US 11,920,624 B2
Zn-Ni as a coating layer on self-drilling screws of austenitic stainless steel
Huang Kun-Hao, Thal (CH)
Assigned to SFS Group International AG, Heerbrugg (CH)
Filed by SFS intec Holding AG, Heerbrugg (CH)
Filed on Jul. 28, 2021, as Appl. No. 17/386,950.
Claims priority of application No. 20188321 (EP), filed on Jul. 29, 2020.
Prior Publication US 2022/0034352 A1, Feb. 3, 2022
Int. Cl. F16B 25/10 (2006.01); C22C 18/00 (2006.01); C23C 30/00 (2006.01); F16B 25/00 (2006.01)
CPC F16B 25/103 (2013.01) [C22C 18/00 (2013.01); C23C 30/005 (2013.01); F16B 25/00 (2013.01); F16B 25/10 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A self-drilling screw (10) comprising:
a head (20),
a shaft (30) at least partially wearing a thread (35), and
a drill point (40),
wherein a base material of the screw (10) including the drill point (40) is integrally manufactured from an austenitic 300 series steel with an uncoated surface hardness of 400-600 HV 0.3, and
a coating of Zn—Ni with a Ni-content between 12-15% deposited on the austenitic 300 series steel base material.