tratamento térmico
| Forjamento | 925℃-1230℃. |
| Normalização | 900℃-925℃. |
| Annealing | 820℃-850℃. |
| Case Hardening | 780oC – 820oC. |
| Têmpera | 150oC - 200oC . |
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