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20NiCrMo2-2
Carburized Steel Technical Features According to EN10084 |
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Carburizing steels are steels which require
features such as softness and satiety in the core, and hardness |
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and wear resistance on the surface. These
steels can be used both alloyed or non-alloyed, and they contain low carbon
(0.10-0.25%). |
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These steels are used in parts where
variable-impact loads and wear are effective, as they are resistant to wear
on the surface despite |
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their
high satiety values. |
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Material Name: |
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Material No: |
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Equivalent Qualities: |
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20NiCrMo2-2 |
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1.6523 |
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SAE 8620 |
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20NiCrMoS2-2 |
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1.6526 |
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AFNOR 20NCD2 |
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AFNOR 20NCD2u |
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1. |
CHEMICAL COMPOSITION |
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Chemical
Composition % by Mass |
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Quality |
C |
Simax. |
Mn |
Pmax. |
S |
Cr |
Mo |
Ni |
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20NiCrMo2-2 |
0,17 – 0,23 |
0,40 |
0,65 – 0,95 |
0,025 |
max. 0,035 |
0,35 – 0,70 |
0,15 – 0,25 |
0,40 – 0,70 |
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20NiCrMoS2-2 |
0,020 – 0, 040 |
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2. |
MECHANICAL FEATURES |
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Cold Cutability Annealing (+S): |
– |
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Soft Annealing (+A): |
max. 212 HB |
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Annealing by Hardness Range (+TH): |
min. 161 HB |
max. 212 HB |
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Annealing
by Ferrite-Perlite Structure and Hardness Range (+FP): |
min. 149 HB |
max. 194 HB |
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Normalised (+N): |
– |
– |
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Rockwell Class C
Hardness Limit Values for Special Steel Qualities with Normal Hardenability
Requirements |
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Symbol |
Range Limits |
Distance in mm from the Quenched End |
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HRC Class Hardness |
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1,5 |
3 |
5 |
7 |
9 |
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20NiCrMo2-2 |
+H |
max. |
49 |
48 |
45 |
42 |
36 |
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20NiCrMoS2-2 |
min. |
41 |
37 |
31 |
25 |
22 |
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Symbol |
Range Limits |
Distance in mm from the Quenched End |
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HRC Class Hardness |
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11 |
13 |
15 |
20 |
25 |
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20NiCrMo2-2 |
+H |
max. |
33 |
31 |
30 |
27 |
25 |
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20NiCrMoS2-2 |
min. |
20 |
– |
– |
– |
– |
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Symbol |
Range Limits |
Distance in mm from the Quenched End |
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HRC Class Hardness |
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30 |
35 |
40 |
45 |
50 |
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20NiCrMo2-2 |
+H |
max. |
24 |
24 |
23 |
– |
– |
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20NiCrMoS2-2 |
min. |
– |
– |
– |
– |
– |
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3. |
TECHNICAL DELIVERY CONDITIONS |
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EN 10277-4: 2008 Bright Steel Material.
Technical Delivery Conditions. Carburized Steels. |
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EN 10084: 2008 Carburized Steels. Technical
Delivery Conditions. |
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4. |
AREAS OF USE |
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Carburized steels are usually used in
components such as gears, shafts, rollers, bushes, rolling and guide |
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bearings, discs, piston pins. |
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