Herdes bly ved lagring?

[Øyvind Johansen]

Er det noen som har erfaring med at støpte blykuler blir hardere ved lagring??

 

Har hatt en følelse av at kulene kan bli hardere etter en tids lagring, så nå kjøpte jeg brinell-tester for å sjekke litt..

 

Kuler jeg støpte for 2 måneder siden holdt 11 brinell dagen etter støping.. målte samme kuler nå til 13,2 brinell...

[460XVR]

Helt normalt det

[Chickenthief]

http://www.lasc.us/Fryxell_Book_Contents.htm

 

Age hardening of the tertiary alloys is more pronounced in the softer alloys, suggesting that at the higher antimony concentrations precipitation occurs more readily during the cooling process. This age hardening can be accelerated by increasing the aging temperature. In general, measuring bullet hardness 24-48 hours after casting provides the most useful, and timely, information.

 

Age Hardening of Tertiary Lead/Antimony/Tin Alloys

Alloy As-cast 6h 48h 6 days 6 months

Lead 5 no change

97/2/1 9.2 17.1 20.2 21.6 18.0

94/3/3 12.4 14.1 16.9 18.2 16.6

(electrotype)

82/12/6 20.3 20.3 20.1 19.9 17.7

(stereotype)

 

In addition, arsenic (As) is commonly added to industrial lead-tin-antimony alloys to improve the strength (this strength enhancement is only observed when As is added to a Sb containing alloy, As is virtually worthless in the absence of Sb). Arsenic also significantly enhances the ability of the alloy to be hardened via heat treatment. All that is needed is 0.1% (more does no good). Wheelweight alloy commonly contains about 0.17% As.

 

Det skema blev ikke godt!

 

[Sniper-Arne]

Blylegeringer med antimonn hardner over tid. De hardner mye ila de første 3 ukene. Rene tinn/blylegeringer hardner lite over tid. De hardner heller ikke ved vanndropping

 

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