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20CrNi4

Steel with the addition of chromium and nickel in higher quantities than RN0 and RN2.  Has a greater temperability, with higher surface and core characteristics.

References and Comparable Standards

Standard Reference: UNI 7846: 78 ((Hot-rolled and hot-rolled + turned products) | UNI 10233-5:93 (Bright products)
EUROPE ITALY GERMANY FRANCE UK USA
EN 10084:2008
EN 10277-4:2008		 (UNI 7846-78) (DIN 17210-84) (NFA35-551-86) (BS970 pt.3-91) ASTM A 29
Grade N°   Werkstoff N°      
- -  20CrNi4 - - - - -

Chemical Composition (Cast Analysis) (%)

EUROPE C Si Mn P/max S Cr  Mo/max Ni Pb
20CrNi4 0,18÷0,23 0,15÷0,40 0,80÷1,10  0,035  0,020÷0,035 0,90÷1,20  0,10 0,90÷1,20 -
20CrNi4Pb 0,15÷0,30

Mechanical Properties - As Rolled Condition

Hardness (HB) - Soft annealed Hardness (HB) - Spherodizing Hardness (HB) - Annealing to obtain a particular structure
≤ 240 ≤ 225 ≥ 155  ≤ 207

 

Mechanical Properties – Bright Steel

Size
(mm)		 Cold drawn products obtained from annealed hot rolled products Annealed + Cold drawn or annealed + Turned products
Soft annealed HB max Isothermal annealed HB max Soft annealed HB max Isothermal annealed HB
5≤d≤10 275 265 240 155÷210
10<d≤16 265 255 240 155÷210
16<d≤40 260 250 235  155÷207
40<d≤100 255 245 235  155÷207

For size <5 mm the mechanical properties may be agreed at the time of enquiry and order

Working Temperatures Recommended

Operation °C
Hot forgings deformation 900÷1150
Carburizing temperature 870÷900
Core quenching temperature  850÷880
Case quenching temperature 810÷840
Tempering 150÷200

Hardness Limits (Jominy Test)

Limits of range Hardness HRC at a distance from quenched end of test pieces (mm)
1,5 3 5 7 9 11  13 15 20       25  30  35 40  45 50
+H Max 50 49 48 47 45 44 42 41 38 35 33 32 31 30,5 30
Min  40 38,5 36,5 34 32 29 27 25,5 23 21 19,5 18 17 16 15
 
Relevant Products
16MnCr5 - Nr.1.7131 16MnCrS5 - Nr.1.7139
16MnCr5 - Nr.1.7131 16MnCrS5 - Nr.1.7139

RM16 RM16Pb
20MnCr5 - Nr.1.7147 20MnCrS5 - Nr.1.7149
20MnCr5 - Nr.1.7147 20MnCrS5 - Nr.1.7149

RM20
12NiCr3
12NiCr3

RN0 RN0Pb
16NiCr4 - Nr.1.5714 16NiCrS4 - Nr.1.5715
16NiCr4 - Nr.1.5714 16NiCrS4 - Nr.1.5715

RN2 RN2Pb
16NiCr11
16NiCr11

RG2
20NiCrMo2-2 - Nr.1.6523 20NiCrMoS2-2 - Nr.1.6526
20NiCrMo2-2 - Nr.1.6523 20NiCrMoS2-2 - Nr.1.6526

RC0
17NiCrMo6-4 - Nr.1.6566 17NiCrMoS6-4 - Nr.1.6569
17NiCrMo6-4 - Nr.1.6566 17NiCrMoS6-4 - Nr.1.6569

RC2 RC2Pb