本文件已被宣布为“稳定”，不再接受货币定期审查。用户负责验证参考资料和持续适用性或技术要求。新技术可能存在。本信息报告旨在为翻车保护结构（ROPS）和坠落物保护结构（FOPS）材料的合理选择和应用提供概念，并提供在选择和使用保护结构材料时应考虑的特性信息。虽然其他材料也可以成功使用，但本报告仅限于考虑钢的机械性能和加工特性。重点放在韧性方面（抵抗脆性断裂的能力），因为该特性对结构完整性至关重要。 需要强调的是，材料特性的特定值仅与特定设计考虑因素（如结构尺寸或焊缝细节和位置）相关。由于有许多设计材料系统可成功用于实现规定的保护结构性能，因此本报告未对钢材进行分类选择。

This document has been declared "Stabilized" and will no longer be subjected to periodic reviews for currency. Users are responsible for verifying references and continued suitability or technical requirements. New technology may exist.The purpose of this information report is to provide concepts for rational selection and application of materials for Rollover protective structures (ROPS) and Falling Object Protective Structures (FOPS) and to provide information about the properties that should be considered in selecting and utilizing material in protective structures. While other materials could conceivably be used successfully, this report is limited to a consideration of steel with discussion on its mechanical properties and processing characteristics. Emphasis is placed on the toughness aspect (ability to resist brittle fracture) as this property is of paramount importance to structure integrity. It is emphasized that specific values for material properties have relevance to performance only in conjunction with specific design consideration such as structure size or weld joint detail and location. Because there are many design-material systems which can be successfully employed to achieve the prescribed performance of protective structures, this report does not make categorical selection of steels.