Alloy 4140 (AISI 4140) is one of the most popular direct hardening Cr-Mo alloy steel plates that have the ability to develop an extensive range of hardness and strength. Alloying elements and thermal treatments, such as quenching and tempering, greatly influence the hardness and strength of the steel.
Alloy 4140 plate is widely used for general purpose industrial machining. Welding and forming of this steel plate should be avoided. It is best utilized wherever high resistance to fatigue and or impact is necessary.
Worldwide equivalents of grade 4140 (USA: AISI, ASTM, UNS)
| Steel : 4140 | USA | Standard : ASTM A29/A29M |
Cross reference table
for Steel 4140 ( AISI, ASTM, UNS) and its European equivalent 42CrMoS4 (1.7227) ( EN )
| EU EN |
USA - |
Germany DIN,WNr |
France AFNOR |
Italy UNI |
Spain UNE |
Inter ISO |
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| 42CrMoS4 (1.7227) |
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European equivalent grade for Alloy special steel 4140 ( AISI, ASTM, UNS): 42CrMoS4 (1.7227)
Cross reference table
for Steel 4140 ( AISI, ASTM, UNS) and its European equivalent 42CrMo4 (1.7225) ( EN )
| EU EN |
USA - |
Germany DIN,WNr |
Japan JIS |
France AFNOR |
England BS |
Italy UNI |
Spain UNE |
China GB |
Sweden SS |
Finland SFS |
Russia GOST |
Inter ISO |
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| 42CrMo4 (1.7225) |
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Chemistry (range or Maximum in %)
| GRADE | THICKNESS | C | MN | P | S | SI | NI | CR | MO |
| AISI 4140 | 1/4" THRU 14" | .36/.44 | .70/1.00 | 0.035 | 0.04 | .15/.40 | - | .80/1.15 | .15/.25 |
Mechanical properties of steel 42CrMo4 (1.7225)
| Nominal diameter (mm): | to 16 | 16 - 40 | 40 - 100 | 100 - 160 | 160 - 250 | 250 - 330 | 330 - 660 |
| Rm - Tensile strength (MPa) (+QT) | 1100-1300 | 1000-1200 | 900-1100 | 800-950 | 750-900 | 700 | 600 |
| Nominal thickness (mm): | 0.3 - 3 |
| Rm - Tensile strength (MPa) (+A) | 620 |
| Rm - Tensile strength (MPa) (+AC) | 630 |
| Nominal thickness (mm): | to 8 | 8 - 20 | 20 - 50 | 50 - 80 |
| Rm - Tensile strength (MPa) (+QT) | 1100 | 1000 | 900 | 800 |
| Rm - Tensile strength (MPa) (+C) | 720 |
| Rm - Tensile strength (MPa) (+LC) | 670 |
| Nominal diameter(mm): or for flat products thickness: to 8; 8-20; 20-60; 60-100; 100-160; | to 16 | 16 - 40 | 40 - 100 | 100 - 160 | 160 - 330 | 330 - 660 |
| Re - Upper yield strength or Rp0.2 - 0.2% proof strength (MPa) (+QT) |
900 | 750 | 650 | 500-550 | 460-500 | 390 |
| Nominal thickness(mm): | 0.3 - 3 |
| Rp0.2 0.2% proof strength (MPa) (+A) | 480 |
| KV - Impact energy (J) longitud., (+QT) | +20° 30-35 |
| KV - Impact energy (J) transverse, (+QT) | +20° 22 |
| Nominal thickness (mm): | 0.3 - 3 |
| A - Min. elongation Lo = 80 mm (%) (+A) | 15 |
| A - Min. elongation at fracture (%) transverse, (+QT) | 10-14 |
| A - Min. elongation at fracture (%) (+C) | 4 |
| A - Min. elongation at fracture (%) (+LC) | 6 |
| Nominal thickness (mm): | to 16 | 16 - 40 | 40 - 100 | 100 - 160 | 160 - 250 |
| A - Min. elongation Lo = 5,65 √ So (%) (+QT), round products | 10 | 11 | 12 | 13 | 14 |
| Nominal diameter (mm): or for flat products thickness: to 8; 8-20; 20-60; 60-100; 100-160; | to 16 | 16 - 40 | 40 - 100 | 100 - 160 | 160 - 250 |
| Z - Reduction in cross section on fracture (%) (+QT) | 40 | 45 | 50 | 50 | 55 |
| Z - Reduction in cross section on fracture (%) (+AC) | 57 |
| Brinell hardness (HBW): (+S) | 255 |
| Brinell hardness (HBW): (+A) | 241 |
| Vickers hardness ( HV): (+A) | 195 |
| Vickers hardness ( HV): (+QT) | 340 - 490 |
Properties of steel 42CrMo4 (1.7225)
| Weldability: Bad weldability due to the high crack danger. Hardenability: Medium-good hardenability, suitable for hot purposes till a temperature of 500 C. It can be hardened in oil. |
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