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AISI 4130 combines 0.28–0.33% carbon with 0.80–1.10% chromium and 0.15–0.25% molybdenum, producing a chromium-molybdenum low-alloy steel that responds strongly to normalizing, quenching and tempering. Its nominal density is about 7.85 g/cm³, while published normalized data for a 25 mm round specimen show approximately 670 MPa tensile strength, 435 MPa yield strength, 25.5% elongation and 197

Grade C, Grade D and Grade K sucker rods are steel load-transmitting members used in reciprocating rod-lift systems to connect the surface pumping unit with the downhole pump. Each rod consists of a straight steel body, forged or upset ends, wrench flats and threaded pins, while couplings connect individual rods into a continuous rod string. During

API sucker rods transfer reciprocating load from the surface pumping unit to the downhole pump through a connected rod string. Each pumping cycle changes the tensile load in the rod body, forged upset and threaded connection, so grade selection must account for yield strength, tensile strength, fatigue stress, corrosion exposure and the remaining cross-sectional area