1.AISI 4140 Steel equivalent
| Country | China | Japan | Germany | USA | British |
| Standard | GB/T 3077 | JIS G4105 | DIN (W-Nr.) EN 10250 |
AISI/ASTM ASTM A29 |
BS 970 |
| Grade | 42CrMo | SCM440 | 42crmo4/1.7225 | 4140 | EN19/709M40 |
2. AISI 4140 steel chemical composition
| Grade | C | Si | Mn | P | S | Cr | Mo | Ni |
| 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 | - |
| 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 | - |
| 42crmo4/1.7225 | 0.38-0.45 | ≤ 0.4 | 0.6-0.9 | ≤0.025 | ≤0.035 | 0.9-1.2 | 0.15-0.30 | - |
| 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 | - |
| EN19/709M40 | 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.AISI 4140 steel mechanical properties(for guidance only)
| Grade | Tensile strength σb(MPa) |
Yield strength σs (MPa) |
Elongation δ5 (%) |
Reduction ψ (%) |
Impact Value Akv (J) |
Hardness |
| 4140 | ≥1080 | ≥930 | ≥12 | ≥45 | ≥63 | 28-32HRC |
4.AISI 4140 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 |
AISI 4140 steel finds many applications as forgings for the aerospace,oil and gas,automotive, agricultural and defense industries etc.
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1.What is steel round bar used for?
Tool steel bars come in various grades and sizes to meet manufacturing needs. They are used to manufacture dies, punches, moulds, and machine parts. Tool steel bars are also used in the automotive, aerospace & construction industries for making specialized tools and components.
2.What are the characteristics of alloy steel?
Examples include high hardness and strength, ductility, toughness, low corrosion, and resistance to wear and high temperatures, among many other things. In the main, these are steels alloyed with nickel, chromium, chromium-molybdenum, chromium-nickel and chromium-nickel-molybdenum.
3.What is the ASTM standard for round bars?
The ASTM A276 Round Bar is a specification which covers both hot-finished and cold-finished stainless steel products. They are generally sold in annealed conditions, but some of these grades can also be hardened with the process of heat treating.
4.What is the difference between a round bar and a rebar?
The first key difference to note is within the strength of the two bars. The rebar has a much higher tensile and maximum bending strength. Such properties make it the perfect material for fortifying concrete. In doing just that, the rebar can withhold its molecular integrity for well over 100 years.
5.What is 4140 round bar?
Alloy Steel Round Bar 4140 is a round shaped bar of oil-hardening, chromium-molybdenum 4140 steel. It has good strength and wear resistance, excellent toughness and ductility. 4140 Alloy steel can resist stress and creep at prolonged high temperatures (up to 1000°F).