| 25CrMo4 EN 10083-3:2002, Number: 1.7218 | Comparison of steel grades | |
| JUS | Č.4730 | |
| DIN | 25CrMo4 | |
| BS | 708 M 25, 708 A 25 | |
| GOST | 20HM, 30HM | |
| AISI | 5140 | |
| UNI | 25CrMo4 | |
| NF | 25 CD 4, 25CrMo4 | |
25CrMo4 properties and heat treatment forgings, Including 25CrMo4 application and specifications, Bebon steel has all specifications，Including 25CrMo4 bars, rod, Plate, bar, square steel, rectangular steel,forgings, Bebonchina can own production and sales.
25CrMo4 steel plate Chemical analysis -% by mass
| Chemical elements | C | Si | Mn | P | S | Cr | Mo |
| %, by mass | 0,22 - 0,29 | £ 0,40 | 0,60 - 0,90 | max 0.025 | max 0,035 | 0,90-1,20 | 0,15-0,30 |
| Permissible deviation | ± 0.02 | ± 0,03 | ± 0,04 | + 0.005 | + 0.005 | ± 0.05 | ± 0.03 |
25CrMo4 steel sheet Mechanical properties in the quenched and tempered condition
| d ≤ 16mm oder t ≤ 8mm | 16mm < d ≤ 40mm 8mm < t ≤ 20mm | 40mm < d ≤ 100mm 20mm < t ≤ 60mm | 100mm < d ≤ 160mm 60mm < t ≤ 100mm | 160mm < d ≤ 250mm 100mm < t ≤ 160mm | |
| Re min (MPa) | 700 | 600 | 450 | 400 | - |
| Rm (MPa) | 900-1100 | 800-950 | 700-850 | 650-800 | - |
| A min. (%) | 12 | 14 | 15 | 16 | - |
| Z min. (%) | 45 | 55 | 60 | 60 | - |
| KV min. (J) | 50 | 50 | 50 | 45 | - |
Jominy’s hardenability band
| Distance in mm from quenched end Hardness in HRC (mm) | ||||||||||||||||
| mm | 1,5 | 3 | 5 | 7 | 9 | 11 | 13 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 | |
| +H | max. | 52 | 52 | 51 | 50 | 48 | 46 | 43 | 41 | 37 | 35 | 33 | 32 | 31 | 31 | 31 |
| min. | 44 | 43 | 40 | 37 | 34 | 31 | 29 | 27 | 23 | 21 | 20 | - | - | - | - | |
| +HH* | max. | 52 | 52 | 51 | 50 | 48 | 46 | 43 | 41 | 37 | 35 | 33 | 32 | 31 | 31 | 31 |
| min. | 47 | 46 | 44 | 41 | 39 | 37 | 34 | 32 | 28 | 26 | 24 | 23 | 22 | 22 | 22 | |
| +HL* | max. | 49 | 49 | 47 | 47 | 43 | 41 | 38 | 36 | 32 | 30 | 29 | 28 | 27 | 27 | 27 |
| min. | 44 | 43 | 40 | 37 | 34 | 31 | 29 | 27 | 23 | 21 | 20 | - | - | - | - | |
25CrMo4 steel plate/sheet Heat treatment conditions – informative
| Hardening temperature in the end quench test | Quenching temperature | Quenching in | Tempering temperature |
| 8500±50C | 840-900 0C | Water or oil | 540-680 0C |
Maximum hardness for products to be supplied in the ’’treated to improve shearability (+S)’’ orsoft annealed (+A)’’ condition
| +S HB max. | +A HB max. |
| 255 | 212 |
| 25CrMo4 EN 10250-3:1999, Number: 1.7218 | Comparison of steel grades | |
| JUS | Č.4730 | |
| DIN | 25CrMo4 | |
| BS | 708 M 25, 708 A 25 | |
| GOST | 20HM, 30HM | |
| AISI | 5140 | |
| UNI | 25CrMo4 | |
| NF | 25 CD 4, 25CrMo4 | |
25CrMo4 steel plateChemical analysis -% by mass
| Chemical elements | C | Si | Mn | P max. | S max. |
Cr | Mo |
| %, by mass | 0,22 - 0,29 | £ 0,40 | 0,60 - 0,90 | 0.035 | 0.035 | 0,90 -1,20 | 0,15 – 0,30 |
| Permissible deviation | ± 0,02 | + 0,03 | ± 0,04 | + 0,005 | + 0,005 | ± 0,05 | ± 0,03 |
At the option the manufacturer the elements aluminium, titanium, vanadium and niobium may be added singly or in combination for grain control
purposes. Elements not quoted in tables shall not be added intentionally to the steel without the agreement of the purchaser, except for the purpose
of finishing the heat. Mechanical properties in the quenched and tempered condition
| Trickness of ruling section tR | |||||
| Diameter in mm | ≤ 70mm tR (longitudinal) | 70< tR ≤160mm | 160<tR≤330mm | ||
| Re min (N/mm2) | 450 | 400 | 380 | ||
| Rm min (N/mm2) | 700 | 650 | 600 | ||
| A % min. | l-longitudinal | 15 | 17 | 18 | |
| tr -transverse | - | 13 | 14 | ||
| KV min (J) | l-longitudinal | 50 | 45 | 38 | |
| tr -transverse | - | 27 | 22 | ||
25CrMo4 steel sheet Heat treatment conditions
| Quenching temperature, 0C | Tempering temperature, 0C |
| 840 to 880 | 540 to 680 |
Quenching from hardening may be carried out in oil, water, or water based solutions. Caution should be observed in the use of water as a quenching medium to avoid the risk of cracking the forgings
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