API Polished Rod

Polished rod is an important link for connecting between the pumping unit and rod string in the oil well. Currently, we offer 2 types of polished rod formulated from different alloys: AISI 4130 and AISI 4140.
The polished rod is the uppermost joint in the string of sucker rods used in a rod pump artificial-lift system. The polished rod enables an efficient hydraulic seal to be made around the reciprocating rod string.
Currently, polished rods are made from AISI 4130 and 4140 alloy steel.

1.API Polished Rod

                                                  Chemical Composition

Steel

AISI 4140

C

0.40

Si

0.23

Mn

0.62

P

0.016

S

0.007

Cr

1.03

Ni

0.03

Mo

0.16

Cu

0.06

W

0.008

V

0.01

Ti

0.008

Mechanical  Properties
Yield Strength    0.2% offset, PSI85,000

(MPa)

(586)

Ultimate Tensile    Strength, PSI

115,000 – 140,000

(MPa)

(793 – 965)

Elong., δ %

≥10

Rod Size, OD

1″,    1-1/8″, 1-1/4″

(mm)

(25),    (28), (31.75)

Rod Length

25’, 30’?    (+/- 2.0″per API requirement)

(m)

(7.62), (9.14)    (+/- 50.80mm per    API requirement)

* We reserve the right to deviate from the above listed percentages of a particular chemical element of a grade of steel, however we will always adhere to the requirements of API Specification 11B.
Tensile value is the only steel polished rod physical requirement of API Specification 11B. All other physical properties are expected values only and we reserve the right to deviate from the above listed values. 

2.API Metal Sprayed Polished Rod

                                           Coating Chemical Properties, %

C

≤0.4

Si

2.0~3.5

B

1.5~2.5

Cr

7~10

Fe

≤4

O

≤0.08

Ni

Balance

Except coating chemical composition,metal sprayed polished rod diameters, dimensions and tolerance are same as normal polished rod.

Roller Sucker Rod Guide

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API Pony Rod
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