High strength, hardenability, good toughness, small deformation during quenching, high creep strength and lasting strength at high temperature. It is used to manufacture forgings that require higher strength and larger quenched and tempered section than 35CrMo steel, such as large gears for locomotive traction, supercharger transmission gears, rear axles, connecting rods and spring clips that are heavily loaded, and can also be used for Drill pipe joints and fishing tools for oil wells below 2000m.
4140 Steel Grade Equivalent Chart
| Country |
USA |
Germany/UK/France |
JAPAN |
| Standard |
ASTM A29 / A29M-05 |
EN 10083/3-2006 |
JIS G4053-2008 |
| Grades |
4140 |
42CrMo4(1.7225) |
SCM440
|
1.7225 Steel Mechanical Properties
| Mechanical Properties |
Metric |
Imperial |
| Tensile strength |
655 MPa |
95000 psi |
| Yield strength |
415 MPa |
60200 psi |
| Bulk modulus(typical for steel) |
140 GPa |
20300 ksi |
| Shear modulus(typical for steel) |
80 GPa |
11600 ksi |
| Elastic modulus |
190-210 GPa |
27557-30458 ksi |
| Poisson’s ratio |
0.27-0.30 |
0.27-0.30 |
| Elongation at break(in 50 mm) |
25.70% |
25.70% |
| Hardness, Brinell |
197 |
197 |
| Hardness, Knoop(converted from Brinell hardness) |
219 |
219 |
| Hardness, Rockwell B(converted from Brinell hardness) |
92 |
92 |
| Hardness, Rockwell C(converted from Brinell hardness. Value below normal HRC range, for comparison purposes only) |
13 |
13 |
| Hardness, Vickers(converted from Brinell hardness) |
207 |
207 |
| Machinability(based on AISI 1212 as 100 machinability) |
65 |
65
|
AISI 4140 Steel Characteristics
1.It is low alloy steel with chromium, molybdenum, and manganese.
2.Great toughness, fatigue strength, abrasion and impact resistance.
3.It is widely be used in the industry due to its excellent versatility and usefulness.
4.The higher carbon content in it, the higher the strength and heat treatment capabilities it is.
5.It can be oil hardened to relatively high hardenability.
Test
How is SAE 4140 steel tested?
Our AISI 4140 steel round bar and steel plate composition detection is carried out by a spectrometer, which is fast, accurate and efficient in detection; hardness is tested by a hardness tester,
The hardness tester is based on the Leeb hardness measurement principle, which can easily and quickly measure a variety of metal materials. While displaying the hardness measurement value immediately, it can be freely converted between different hardness scales, and the tolerance limit can be set in advance, and it will automatically alarm when it exceeds the range.
1. Measuring range: (170-960)HLD,(17-68.5)HRC,(19-651)HB,(80-976)HV,(30-100)HS,(59-85)HRA(13-100 )HRB
2. Measurement direction: support 360° (vertical down, oblique down, horizontal, oblique up, vertical up)
3. Hardness scale: Richter (HL), Brinell (HB), Rockwell B (HRB), Rockwell C (HRC), Rockwell A (HRA), Vickers (HV), Shore (HS)
4. Display: quarter dot matrix LCD
5. Data storage: maximum 500 groups (impact times 32 to 1)
6. Working voltage: 3V (2 AA size alkaline batteries connected in series)
7. Continuous working time: about 100 hours (when the backlight is not turned on)
Our company Dongguan Songshun Mould Steel Co., Ltd. specializes in the production of alloy steel for more than 10 years, mainly producing various alloy steel products, if you need more price, cooperation or quality information, please notify us jacklu@songshunsteel.com
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