CASE HARDENING STEELS

Case hardening steels are ones used in manufacturing of parts desired to be hard and resistant to wear on the surface yet softer and saturated in the core, between 0,10-0,20 C% ratio, as well as resistant to varying and pulsed forces.


CHEMICAL COMPOSITION
Material No Symbol AISI-SAE C Si Mn P max S max Cr Mo Ni
1.0301 C 10 1010 0,07
0,13
0,15
0,35
0,30
0,60
0,045 0,045      
1.0401 C 15 1015 0,12
0,18
0,15
0,35
0,30
0,60
0,045 0,045      
1.7015 15Cr3 5015 0,12
0,18
0,15
0,40
0,40
0,60
0,035 0,035 0,40
0,70
   
1.7131 16MnCr5 5120 0,14
0,19
≤0,40 1,00
1,30
0,035 0,035 0,80
1,10
   
1.7147 20MnCr5 5120 0,17
0,22
≤0,41 1,10
1,40
0,03 0,035 1,00
1,30
   
1.7325 25MoCr4   0,23
0,29
0,15
0,40
0,40
0,60
0,035 0,035 0,40
0,60
0,40
0,50
 
1.5919 15CrNi6   0,12
0,17
0,15
0,40
0,40
0,60
0,035 0,035 1,40
1,70
  1,40
1,70
1.5920 18CrNi8   0,15
0,20
0,15
0,40
0,40
0,60
0,035 0,035 1,80
2,10
  1,80
2,10
1.6587 17CrNiMo6   0,14
0,19
0,15
0,40
0,40
0,60
0,035 0,035 1,50
1,80
0,25
0,35
1,40
1,70
1.6523 21NiCrMo2 8620 0,18
0,23
0,20
0,35
0,70
0,90
0,04 0,04 0,40
0,60
0,15
0,25
0,40
0,70


FIELDS OF USE
Material No Symbol AISI-SAE  
1.0301 C 10 1010 Medium duty building and machine parts with low core resistance
1.0401 C 15 1015 Lever arm, bearing, reel, gearwheel, gauge etc building and machine parts
1.7015 15Cr3 5015 reel seat, gauge, piston pin, differential part, gearwheel, ball screw
1.7131 16MnCr5 5120 gearwheel, transmission component, loam, pin, cardan bearing
1.7147 20MnCr5 5120 transmission component, gearwheel, plate and conic gear, pin, bearing, thick-section loam
1.7325 25MoCr4   all kinds of transmission components, axle, loam, pin, bearing, diverter parts
1.5919 15CrNi6   Gearwheel chain wheel, loam in machinery and automobiles
1.5920 18CrNi8   Thick-section gearwheel, plate geared, drive part, etc. very heavy duty transmission components parts
1.6587 17CrNiMo6   very heavy duty transmission component parts, thick-section gears
1.6523 21NiCrMo2 8620 Very heavy duty, gearwheel, switch shell, pin, loam in machinery and automobiles

MECHANICAL PARTICULARITIES OF CASE HARDENING STEELS

      In material procurement After case hardening and hardening
      Yt Fp Q11
mm
Yielding point (Re) Tensile strength (Rm) Rupture elongation (A) Constriction (Z) Notch impact (DVM)
    Q30
mm
Q63
mm
Q11
mm
Q30
mm
Q63
mm
Q11
mm
Q30
mm
Q63
mm
Q11
mm
Q30
mm
Q63
mm
Q11
mm
Q30
mm
Material No Symbol AISI-SAE ≥Mpa Mpa ≥ % ≥ % ≥ J
1.0301 C 10 1010 131   90
126
390 295   640
780
490
640
  13 16   35 45   69 69
1.0401 C 15 1015 146   103
140
440 335   740
880
590
780
  12 14   35 45   48 48
1.7015 15Cr3 5015 174 126
174
118
160
510 440   780
1030
690
880
  10 11   35 40   41 41
1.7131 16MnCr5 5120 207 156
207
140
187
635 590 440 880
1180
780
1080
640
930
9 10 11 35 40 40 34 34
1.7147 20MnCr5 5120 217 170
217
152
201
735 685 540 1080
1370
980
1270
780
1080
7 8 10 30 35 35 34 34
1.7325 25MoCr4   217 170
217
152
201
735 685 540 1080
1370
980
1270
780
1080
7 8   30 35 35 34 34
1.5919 15CrNi6   217 170
217
152
201
685 635 540 960
1270
880
1180
780
1060
8 9 10 35 40 40 41 41
1.5920 18CrNi8   235 187
235
170
217
835 785 685 1230
1470
1180
1420
1080
1320
7 8 8 30 35 35 41 41
1.6587 17CrNiMo6   229 179
229
159
207
835 785 685 1180
1420
1080
1320
980
1270
7 8 8 30 35 35 41 41
1.6523 21NiCrMo2 8620 210 165
210
150
195
785 590 490 980
1270
780
1080
690
930
9 10 11 35 40 40 41 41

HEAT TREATMENT CONDITIONS OF CASE HARDENING STEELS

      hot
working temperature
soft annealing temperature annealing temperature for
certain endurance value before case hardening
annealing temperature for a
certain structure case
case
hardening type
of process
case hardening temperature Cooling
environment after case hardening
Core hardening temperature Intermediate annealing temperature Case
hardening
Material No Symbol AISI-SAE ᵒC ᵒC ᵒC ᵒC Direct hard. Simple hardening Double hardening ᵒC water oil hot float bath float bath Case hardening box air ᵒC ᵒC ᵒC water oil hot bath
1.0301 C 10 1010 1150
850
670
700
850
950
900
1000
* * - 900
950
* - * - * * 880
920
- - - - -
1.0401 C 15 1015 1150
850
670
700
850
950
900
1000
* * - 900
950
* - * - * * 880
920
- - - - -
1.7015 15Cr3 5015 1150
850
670
700
850
950
900
1000
* * - 900
950
* * * - * * 870
900
- - - - -
1.7131 16MnCr5 5120 1150
850
670
700
850
950
900
1000
* * * 900
950
- * * * * * 850
880
- 810
840
* * *
1.7147 20MnCr5 5120 1150
850
670
700
850
950
900
1000
* * * 900
950
- * * * * * 850
880
- 810
840
* * *
1.7325 25MoCr4   1150
850
670
700
850
950
900
1000
* - - 900
950
- * * - - - 890
920
- - - - -
1.5919 15CrNi6   1150
850
670
700
850
950
900
1000
- * * 900
950
- * * * * * 840
870
630
650
800
830
* * *
1.5920 18CrNi8   1150
850
670
700
850
950
900
1000
- * * 900
950
- * * * * * 840
870
630
650
800
830
* * *
1.6587 17CrNiMo6   1150
850
670
700
850
950
900
1000
- * * 900
950
- * * - * * 840
870
630
650
800
830
* * *
1.6523 21NiCrMo2 8620 1150
850
670
700
850
950
900
1000
* * - 900
950
- * * * * * 840
870
630
650
800
830
* * *


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