Aço ferramenta T7, composição química, propriedades e equivalente T7A

T7 tool steel, chemical composition, properties and T7A equivalent

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

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