FREE CUTTING STEELS

Free cutting steels are steels with low machining manufacturing cost generally due to broken machining in fast chipping process. Due to their easy processability, such steels are the ones most suitable for machining processes such as longitudinal turning and facing in revolver or multishaft turning lathes, toothing, drilling and reaming.



      STEELS NOT UNDERGOING HEAT TREATMENT
      CHEMICAL COMPOSITION
Material No Symbol AISI-SAE C Si Mn Pmax S Pb
1.0711 9S20 1212 <0,13 <0,05 0,60
1,20
0,1 0,18
0,25
 
1.0715 9SMn28 1213 <0,14 <0,05 0,90
1,30
0,1 0,24
0,32
 
1.0718 9SMnPb28 12L13 <0,14 <0,05 0,90
1,30
0,1 0,24
0,32
0,15
0,30
1.0736 9SMn36 1215 <0,15 <0,05 1,00
1,50
0,1 0,32
0,40
 
1.0737 9SMnPb36 12L14 <0,15 <0,05 1,00
1,50
0,1 0,32
0,40
0,15
0,30
      STEELS SUBJECT TO CEMENTATION PROCESS
      CHEMICAL COMPOSITION
Material No Symbol AISI-SAE C Si Mn Pmax S Pb
1.0721 10S20 1108 0,07
0,13
0,10
0,40
0,50
0,90
0,06 0,15
0,25
 
1.072 10SPb20 11L08 0,07
0,13
0,10
0,40
0,50
0,90
0,06 0,15
0,25
0,15
0,30
      STEELS SUBJECT TO QUENCHING AND TEMPERING PROCESS
      CHEMICAL COMPOSITION
Material No Symbol AISI-SAE C Si Mn Pmax S Pb
1.0726 35S20 1140 0,32
0,39
0,10
0,40
0,50
0,90
0,06 0,15
0,25
-
1.0727 45S20 1146 0,42
0,50
0,10
0,40
0,50
0,90
0,06 0,15
0,25
-
1.0728 60S20 - 0,57
0,65
0,10
0,40
0,50
0,90
0,06 0,15
0,25
-


FIELDS OF USE
Material No Symbol AISI-SAE  
1.0711 9S20 1212 Mass production parts in automobile industry, apparatus and device making
1.0715 9SMn28 1213 Mass production parts in automobile industry, device and apparatus making
1.0718 9SMnPb28 12L13 Mass production parts in automobile industry, device and apparatus making
1.0736 9SMn36 1215 Mass production parts in automobile industry, device and apparatus making
1.0737 9SMnPb36 12L14 Mass production parts in automobile industry, device and apparatus making
1.0721 10S20 1108 It is used in mass production in automobile industry, device and apparatus making
1.072 10SPb20 11L08 Mass production parts in automobile industry, device and apparatus making
1.0726 35S20 1140 High-strength mass production parts for automobile industry, device, apparatus and machines
1.0727 45S20 1146 Medium-strength mass production parts for automobile industry, device, apparatus and machines
1.0728 60S20 - High-strength mass production parts for automobile industry, device, apparatus and machines

