The main properties of a spring steel are those of bearing an intermittent load, accumulating energy and measuring forces.
It must have an elastic deformation without plastic alteration, so the yielding unit load shall be elevated and this is achieved after an adequate quenching and tempering.
Spring steels must have an elevated hardenability, verified with the Jominy hardenability that allows to calculate martensite at heart that you can obtain, which has to be at least 80%.
In order to get a better elasticity and a high elastic limit, spring steels must have a fine grain to be less sensible to overheating.
They must have an elevated tensile strength and fatigue strength, combined with plastic reserve, consequently toughness is diminished.
Inclusions and superficial defects have to remain within restricted limits. Steels with SI, CR and NI have an elevated elastic limit and a great hardenability. They are employed for springs and twist bars.
Case-hardening steels (EN 10085)
The main properties of a spring steel are those of bearing an intermittent load, accumulating energy and measuring forces.
It must have an elastic deformation without plastic alteration, so the yielding unit load shall be elevated and this is achieved after an adequate quenching and tempering.
Spring steels must have an elevated hardenability, verified with the Jominy hardenability that allows to calculate martensite at heart that you can obtain, which has to be at least 80%.
In order to get a better elasticity and a high elastic limit, spring steels must have a fine grain to be less sensible to overheating.
They must have an elevated tensile strength and fatigue strength, combined with plastic reserve, consequently toughness is diminished.
Inclusions and superficial defects have to remain within restricted limits. Steels with SI, CR and NI have an elevated elastic limit and a great hardenability. They are employed for springs and twist bars.
52SiCrNi5 (1.7117)
EN 10089
Annealed (+A) / Spheroidal Annealed (+AC)
PROPRIÉTÉS ET UTILISATIONS
52SiCrNi5 is a special alloy steel designed for the production of wrought components. This steel grade has a very low density and melting point and is applied in statically loaded small to medium-size springs. Steel grade 52SiCrNi5 presents an improved option when compared to 51CrV4. 52SiCrNi5 special alloy steel's favorable properties make it a versatile material for creating numerous parts and products. Typical applications include: Turbine fasteners / Connecting rods / Bolts / Nuts / Gear shafts
CORRESPONDENCE TO INTERNATIONAL DESIGNATIONS
| QUALITY | EUROPE | GERMANY | FRANCE | SPAIN | G.B. | USA | |
|---|---|---|---|---|---|---|---|
| EN | DIN | W.n. | AFNOR | UNE | B.S. | AISI/SAE | |
| 52SiCrNi5 | 52SiCrNi5 | 52SiCrNi5 | 1.7117 | ||||
CHEMICAL COMPOSITION % (UNI 3545)
| STEEL DESIGNATION | CHEMICAL COMPOSITION | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| SYMBOLIC | NUMERIC | C | Si | Mn | P max | S max | Cr | Mo | Ni | V |
| 52SiCrNi5 | 1.7117 | 0,49 ÷ 0,56 | 1,20 ÷ 1,50 | 0,70 ÷ 0,90 | 0,035 | 0,035 | 0,70 ÷ 1,00 | - | 0,50 ÷ 0,70 | - |
MECHANICAL CHARACTERISTICS (UNI 3545)
| STEEL | 10mm | |||
| SYMBOLIC | NUMERIC | Re min | Rm | A min |
| N/mm2 | % | |||
| 52SiCrNi5 | 1.7117 | 1220 | 1400 to 1650 |
5 |
JOMINY HARDENABILITY (UNI 3545)
| STEEL DESIGNATION | RANGE LIMITS | HRC HARDNESS MEASURED FROM THE QUENCHED END OF THE TEST TUBE (MM) | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SYMBOLIC | NUMERIC | 1,5 | 3 | 5 | 7 | 9 | 11 | 13 | 15 | 20 | 25 | 30 | 35 | 40 | |
| 52SiCrNi5 | 1.7117 | max | 63 | 63 | 63 | 62 | 62 | 62 | 61 | 61 | 60 | 59 | 57 | 56 | 54 |
| min | 56 | 56 | 55 | 55 | 54 | 53 | 52 | 51 | 47 | 42 | 38 | 35 | 33 | ||
USUALLY AVAILABLE ON STOCK
| M.T. COLORATION | QUALITY | HEAT TREATMENT | SURFACE | DIAMETER (mm) |
|---|---|---|---|---|
| 52SiCrNi5 | Spheroidal annealed | rolled | 20-300 |
 |
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