C125S, 1.1224, XC125 - Spring low-alloy carbon steel for heat treatment - hardening in oil, according to EN 10132-4 i EN 10270-1.
| Standard | Steel grade | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Chemical Composition % | ||||||||||
| C: | Mn: | Si: | P: | S: | Cr: | Mo: | Ni: | Al: | Cu: | |
| EN/DIN | C125S - 1.1224 - C 125 S | |||||||||
| 1.20 - 1.30 | 0.30 - 0.60 | 0.15 - 0.35 | <0.025 | <0.025 | <0.40 | <0.1 | <0.40 | - | - | |
| AFNOR | C125RR - C 125 RR - XC125 - XC 125 | |||||||||
| 1.20 - 1.30 | 0.30 - 0.60 | 0.15 - 0.30 | <0.025 | <0.020 | <0.30 | <0.1 | <0.40 | <0.03 | - | |
| IS | 115C5 | |||||||||
| 1.10 - 1.20 | 0.40 - 0.60 | 0.10 - 0.35 | <0.04 | <0.04 | <0.20 | - | - | <0.25 | - | |
| EN/DIN | 125Cr1 - 125 Cr 1 - 125Cr2 - 125 Cr 2 - 1.2002 - 2002 | |||||||||
| 1.20 - 1.30 | 0.25 - 0.40 | 0.15 - 0.35 | <0.025 | <0.025 | 0.40 - 0.60 | <0.1 | <0.40 | - | - | |
| AFNOR | C120E3UCr4 - Y2 120 C | |||||||||
| 1.10 - 1.29 | 0.10 - 0.40 | 0.10 - 0.30 | <0.025 | <0.025 | 0.20 - 0.50 | - | - | - | - | |
| AFNOR | XC130 - XC 130 | |||||||||
| 1.20 - 1.35 | 0.30 - 0.45 | 0.20 - 0.35 | <0.030 | <0.025 | 0.20 - 0.50 | - | - | - | - | |
| JIS | SKS 81 - SKS81 - SKS 81 M - SKS81M - TE-2 | |||||||||
| 1.10 - 1.30 | <0.50 | <0.35 | <0.030 | <0.030 | 0.20 - 0.50 | - | <0.25 | <0.25 | ||
Steel C125S, 1.1224 - implementation and specification
Non-alloy carbon spring steel is used for leaf springs and springs with small cross-sections. It is characterized by low hardenability and high carbon range in relation to C90S, C75S, C85S, and C67S steel. Designed for spring elements requiring high elasticity and hardness.
It does not show corrosion resistance, and during heat treatment it is exposed to decarburization and oxidation, which means that the material should be protected against treatment using a protective atmosphere. Poorly carried out treatment is associated with reduced fatigue strength.
Products made of C125S steel and its equivalents are produced in the form of flat semi-finished products - cold rolled strips, small-format thin sheets. Tempering of C125S steel is carried out in oil, and after tempering the product shows the structure of tempered martensite.
Products made of C125S steel are characterized by high tensile strength and yield strength. Thermal improvement consists in austenitising the product at a temperature of 780 - 860 and tempering at a temperature of 350 - 500 ℃.
Mechanical properties of steel C125S (1.1224)
| Mechanical properties | ||||
|---|---|---|---|---|
| The softened condition after smoothing rolling C125S +A+LC | ||||
| Tensile strength | Rm | < 740 MPa | ||
| The yield point | Re | < 600 MPa | ||
| Elongation | A | > 11% | ||
| Hardness | HV | HRB | < 230 HV | < 97 HRB |
| Cold-rolled condition C125S +CR | ||||
| Tensile strength | Rm | < 1200 MPa | ||
| Hardness | HV | < 325 HV | ||
| Heat-treated condition C125S +QT | ||||
| Tensile strength | Rm | 1200 - 2100 MPa | ||
| Hardness | HV | HRC | 370 - 630 HV | 38.5 - 57.0 HRC |
In the grade of 1.1224 C125S, the company offers:
- Cold-rolled spring strips C125S, 1.1224
- Blanks and belts cut from strips C125S, 1.1224
- Thin sheets in the C125S grade or equivalent
The list of equivalents and other designations of C125S, (1.1224) steel:
C 125 S, C125RR, C 125 RR, XC125, XC 125, 115C5, 125Cr1, 125 Cr 1, 125Cr2, 125 Cr 2, 1.2002, 2002, C120E3UCr4, Y2 120 C, XC130, XC 130, SKS 81, SKS81, SKS 81 M, SKS81M, TE-2