| C60R EN 10083-2:2002, Number: 1.1223 | Comparison of steel grades | |
| JUS | Č.1780 | |
| DIN | Cm60 | |
| BS | - | |
| GOST | - | |
| AISI | - | |
| UNI | ||
| NF | - | |
Chemical analysis -% by mass
| Chemical elements | C | Si max. |
Mn | P max. | S | Cr max. |
Mo max. |
Ni max. |
Cr+Mo+Ni max. |
| %, by mass | 0,57-0,65 | 0,40 | 0,60-0,90 | 0.025 | 0,020-0,040 | 0,40 | 0,10 | 0,40 | 0,63 |
| Permissible deviation | ± 0.02 | +0,03 | ± 0,04 | + 0.005 | ± 0.005 | +0,05 | +0,03 | +0,05 | - |
Jominy’s hardenability band
| Distance in mm from quenched end Hardness in HRC | ||||||||||||||||||
| Symbol | mm | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 13 | 15 | 20 | 25 | 30 | |
| +H | max. | 67 | 66 | 65 | 63 | 62 | 59 | 54 | 47 | 39 | 37 | 36 | 35 | 34 | 33 | 31 | 30 | |
| min. | 60 | 57 | 50 | 39 | 35 | 33 | 32 | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 23 | 21 | ||
Tentative values for the ’’C’’ scale Rockwell hardness for special steel grades with restricted hardenability scatter bands (+HH and +Hl grades)
| Symbol | Distance in mm ftom the quenched end HRC hardness | ||
| 1 | 4 | 5 | |
| +HH5 +HH15 +HL5 +HL15 | - | - | 44 to 62 |
| 62 to 67 | - | 44 to 62 | |
| - | - | 35 to 53 | |
| 60 to 65 | - | 35 to 53 | |
Maximum hardness for products to be supplied in the ’’treated to improve shearability (+S)’’ or
| ’’soft annealed (+A)’’ condition +S HB max. | +A HB max. |
| 255 | 241 |
Mechanical properties in the quenched and tempered condition (+QT)
| Mechanical properties for the ruling sections (see prEN10083-1:2002, Annex A) with a diameter (d) or for flat products trickness (t) of | |||||
| d ≤ 16mm t ≤ 8mm | 16mm < d ≤ 40mm 8mm < t ≤ 20mm | 40mm < d ≤ 100mm 20mm < t ≤ 60mm | |||
| Re min (MPa) | 580 | 520 | 450 | ||
| Rm (MPa) | 850-1000 | 800-960 | 750-900 | ||
| A min. (%) | 11 | 13 | 14 | ||
| Z min. (%) | 25 | 30 | 35 | ||
| KV min. (J) | - | - | - | ||
Mechanical properties in the normalized condition – (+N)
| Mechanical properties for products with a diameter (d) or, for flat products trickness (t) of | |||
| d ≤ 16mm t ≤ 16mm | 16mm < d ≤ 100mm 16mm < t ≤ 100mm | 100mm < d ≤ 250mm 100mm < t ≤ 250mm | |
| Re min. (MPa) | 380 | 340 | 310 |
| Rm min. (MPa) | 710 | 670 | 650 |
| A min. (%) | 10 | 11 | 18 |
Heat treatment conditions
| Quenching 0C | Quenching agent | Tempering temperature 0C | Hardening temperature in the end quench test 0C | Normalizing 0C |
| 800-840 | Oil or water (ulje ili voda) | 550-660 | 8300±5 | 820 to 880 |
Source:
Tags: C60R
