Product Description
EN19 SCM440 4140 Hardened and Tempered Steel Round Bar
SAE 4140 Hot rolled Q&T steel round bars made in China
SAE 4140 Hot rolled Q&T steel round bars made in China
| GB,YB | JIS | DIN(W-Nr.) | ASTM | BS | NF |
| 42CrMo | SCM440/(SCM4) | 42CrMo4-1.7225 | 4140 | 708M40/709M40/708A42/EN19 | 42CD4 |
2.Chemical composition of 4140 steel
| Standard | Grade | C | Si | Mn | P | S | Cr | Mo |
| ASTM A29 | 4140 | 0.38-0.43 | 0.15-0.35 | 0.75-1.00 | ≤ 0.035 | ≤ 0.04 | 0.8-1.1 | 0.15-0.25 |
| 42CrMo4 | 0.38-0.45 | ≤ 0.4 | 0.6-0.90 | ≤ 0.025 | ≤ 0.035 | 0.9-1.2 | 0.15-0.30 | |
| EN10083 | 1.7225 | |||||||
| JIS G4105 | SCM440 | 0.38-0.43 | 0.15-0.35 | 0.6-0.85 | ≤ 0.035 | ≤ 0.04 | 0.9-1.2 | 0.15-0.30 |
| GB 3077 | 42CrMo | 0.38-0.45 | 0.17-0.37 | 0.5-0.80 | ≤ 0.035 | ≤ 0.035 | 0.9-1.2 | 0.15-0.25 |
| BS 970 | EN19 | 0.35-0.45 | 0.15-0.35 | 0.5-0.80 | ≤ 0.035 | ≤ 0.035 | 0.9-1.5 | 0.2-0.40 |
3.Heat treatment of 4140 scm440 en19
Forging
Can be heated to 1150°C and maintained until uniform
Minimum forging temperature 850°C
Can be cooled slowly in sand or ash
Stress Relieving
Hardened: Heat to 500°C - 550°C
Annealed: Heat to 600°C - 650°C
Cool in still air
Annealing
Heat to 830°C - 850°C
Furnace cool
Normalizing
Heat to 870°C - 900°C
Cool in still air
Nitriding
Heat to 500°C - 530°C and hold for sufficient time to develop the depth of case required
Parts should be pre-hardened and tempered as required and also pre-machined leaving a small grinding allowance only.
Tempering
Heat to 450°C - 700°C cool in still air
Tempering in the range of 200°C - 420°C causes temper brittleness and should be avoided
Flame and Induction Hardening
All materials consisting of de-carburized surfaces should be removed to ensure best results.
4.Applications
AISI 4140 is used extensively in most industry sectors for a wide range of applications such as:
Strippers bolts axle shafts
tool bodies bolsters holder blocks
stubs crankshafts tool holders
machinery parts and components mold bases couplings
connecting rods tie rods conveyor parts
ejectors reamer bodies chuck bodies
boring bars crow bars back up and support tooling
axles collets guides
logging parts fixtures piston rods
conveyor pins & rolls tracks shafts
jigs rams ejector pins
ways sprockets molds
hydraulic machinery shafts forks slides
studs cams gears
guide rods wear strips or parts pump shafts
drill collars sprockets torsion bars
forming dies ring gears gear racks
chain links lathe spindles brake dies
adapters valves spindles
logging parts trim dies arbors
milling spindles motor shafts pinch bars
pins pinions nuts
pump shafts tool holders sockets
5.Delivery condition and sizes:
16-310mm:Hot rolled / Hot rolled+QT
5-100mm:Cold Drawn / Cold Drawn+QT
20-150mm:Peeled / Peeled+QT
200-1000mm:Forged
6.Payment terms: T/T or L/ C
(1)30% paid by T/T and rest 70% by T/T upon the copy of B/B.
(2)100% irrevocable L/C at sight
7.Delivery time:within 7 -20 days after your deposit or L/C.
8. Mark: including steel material, heat No., pieces, weight, date and so on.
