Another very knowledgeable Damascus and Fluid Steel shotgun barrel guy was PeteM, who constantly proved to us that "Copy and Paste" research is not really a bad thing... so long as you actually understand the subject:

Originally Posted by PeteM
I should have looked earlier....

Metallurgy: The Art of Extracting Metals from Their Ores, and Adapting Them to Various Purposes of Manufacture
By John Percy
Published by J. Murray, 1864

http://books.google.com/books?dq=krupp+carbon&pg=PA837&id=RYpBAAAAIAAJ#PPA837,M1
Quote
Uniformity in grain, to which I have above alluded, is not an invariable characteristic of Krupp's steel ; for not long ago I received from Mr. Lloyd, chief engineer of the Navy, part of a fractured marine shaft made of this steel, which was very much more largely crystalline towards the centre than elsewhere.

The following is an analysis by Mr. Abel, of the lioyal Arsenal, of a portion of a cast-steel gun made by Krupp :

Carbon, combined 1.18%
Silicon 0.33%
Sulphur none.
Phosphorus 0.02%
Manganese trace.
Cobalt and nickel 0.12%
Copper 0.30%
Iron, by difference 98.05%

Another analysis of Krupp steel used for railroad rails.
Engineering chemistry: a practical treatise for the use of analytical chemists, engineers, ironmasters, iron founders, students, and others
By H. Joshua Phillips
Published by C. Lockwood & son, 1891

http://books.google.com/books?id=UgBIAAAAIAAJ&pg=PA65&dq=krupp+carbon+silicon+Manganese#PPA65,M1

Side by side analysis of Krupp with other steels.
A naval encyclopædia: comprising a dictionary of nautical words and phrases; biographical notices, and records of naval officers; special articles of naval art and science
Published by L. R. Hamersly & co., 1880

http://books.google.com/books?id=IPvxNqDjeXYC&pg=PA387&dq=krupp+carbon+silicon+Manganese

Another side by side comparison
Proceedings - Institution of Mechanical Engineers
By Institution of Mechanical Engineers (Great Britain)., Institution of Mechanical Engineers (Great Britain)
Published by Published for the Institution by Mechanical Engineering Publications Ltd., 1902
Item notes: pt. 2

http://books.google.com/books?id=HXbNAAAAMAAJ&pg=PA838&dq=krupp+carbon+silicon+Manganese#PPA837,M1

Alfred Krupp: a Sketch of His Life and Work: After the German of Victor Niemeyer
By Kate Woodbridge Michaelis, Otho E. Michaelis, E. Monthaye
Published by T. Prosser, 1888

Krupp puddled steel plant
http://books.google.com/books?id=UKlCAAAAIAAJ&pg=PA60&dq=krupp+puddling#PPA59,M1

The composition seems to change over time and possibly by intended use.

Pete

A true sign of mental illness is any gun owner who would vote for an Anti-Gunner like Joe Biden.