51CrV4/DIN 1.8159 steel Manufacturer and Exporter,supplied with round,square,flat,block,and shaft etc.
51CrV4 /DIN 1.8159 is a Medium carbon alloy spring steel as per European Standard EN10083.It has good mechanical properties and process properties with high hardenability.In addition, the addition of vanadium element refines the grains,reduces the overheating sensitivity, improves the strength and toughness.
51CrV4 steel has high fatigue strength and high yield ratio.When the operating temperature is 300℃, its elasticity can still be maintained. The cutting performance is still good,but the plasticity is low during cold deformation,and the weldability is poor.
51CrV4/DIN 1.8159 STEEL SUPPLY FORM & SIZE & TOLERANCE
Hot Forged Round bar:Φ80-Φ1000mm
Hot Rolled Round bar:Φ16-Φ130mm
Hot Forged Square bar: Max Thickness:500mm
Flat bar/Blcoks:Thickness :120-800mm ,Width:120-1500mm
| Surface Finish | Black-Forged | Black-Rolled | Turned | Grinding | Polished | Peeled | Cold Drawn |
| Tolerance | (0，+5mm) | (0，+1mm) | (0，+3mm) | Best h9 | Best h11 | Best H11 | Best H11 |
WHAT IS SPRING STEEL?
Spring Steel refers to special special steel for manufacturing various springs and other elastic components.The main requirement of spring steel is to have good elasticity, and the elasticity of steel depends on its ability to elastically deform, that is, within a specified range, the ability to elastically deform can make it bear a certain load. When the load is removed, the material permanent deformation will not occur.
The spring mainly plays the role of support, shock absorption, buffering, measurement, control and storage, output capacity, etc. It mainly bears shock, vibration or long-term alternating stress, and the service environment is the atmosphere, water and other media.
Basic Performance Requirements
- High Elastic Limit,Yield Strength,Yield Ratio
- High Fatigue Strength
- Sufficient Toughness & Certain Plasticity
- Good Surface Quality
Process Performance Requirements
- Good Formability & Hardenability
- Low Overheating Sensitivity
- Low Surface Decarburization Tendency
Spring Steel Main Classification
- Carbon Spring Steel
Carbon spring steel has the advantages of low cost, convenient source of raw materials and wide range of uses.The disadvantage is that the hardenability and yield strength are low.If the carbon content is increased, although the strength and elastic limit can be increased, it will reduce the impact toughness and plasticity, especially the low temperature toughness.
The carbon content of carbon spring steel is generally 0.62%~0.90%, and the common spring steel grades are as below:
USA: AISI 1065, AISI 1070, AISI 1086
Japan:SUP 2, SUP 3
Germany: CK67, CK85
- Alloy Spring Steel
Alloy spring steel is based on carbon steel, appropriately adding one or several alloying elements to improve the mechanical properties, hardenability and other properties of steel to meet the performance required for manufacturing various springs
The basic series of alloy spring steel are as follows：
Silicon manganese spring steel
Typical Grades：AISI 9255,AISI 9260,SUP 6,SUP 7,54SiCr6,60SiCr7
Chrome manganese spring Steel
Typical Grades：AISI 5155,AISI 5160,SUP 9,55Cr3
Chrome vanadium spring steel
Typical Grades: AISI 6150,SUP 10,51CrV4
51CrV4/DIN 1.8159 STEEL CHEMICAL COMPOSITION
| Grade | C | Si | Mn | P | S | Cr | Mo |
| 51CrV4/1.8159 | 0.47-0.55 | ≤0.4 | 0.7-1.1 | ≤0.035 | ≤0.035 | 0.9-1.2 | 0.10-0.25 |
| 6150 | 0.48-0.53 | 0.15-0.35 | 0.7-0.9 | ≤0.035 | ≤0.04 | 0.8-1.1 | ≥0.15 |
51CrV4/DIN 1.8159 STEEL RELATED STANDARD & EQUIVALENT GRADE
China/GB 3077: 50CrVA
USA/ASTM A29: 6150
Japan/JIS G4801:SUP 10
UK/BS 1429:735A50
51CrV4/DIN 1.8159 STEEL FORGING
- Initial Forging Temperature：1180℃
- Final Forging Temperature：850℃
- Forging Ratio：above 4:1
- Post-Forging Treatment: 51CrV4 Steel should be cooled as slowly as possible after forged.As a white point sensitive steel,the recommended method is to do furnace annealing after forged.
51CrV4/DIN 1.8159 STEEL OPERATING TEMPERATURE
Allowable maximum operating temperature：250-300℃
51CrV4/DIN 1.8159 STEEL HEAT TREATMENT
- High Temperature Tempering（softening）：640-700℃
- Stress Relief Tempering
| Heating temperature，℃ | Cooling | |
| Hot Rolled Spring | 400-500 | Water/Oil |
| Cold Drawn Spring Wire | 315-370 | Air |
- Normalizing:850-880℃
- Annealing: 810-870℃
51CrV4 Steel Mechanical Properties in Normalizing and Annealing Conditon
| Tensile Strength | Yield Strength | Elongation | Reduction of Area | Impact Charpy-V | Hardness | |
| Normalizing | 770Mpa | 550Mpa | 20% | 63% | 36 | 288HBW |
| Annealing | 680Mpa | 450Mpa | 24% | 63% | 70 | 197HBW |
- Quenching:850-890℃,Oil quench
- Tempering:400-500℃
51CrV4 Steel Tempering Temperature Vs Hardness
| Grade | Quenching | Tempering Temperature,ºC | ||||||||
| Temperature,ºC | Hardness | 150ºC | 200ºC | 300ºC | 400ºC | 500ºC | 550ºC | 600ºC | 650ºC | |
| 51CrV4 | 860ºC | 56-62 | 56 | 55 | 51 | 45 | 39 | 35 | 31 | 28 |
51CrV4 Steel Mechanical Property with Quenched and Tempered Condition
| Quenching Temperature | Quenching Medium | Tempering Temperature | Tensile Strength Mpa | Yield Strength Mpa | Elongation % | Reduction % | Charpy Impact J |
| 850ºC | Oil | 500ºC | ≥1300 | ≥1150 | ≥10 | ≥40 | / |
51CrV4/DIN 1.8159 STEEL APPLICATION
51CrV4 steel is used as a particularly important coil spring of various sizes that is subject to high stress, and can also be used as an important spring with large cross-section and working below 300 ° C, such as various valve springs, fuel injector springs
