Function of Polish Rod

Polish rod is a kind of special sucker rod connected with sucker rod and beam hanger. It is at the top of sucker rod, need to bear the most strength,so with bigger diameter and higher steel grade than sucker rod, and the surface is very smooth.

We also provide: API AISI 4140 Polished Rod, 3/4" Polished Rod.

Main function:

Combined with packing set in packing box to seal wellhead and prevent oil、gas、water disclosure.

Interim connector between sucker rod and mule head hanger.

Finishing indicator diagram test.

Complete various wellhead operation, such as pump striking, regulating pump setting.

CHEMICAL COMPOSITION

Sucker rod manufacturer: Found Petroleum Equipment

Type specification table:

Nominal value Rod body diameter   D 

+0.127-0.254（+0.005-0.010）

mm（in) Length  Lmm士 50mm  （Lft 士 2in) Thread  nominal diameter   mm（in） mm    (in） Outer thread  shoulder outer diameter Suitable sucker rod size   mm (in)

29 28. 6 (11/8） 2438, 3353, 4877, 6707, 7315, 7925

(8, 11. 16. 22. 24 , 26) 24 （15/16） PR 一 16 (5/8)

27 （1 1/16） PR 一 19 (3/4)

29 28. 6 （11/8）rod-upset on one end 2438, 3353, 4877, 6707 , 7315, 7925                                                 (8. 11, 16. 22 , 24 , 26) 24 (15/16 ) SR 31.8+0.127-0.254        (1.250+0.005-0.010) 16 (5/8)

27 (1 1/16 ) SR 38.1+0.127-0.254        (1.500+0.005-0.010) 19 (3/4)

32 31.8（1 1/4） 3353, 4877， ,6707，7315, 7925 , 9144, 10973

(11, 16, 22 . 24.  26, 30. 36) 30 (1 3/16 ) PR 一 22(7/8)

32 31.8（1 1/4）rod-upset on one end 3353, 4877， ,6707，7315, 7925 , 9144, 10973

(11, 16, 22 . 24.  26, 30. 36) 30 (1 3/16 ) SR 41.3+0.127-0.254        (1.625+0.005-0.010) 22(7/8)

38 38. 1 (1 1/2） 4877, 6707，7315, 7925. 9144. 10973

(16, 22. 24,  26, 30. 36) 35（1 3/8）PR 一 25(1)

38 38. 1 (1 1/2）rod-upset on one end 4877, 6707，7315, 7925. 9144. 10973

(16, 22. 24,  26, 30. 36) 40（1 9/16）SR 57.2+0.381-0.381 (2.250+0.015-0.015) 29(1 1/8)

Mechanical Property OF Stainless steel polished rod:

Mechanical Property OF Steel Polished Rod

GRADE Minimum Yield Strength(0.2% Residual Deformation） Minimum Tensile Strength Maxmum Tensile Strength Elongation200mm% Reduction of Area Z% HRC HB Fatigue Life

psi MPa psi MPa psi MPa ≥13 ≥50 ≥1.0X106

C 60000 414 90000 621 115000 793 ≥13 ≥50

D 85000 586 115000 793 140000 965 ≥13 ≥50

KD 85000 590 115000 795 140000 965 ≥13 ≥50

H 115000 795 140000 965 173339 1195 ≥13 ≥45

EHL / / 188500 1300 217500 1500 / / ≥50 ≥320 ≥2.5X106

Note: When the minimum yield strength cannot be measured, it should be considered to be processed into standard sample and install  extensometer to measure.

a It is generally made of high quality carbon steel, which can reach the mechanical properties of the table

             b A molybdenum steel (but not limited to this type of steel) is generally used, and the effective heat treatment can achieve the mechanical properties of this table

Chemical Composition OF Commonly Used Sucker Rod:

Chemical Composition OF Commonly Used Sucker Rod

AISI C Si Mn P S Cr Ni Mo V Cu Al

4130 0.26-0.33 0.17-0.37 0.4-0.7 ≤0.025 ≤0.025 0.8-1.1 ≤0.3 0.15-0.25 / ≤0.2 /

4140 0.38-0.45 0.17-0.37 0.5-0.8 ≤0.025 ≤0.025 0.9-1.2 ≤0.3 0.15-0.25 0.04-0.09 ≤0.2 /

4142 0.38-0.45 0.17-0.37 0.5-0.8 ≤0.025 ≤0.025 0.9-1.2 ≤0.3 0.15-0.25 0.04-0.09 ≤0.2 /

4330 0.3-0.35 0.15-0.35 0.8-1.1 ≤0.025 ≤0.025 0.8-1.1 1.65-2.0 0.2-0.3 0.05-0.10 ≤0.2 /

4720 0.19-0.23 0.15-0.35 0.85-1.05 ≤0.025 ≤0.025 0.8-1.05 0.9-1.2 0.22-0.30 0.02-0.05 0.40-0.60