
| P | Steel | K | Cast Iron | S | High-Temp Alloys | |
| DIN | M | Stainless Steel | N | Non-Ferrous | H | Hardened Materials |
| material | strength | hardness | hardness | material | ||||
| group | description content | RM (MPa)* | (HB) | (HRC) | number | |||
| P0 | Low-Carbon Steels, Long Chipping | C <0,25% | <530 | <125 | ||||
| P1 | Low-Carbon Steels, Short Chipping, Free Machining | C <0,25% | <530 | <125 | C15, Ck22, ST37-2, S235JR, 9SMnPb28, GS38 | |||
| P2 | Medium- and High-Carbon Steels | C >0,25% | >530 | <220 | <25 | ST52, S355JR, C35, GS60, Cf53 | ||
| P3 | Alloy Steels and Tool Steels | C >0,25% | 600–850 | <330 | <35 | 16MnCr5, Ck45, 21CrMoV5-7, 38SMn28 | ||
| P4 | Alloy Steels and Tool Steels | C >0,25% | 850–1400 | 340–450 | 35–48 | 100Cr6, 30CrNiMo8, 42CrMo4, C70W2, S6525, X120Mn12 | ||
| P5 | Ferritic, Martensitic, and PH Stainless Steels | 600–900 | <330 | <35 | 100Cr6, 30CrNiMo8, 42CrMo4, C70W2, S6525, X120Mn12 |
P6 High-Strength Ferritic, Martensitic,
and PH Stainless Steels M1 X5CrNi 18 10, X2CrNiMo 17 13 2, G-X25CrNiSi18 9,
Austenitic Stainless Steel <600 130–200
X15CrNiSi 20 12
M2 High-Strength Austenitic Stainless X2CrNiMo 13 4, X5NiCr 32 21, X5CrNiNb 18 10,
and Cast Stainless Steels G-X15CrNi 25-20 M3 X8CrNiMo27 5, X2CrNiMoN22 5 3, X20CrNiSi25 4,
Duplex Stainless Steel <800 135–275 <30
G-X40CrNiSi27 4
K1 Grey Cast Iron 125–500 120–290 <32 GG15, GG25, GG30, GG40, GTW40
K2 Low- and Medium-Strength Ductile Irons (Nodular
Irons) and Compacted Graphite Irons (CGI) K3 High-Strength Ductile Irons and Austempered Ductile
Iron (ADI)
| N1 | Wrought Aluminium | AIMg1, AI99.5, AICuMg1, AICuBiPb, AIMgSi1, ALMgSiPb | |||||||
| N2 | Low-Silicon Aluminium Alloys and Magnesium Alloys | Si <12,2% | GAISiCu4, GDAISi10Mg | ||||||
| N3 | High-Silicon Aluminium Alloys and Magnesium Alloys | Si >12,2% | G-ALSi12, G-AlSi17Cu4, G-AISi21CuNiMg |
N4 Copper-, Brass-, Zinc-Based on Machinability Index
Range of 70–100
| N5 | Nylon, Plastics, Rubbers, Phenolics, Resins, Fibreglass | Lexan®, Hostalen™, Polystyrol, Makralon | ||||||
| N6 | Carbon, Graphite Composites, CFRP | CFK, GFK | ||||||
| N7 | Metal Matrix Composites (MMC) |
S1 X1NiCrMoCu32 28 7, X12NiCrSi36 16, X5NiCrAITi31 20,
Iron-Based, Heat-Resistant Alloys 500–1200 160–260 25–48
X40CoCrNi20 20
| S2 | Cobalt-Based, Heat-Resistant Alloys | 1000–1450 | 250–450 | 25–48 | Haynes® 188, Stellite® 6,21,31 | ||
| S3 | Nickel-Based, Heat-Resistant Alloys | 600–1700 | 160–450 | <48 | INCONEL® 690, INCONEL 625, Hastelloy®, Nimonic® 75 | ||
| S4 | Titanium and Titanium Alloys | 900–1600 | 300–400 | 33–48 | Ti1, TiAI5Sn2, TiAI6V4, TiAI4Mo4Sn2 |
H1 GX260NiCr42, GX330NiCr42, GX300CrNiSi952,
Hardened Materials 44–48
GX300CrMo153, Hardox® 400
| H2 | Hardened Materials | 48–55 | ||||
| H3 | Hardened Materials | 56–60 | ||||
| H4 | Hardened Materials | >60 |