PDA

View Full Version : Heat treatment services



shing
02-05-05, 10:59 AM
If you would like me to heat treat your blades, please read carefully below first.

Steels I can heat treat are O1, D2, 440C and EN42 I have supplied. All blades and springs must be clearly marked with the steel and the sender.

I can heat treat knife blades and folder springs. The cost is £4 for the first blade and £3 for additional blades in the same lot. Folder springs are the same cost. Postage costs are extra.

The minimum finish on the blade before heat treatment is 320 grit or finer all over the blade. It must have no sharp corners or deep scratches all of which can cause cracking. All holes must be chamferred.

Blades must be straight before being sent. I cannot straighten blades or regrind them except by prior agreement and an additional charge will be made.

The blade must be evenly ground on both sides to prevent warping. Blades should be wrapped in paper and cellotape or packaging tape, please no duct tape. All blades must be thoroughly degreased. It is not necessary to have any oil on the blades.

The blade will be hardened to Rc 58-62 and there will be some surface oxidation. Blades will be the same hardness throughout unless otherwise agreed beforehand. Blades can be made harder or softer by prior agreement but additional charges may be levied.

I cannot be responsible for any damage to the blades I heat treat but if I think there is going to be a problem, I will let the client know before starting any work. A handling charge may be levied at my discretion if blades prove to be unsuitable for heat treatment. Turnaround time for the blades will be 3 weeks or less. The maximum overall blade and spring length is 250mm unless agreement for longer blades has been made beforehand.

I reserve the right to reject any blades at my discretion. Payment for the service must be made one month or less after the blades have been heat treated or additional storage costs will be incurred. Blades that have not been paid for after 3 months will be disposed off and all proceeds will be retained to pay for storage and heat treating costs.

Please email me for further details.

Good luck!

JohanB
02-05-05, 01:52 PM
Why minimum 320 grit ?

shing
02-05-05, 03:29 PM
A fine finish reduces the risk of deep scratches causing stress risers

JohanB
02-05-05, 03:37 PM
oh right thanks

JohanB
02-05-05, 04:45 PM
What do you mean by chamferring holes ?
Sorry bout all this questions.

shing
02-05-05, 07:34 PM
chamferring is to countersink the holes slightly to break the 90 degree angle, this reduces stress risers. The best thing to do is make sure the blade is smoothly finished with no sharp corners or deep scratches. Areas or the blade like the plunge line, the blade/tang junction (if its a narrow tang) and a stamped mark are all potent stress risers that could be the origin of cracks like scoring a line to cut glass. Things that can cause warping could be incorrect or no stress relief when hardening, asymetric bevels, poor forging technique, design with sharp changes in cross section, the way the steel was rolled at the mill, not removing enought of the outer surfacr of hot or cold rolled steel plus many others.

Stew
02-05-05, 07:51 PM
Shing,

Can you HT the Damascus (http://www.brisa.fi/thunder.html) that Brisa sells?

shing
02-05-05, 11:55 PM
yes, done a few damascus blades

JohanB
25-05-05, 05:20 PM
Shing, have you recieved my two D2 blades yet ? Sorry i forgot to mark them as D2 Steel. They are sent by Johan Braadland as it says on the package and thats me.