Non-Water-Hardenable Steels
C40E – 1.1186 / 1040 / Ck40 / S40C / XC42H1 / 080M40 / CS40 / C40 / C35k / C40E4
C40E – 1.1186 steel grade belongs to the group of medium-carbon structural steels and is widely used as an engineering material in applications requiring strength and hardness. Although it is identified by different designations across various countries and standards, its fundamental properties remain largely similar. For example, it is known as C40E – 1.1186 in Europe, AISI 1040 in the United States, Ck40 in Germany, S40C in Japan, XC42H1 in France, and 080M40 or CS40 in the United Kingdom. These alternative names highlight the steel’s broad use in international manufacturing and engineering industries.
C40E steel typically contains approximately 0.37% – 0.44% carbon. This carbon content provides higher strength and hardness compared to low-carbon steels, while still maintaining adequate machinability and ductility. As a result, it offers a balanced performance in applications requiring both mechanical strength and production efficiency.
One of the key advantages of C40E steel is its excellent suitability for heat treatment processes. Through hardening and tempering, the mechanical properties of the material can be significantly improved. These processes enhance the steel’s hardness, wear resistance, and load-bearing capacity. In addition, surface hardening treatments can be applied to increase the durability of the outer layer.
C40E steel is an ideal material for components subjected to medium to high loads. It is widely used in machine manufacturing, the automotive industry, and general engineering applications. Its good machinability facilitates production processes while helping to maintain cost efficiency.
Thanks to its durability, heat treatment capability, and balanced mechanical properties, C40E – 1.1186 steel has a wide range of industrial applications. Its combination of performance and economic advantages makes it a preferred material in many engineering fields.
Main Application Areas
- Production of shafts, axles, and spindles
- Gears and transmission components
- Mechanical parts used in machinery manufacturing
- Various structural and mechanical components in the automotive industry
- Bolts, pins, and fastening elements
- Components designed for heat treatment hardening
- Medium and high load-bearing structural elements
- Pressed and formed metal components
- Durable components used in agricultural machinery
Thanks to these characteristics, C40E – 1.1186 and equivalent steel grades are widely preferred engineering materials that provide an effective balance between strength and machinability.
General Identity
C40E – 1.1186
| Grade | C40E |
| Number | 1.1186 |
| Classification | Quality Steel |
Equivalent Grades
C40E – 1.1186
| USA | 1040 |
| Germany, DIN | Ck40 |
| Japan, Jis | S40C |
| France, AFNOR | XC42H1 |
| England, BS | 080M40 CS40 |
| Italy, UNI | C40 |
| Spain, UNE | C35k F1130 |
| Russia, Gost | 40 |
| Inter, ISO | C40E4 |
Standards
C40E – 1.1186
| Standard 1 | EN 10277-5: 2008 |
| Standard 2 | EN 10083-2: 2006 |
| Standard 3 | EN 10132-3: 2000 |
Chemical Composition
C40E – 1.1186
| C | 0.37 – 0.44 |
| Si | max 0.40 |
| Mn | 0.50 – 0.80 |
| Ni | max 0.40 |
| P | max 0.030 |
| S | max 0.035 |
| Cr | max 0.40 |
| Mo | max 0.10 |
Mechanical Properties
C40E – 1.1186
| Nominal thickness (mm) | to 16 | 16 – 100 | 100 – 250 |
| Rm – Tensile strength (MPa) (+N) | 580 | 550 | 530 |
| Nominal thickness (mm) | 0.3 – 3 |
| Rm – Tensile strength (MPa) (+A) | 550 |
| Nominal thickness (mm) | 0.3 – 3 |
| Rm – Tensile strength (MPa) (+CR) | 970 |
| Nominal thickness (mm) | 5 – 10 | 10 – 16 | 16 – 40 | 40 – 63 | 63 – 100 |
| Rm – Tensile strength (MPa) (+C) | 700 – 1000 | 650 – 980 | 620 – 920 | 590 – 840 | 550 – 820 |
C40E – 1.1186
| Nominal thickness (mm) | to 16 | 16 – 100 | 100 – 250 |
Re – Upper yield strength or
Rp0.2 – 0.2% proof strength (MPa) (+N) | 320 | 290 | 260 |
| Nominal thickness (mm) | 0.3 – 3 |
| Rp0.2 0.2% proof strength (MPa) (+A) | 440 |
| Nominal thickness (mm) | 5 – 10 | 10 – 16 | 16 – 40 | 40 – 63 | 63 – 100 |
| Rp0.2 0.2% proof strength (MPa) (+C) | 540 | 460 | 365 | 330 | 290 |
C40E – 1.1186
| KV Impact energy (J) (+QT) | +20° – 30 |
| Nominal thickness (mm) | 0.3 – 3 |
| A – Min. elongation Lo=80mm (%) (+A) | 18 |
| Nominal thickness (mm): | 5 – 10 | 10 – 16 | 16 – 40 | 40 – 63 | 63 – 100 |
| A – Min. elongation at fracture (%) (+C) | 6 | 7 | 8 | 9 | 9 |
| Nominal thickness (mm) | to 16 | 16 – 100 | 100 – 250 |
| A – Min. elongation Lo=5,65 √ So (%) (+N) | 16 | 17 | 17 |
C40E – 1.1186
| Birinel hardness (HBW) (+SH): | 163 – 211 |
| Vikers hardness (HV) (+CR): | 280 |
| Vickers hardness (HV) (+A) | 170 |
