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Max Online: 16728 @ 03/25/12 08:51 AM
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#7154077 - 04/28/18 07:51 AM What temp and quench fluid question.
FiremanJG Online   content
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Registered: 12/16/08
Posts: 26107
Loc: Wolfe City, TX
I'm slowly finishing a knife made from a farrier's rasp. I annealed , peened, and milled part of it. Once I'm done grinding, and get my pin holes drilled, I've got a heat and quench question.

Here's what I have. A 2 burner propane forge, big quench tub that could hold water, or brine, and a tub full of used engine oil, and a little oven than will get only to 500°F.

Should I heat to a certain color and quench in which one of the fluid? Or would yall rather I bought something to tell me exaclty my steel temp? Would yall rather I purchased a certain quench oil?

I'm still an amateur knife maker, so I thought I'd ask you experts.I just make knives for myself, and gifts. No way could I compete with the masterfull work many of yall do. smile
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#7154442 - 04/28/18 07:46 PM Re: What temp and quench fluid question. [Re: FiremanJG]
MikeC Offline
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Registered: 08/09/05
Posts: 13821
Loc: Grayson County
I take the rasp knives to 1500° and quench in Chevron 70 quench oil heated to 125° or so. That normally results in a HRC of 62 to 63. Then temper at 400° for an hour two times allowing the blade to cool in still air to ambient temp between tempers. Others do it differently I'm sure but that is what works for me.
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#7154454 - 04/28/18 08:01 PM Re: What temp and quench fluid question. [Re: MikeC]
FiremanJG Online   content
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Registered: 12/16/08
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Loc: Wolfe City, TX
Much appreciated Mike! up

Would an infrared heat indicator work?
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#7154859 - 04/29/18 01:52 PM Re: What temp and quench fluid question. [Re: FiremanJG]
MikeC Offline
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Registered: 08/09/05
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Loc: Grayson County
I've never tried one so I really don't know how accurate it would read the blade while in the forge. You can heat the blade slowly in the forge and check it frequently with a magnet. Once the blade reaches critical temp it will no longer be magnetic. Once it reaches that point heat it just a little more then quench it. A lot of makers quench the rasp or file blades in canola or peanut oil with satisfactory results.
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#7154933 - 04/29/18 03:12 PM Re: What temp and quench fluid question. [Re: FiremanJG]
shumpertdavid Offline
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Registered: 04/25/11
Posts: 426
Loc: Lake Texoma near Whitesboro
I don't think the IR temp guns will be accurate or may not go that high.

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#7154955 - 04/29/18 03:51 PM Re: What temp and quench fluid question. [Re: FiremanJG]
FiremanJG Online   content
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Registered: 12/16/08
Posts: 26107
Loc: Wolfe City, TX
Thank you both!

I've got magnets, I can give that a try.

What do yall use to measure steel temp?
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#7155044 - 04/29/18 06:08 PM Re: What temp and quench fluid question. [Re: FiremanJG]
MikeC Offline
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Registered: 08/09/05
Posts: 13821
Loc: Grayson County

With the optional RampMaster III controller.
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#7163205 - 05/07/18 05:58 PM Re: What temp and quench fluid question. [Re: FiremanJG]
Precision_Shooter Offline


Registered: 02/18/09
Posts: 987
Loc: Crossroads, TX
Propane burner and firebrick forge for me. Use magnets to check temp and canola oil to quench. Oven to temper
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#7163394 - 05/07/18 08:48 PM Re: What temp and quench fluid question. [Re: FiremanJG]
FiremanJG Online   content
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Registered: 12/16/08
Posts: 26107
Loc: Wolfe City, TX
^^Much appreciated, sir.
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