MECHANICAL PARTICULARITIES IN PROCUREMENT OF FREE CUTTING STEELS IN COLD ROLLED OR NORMAL TEMPERED FORM

      cold rolled   normal annealed
      Tensile strength Rm Yielding point Re Elongation A normal Tensile strength Rm Yielding point Re Elongation
      ≤10
mm
>10
≤16
mm
>16
≤40
mm
>40
≤63
mm
≤10
mm
>10
≤16
mm
>16
≤40
mm
>40
≤63
mm
≤10
mm
>10
≤16
mm
>16
≤40
mm
>40
≤63
mm
tavlama
sıcaklığı
≤16
mm
>16
≤40
mm
>40
≤63
mm
≤16
mm
>16
≤40
mm
>40
≤63
mm
A
Material No Symbol AISI-SAE Mpa Mpa Mpa ᵒC Mpa Mpa > %
1.0711 9S20 1212 540
780
490
740
460
710
390
640
410 390 355 295 7 8 9 10 890
920
≥350 ≥350 ≥350 225 215 205 25
1.0715 9SMn28 1213 560
800
510
760
460
710
410
660
440 410 375 305 6 7 8 9 890
920
≥370 ≥370 ≥370 235 225 215 23
1.0718 9SMnPb28 12L13 560
800
510
760
460
710
410
660
440 410 375 305 6 7 8 9 890
920
≥370 ≥370 ≥370 235 225 215 23
1.0736 9SMn36 1215 560
800
540
780
430
680
430
680
440 430 390 315 6 7 8 9 890
920
≥380 ≥370 ≥360 235 225 215 23
1.0737 9SMnPb36 12L14 560
800
540
780
430
680
430
680
440 430 390 315 6 7 8 9 890
920
≥380 ≥370 ≥360 235 225 215 23
1.0721 10S20 1108 540
780
490
740
460
710
390
640
410 390 355 295 7 8 9 10 890
920
≥350 ≥350 ≥350 225 215 205 25
1.072 10SPb20 11L08 540
780
490
740
460
710
390
640
410 390 355 295 7 8 9 10 890
920
≥350 ≥350 ≥350 225 215 205 25
1.0726 35S20 1140 640
880
590
830
540
740
510
710
490 400 315 285 6 7 8 9 860
890
480
600
480
600
480
600
295 285 275 18
1.0727 45S20 1146 740
980
690
930
640
840
610
800
570 470 375 325 5 6 7 8 840
870
580
700
580
700
580
700
335 325 315 14
1.0728 60S20 - 830
1080
780
1030
740
930
710
900
645 540 430 355 5 6 7 8 820
850
660
780
650
770
640
760
365 355 345 9

MECHANICAL PARTICULARITIES IN PROCUREMENT OF FREE CUTTING STEELS

      In material procurement (unprocessed or peeled)
      hardness tensile strength
      <10
mm
11-16
mm
17-40
mm
41-63
mm
<10
mm
11-16
mm
17-40
mm
41-63
mm
Material No Symbol AISI-SAE ≤ BSD 30 Mpa
1.0711 9S20 1212 159 159 149 149 360
530
360
530
360
530
360
530
1.0715 9SMn28 1213 170 170 159 159 380
570
380
570
380
570
380
570
1.0718 9SMnPb28 12L13 170 170 159 159 380
570
380
570
380
570
380
570
1.0736 9SMn36 1215 174 174 163 159 390
590
390
590
380
550
370
540
1.0737 9SMnPb36 12L14 174 174 163 159 390
590
390
590
380
550
370
540
1.0721 10S20 1108 159 159 149 149 360
530
360
530
360
530
360
530
1.072 10SPb20 11L08 159 159 149 149 360
530
360
530
360
530
360
530
1.0726 35S20 1140 197 197 192 192 490
660
490
660
490
660
490
660
1.0727 45S20 1146 229 229 223 223 590
760
590
760
590
760
590
760
1.0728 60S20 - 269 269 261 261 670
880
670
880
660
870
650
860

HEAT TREATMENT CONDITIONS AND GAINED MECHANICAL PARTICULARITIES IN FREE CUTTING STEELS

      Heat Treatment Conditions Mechanical Particularities
                        Tensile strength (Rm) Yielding point (Re) Elongation (A)
      case hardening temperature hardening temperature Shock cooling Case hardening Tempering temperature ≤16mm >16 ≤40 mm >40 ≤63 mm ≤16mm >16 ≤40 mm >40 ≤63 mm ≤10
mm
>10
≤16
mm
>16
≤40
mm
>40
≤63
mm
Material No Symbol AISI-SAE ᵒC ᵒC water oil hot bath water oil hot bath ᵒC Mpa ≥ Mpa ≥ %
1.0711 9S20 1212 - - - - - - - - - - - - - - - - - - -
1.0715 9SMn28 1213 880
950
880
920
* - * * * * 150
200
- - - - - - - - - -
1.0718 9SMnPb28 12L13 880
950
880
920
* - * * * * 150
200
- - - - - - - - - -
1.0736 9SMn36 1215 880
950
880
920
* - * * * * 150
200
- - - - - - - - - -
1.0737 9SMnPb36 12L14 880
950
880
920
* - * * * * 150
200
- - - - - - - - - -
1.0721 10S20 1108 880
950
880
920
* * * * * * 150
200
- - - - - - - - - -
1.072 10SPb20 11L08 880
950
880
920
* - * * * * 150
200
- - - - - - - - - -
1.0726 35S20 1140 - 850
890
* - - - - - 540
680
620
760
580
730
540
690
420 365 352 13 14 16 17
1.0727 45S20 1146 - 850
890
- - - - - - 540
680
700
840
660
800
620
760
480 410 375 10 11 13 14
1.0728 60S20 - - 800
840
- - * - - - 540
680
830
980
780
930
740
880
570 490 450 7 8 10 11


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