56Si7, 46Si7, 48Si7, 38Si7 - spring steel
Silicon spring steel 56Si7, 55Si7, 1.5025, 1.5026 for leaf spring and heavy-duty spring according to PN-74/H-84032, EN 10089, EN 10132-4.
| Standard | Steel Grade | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Chemical Composition % | |||||||||
| C: | Mn: | Si: | P: | S: | Cr: | Ni: | Mo: | Cu: | |
| PN | 55S2 | ||||||||
| 0.52 - 0.60 | 0.6 - 0.9 | 1.5 - 1.8 | <0.040 | <0.040 | <0.3 | <0.4 | - | <0.25 | |
| PN | 50S2 | ||||||||
| 0.47 - 0.55 | 0.6 - 0.9 | 1.5 - 1.8 | <0.040 | <0.040 | <0.3 | <0.4 | - | <0.25 | |
| PN | 40S2 | ||||||||
| 0.35 - 0.42 | 0.6 - 0.8 | 1.5 - 1.9 | <0.040 | <0.040 | <0.3 | <0.4 | - | <0.25 | |
| EN/DIN | 56Si7 - 55Si7 - 1.5026 | ||||||||
| 0.52 - 0.60 | 0.6 - 0.9 | 1.6 - 2.0 | <0.025 | <0.025 | - | - | - | - | |
| EN/DIN | 50Si7 - 51Si7 - 1.5025 | ||||||||
| 0.47 - 0.55 | 0.5 - 0.8 | 1.5 - 2.0 | <0.040 | <0.040 | - | - | - | - | |
| EN/DIN | 46Si7 - 1.5024 | ||||||||
| 0.42 - 0.50 | 0.5 - 0.8 | 1.5 - 2.0 | <0.040 | <0.040 | - | - | - | - | |
| EN | 48Si7 - 1.5021 | ||||||||
| 0.45 - 0.52 | 0.5 - 0.8 | 1.6 - 2.0 | <0.025 | <0.025 | <0.4 | <0.4 | <0.1 | - | |
| EN/DIN | 38Si7 - 1.5023 | ||||||||
| 0.35 - 0.42 | 0.5 - 0.8 | 1.5 - 1.8 | <0.025 | <0.025 | - | - | - | - | |
| GOST | 55С2 | ||||||||
| 0.52 - 0.60 | 0.6 - 0.9 | 1.5 - 2.0 | <0.035 | <0.035 | <0.3 | <0.25 | - | <0.20 | |
| GOST | 40С2 | ||||||||
| 0.39 - 0.45 | 0.6 - 0.9 | 1.5 - 1.8 | <0.020 | <0.012 | <0.2 | <0.2 | - | <0.20 | |
Stal 55S2, 50S2, 56Si7, 55Si7, 1.5026 - specifications and application
Silicon spring steel is one of the most popular, simple, basic and at the same time the longest used grades in the production of spring elements and springs in the automotive industry and railroading.
Silicon steels are characterized by high strength properties, low ductility, resilience, susceptibility to decarburization, resistance to medium loads, low hardenability, and difficult welding.
55S2, 50S2, 40S2 steels, as well as replacements EN/DIN 56Si7, 50Si7, 46Si7 have similar concentrations of alloy additives - including Silicon, which is responsible for the resilience of steel. Differences in grades result from the concentration of carbon, responsible for obtaining the appropriate hardness after heat treatment.
Silicon steel, found mainly in the form of round bars and hot rolled flat bars, is used for the production of spiral, disk, bumper, cone, coil and flat springs, springing rings and spring washers, springs for cultivators, springs of steam locomotives, personal and goods wagons, flat vehicle springs rail, spring plates, safety valve springs and check valves.
Mechanical properties of 56Si7, 55Si7, 1.5026 according to EN 10089
- Tensile strength, Rm: 1450 - 1750 MPa
- The yield point, Re: > 1300 MPa
- Elongation, A:> 6%
- Impact resistance, KV: > 13J
- Hardness in +S condition: <280 HBW
- Hardness in +A condition: : <248 HB
- Hardness in +AC condition: : <230 HB
Mechanical properties of 46Si7, 1.5024 according to EN 10089
- Tensile strength, Rm: 1400 - 1700 MPa
- The yield point, Re: > 1250 MPa
- Elongation, A:> 7%
- Contraction, Z: >30%
- Impact resistance, KV: > 15J
- Hardness in +S condition: <280 HBW
- Hardness in +A condition: : <248 HB
- Hardness in +AC condition: : <230 HB
Mechanical properties of 48Si7, 1.5021 according to EN 10132-4
- Delivery condition +A+LC
- Tensile strength, Rm: <720 MPa
- The yield point, Re: <580 MPa
- Elongation, A:> 13%
- Hardness HV: <225
- Hardness HRB: <95
- Delivery condition +QT
- Tensile strength, Rm: 1200 - 1700 MPa
- Hardness HRC: 38,5 - 50,5
- Hardness HV: 370 - 520 HB
Mechanical properties of 38Si7, 1.5023 according to EN 10089
- Tensile strength, Rm: 1300 - 1600 MPa
- The yield point, Re: > 1150 MPa
- Elongation, A:> 8%
- Contraction, Z: >35%
- Impact resistance, KV: > 15J
- Hardness in +S condition: <280 HBW
- Hardness in +A condition: : <217 HB
- Hardness in +AC condition: : <200 HB
Substitutes, equivalents and other species designations
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