Core Viewpoint - The automotive industry is experiencing a competitive race in steel strength, with companies promoting increasingly high values for steel used in vehicles, raising questions about the actual safety implications of these numbers [1][3]. Group 1: Steel Strength Competition - Chery Automobile and Hebei Steel Group have introduced ultra-high-strength 2400MPa hot-formed steel, while a new player has reportedly launched 2420MPa steel, which is claimed to be twice as strong as tank armor [1][3]. - The debate centers on whether the reported steel strength refers to yield strength or tensile strength, and whether higher numbers genuinely enhance vehicle safety [1][3]. Group 2: Consumer Perception and Marketing - Many automotive companies emphasize higher steel strength values in marketing to suggest enhanced safety, exploiting consumer knowledge gaps [5][6]. - Consumers often misunderstand the difference between yield strength and tensile strength, leading to confusion in vehicle safety assessments [5][6]. Group 3: Technical Definitions - Yield strength is the stress at which a material begins to deform plastically, while tensile strength is the maximum stress a material can withstand before failure [6][7]. - Generally, tensile strength values are higher than yield strength, but the industry has shifted towards using tensile strength for marketing purposes, which can mislead consumers [7][8]. Group 4: Industry Standards and Practices - There are very few models with yield strengths exceeding 2000MPa, while many models boast tensile strengths above this threshold [8][9]. - Companies often create marketing terms like "super high-strength steel" without standardized definitions, leading to potential consumer deception [8][9]. Group 5: Comprehensive Safety Considerations - Automotive safety is a complex system that involves more than just steel strength; factors like body structure, welding processes, and material durability are equally important [9][10]. - The use of high-strength steel can lead to issues like hydrogen embrittlement, which may cause delayed fractures, emphasizing the need for a holistic approach to vehicle safety [10][11]. Group 6: Cost and Production Implications - The cost of using high-strength steel is significantly higher, with production costs increasing by approximately 60% compared to regular steel [11]. - The proportion of high-strength steel used in vehicles directly affects production costs and safety ratings, necessitating careful consideration by manufacturers [10][11].