GB/T 3098.24-2020 Active

This part of GB/T 3098 specifies the mechanical performance requirements for bolts, screws, studs, and nuts made of corrosion-resistant stainless steel and nickel alloys, which are used at high temperatures up to 800°C, when tested at an ambient temperature of 10°C to 35°C.
Note: The fasteners specified in this part are also suitable for use at low temperatures, typically down to -50°C. For more information, please refer to GB/T3098.25.
This part specifies the performance of fasteners made of three types of materials: martensitic stainless steel, austenitic precipitation-hardened stainless steel, and nickel alloys. GB/T3098.25 provides general rules and additional technical information on suitable stainless steels and nickel alloys and their performance.
The fasteners applicable to this part include:
—— Ordinary threads that comply with GB/T 192;
—— Diameter and pitch combinations that comply with GB/T 193;
—— Tolerances that comply with GB/T 197 and GB/T 9145;
—— Coarse-threaded bolts M3~M39;
—— Fine-threaded bolts M8×1~M39×3;
—— Full-bearing capacity fasteners of any shape.
The provisions of this part also apply to fasteners whose dimensions exceed the applicable range but meet all the requirements for use.
This part does not address fasteners with reduced bearing capacity (such as thin nuts and bolts, screws, and studs with heads or shanks that are weaker than the threaded portions).
This part does not specify the following performance requirements:
—— Torque clamping force performance;
—— Shear strength;
—— Fatigue resistance;
—— Weldability;
—— Locking performance.