Water-Quenched Spring Steels
C125S – 1.1224 / C125RR
C125S – 1.1224 steel grade belongs to the group of high-carbon special structural steels and is commonly used in applications requiring very high hardness and excellent wear resistance. This steel may appear under different designations depending on the standard, such as C125S or C125RR. Due to its high carbon content, the steel has excellent hardenability, and very high mechanical properties can be achieved through appropriate heat treatment processes.
C125S steel typically contains approximately 1.20% – 1.30% carbon. This very high carbon content provides the material with high hardness and strong resistance to wear. When the steel is hardened, its surface becomes extremely hard and capable of withstanding friction and abrasive conditions. For this reason, it is widely used in components that require cutting performance or are exposed to intensive mechanical wear.
This steel grade responds well to hardening and tempering treatments. Hardening increases the overall hardness of the material, while tempering reduces brittleness and results in a more balanced mechanical structure. However, due to its very high carbon content, C125S steel can be more brittle compared to lower carbon steels. Therefore, proper heat treatment and careful engineering design are essential when selecting this material for specific applications.
C125S steel is generally produced in bar, strip, or plate form and is used in many technical applications where high hardness and wear resistance are critical. It is particularly suitable for cutting tools, spring systems, and mechanical components exposed to heavy wear.
In many industrial applications, durability and resistance to wear are key performance factors. Thanks to these properties, C125S – 1.1224 steel stands out as a reliable material for high-performance engineering components. When properly heat treated, it can provide extremely hard, durable, and long-lasting parts.
Main Application Areas
- Cutting tools and knife manufacturing
- Hand tools and durable metal equipment
- Wear-resistant machine components
- Springs and elastic metal elements
- Lock mechanisms and spring-loaded systems
- Hard metal parts used in agricultural machinery
- Durable metal components used in measuring instruments
- Industrial cutting and drilling equipment
- Various machine components requiring high hardness
Thanks to these properties, C125S – 1.1224 and equivalent steel grades are widely preferred engineering materials in industrial applications requiring very high hardness and superior wear resistance.
General Identity
C125S – 1.1224
| Grade |
C125S |
| Number |
1.1224 |
| Classification |
Steel |
Equivalent Grades
C125S – 1.1224
| Germany, DIN |
— |
| France, AFNOR |
C125RR |
| England, BS |
— |
Standards
C125S – 1.1224
| Standard 1 |
EN 10132-4:2000 |
Chemical Composition
C125S – 1.1224
| C |
1.20 – 1.13 |
| Si |
0.15 – 0.35 |
| Mn |
0.30 – 0.60 |
| Ni |
max 0.40 |
| P |
max 0.025 |
| S |
max 0.025 |
| Cr |
max 0.40 |
| Mo |
max 0.10 |
Mechanical Properties
C125S – 1.1224
| Nominal thickness (mm) |
0.3 – 3 |
| Rm – Tensile strength (MPa) (+A) |
740 |
| —– |
—– |
| Nominal thickness (mm) |
0.3 – 3 |
| Rm – Tensile strength (MPa) (+CR) |
1200 |
| —– |
—– |
| Nominal thickness (mm) |
0.3 – 3 |
| Rm – Tensile strength (MPa) (+OT) |
1200 – 2100 |
| —– |
—– |
| Nominal thickness (mm) |
0.3 – 3 |
| Rp0.2 0.2% proof strength (MPa) (+A) |
600 |
| —– |
—– |
| Nominal thickness (mm) |
0.3 – 3 |
| A – Min. uzama Lo = 80 mm (%) (+A) |
11 |
| —– |
—– |
| Vikers hardness (HV): (+A) |
230 |
| Vikers hardness (HV): (+CR) |
325 |
| Vikers hardness (HV): (+QT) |
370 – 630 |
