Quard 400 is martensitic abrasion resistant steel with an average hardness of 400 HBW. It is used for mining and earth moving equipment. This datasheet provides information on composition, hardness, and tensile properties as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: SA-690. Producer or source: NLMK Clabecq.