High-alloy white cast irons are engineered for abrasion resistance and corrosion protection, with applications in machinery that processes abrasive materials. The alloys are divided into nickel-chromium white irons, chromium-molybdenum irons, and high-chromium white irons. The composition and heat treatment of these alloys allow for specific balances of hardness, toughness, and resistance to wear.
High-strength iron
High-strength carbon and low-alloy steels represent a critical category of structural materials with yield strengths exceeding 275 MPa. These steels are classified into four distinct categories: as-rolled carbon-manganese steels, as-rolled high-strength low-alloy (HSLA) steels, heat-treated carbon steels, and heat-treated low-alloy steels. Each classification offers superior yield strength compared to conventional mild carbon steel in as-hot-rolled conditions.
Hot work tool steels are specialized alloys designed to withstand extreme conditions during the hot-forming of metallic workpieces. These steels facilitate manufacturing processes such as pressure die casting, extrusion, and drop forging at elevated temperatures. Distinguished by their ability to maintain hardness and structural integrity despite thermal cycling, hot work tool steels require specific properties including high tempering resistance, thermal shock resistance, and wear resistance.
This comprehensive study examines the critical role of hydrogen control in steel manufacturing and its significant impact on product quality. Hydrogen contamination, even at concentrations of a few parts per million, can cause severe defects including flaking, embrittlement, and reduced ductility. The article explores thermodynamic principles governing hydrogen behavior in steel, analyzes various contamination sources during production, and presents experimental data on hydrogen pickup through calcium hydroxide and coke additions.