? I have a customer needing some 4130 tubing turned and heat treated to 150 KSI which i found to be 33.3 on rockwell C scale. The tubing needs to be .991 OD, 5/8 ID and it's 9.75 long. Can this be done with my oven or should I flame harden these? Not really familiar with this hardness.
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Heat Treat 4130 Tubing
- Thread starter Jmoncrief
- Start date
- Replies 11
- Views 4,992
johnoder
Diamond
- Joined
- Jul 16, 2004
- Location
- Houston, TX USA
EMJ catalog says
Not much mass there - 1.28 Lbs. You won't have any fiddle around time getting it in to the quenching medium
Not much mass there - 1.28 Lbs. You won't have any fiddle around time getting it in to the quenching medium
Last edited:
moonlight machine
Diamond
- Joined
- Nov 19, 2007
- Location
- marysville ohio
How straight do they need to be? You may need to hang them while in the oven. You may have to heat treat first then turn or grind them.
adh2000
Titanium
- Joined
- Dec 21, 2005
- Location
- Waukesha, WI
4130 tubing is a pain to turn with good uniform surface finish. If I had to hit 0.991 OD I would definitely heat treat first then have it centerless ground to 0.991 then cut 0.1 over length and finish the ends on the lathe.
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Sent from my iPhone using Tapatalk
General rule is 1 hour per inch of thickness/radius of the part.
johnoder
Diamond
- Joined
- Jul 16, 2004
- Location
- Houston, TX USA
Or 11 minutes for your .183" wall thickness
This soak would follow the piece getting hot enough VISIBLY to be same color as interior of furnace
FredC
Diamond
- Joined
- Oct 29, 2010
- Location
- Dewees Texas
If you are doing a bunch of these I would send them out, trying to get them all the same in a small furnace would be difficult.
HuFlungDung
Diamond
- Joined
- Jan 19, 2005
- Location
- Canada
Decarburization might be an issue, too. 4130 is barely hardenable without a severe water quench. A little bit of carburization might make it possible to do an oil quench. Just my WAG.
CarbideBob
Diamond
- Joined
- Jan 14, 2007
- Location
- Flushing/Flint, Michigan
The spec is 33 RC, can this be done in 4130 with a simple heat and dip?
No draw back needed?
Bob
No draw back needed?
Bob
johnoder
Diamond
- Joined
- Jul 16, 2004
- Location
- Houston, TX USA
EMJ catalog has Mass Effect Data in back - First (smallest section) tempering temp is 900F - giving 331 Brinnell - over 33 Rc
I have to assume as quenched / no draw is over that
Example for 4142 is Thumbnail
Attachments
Matt_Maguire
Stainless
- Joined
- Oct 17, 2011
- Location
- West-Central Illinois, USA
Data suggests this section should water/brine quench to 50ish Rc from 1575°F and a 975-1000°F temper should have you in the 32Rc range.
I’d leave at least .125” ID and OD for finish machining (and maybe some bending first).
He may try a first piece to completely machined if he's home baking as the temper might have to go down to 950°F. Tempering below 950°F with this stuff would be unwise if it’s structural.
Good luck,
Matt
On edit, I should have added 150Ksi is asking some extra for this stuff, 130ish is the middle of the strike zone IMO.
I’d leave at least .125” ID and OD for finish machining (and maybe some bending first).
He may try a first piece to completely machined if he's home baking as the temper might have to go down to 950°F. Tempering below 950°F with this stuff would be unwise if it’s structural.
Good luck,
Matt
On edit, I should have added 150Ksi is asking some extra for this stuff, 130ish is the middle of the strike zone IMO.
