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Corrosion Resistant Cables

Stainless Steel Cables

Camesa can armor cables using 3 different types of stainless steels - SUPA-75 AND SUPA-80 manufactured by Bridon and 20MO-6 manufactured by Carpenter Technology. These steels have increased resistance to H₂S and CO₂ when compared to the conventional armor material GIPS high carbon steel armor. Camesa has available on request literature from the stainless steel wire manufacturer discussing the relative merits of these different materials. These steels are each high in nickel content which offers increased resistance to chloride stress corrosion and cracking. Shown below are the main constituents of each stainless steel:

	%Ni	%Cr	%C(max)	%Mo	%Mn(max)
25-6 Mo	24 - 26	19 - 21	.02	6 - 7	2.0
SUPA-75	25	20	.02	6.5	1.7
SUPA-80	31	27	.01	6.5	1.0
20Mo-6	36	24	.03	5.7	1.0
MP-35N	33 - 37	19 - 21	.025	9 -10.5	.15

The tensile strength range of all three of these stainless steels in the diameter of wire used in pressure cables (.025"-.036" diameter) is less, 240,000 - 270,000 psi, than the tensile of the GIPS galvanized improved plow steel, 270,000 - 300,000 psi. Thus cables made with these stainless steels are rated, at a slightly lower breaking strength than the common plow steel cables. Additionally the tensile range drops as the temperature rises. At 500 degree F, 20MO-6 has about 83% of the tensile rating as it does at 200 degrees F. Thus at higher temperatures, the breaking strength of the cable is less than at room temperature.

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Camesa, Inc · 1615 Spur 529 · P.O. Box 1048 · Rosenberg, Texas 77471 Phone: (281) 342-4494 · Fax: (281) 342-0531