Properties of T7 and T7A tool steel
T7 tool steel and T7A steel are types of Chinese tool steel, hardness HBW ≤187 (after annealing). After heat treatment (quenching or tempering), T7 tool steel can obtain higher strength and toughness, and corresponding hardness, but low hardenability, quenching deformation and low thermal hardness.
T7 tool steel applications
T7 tool steel is used to make various tools that withstand impact, vibration load, good toughness, medium hardness and low cutting capacity, such as small pneumatic tools, chisel and saw for woodworking, stamping, forging die and setting tools (hammer head), lathe thimble, drill, scissors, etc.
Chemical Composition of T7 Tool Steel
| Steel Grade | W% | Si (≤) | Mn (≤) | P(≤) | S (≤) | V (≤) | Cr (≤) | Ni (≤) | Cu (≤) | Mo (≤) | W (≤) |
| T7 | 0.65 – 0.74 | 0.35 | 0.40 | 0.035 | 0.030 | 0.02 | 0.25 | 0.20 | 0.25 | 0.20 | 0:30 |
| T7A | 0.65 – 0.74 | 0.35 | 0.40 | 0.030 | 0.020 | 0.02 | 0.25 | 0.20 | 0.25 | 0.20 | 0:30 |
T7 tool steel hardness
Steel delivery state hardness value and sample quenching hardness value
| Note | Delivery condition | HBW hardness |
| T7 tool steel | Anneal | ≤187 |
| Cold drawing after annealing | ≤241 |
| Note | Quenching sample (quenching temperature and coolant) | HRC hardness |
| T7 tool steel | 800°C – 820°C, Water | ≥62 |
