Case hardening dimensional changes

Richard Rogers

Titanium

Joined

Nov 27, 2001

Location

Bentley, Louisiana

• Aug 13, 2004

• #1

I'll be sending some parts to a heat treater to be case hardened .030 deep 50 Rockwell hardness. There are some holes in it 3/8" NC and I was wondering if I should expect any dimensional changes that would make them too tight for a set screw. Material 1018 cold rolled steel.

Thanks,

Richard

 

johnoder

Diamond

Joined

Jul 16, 2004

Location

Houston, TX USA

• Aug 13, 2004

• #2

They will shrink up Richard. Ask them to plug them for you to keep the process out. At P&WA we copper plated all areas not to be carburized. You could also just tap the holes .005 over if a non critical application.

John

 

B

Bob-O

Hot Rolled

Joined

May 27, 2004

Location

Long Island, NY

• Aug 13, 2004

• #3

We put a green no-carb paste of some sort in all our threaded holes so they can be chased later if necessary. I can get the details if you need them.
Regards,
Bob

 

Ox

Diamond

Joined

Aug 27, 2002

Location

Northwest Ohio

• Aug 13, 2004

• #4

Will likely shrink .001

Think Snow Eh!
Ox

 

Richard Rogers

Titanium

Joined

Nov 27, 2001

Location

Bentley, Louisiana

• Aug 13, 2004

• #5

Thanks very much for the help. Bob-0, where to get that "green paste?" If you could tell me the brand, I could see if my normal suppliers like MSC carry it.

Richard

 

B

Bob-O

Hot Rolled

Joined

May 27, 2004

Location

Long Island, NY

• Aug 13, 2004

• #6

Richard,
We buy the paste directly from the manufacturer. It's Avion Mfg. at 1-800-284-6693, and their part number is G-CSO-1.
Regards,
Bob

 

O

old dog

Aluminum

Joined

Nov 28, 2002

Location

Mtn.Home Ar.

• Aug 13, 2004

• #7

If I remember right, we used to pack all the tapped holes with foundry sand.

 

M

MEF

Aluminum

Joined

Nov 29, 2002

Location

San Diego

• Aug 13, 2004

• #8

How about when heat treating something like 17-7ph stainless.

My understanding was it won't change dimention much when hardened. Will it change a threaded hole much?

Mark

 

johnoder

Diamond

Joined

Jul 16, 2004

Location

Houston, TX USA

• Aug 13, 2004

• #9

MEF: These are low temperature precipitation process, rarely over 1100* F, and you are not "adding stuff" like in carburizing 1018. Probably some change in a tapped hole, but I would not know if it is measureable with "shop" tools.

John

 

C

CGMachine

Plastic

Joined

Feb 9, 2017

• Sep 16, 2017

• #10

Hey There,
I know this is a long shot because of it being an old post. I was wondering if carburizing adds .005" overall to the part which is .0025" a side?

 

C

CGMachine

Plastic

Joined

Feb 9, 2017

• Sep 16, 2017

• #11

How Much Does Carburizing add to overall dimensions

Hey There,
I know this is a long shot because of it being an old post. I was wondering if carburizing adds .005" overall to the part which is .0025" a side?

Thanks,
CG