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Comparison of Norris 96 and 97 HS Sucker Rods

Comparison of Norris 96 and 97 HS Sucker Rods

(OP)
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...#]

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

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