EN19
709M40
(En19)
Applications
Its typical uses are axle shafts, crankshafts, connecting rods, gears, high tensile bolts and studs, propeller shafts joints, rifle barrels and breech mechanisms for small arms parts, introduction hardened trackpins.
|
Forgeability |
Good |
|
Heat Treatment Ability |
Very Versatile |
|
Machineability |
Difficult |
|
Weldability |
Not recommended |
Chemical Composition
| Element | Min | Max |
| Carbon | 0.36 | 0.44 |
| Silicon | 0.10 | 0.35 |
| Manganese | 0.70 | 1.00 |
| Phosphorous | - | 0.04 |
| Sulphur | - | 0.04 |
| Chromium | 0.90 | 1.20 |
| Molybdenum | 0.25 | 0.35 |
Mechanical Properties
| Condition | |||||
| R | S | T | U | V | |
| Limited Ruling Section, mm | 254 | 152 | 102 | 64 | 29 |
| Tensile Strength, MPa min. | 690/850 | 770/930 | 850/1000 | 930/1080 | 1000/1160 |
| Yield Stress; MPa min. | 480 | 570 | 665 | 740 | 835 |
| Elongation, % min. | 15 | 15 | 13 | 12 | 12 |
| Izod Impact Value; Joule | 34 | 54 | 54 | 47.5 | 47.5 |
| Brinnel Hardness Number | 201/255 | 223/277 | 248/302 | 269/331 | 293/352 |
Foreign Equivalent Specifications
| Standard German Mat. No. | Din | SAE | AISI | JIS |
|
1.7225 |
GS-42rM04 | 4140H | 4140H | G4042
Type: SCM4H |
Stock Size Range
(Round Black Bar)
| 20 | 2.466 kg/m | 80 | 39.458 kg/m |
| 25 | 3.853 kg/m | 85 | 44.545 kg/m |
| 30 | 5.549 kg/m | 90 | 49.939 kg/m |
| 35 | 7.553 kg/m | 95 | 55.642 kg/m |
| 40 | 9.865 kg/m | 100 | 61.654 kg/m |
| 45 | 12.485 kg/m | 110 | 74.536 kg/m |
| 50 | 15.413 kg/m | 115 | 81.537 kg/m |
| 55 | 18.650 kg/m | 120 | 88.781 kg/m |
| 60 | 22.195 kg/m | 130 | 104.195 kg/m |
| 65 | 26.049 kg/m | 140 | 120.841 kg/m |
| 70 | 30.210 kg/m | 150 | 138.721 kg/m |
| 75 | 34.680 kg/m | 160 | 157.833 kg/m |
Larger sizes and forgings are also available and please
remember to allow for surface removal of + 6% to ensure cleanup.
