API 11B Pony Rod

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1. Introduction of Pony rod

The Pony rods are used to adjust the length of sucker rod string in oil well.


2. Manufacturing specification: API 11B


3. Material

3.1. Chemical Composition

The chemical composition of steel sucker rods and steel  pony rods shall be any composition of AISI series steel , or equivalent ,listed in Table which can be effectively heat treated to the mechanical requirements of grades K.C. and D rods

                Chemical Composition of Pony Rods

Grade

Chemical composition

K

AISI 46XX series steel a

C

AISI 10XX series steel a

AISI 15XX series steel a

D carbon

AISI 10XX series steel a

AISI 15XX series steel a

D alloy

AISI 41XX series steel a

D special

Special alloy shall be any chemical composition that contains a combination of nickel, chromium , and molybdenum that total a minimum of 1.15% alloying content.

Or an equivalent in international series number steel.


3.2. Mechanical Properties

Mechanical Properties of Steel Rods and Pony Rods

Grade

Minimum Yield (0.2% offset)

Minimum Tensile

Maximum Tensile

psi

MPa

psi

MPa

psi

MPa

K

60,000

414

90,000

621

115,000

793

C

60,000

414

90,000

621

115,000

793

D

85,000

586

115,000

793

140,000

965


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