Rare German Polte Copperwasched Steelcase Cartridges 1936

Got Some Rare Polte Copperwasched Steelcase Cartridges 1936.

Headstamp P S 9 36

S= Stahlhülse/Steelcase

That are before they Introduced the Materialcode because the steel was not Perfect.

Looks like Polte took up the 1917-18 Eisen-hulse idea, copper-coated
Mildsteel . The beginning of redevelopement of steelcases.
E = Eiserne= Iron, a very low Carbon steel, probably 1010 or so.
Later St cases had a higher percentage carbon, but still in the mild steel range. The coating of copper or later Brass, was electrolytically coated, untill they improved on the Bonderisation process( phosphate surface etching, patented by France in 1920s, but then forgotten).
The Germans replaced Galvaniziert cases with Bonderised by 1943.

Those Polte cases are the first trials with Brass replacement in the III Reich.
Doc AV.

Those Polte cases are the first trials with Brass replacement in the III Reich.
Doc AV.

thats not thru…
I have a 1 35 Polte as Blank (P S 1 35)

and several others before lot 9 36 exists…, from which dutch must have the pics…

pp

So what is the difference between copper washed, brass washed and tin plated coatings?

Here is one very early copper-coated cartridge from Kopp, Treuenbrietzen. P198 S* 18 36. Still with the S* markings for brass.
My documents say that this lot and lot 16 from P198 was loaded as Platzpatr. but this is an Ss-patrone, and has the colour to show it. Maybe leftover cases in production?

Bunker

The cases are not copper washed, but copper clad. That happens in a rolling mill: a steel block with thin copper plates on top and bottom is rolled until it reaches the thickness needed for making cups from it. The surprising thing is that copper (5 to 10 % of steel thickness) and steel keep their relative thickness through the rolling process and become perfectly bounded.
In German cases, only the cut parts (case mouth, extractor groove, primer pocket) afterwards received a thin galvanic copper layer for rust protetion.
Gilding, brass and cupro-nickel cladding is done the same way. Gilding is just another name for brass with about 90 percent copper while cupro-nickel has about 85 to 90 percent copper and the remainder nickel.

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Since my Statement " Polte’s trials cases" re. 36 dates has been questioned, just When did Polte start trialling and manufacturing these “Bi-metal” cases (Russian term for rolled-on copper coating)?
It certainly is sometime in 1935, as shown by samples noted, especially the S* marked ones, that being the 72/28 alloy headstamp for Brass cases;
Anybody got a 1935 survey of Lot numbers for Polte?
Doc AV

Gentleman, this is not correct.

The first known trials after WW1 were done in 1928 by Polte.

P%201%2028%20St%20cu
1%20sS%20Stahl

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Willem, great image!

Is that P 28 copper washed or copper clad?