Definition

Noun: * A type of tool steel: Hot-work steel is a specific category of alloy steel engineered to retain its hardness, strength, and resistance to wear at very high temperatures, typically those encountered when the steel is glowing red-hot.

Usage

Hot-work steel is used almost exclusively in industrial manufacturing contexts. Its primary function is to serve as the material for tools and dies that operate while in contact with extremely hot materials. * It is used for making tools like forging dies, extrusion dies, and die-casting molds. * It is chosen because it resists thermal fatigue, softening, and erosion when processing materials like molten metals, hot glass, or plastics.

Examples

• The new die-casting mold was machined from a block of hot-work steel to withstand the molten aluminum.
• Forging hammers require dies made of hot-work steel to maintain their shape through thousands of strikes on red-hot metal.
• A key property of hot-work steel is its ability to resist heat checking, a form of surface cracking.

Advanced Usage

• In metallurgy: The classification "hot-work steel" is contrasted with "cold-work steel," which is optimized for cutting and forming materials at or near room temperature. Hot-work steels typically contain significant amounts of chromium, tungsten, molybdenum, and vanadium.
• As a material specification: In engineering drawings and procurement, it is common to specify a standard grade, such as H13 (a common hot-work steel grade), rather than the general term.

Variants and Related Words

• Hot-work tool steel: A more precise, full term that is often used interchangeably with "hot-work steel."
• H-series steels: The American Iron and Steel Institute (AISI) designation for hot-work tool steels (e.g., H11, H13, H21).

Synonyms

• High-temperature tool steel: A descriptive synonym emphasizing the key property.
• Red-hard steel: An older, less common term highlighting the characteristic of remaining hard at a red heat.

Antonyms

• Cold-work steel: Tool steel formulated for use at low temperatures.
• High-speed steel (HSS): While also used for cutting, HSS is a distinct category often used for cutting tools that generate, rather than are exposed to, high heat.

Noun

1. an alloy steel that remains hard at a red heat; used to make metal-cutting tools