This part of GB/T 3098 specifies the mechanical properties of bolts, screws and studs made of austenitic, martensitic and ferritic corrosion-resistant stainless steels when tested at an ambient temperature of 10 ℃ ~ 35 ℃ . It may perform differently at higher or lower temperatures. Bolts, screws and studs to which this section applies: --the nominal diameter of the thread d≤39 mm; --the diameter and pitch comply with GB/T 192, GB/T 193 and GB/T 9144 ordinary threads; --any shape. Not suitable for fasteners with special performance requirements, such as weldability. This section does not specify corrosion resistance and oxidation resistance in special environments. However, some information on materials for special environments is given in Appendix E. For the definition of corrosion and corrosion resistance, see GB/T 10123. This part classifies corrosion-resistant stainless steel fasteners 1) according to their performance. Some materials can be used in air to a temperature of -200 ℃, while some materials can be used in air to a temperature of + 800 ℃. For information on the effect of temperature on mechanical properties, see Appendix F. Corrosion resistance, oxidation resistance and mechanical properties for use at high temperatures or below zero can be agreed between the user and the manufacturer for each particular occasion. Appendix G gives information about the risk of intergranular corrosion caused by carbon content under high temperature conditions, depending on the carbon content. All austenitic stainless steel fasteners are usually non-magnetic in the solid solution state; after cold deformation, some will exhibit obvious magnetic properties (see Appendix H).
GB/T 3098.6-2014 Referenced Document
GB/T 192 General purpose metric screw threads--Basic profile
GB/T 193 General purpose metric screw threads--General plan
GB/T 228.1 Metallic materials—Tensile testing—Part 1: Method of test at room temperature*, 2021-12-31 Update
GB/T 3098.1 Mechanical properties of fasteners.Blots, screws and studs
GB/T 4334 Corrosion of metals and alloys-Test methods for intergranular corrosion of austenitic and ferritic-austenitic (duplex) stainless steels*, 2020-04-28 Update