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Unread 06-29-2017, 07:59 PM   #1
Thor
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Default Krieghoff Fireblue Magazine Release Button

Does anyone know why Krieghoff fire blued their mag release buttons? Always been curious about this. Bottom one is one I restored. An S Date.

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Unread 06-29-2017, 08:40 PM   #2
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Hi Thor,
As you know the Luger magazine release is not a highly stressed part (I've never heard of one breaking or wearing out) and I don't think Kreighoff cared what color they turned out after heat treating. I've seen them almost every color of the spectrum, here's mine.
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Unread 06-29-2017, 09:13 PM   #3
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Thank you Norme, interesting. Very Nice Pistol!
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Unread 06-29-2017, 10:04 PM   #4
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Perhaps the fire blue hardened the metal a bit as it is a part that could wear with the magazine constantly going in and out?
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Unread 06-30-2017, 07:47 AM   #5
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Couple examples in the normal range .

Norme's example is less common .

There are other fire-blue parts inside . Holdopen [ polished on top only ] , S bar , recoil lever , toggle axle etc.

No idea why and my S date 2014 has the thumb safety lever mostly fire blue except the edges that are strawed . Heat was off I would guess ?
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Unread 06-30-2017, 10:55 AM   #6
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Quote:
Originally Posted by CJS57 View Post
Perhaps the fire blue hardened the metal a bit as it is a part that could wear with the magazine constantly going in and out?
No,
re-heating the hardened and polished part results in the color change- from straw to fire blue. This treatment is intended(usually) to remove some of the hardness=brittleness of the part. It also helps to eliminate internal stresses.

If one continues to heat the color continues to change until it gets to grey and then becomes hot enough to glow orange. A chart of the color changes has been posted here several times.

The incidental color- which can be very pleasing- is not the main reason for "fire blue", except perhaps in custom finishng.

To the other question or comment- for sure - the temperature of the oven or bath used for the heat treatment will result in edges or thin or other spots being blue, while others are still straw.

Kind of like you see in these tools; where you can see the transition from straw to darker straw, blue, purplish blue, and purple brown.
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Unread 06-30-2017, 10:24 PM   #7
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Don, Yes thank you, perhaps the fire blue was to normalize the hardened part as well as for the attractive color.
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