Stainless steel self-drilling screws are classified into 304 stainless steel self-drilling screws, 410 stainless steel self-drilling screws, and 316 stainless steel self-drilling screws.

One, 304 self-drilling screws

304 stainless steel belongs to austenitic stainless steel. This stainless steel is non-magnetic under normal conditions and slightly magnetic after cold working; it can maintain its austenitic structure at various temperatures without phase transformation. Therefore, the hardening process cannot be performed by heat treatment. Cold work can be used to increase the strength while being hardened. The feature of 304 stainless steel self-drilling screw is that it does not require pre-drilling; it can directly penetrate aluminum-plastic panels, plastics, plastic steel doors and windows, glass curtain walls, etc.; tapping; locking is completed in one time. The advantages of 304 stainless steel self-drilling screws are very obvious: time-saving, labor-saving, labor-saving, and good corrosion resistance; the disadvantage is that its mechanical properties are not high; therefore, it should be avoided in the selection of objects and scenes. Hit the iron plate. The iron plate needs to use 410 material self-drilling screws or composite stainless steel self-drilling screws.

304 material composition table: C:0.08 Si:1.00 Mn:2.00 P:0.045 S:0.030 Ni:8.00-10.5 Cr:18.00-19.00

Two, 410 self-drilling screws

410 material (namely 1Cr13) is a kind of martensitic stainless steel; contrary to austenite, it is magnetic; therefore, it is wrong to use iron magnets to determine whether the drill screws you buy are made of stainless steel. The main feature of 410 stainless steel self-drilling screws is that the core hardness and surface hardness of self-drilling screws can be improved by heat treatment; the comprehensive mechanical properties are also very high; but compared with 304 and 302 in terms of corrosion resistance, they are lacking. The self-drilling screw of 410 material does not require pre-drilling as the 304 material, and can directly penetrate the iron plate, but its corrosion resistance is not high, so avoid using it under strong acid, humidity and other perishable environments: 1 Direct contact with rain; 2 is not suitable for strong acids and alkalis; 3 is not suitable for environments with high climate and humidity; 4 is not suitable for seaside; 5 is not suitable for nearby chemical factories. If you want to use it, it must be treated with rust prevention, such as metal surface treatment such as dacromet or rust resistant treasure, otherwise it cannot be used directly.

410 material composition table: C: 0.11 Si: 0.46 Mn: 0.45 P: 0.028 S: 0.002 Cr: 11.95

Five, compound self-drilling screw

Product structure: 304 or 316+410 composite stainless steel self-drilling screws

Product features: composite stainless steel self-drilling screws because the threaded and tapped areas are all specially hardened metal; when tapped into the iron plate; the stainless steel part is introduced into the thread; the previous stainless steel tapping screws are completely eliminated; A phenomenon in which threads are worn out and locked; to achieve complete conclusion; and to maintain the highest coefficient of pull-out strength. No pre-drilling is required; it can replace the existing stainless steel tapping screws, and is most suitable for the installation of various wall materials; construction; thereby improving the anti-rust ability. Composite stainless steel tail drill screw; because of its unique drill die design; used in steel structure engineering; can achieve the lightest load; the fastest cutting effect; not only can reduce the user's workload; work at high altitudes; or Based on the difficult working environment; better able to exert its outstanding effect.

Application range: Due to its excellent anti-rust ability, the corrosion resistance life can reach full effect, which is very suitable for all kinds of environments with high corrosion resistance requirements.