Hi Strat!
Carpenter 20CB-3 (UNS# N08020) - An austenitic stainless steel with excellent resistance to hot sulphuric acid, and many aggressive environments which readily attack Type 316 stainless. Excellent resistance to Stress Corrosion Cracking (SCC). Weldable, machinable, and cold formable.
Chemical composition:
0.06 C, 2.00 Mn, 0.035 P, 0.035 S, 1.00 Si, 19.00/21.00 Cr, 32.50/35.00 Ni, 2.00/3.00 Mo, 3.00/4.00 Cu, 8xC min./1.00, max. Cb + Ta, Bal. Fe (Single figures are maximums).
http://www.cartech.com/product_literature/pdf/GuideToSelecting.pdf?leftn=cartech&lefto=empty&lefti=cartech_pl0 The information above can be found in the .pdf file above on page 16 of 83.
One can get this, and more technical information if one clicks one of the links below ;) :
http://www.cartech.com/product_literature/pdf/SelectaloyBklt2001.pdf?leftn=cartech&lefto=empty&lefti=cartech_pl0http://www.cartech.com/servlet/ProdLitOrderFormServlet?leftn=cartech&lefto=empty&lefti=cartech_pl0http://www.cartech.com/Respectfully,
Henry