Free cutting steels
Free-cutting steels are steels formulated to machine readily and produce manageable chips during cutting. Their machinability makes them suitable for turned, drilled and threaded components produced in high volumes, including small precision parts and fasteners.
| Grade | Material no. | C | P | S | Mn | Si | Pb |
|---|---|---|---|---|---|---|---|
| 12SMnPb35 | — | max 0.15 | max 0.11 | 0.3 - 0.4 | 1 - 1.5 | max 0.05 | 0.15 - 0.35 |
| SUM23L | — | max 0.09 | 0.04 - 0.09 | 0.26 - 0.35 | 0.75 - 1.05 | — | 0.1 - 0.35 |
| SUM12 | — | 0.08 - 0.13 | max 0.04 | 0.08 - 0.13 | 0.6 - 0.9 | — | — |
| SUM42 | — | 0.37 - 0.45 | max 0.04 | 0.08 - 0.13 | 1.35 - 1.65 | — | — |
| 35SMn20 | — | 0.32 - 0.39 | max 0.06 | 0.15 - 0.25 | 0.9 - 1.4 | 0.15 - 0.4 | — |
| SUM11 | — | 0.08 - 0.13 | max 0.04 | 0.08 - 0.13 | 0.3 - 0.6 | — | — |
| SUM32 | — | 0.12 - 0.2 | max 0.04 | 0.1 - 0.2 | 0.6 - 1.1 | — | — |
| 17SMn20 | — | 0.14 - 0.2 | max 0.06 | 0.15 - 0.25 | 1.2 - 1.6 | 0.15 - 0.4 | — |
| SUM31L | — | 0.14 - 0.2 | max 0.04 | 0.08 - 0.13 | 1 - 1.3 | — | 0.1 - 0.35 |
| U 7 S 10 | 1.0700 | ≤0,10 | 0,08 | 0,08-0,12 | 0,40-0,70 | Spuren/Traces | — |
| C10RG1 | 1.0702 | ≤0,15 | 0,05 | 0,08-0,12 | 0,30-0,60 | Spuren/Traces | — |
| C10RG2 | 1.0703 | ≤0,15 | 0,05 | 0,08-0,12 | 0,30-0,80 | ≤0,40 | — |
| U 10 S 6 | 1.0706 | ≤0,15 | 0,08 | 0,03-0,08 | 0,30-0,60 | Spuren/Traces | — |
| C7RG1 | 1.0708 | ≤0,10 | 0,05 | 0,04-0,08 | 0,30-0,60 | Spuren/Traces | — |
| C7RG2 | 1.0709 | ≤0,10 | 0,05 | 0,04-0,08 | 0,30-0,80 | ≤0,40 | — |
| 15 S 10 | 1.0710 | 0,12-0,18 | 0,03 | 0,07-0,13 | 0,70-1,10 | 0,10-0,35 | — |
| 10 S 10 | 1.0711 | ≤0,12 | 0,03 | 0,08-0,13 | 0,75-1,10 | 0,10-0,35 | — |
| 18 S 10 | 1.0712 | 0,14-0,20 | 0,03 | 0,08-0,13 | 1,30-1,60 | 0,10-0,35 | — |
| 37 S 10 | 1.0713 | 0,32-0,39 | 0,03 | 0,07-0,13 | 1,35-1,65 | 0,10-0,35 | — |
| 1.0715 | 1.0715 | ≤0,14 | 0,11 | 0,27-0,33 | 0,90-1,30 | ≤0,05 | — |
| 1.0718 | 1.0718 | ≤0,14 | 0,11 | 0,27-0,33 | 0,90-1,30 | ≤0,05 | 0,20-0,35 |
| 11 SMnPbTe 30 | 1.0719 | ≤0,14 | 0,11 | 0,27-0,33 | 0,90-1,30 | ≤0,05 | 0,20-0,35 |
| 11 SMnPbBiTe 30 | 1.0720 | ≤0,14 | 0,11 | 0,27-0,33 | 0,90-1,30 | ≤0,05 | 0,20-0,35 |
| 1.0721 | 1.0721 | 0,07-0,13 | 0,06 | 0,15-0,25 | 0,70-1,10 | ≤0,40 | — |
| 1.0722 | 1.0722 | 0,07-0,13 | 0,06 | 0,15-0,25 | 0,70-1,10 | ≤0,40 | 0,20-0,35 |
| 15 S 20 | 1.0723 | 0,12-0,18 | 0,07 | 0,18-0,26 | 0,50-0,90 | 0,10-0,40 | — |
| 22 S 20 | 1.0724 | 0,18-0,25 | 0,07 | 0,15-0,25 | 0,50-0,90 | 0,10-0,40 | — |
| 15 SMn 13 | 1.0725 | 0,12-0,18 | 0,06 | 0,08-0,18 | 0,90-1,30 | ≤0,40 | — |
| 1.0726 | 1.0726 | 0,32-0,39 | 0,06 | 0,15-0,25 | 0,70-1,10 | ≤0,40 | — |
