86CrMoV7 / 1.2327
Cold Working Tool Steel
1. Steel description and applications
86CrMoV7 / 1.2327 steels are grades with high hardenability and fracture toughness, designed for large-section tools for cold and hot working in the metallurgical industry. They are distinguished by their Chromium content, making them suitable for larger workpieces.
Used for forged cold-rolling rolls (up to 700mm), resistance roll shirts, dies, and other parts of hot & cold rolling mills.
Recommended applications:- Cold working rolls and back-up rolls
- Straightening rolls
- Cold plate leveller rolls
2. Chemical Composition (%)
| C | Mn | Si | P | S | Cr | Mo | V |
|---|---|---|---|---|---|---|---|
| 0.83–1.00 | 0.30–0.60 | 0.15–0.35 | <0.03 | <0.03 | 0.90–1.60 | 0.45–0.90 | 0.05–0.15 |
3. Mechanical Properties
| Tensile Strength (Rm) | Yield Strength (Rs) | Elongation (A) | Hardness |
|---|---|---|---|
| 900–1050 N/mm² | ≥ 750 N/mm² | ≥ 13% | <229 HB (soft) / ≥62 HRC (hardened) |
Reduction Ratio: ≥ 4:1
Inclusions: ASTM E45 st.D (max type A,B,C,D = 2.0; T max = 1.5)
Austenitic Grain: ASTM E112 ≥ 5
Ultrasonic Test: SEP 1921, class D/d
4. Heat Treatment
- Soft annealing below Ac1: 690–710°C, cooled in box/ash/sand
- Soft annealing above Ac1: 750–770°C, furnace cooled to 600°C (≤20°C/h)
- Isothermal conversion: 670–710°C
- Hardening: 810–850°C, cooling in oil
- Tempering: 100°C in air