51CrV4 / 50CrV4 / 1.8159, 58CrV4, 59CrV4 and AISI 6150 spring alloy construction steel for springs and spring elements after tempering and hardening according to EN 10250-3, EN 10083-3, EN 10277-5.
| Standards | Steel Grades | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Chemical Composition (%) | |||||||||
| C: | Mn: | Si: | P: | S: | Cr: | Ni: | V: | Cu: | |
| DIN | 58CrV4 - 58 CrV 4 - 1.8161 | ||||||||
| 0.55 - 0.62 | 0.7 - 1.1 | 0.15 - 0.40 | <0.035 | <0.035 | 0.9 - 1.2 | - | 0.1 - 0.2 | - | |
| DIN | 59CrV4 - 59 CrV 4 - 1.2242 | ||||||||
| 0.55 - 0.62 | 0.8 - 1.1 | 0.15 - 0.35 | <0.035 | <0.035 | 0.9 - 1.2 | - | 0.07 - 0.12 | - | |
| PN | 50HF | ||||||||
| 0.46 - 0.54 | 0.5 - 0.8 | 0.15 - 0.40 | <0.030 | <0.030 | 0.8 - 1.1 | <0.4 | 0.1 - 0.2 | <0.25 | |
| EN | 51CrV4 - 51 CrV 4 - 1.8159 | ||||||||
| 0.47 - 0.55 | 0.7 - 1.1 | <0.40 | <0.035 | <0.035 | 0.9 - 1.2 | - | 0.10 - 0.25 | - | |
| EN | 50CrV4 - 50 CrV 4 | ||||||||
| 0.47 - 0.55 | 0.7 - 1.1 | <0.40 | <0.025 | <0.025 | 0.9 - 1.2 | - | 0.10 - 0.25 | - | |
| ASTM | AISI 6150 - UNS G61500 | ||||||||
| 0.48 - 0.53 | 0.7 - 0.9 | 0.15 - 0.35 | <0.035 | <0.040 | 0.8 - 1.1 | - | >0.15 | - | |
| GOST | 50HFA - 50ChFA - 50KhFA - 50ХФА | ||||||||
| 0.46 - 0.54 | 0.5 - 0.8 | 0.17 - 0.37 | <0.025 | <0.025 | 0.8 - 1.1 | <0.25 | 0.1 - 0.2 | <0.2 | |
51CrV4 / 1.8159, 58CrV4 / 1.8161, 59CrV4 / 1.2242 - specification and application
50HF and DIN / EN equivalent alloys are structural alloys used in the engineering industry for heavy-duty spring components and oil hardened springs.
The steel, unlike other carbon and alloy grades, is characterized by high hardness, low vulnerability to tempering, resistance for variable and heavy loads, and the ability to operate at elevated temperatures up to 300 ℃. Surface-hardened, retains excellent strength properties of the core while maintaining sufficient surface hardness.
58CrV4 / 1.8161 and 59CrV4 / 1.2242 are related grades with the same range of alloying additives. It is distinguished by the higher carbon content, which makes it possible to achieve even higher hardness after heat treatment.
51CrV4 / 50CrV4 / 58CrV4 / 59CrV4 grades are supplied as hot-rolled bars, drawn bars, wires, spring stripes, forgings are used for the production of heavy-duty springs, axles, crankshafts, connecting rods, compression springs, valve springs, springs, shock absorbers or spring washers.
It is mainly supplied in an annealed, softened, heat-treated and raw conditions. Steel does not exhibit corrosion resistance, so products should be protected with greases or coatings.
Mechanical properties for light bars in accordance with EN 10277-5
- Delivery condition +SH or +A+SH
- Dimensions <80mm
- Hardness: <248 HB
- Delivery condition +C+QT
- Dimensions <16mm
- Tensile strength, Rm: 1100 - 1300 MPa
- Yield point, Re: >900 MPa
- Elongation, A: > 9%
- Dimensions 16 - 40mm
- Tensile strength, Rm: 1000 - 1200 MPa
- Yield point, Re: >800 MPa
- Elongation, A: >10%
- Przekroje 40 - 80mm
- Tensile strength, Rm: 900 - 1100 MPa
- Yield point, Re: >700 MPa
- Elongation, A: >12%
- Delivery condition +A+C
- Dimensions <16mm - Hardness: <311 HB
- Dimensions 16-40mm - Hardness <293 HB
- Dimensions 40-80mm - Hardness <287 HB
Mechanical properties of hot-rolled bars according to EN 10089
- After hardening at 850 ℃ in oil and tempering at 450 ℃
- Tensile strength, Rm: 1350 - 1650 MPa
- Yield point, Re: >1200 MPa
- Elongation, A: >6%
- Contraction, Z: >30%
- Impact resistance, KU: >8 J
- Delivery condition +S - Hardness: <280 HB
- Delivery condition +A:- Hardness: <248 HB
- Delivery condition +AC - Hardness: <230 HB
Mechanical properties of cold-rolled spring strips according to EN 10132-4
- Delivery condition +A+LC
- Tensile strength, Re: <700 MPa
- Yield point, Re: <550 MPa
- Elongation, A: >13%
- HV Hardness: <220
- HRB Hardness: <94
- Delivery condition +QT
- Yield point, Re: 1200 - 1800 MPa
- HRC Hardness: 38,5 - 52,5
- HV Hardness: 370 - 550
Mechanical properties for forged products in accordance with EN 10250-3
After hardening at 820 - 860 ℃ and tempering at 540 - 680℃
- Properties of longitudinal samples with dimensions of <160mm
- Tensile strength, Rm > 800 MPa
- Yield point, Re: > 600 MPa
- Elongation, A: >13%
- Impact resistance, KV20℃: >30 J
- Properties of transverse samples with dimensions of <160mm
- Tensile strength, Rm > 800 MPa
- Yield point, Re: >600 MPa
- Elongation, A: > 9%
- Impact resistance, KV20℃: >16 J
Mechanical properties of hot-rolled products according to EN 10083-3
- Round products with a dimensions of <16mm and flat with a thickness of <8mm
- Tensile strength, Rm: 1100 - 1300 MPa
- Yield point, Re: >900 MPa
- Elongation, A: 9-40%
- Contraction, Z: >45%
- Round products with a dimensions of 16-40mm and flat with a thickness of 8-20mm
- Tensile strength, Rm: 1000 - 1200 MPa
- Yield point, Re: >800 MPa
- Elongation, A: 10%
- Contraction, Z: >45%
- Impact resistance, KV20℃: >30J
- Round products with a dimensions of 40-100mm and flat with a thickness of 20-60mm
- Tensile strength, Rm: 900 - 1100 MPa
- Yield point, Re: >700 MPa
- Elongation, A: 12%
- Contraction, Z: >50%
- Impact resistance, KV20℃: >30J
- Round products with a dimensions of 100-160mm and flat with a thickness of 60-100mm
- Tensile strength, Rm: 850 - 1000 MPa
- Yield point, Re: >650 MPa
- Elongation, A: 13%
- Contraction, Z: >50%
- Impact resistance, KV20℃: >30J
- Round products with a dimensions of >160mm and flat with a thickness of >100mm
- Tensile strength, Rm: 800 - 950 MPa
- Yield point, Re: >600 MPa
- Elongation, A: 13%
- Contraction, Z: >50%
- Impact resistance, KV20℃: >30J
In the above mentioned grades the company provides:
- Hot-rolled bars and flat bars
- Spring plates and sheets
- Drawn and bright bars
- Forgings and forged bars
- Cold-rolled spring stripes
- Drawn wires
Other designations of 50HF grade:
51CrV4, 51 CrV 4, 50CrV4, 50 CrV 4, 50CV4, 50 CV 4, 58CV4, 58 CV 4, CSN 15261, 60Cr4V2, 49CrV3-2, 51CrV4 mod. Q, 51CrV4H, 51CrV4HH, 51CrV4HL, 51CrV6, CrV3Z, druty FDCrV-A, druty TDCrV-A, druty VDCrV-A, 51VCr11A, F-143, 10C2V B, AISI 6150, UNS G61500, UNS H61500, UNS H61504, 50HFA, 50ChFA, 50KhFA, 50ХФА, 51CrMoV4, 1.7701, 1.8159, 1.8161, 1.2242, 50CrVA.