| 45 S 20 | 1.0727 | 0,42-0,50 | 0,06 | 0,15-0,25 | 0,70-1,10 | ≤0,40 | — |
| 60 S 20 | 1.0728 | 0,57-0,65 | 0,06 | 0,15-0,25 | 0,50-0,90 | 0,10-0,40 | — |
| 70 S 20 | 1.0729 | 0,60-0,72 | 0,07 | 0,15-0,25 | 0,50-0,70 | 0,15-0,25 | — |
| 1.0736 | 1.0736 | ≤0,14 | 0,11 | 0,34-0,40 | 1,00-1,50 | ≤0,05 | — |
| 1.0737 | 1.0737 | ≤0,14 | 0,11 | 0,34-0,40 | 1,00-1,50 | ≤0,05 | 0,20-0,35 |
| 11 SMnPbTe 37 | 1.0738 | ≤0,14 | 0,11 | 0,34-0,40 | 1,00-1,50 | ≤0,05 | 0,20-0,35 |
| 11 SMnPbBiTe 37 | 1.0739 | ≤0,14 | 0,11 | 0,34-0,40 | 1,00-1,50 | ≤0,05 | 0,20-0,35 |
| 15 SPb 20 | 1.0753 | 0,12-0,18 | 0,07 | 0,18-0,26 | 0,50-0,90 | 0,10-0,40 | 0,15-0,30 |
| 22 SPb 20 | 1.0754 | 0,18-0,25 | 0,07 | 0,15-0,25 | 0,50-0,90 | 0,10-0,40 | 0,15-0,30 |
| 35 SPb 20 | 1.0756 | 0,32-0,39 | 0,06 | 0,15-0,25 | 0,70-1,10 | ≤0,40 | 0,15-0,35 |
| 45 SPb 20 | 1.0757 | 0,42-0,50 | 0,06 | 0,15-0,25 | 0,70-1,10 | ≤0,40 | 0,15-0,35 |
| 60 SPb 20 | 1.0758 | 0,57-0,65 | 0,06 | 0,18-0,25 | 0,70-1,10 | 0,10-0,30 | 0,15-0,35 |
| 70 SPb 20 | 1.0759 | 0,65-0,75 | 0,07 | 0,15-0,25 | 0,50-0,90 | 0,10-0,40 | 0,15-0,30 |
| 38 SMn 28 | 1.0760 | 0,35-0,40 | 0,06 | 0,24-0,33 | 1,20-1,50 | ≤0,40 | — |
| 38 SMnPb 28 | 1.0761 | 0,35-0,40 | 0,06 | 0,24-0,33 | 1,20-1,50 | ≤0,40 | 0,15-0,35 |
| 40S20 | 1.0762 | 0,40-0,48 | 0,06 | 0,24-0,33 | 1,30-1,70 | ≤0,40 | — |
| 44 SMnPb 28 | 1.0763 | 0,40-0,48 | 0,06 | 0,24-0,33 | 1,30-1,70 | ≤0,40 | 0,15-0,35 |
| 36 SMn 14 | 1.0764 | 0,32-0,39 | 0,06 | 0,10-0,18 | 1,30-1,70 | ≤0,40 | — |
| 36 SMnPb 14 | 1.0765 | 0,32-0,39 | 0,06 | 0,10-0,18 | 1,30-1,70 | ≤0,40 | 0,15-0,35 |
| SAE 1215 | 1.9704 | ≤0,09 | 0,040-0,090 | 0,260-0,350 | 0,75-1,05 | — | — |
Standards covering this category
23Property ranges
9| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| Rm | N/mm² | 360 | 1030 | 17 |
| A | % | 5 | 11 | 17 |
| A5 | % | 14 | 17 | 1 |
| Z | % | 20 | 20 | 1 |
| HB | — | 105 | 242 | 17 |
| rho | g/cm³ | 7.8 | 7.85 | 40 |
| rho_el | nΩ·m | 250 | 250 | 3 |
| Ac1 | °C | 730 | 730 | 1 |
| Ac3 | °C | 830 | 830 | 1 |
Derived from 40 grades in this category with a recorded value.
Composition range
8| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| C | % | 0.07 | 0.75 | 49 |
| Si | % | 0.05 | 0.4 | 38 |
| P | % | 0.03 | 0.11 | 49 |
| S | % | 0.03 | 0.4 | 49 |
| Mn | % | 0.3 | 1.7 | 49 |
| Te | % | 0.01 | 0.05 | 4 |
| Pb | % | 0.1 | 0.35 | 19 |
| Bi | % | 0.05 | 0.08 | 2 |
Derived from 49 grades in this category with a recorded value.
Heat treatment
1| Operation | MinTemperature (°C) | MaxTemperature (°C) | Grades |
|---|---|---|---|
| tempering | — | — | 1 |