18CrNiMo7-6

18CrNiMo7-6 EN 10084-1998, Number: 1.6587  Comparison of steel grades
JUS Ć.4520
DIN 17CrNiMo6
BS -
GOST -
AISI 4820
UNI -
NF 18NCD6

Chemical composition (cast analysis)

Chemical elements C Si max Mn P max. S Cr Mo Ni
%, by mass 0,15-0,21 0,40 0,50-0,90 0,035 ≤ 0,035 1,50-1,80 0,25-0,35 1,40-1,70
Permissible deviation ±  0,02 + 0,03 ± 0,04 + 0,005 +  0,005 ± 0,05 ± 0,02 ± 0,02

Hardness limits for steel

Hardness HRC at a distance from quenched end of test piece (in milimetres) of
mm 1,5 3 5 7 9 11 13 15 20 25 30 35 40 45 50
+H max. 48 48 48 48 47 47 46 46 44 43 42 41 41 - -
min. 40 40 39 38 37 36 35 34 32 31 30 29 29 - -
+HH max. 48 48 48 48 47 47 46 46 44 43 42 41 41 - -
min. 43 43 42 41 40 40 39 38 36 35 34 33 33 - -
+HL max. 45 45 45 45 44 43 42 42 40 39 38 37 37 - -
min. 40 40 39 38 37 36 35 34 32 31 30 29 29 - -

Hardness requirements for products delivered in the conditions ’’treated to improve shearabilita’’ (+S), ’’anneled to maximum hardness requirements’’ (+A), ’’treated to hardness range’’ (+TH) or ’’treated to ferrite-pearlite structure and hardness range’’ (+FP)

Brinell hardness in the condition
+S max. +A max. +TH +FP
min. max. min. max.
255 229 179 229 159 207

Non-metallic inclusions Requirements for microscopic degree of purity when tested in accordance with DIN 50 602 (method K) (valid for oxidic non-metallic inclusions)

D (mm) Bars Diameter d (mm) K Total characteristic value K (oxides) for the individual cast
140 < d  200 K 4 ≤ 50
100 < d ≤ 140 K 4 ≤ 45
70 < d ≤ 100 K 4 ≤ 40
35 < d ≤ 70 K 4 ≤ 35
17 < d ≤ 35 K 3 ≤ 40
8 < d ≤ 17 K 3 ≤ 30
 d ≤ 8 K 2≤ 35

Conditions for heat treating test bars and treatment of the steels

End quenchh test Quenching, 0C Carbunnzing temperature, 0C Core-hardening temperature, 0C Case-hardening temperature, 0C Tempering, 0C
860 880 to 980 830 to 870 780 to 820 150 to 200


FEE460KTN 55EE E460FP AE460KT S460NL TStE460 FeE275KTN 43EE AE285KT TStE285 SPHE SPHD SPHC SM570 SM520 SM490 SM400 SG365 SG325 SG295 SG255 SAPH440 SAPH400 SAPH370 SAPH310 FeE460KGN E460R AE460KW AE460KG STE460 S460N E420R AE420KW AE420KG STE420 S420N 2134-0 E355R FEE355KGN AE3555KW STE355 S355N S355K2G4 S355K2G3 A572GR50 SM490A SS490 E36-2 ST52-3 FE510B S355JR S355J2WP S355NL S355J2G4 SS490B AE355C E36-3 ST52-3U FE510C S355J0 FEE275KGN AE285KW AE285KG STE285 S275 A529 E28-2 ST44-2 FE430B S275JR S275NL S275J2G4 FE430D E28-4 ST44-3 S275N S275J2G3 E28-3 ST44-3U FE430C S275J0 SM400A S235JRG2 A36 A283C SS400 E24-2 ST37-2 S235JR S235J2G4 SM400B 40C E243 ST37-3U FE360C S235J0 P355NH JIS3125 3125 JIS3125SPAH A70-2 ST70-2 FE690 E360 ST60-2 A590 FE590 E335 SS500 A602 ST502 FE4902 E295 DD14 DD13 DD12 DD11
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