Carbon Steel 20Mncr5 Round Bars
20MnCr5 round bar is an alloy structural steel, carburized steel, with high strength, toughness and good hardenability. The properties obtained after heat treatment are better than 20Cr. The quenching deformation is small, the low temperature toughness is good, and the cutting processability is good; but the welding performance is low. Generally used after carburizing, quenching or tempering. It is used to manufacture and heavy-load large-section quenched and tempered parts and small-section carburized parts. It can also be used to manufacture small and medium-sized parts with medium load and small impact, replacing 20CrNi, such as gears, shafts, spindles, and friction wheels of transmission equipment. , worm, governor sleeve, etc.
20MnCr5 round steel chemical composition
| Grade | C | Si | Mn | P | S | Cr |
| 20MnCr5 | 0.17-0.22 | ≤ 0.4 | 1.1-1.4 | ≤ 0.025 | ≤ 0.035 | 1.0-1.3 |
20MnCr5 steel round bar equivalent grade
| China/GB 3077 | USA/ASTM A29 | Japan/JIS G4053 | France/AFNOR NF A 35-551 | Germany/DIN 17210 |
| 20CrMn | 5120 | SMnC420 | 20MC5 | 20MnCr5 |
20MnCr5 steel rounds heat treatment
| Normalizing,°C | Annealing,°C | Carburizing,°C | Core Hardening,°C | Case Hardening,°C | Tempering,°C |
| 880-920 | 840-860 | 880-980 | 860-900 | 780-820 | 150-200 |
20MnCr5 round stock steel
Annealed Condition:
| Tensile Strength,Mpa | Yield Strength,Mpa | Elongation,% | Charpy Impact, J | Brinell Hardness,HB |
| 500-650 | ≥ 300 | ≥ 20 | ≥ 50 | ≤187 |
Quenched and Tempered Condition:
| Tensile Strength,Mpa | Yield Strength,Mpa | Elongation,% | Reduction of Area,% | Charpy Impact, J |
| ≥930 | ≥735 | ≥10 | ≥45 | ≥47 |
Hardenability Limits:
| Distance from quenched end mm | 1.5 | 3 | 5 | 7 | 9 | 11 | 13 | 15 | 20 | 25 | 30 | 35 | 40 |
| HRC Min | 41 | 39 | 36 | 33 | 30 | 28 | 26 | 25 | 23 | 21 | – | – | – |
| HRC Max | 49 | 49 | 48 | 46 | 43 | 42 | 41 | 39 | 37 | 35 | 34 | 33 | 32 |
20MnCr5 round bar stock hardness requirements for delivery conditions
| Conditions | 20MnCr5 | 16MnCr5 |
| Treated to improve shearability(+S) | ≤255HBW | - |
| Soft annealed(+A) | ≤217HBW | ≤207HBW |
| Treated to Hardness range(+TH) | 170-217HBW | 156-207HBW |
| Treated to ferrite-pearlite structure and hardness range(+FP) | 152-201HBW | 140-187HBW |
| Normalized(+N) | 140-201HBW | 138-187HBW |
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