GB/T 3098.21-2014
Mechanical properties of fasteners.Stainless steel tapping screws (English Version)

Standard No.: GB/T 3098.21-2014
Language: Chinese, Available in English version
Release Date: 2014
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 3098.21-2014
Replace: GB/T 3098.21-2008

Scope: This part of GB/T 3098 specifies the mechanical properties of self-tapping screws made of austenitic, martensitic and ferritic corrosion-resistant stainless steels when tested at an ambient temperature of 10 °C to 35 °C. It may perform differently at higher or lower temperatures. This Part applies to self-tapping screws with thread ST 2.2~ST 8 specified in GB/T 5280. This section does not apply to self-tapping screws with special requirements, such as weldability. This section does not specify corrosion resistance and oxidation resistance in special environments, and some information on materials used in special environments is given in Appendix C. For the definition of corrosion and corrosion resistance, see GB/T 10123. This part classifies the corrosion-resistant stainless steel self-tapping screws according to the hardness level. Corrosion resistance, oxidation resistance and mechanical properties for use at high temperatures or below zero can be agreed between the user and the manufacturer on a case-by-case basis. Appendix D shows how the risk of intergranular corrosion depends on the carbon content under high temperature conditions. 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 E).

GB/T 3098.21-2014 Referenced Document

GB/T 3098.6 Mechanical properties of fasteners—Stainless steel bolts，screws and studs*， 2023-05-23 Update
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
GB/T 4340.1 Metallic materials.Vickers hardness test.Part 1:Test method
GB/T 5267.4 Passivation of corrosion-resistant stainless-steel fasteners
GB/T 5280 Tapping screws thread
GB/T 90.3 Fasteners.Quality assurance system

2014 GB/T 3098.21-2014 Mechanical properties of fasteners.Stainless steel tapping screws
2008 GB/T 3098.21-2008 Mechanical properties of fasteners.Tapping screws of stainless-steel