Which high-alloyed hot work tool steel is known for excellent resistance to abrasion and shocks at elevated temperatures?

• A. AISI A2
• B. AISI H12
• C. AISI H13
• D. AISI H19

Answer: (D)

The correct choice emphasizes the characteristics associated with high-alloyed hot work tool steels that are designed for specific applications involving elevated temperatures, abrasion resistance, and shock resistance.

The steel known for excellent resistance to abrasion and shocks at elevated temperatures is often associated with the H-series of tool steels, particularly AISI H13. This steel has been formulated to retain hardness and strength under high-temperature conditions, making it suitable for hot work applications such as die casting and forging. AISI H13 is especially recognized for its ability to resist wear, deformity, and thermal fatigue, which are crucial attributes in demanding environments.

In contrast, other steels like AISI A2 are primarily cold work tool steels and are designed for applications where wear resistance at lower temperatures is more critical. AISI H12 and AISI H19 also fall into the realm of hot work steels but do not quite match the overall performance and reputation of H13 in terms of thermal properties and shock resistance.

Thus, while you may have chosen an option that could seem plausible, AISI H13 is the one that truly encapsulates the description in the question regarding excellent resistance to abrasion and shocks at elevated temperatures.