4340 Steel Chemical Composition
| Grade | C | Si | Mn | P | S | Cr | Mo | Ni |
| 4340 | 0.38-0.43 | 0.15-0.35 | 0.6-0.8 | 0.035 | 0.04 | 0.7-09 | 0.2-0.3 | 1.65-2.0 |
| 36CrNiMo4 | 0.32-0.4 | 0.4 | 0.5-0.8 | 0.035 | 0.035 | 0.9-1.2 | 0.15-0.3 | / |
| EN24 | 0.36-0.44 | 0.1-0.4 | 0.45-0.7 | 0.035 | 0.04 | 1.0-1.4 | 0.2-0.35 | 1.3-1.7 |
| SNCM439 | 0.36-0.43 | 0.15-0.35 | 0.6-0.9 | 0.03 | 0.03 | 0.6-1.0 | 0.15-0.3 | 1.6-2.0 |
4340 Steel Mechanical Properties
The mechanical properties mainly include tensile strength, yield strength, elongation, area or reduction, hardness, impact value, non-metalic inclusion etc. Different heat treatment, the mechanical properties will be different, such as normalized, tempered, QT. If you want to know the properties, kindly contact the salesman.
4340 Steel Overviews
| Size | Round | Dia 6-1200mm |
| Plate/Flat/Block | Thickness 6mm-500mm |
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| Width 20mm-1000mm |
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| Heat treatment | Normalized ; Annealed ; Quenched ; Tempered | |
| Surface condition | Black; Peeled; Polished; Machined; Grinded; Turned; Milled | |
| Delivery condition | Forged; Hot rolled; Cold drawn | |
| Test | Tensile strength, Yield strength, elongation, area of reduction, impact value, hardness, grain size, ultrasonic test, US inspection, magnetic particle testing, etc. | |
| Payment terms | T/T;L/C;/Money gram/ Paypal | |
| Trade terms | FOB; CIF; C&F; etc.. | |
| Delivery time | 30-45 days | |
| Application | 4340 alloy steels are used for aircraft landing gear, automotive, oil and gas drilling, warm and cold forming, machine building, transfer systems like power transmission gears and shafts, general engineering industries and structural use applicatios such as heavy duty shafts, gears, axles, spindles, couplings, pins, chucks, molds and so on. | |
1. What is 4340 steel good for?
It is a versatile material that can help create everything from automobiles, bridges, and skyscrapers to kitchen appliances, office furniture, and tools. 4340 steel is a type of steel used in many different industries, such as automotive, construction, aerospace, and more.
2.Is 4340 steel better than 4140?
As 4340, on average, has more hardness and toughness than 4140, it can be more challenging to machine. If you're making similar parts machined to tight tolerances, 4140 may be the better choice.
3.Is 4340 hard to machine?
4340 carbon steel has a machinability rating of 55% in the annealed condition.
4.When would you choose 4340 over 4140 steel?
4140 Steel is a versatile, cost-effective choice for general high-strength applications, while 4340 Steel excels in extreme conditions demanding unparalleled toughness and fatigue resistance.
5.What is the difference between 1018 and 4340 steel?
4340 steel has a higher carbon content, which gives it a greater hardness and strength than 1018 steel. It also has a high nickel level, making it resistant to corrosion and oxidation. One of the most significant advantages of 4340 steel is its ability to be heat-treated to enhance its properties.