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Please advise Heat Treatment of this screw in a mesh belt furnace. Bulk. Material is SAE 1022 C - 0.18 - 0.23 Mn - 0.7 - 1.0 P - 0.04 max S - 0.05 max

and a longer screw is used for Crest Fixing ...https://files.engineering.com/getfile.aspx?folder=e92a6ad9-1758-4830-a233-840495ba60ac&file=Crest_Fixing.JPG

A smaller length screw is used for Valley Fixing ...https://files.engineering.com/getfile.aspx?folder=161fe48a-caba-4d21-a7f6-f087fbf8031b&file=Valley_Fixing.JPG

Screw in action ................................. The angle thickness here is 5 mm.https://files.engineering.com/getfile.aspx?folder=d170f519-a1b9-4983-a84d-3395dcaab026&file=Drilling_Demo.mov

The screw used to fix these is a SElf Drilling Screw :https://files.engineering.com/getfile.aspx?folder=dd9b6cf6-2f26-4454-ae4a-4dad9d7859bd&file=Hex_Flange_Head_SDS_copy.jpg

... and then fix the cladding on the sides and roof.https://files.engineering.com/getfile.aspx?folder=e992a614-e3fb-4f70-b5e6-df4f9b517c61&file=Pre-Engineered-Building.jpg

Gentlemen, I will post a few pictures to explain the product. The way to construct PEB (Pre Engineered Building) is to first erect a framework : https://files.engineering.com/getfile.aspx?folder=ad40cb03-a931-4112-8f46-33b48ca1ac71&file=Framework.jpg

To answer “blacksmith”, we are testing on HV1 scale. The HRc is only conversion.

This is the screw. The drill size is pre matched in the front tip. I think the picture will answer most questions.

The screw I am making is a Self Drilling Screw. 1022 is the standard material. The screw has to be hard enough to cause the drilling (in 6mm steel plate), then the threads have to tap the steel plate until the flange touches. It should NOT break during the process. I am doing Carbonitriding...

I am making special fasteners from 1022 steel. The screw needs a high surface hardness (58-60 HRc) but should be able to bend also (5-7 degrees). In my heat treatment process I get the hardness but the screw does not pass the bend test. It is brittle and breaks. HELP !