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C55E - Nr.1.1203

The high carbon levels of this non-alloy quenched and tempered steel allow high hardness and transformed structures to be obtained even in pieces of considerable size.  Often used for surface tempering.

References and Comparable Standards

Standard Reference: EN ISO 683-1: 2018 (Hot-rolled products) | EN 10277-2: 2008 (Bright products))
EUROPE ITALY GERMANY FRANCE UK USA
EN 10083-2: 2006
EN 10277-2: 2008		 (UNI 7845-78) (DIN 17200-86) (NF A 35-552-86) (BS 970 pt.3-96) ASTM A 29
Grade N°   Werkstoff N°      
C55E 1.1203 C55 Ck55 1.1203 XC 55 - 1055
C55R 1.0535 Cm55 1.1209

Chemical Composition (Cast Analysis) (%)

EUROPE C Si Mn P/max S Cr/max Mo/max Ni/max Cu/max
C55E 0,52÷0,60  0,10÷0,40  0,60÷0,90 0,025 ≤ 0,035 0,40 0,10 0,40 0,30
C55R 0,020÷0,040

Mechanical Properties - As Rolled Condition

Size
(mm)		 HB max to condition  Quenched and tempered (+QT) Normalized (+N)
Treated to improve shearability (+S) Soft annealing (+A) Rp0,2 (MPa) min Rm (MPa) min A5 (%) min Z (%) min KV (J) min Rp0,2 (MPa) min  Rm (MPa) min A5 (%) min
d≤16 255 229 550 800÷950 12 30 - 370 680 11
16<d≤40 255 229 490 750÷900 14 35 - 330 640 12
40<d≤100 255 229 420 700÷850 15 40 - 330 640 12
100<d≤160 255 229 - - - - - 300 620 12
160<d≤250 255 229 - - - - - 300 620 12

 

Mechanical Properties – Bright Steel

Size
(mm)		 Rolled+Turned (+SH) Cold Drawn (+C)
Hardness HB Rm (MPa) Rp0,2 (MPa)
min		 Rm (MPa) A5 (%) min
5≤d≤10 - - 590 770÷1100 5
10<d≤16 - - 520 730÷1080 6
16<d≤40 181÷269 610÷910 440 690÷1050 7
40<d≤63 181÷269 610÷910 390 650÷1030 8
63<d≤100 181÷269 610÷910 - - -

Working Temperatures Recommended

Operation °C
Hot forgings deformation 850÷1150
Normalizing 825÷865
Soft annealing 650÷700
Quenching in oil 805÷845
Tempering 550÷660

Hardness Limits (Jominy Test)

Limits of range Hardness HRC at a distance from quenched end of test pieces (mm)
1 2 3 4 5 6  7 8 9 10 11 13 15 20 25 30
+H Max 65 64 63 62 60 57 52 45 37 36 35 34 33 32 30 29
Min  58 55 47 37 33 32 31 30 29 28 27 26 25 24 22 20
Relevant Products
C22E - Nr.1.1151
C22E - Nr.1.1151

KV20 R20Pb
C30E - Nr.1.1178 C30R - Nr.1.1179
C30E - Nr.1.1178 C30R - Nr.1.1179

KV30 R30S
C35E - Nr.1.1181 C35R - Nr.1.1180
C35E - Nr.1.1181 C35R - Nr.1.1180

KV35 R35Pb
C40E - Nr.1.1186 C40R - Nr.1.1189
C40E - Nr.1.1186 C40R - Nr.1.1189

KV40 R40S R40Pb
C45E - Nr.1.1191 C45R - Nr.1.1201
C45E - Nr.1.1191 C45R - Nr.1.1201

KV45 R45S R45PB
C50E - Nr.1.1206
C50E - Nr.1.1206

KV50 R50Pb
(E335+S) - Nr.(1.0060) (E335GC) - Nr.(1.0543)
(E335+S) - Nr.(1.0060) (E335GC) - Nr.(1.0543)

RE60S