Tool steel NC7V4, 86CrMoV7, 1.2327, NC7VL, 9H2MF for cold working tools in metallurgy according to BN-68/0631-03.
| Standard | Steel Grade | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Chemical Composition % | |||||||||||
| C: | Mn: | Si: | P: | S: | Cr: | Mo: | V: | Ni: | Cu: | ||
| BN | NC7V1 | ||||||||||
| 0.80 - 0.90 | 0.20 - 0.50 | 0.20 - 0.40 | <0.03 | <0.03 | 0.60 - 0.90 | - | 0.05 - 0.15 | <0.25 | <0.25 | ||
| BN | NC7V2 | ||||||||||
| 0.80 - 0.90 | 0.20 - 0.50 | 0.20 - 0.40 | <0.03 | <0.03 | 1.00 - 1.30 | - | 0.05 - 0.15 | <0.25 | <0.25 | ||
| BN | NC7V3 | ||||||||||
| 0.80 - 0.90 | 0.20 - 0.50 | 0.20 - 0.40 | <0.03 | <0.03 | 1.40 - 1.70 | - | 0.05 - 0.15 | <0.25 | <0.25 | ||
| BN | NC7V4 | ||||||||||
| 0.75 - 0.85 | 0.20 - 0.50 | 0.20 - 0.40 | <0.03 | <0.03 | 1.70 - 2.00 | - | 0.05 - 0.15 | <0.25 | <0.25 | ||
| BN | NC7VL | ||||||||||
| 0.75 - 0.85 | 0.20 - 0.40 | 0.20 - 0.40 | <0.03 | <0.03 | 1.70 - 2.00 | 0.20 - 0.30 | 0.10 - 0.20 | <0.30 | <0.25 | ||
| DIN | 86CrMoV7 - 1.2327 | ||||||||||
| 0.83 - 0.90 | 0.30 - 0.45 | 0.15 - 0.35 | <0.03 | <0.03 | 1.60 - 1.90 | 0.20 - 0.35 | 0.05 - 0.15 | - | - | ||
| GOST | 9H2MF - 9Ch2MF - 9Х2МФ | ||||||||||
| 0.85 - 0.95 | 0.20 - 0.70 | 0.25 - 0.50 | <0.03 | <0.03 | 1.70 - 2.10 | 0.20 - 0.30 | 0.10 - 0.20 | <0.5 | <0.25 | ||
Tool steel NC7V4, NC7VL and 86CrMoV7, 1.2327
The stees from NC7V1 to NC7V4 and NC7VL acc. to BC are the grades with high hardenability and fracture toughness, which are designed for large-section tools for cold and hot working in the metallurgical industry. The above mentioned species are distinguished by, among others, the content of Chromium in chemical composition. The more Chromium, the better the product is for the larger work piece.
NC7 steels are used as semiconductors in the state of high temperature for the production of forged cold-rolling rolls with barrel diameters up to 700mm, resistance roll shirts, dies and other parts of hot and cold rolling mill. They differ from other tool steels in the chemical composition, which consists of Chromium, Vanadium, high carbon content, and in one species of Molybdenum especially.
- NC7V1 is used on forged rolls for cold-rolling with a barrel diameter of up to 100mm
- NC7V2 also used on forged rolls for cold-rolling with a barel section of 101 - 180mm
- NC7V3 also used on forged rolls for cold-rolling with a barel section of 181 - 260mm
- NC7V4 also used on forged rolls for cold-rolling with a barel section of 261 - 379mm
- NC7VL also used on forged rolls for cold-rolling with a barel section of 380 - 700mm
Mechanical properties
- Hardness of NC7V1 to NC7V4 steels in softened condition < 229 HB, after hardening and tempering min. of 62 HRC
- Hardness of NC7VL win softened condition < 248 HB, after hardening and tempering min. of 62 HRC
Heat treatment of NC7V1 to NC7V4 and NC7VL
- Softening annealing below Ac1 w temperature 690 - 710℃ with cooling in a box, ash or sand
- Softening annealing above Ac1 w temperature 750 - 770℃ with cooling in a furnace up to 600℃ with max. of 20℃/h
- Softening annealing above Ac1 at 750 - 770 ℃ with cooling with isothermal conversion at 670 - 710 ℃
- Hardening at 810 - 850℃ with cooling in oil
- Tempering at 100 ℃ in the air
Heat treatment (hardening and tempering) may vary depending on the application of the product, shape, cross-section. The data given above refer to typical end uses of the material.
In the above mentioned grades the company provides: