55NiCrMoV7 | DIN 1.2714 Hot Work Tool Steel
In the DIN 17350 standard,55NiCrMoV7/1.2714 steel is classified as hot working die steel.
55NiCrMoV7/1.2714 is similar to the American grade L6.Both of them have extreme toughness and good through hardening properties with very little size change after heat treatment.
They are used in the quenched and tempered conditon with high hardness 380-420HBW.
55NiCrMoV7/1.2714 is used for making forging dies,hot shear knives,punches,backing plate,die holders,hot punching tools.
55NiCrMoV7 | DIN 1.2714 Chemical Composition |
||||||||||
| National Standard |
Grade | C% | Si% | Mn% | Cr% | Mo% | Ni% | V% | P% | S% |
| DIN 17350 | 55NiCrMoV7 | 0.5-0.6 | 0.1-0.4 | 0.6-0.9 | 0.8-1.2 | 0.35-0.55 | 1.5-1.8 | 0.05-0.15 | ≤0.03 | ≤0.03 |
| AISI A681 | L6 | 0.65-0.75 | 0.2-0.4 | 055-0.85 | 0.65-0.85 | ≤0.25 | 1.25-1.75 | 0.2-0.3 | ≤0.03 | ≤0.03 |
| JIS G4404 | SKT4 | 0.5-0.6 | ≤0.4 | 0.5-0.8 | 0.5-0.8 | 0.15-0.3 | 1.4-1.8 | ≤0.2 | ≤0.03 | ≤0.03 |
| GB 1299 | 5CrNiMo | 0.5-0.6 | ≤0.4 | 0.5-0.8 | 0.6-0.9 | 0.15-0.3 | 1.4-1.8 | 0.07-0.1 | ≤0.03 | ≤0.03 |
55NiCrMoV7/1.2714 Steel Heat Treatment
Annealing For 55NiCrMoV7/1.2714
1.Annealing temperature:650-700°C
2.Cool slowly in the furance
3.Maximum Brinell hardness of 229
Quenching and Tempering(QT) For 55NiCrMoV7/1.2714
1.Quenching temperature:830-870°C for oil,830-890°C for air.
2.Hold at the temperature then quench in oil or air.
3.Tempering as soon as possible when the temperature low to ambient temperature
4.Heat uniformly to the required temperature allowing a soaking time of two hours per 25mm of ruling section.
5.A second tempering is highly recommended.
6.keep the material out of the furnace ,then cool in the air
| Tempering | ||||||
| Temperature | 200 | 250 | 300 | 400 | 500 | 600 |
| Hardness(HRC) | 55 | 54 | 53 | 49 | 45 | 39 |
| Tensile strength | 1910 | 1850 | 1790 | 1630 | 1490 | 1210 |
Stress Relieving For 55NiCrMoV7/1.2714
1.Stress relieving should be carried out by heating to 650-700°C to reduce distortion during heat treatment.
2.Cooling in furnace to 300-350°C
3.Cooling in air
55NiCrMoV7 Steel Mechanical Property in Quenched & Tempered Conditon
- Tensile Strength: 1200-1400MPa
- Yield Strength: 1000Mpa Min
- Elongation:15% Min
- Reduction: 50% Min
- Charpy Impact: 40J Min
- Hardness: 38-42HRC
Quality Certification for 55NiCrMOV7/ 1.2714
A material test report(Inspection Certificate EN 10204 3.1) will be provided, documenting the following:
1.Chemical analysis
2.Mechanical properties
3.Surface hardness
4.Non Metallic Inclusion
5.Heat Treatment Process
6.Grain size
7.Forging ratio
8.NDE test method/criteria
Supply Size & Condition For 55NiCrMoV7/1.2714
- Round Bars: Dia.80 – 1,000mm as Forged
- Flat / Square Bars: Thickness Max.800mm
- Shafts, Rollers, Blocks: Customized or According to Drawing
- Rolled Round Bars: Dia.14 – 130mm with UT Assurance
Heat treatment:Quenched and Tempered (+QT), Normalizing (+N), Annealing (+A)
Surface finish:Black / Rough turned / Peeled
55NiCrMoV7/1.2714 hot work tool steel manufacturers and suppliers, supplied in round rods,square/flat bars,rollers,shafts,blocks and forging pieces.
