Comparison of Norris 96 and 97 HS Sucker Rods

[danielwpalmer]

Can someone elaborate on the difference between Norris 96 and 97 high strength rods? Beyond minor differences in material specs (as below), I have heard 97 has better performance in a corrosive environment. Is that the only major difference? To clarify, there is a significant difference in cost, on the order of about 18%.

[It looks like the formatting will be terrible for the data below, source is

http://www.doverals.com/norrisrods/en/norrisglobal/products/sucker-rods#

]

Norris Rod Type 96 97
AISI Grade A-4138_M A-4330-M1
API Grade SPECIAL SPECIAL
Chemical Properties, %
Carbon .38/.43 .28/.35
Manganese .90/1.50 .70/.90
Phosphorus .035 Max .035 MX
Sulphur .40 Max .040 MX
Silicon .20/.35 .15/.35
Copper .35 Max .35 MX
Nickel .30 Max 1.65/2.00
Chromium .55/.85 .70/.90
Molybdenum .25/.35 .20/.30
Vanadium .045/.065 .03/.07
Physical Properties
Normalized 1,550 degrees +/- 25 degrees F, Tempered 1,200 degrees +/-25 degrees F (approx)
Tensile, KSi 135/150 140/150
Yield, KSi, 2% Offset 115 min 115/125
Elong., 8" 10 min 10 min
Reduction, % 45 min 45 min