Sucker Rods

Our sucker rods are manufactured according to API 11B Specifications. Currently, the Company market 3 types of API sucker rods Grade D Alloy and Grade D Special which are formulated from different alloys：AISI 4130 (Grade D), AISI 4142 (Grade D) and AISI 4720 (Grade KD).

Manufacturing Process:

1. Rod Bar
The incoming rod bars are inspected for any damage, fault and discontinuities.Before arranging the rod bars for production process, carry out chemical composition testing, dimensional inspection & surface quality inspection. High quality standard is maintained at various stage inspections.
Chemical Composition: See below table.
2. Manufacturing
Rod bars are manufactured from hot rolled alloy steel. Rod bars are machine straightened and cold drawn to the required size. The rod bar ends are hot forged according to API designed sizes. The rods are then heat treated over the full length.As per requirement of mechanical properties, the rods are normalized and tempered to the specified level or quenched and tempered to the required hardness and strength. Care is taken to achieve metallographic structure with no residual stresses in the rod.A sample specimen is cut from the heat treated material and is tested for ultimate tensile strength, yield strength and elongation. The rod is then again checked for straightness. The forged ends are properly aligned with its body. Rods are cleaned by shot-blasting to remove any scale and oxidation. The forged ends are machined on C.N.C. Lathe machines as per API dimensions and checked with API approved gauges.
Mechanical Properties: See below table.
3. Packaging and Storage
The sucker rods are then coated with rust inhibitors and carefully palletized in bundles for safe transport and handling.
Table: Chemical Composition / Mechanical Properties / Heat Treatment

Chemical Composition

AISI Grade AISI4130 AISI4142 AISI4720 API Grade D D KD Carbon 0.26~0.33 0.38~0.45 0.19~0.23 Manganese 0.40~0.70 0.80~1.00 0.80~1.05 Phosphorus 0.025 MX 0.025 MX 0.025 MX Sulphur 0.025 MX 0.025 MX 0.025 MX Silicon 0.17~0.37 0.15~0.35 0.15~0.35 Copper 0.25 MX 0.35 MX 0.20MX Nickel 0.30MX 0.45 MX 0.90~1.20 Chromium 0.80~1.10 0.80~1.10 0.80~1.05 Molybdenum 0.15~0.25 0.15~0.25 0.24~0.30 Vanadium 0.03~0.07 0.03~0.07 0.03~0.07

Mechanical Properties

AISI Grade AISI4130 AISI4142 AISI4720 API Grade D D KD Yield Strength 0.2% offset, PSI 85,000 85,000 85,000 (MPa) (586) (586) (586) Ultimate Tensile Strength, PSI 115,000 – 140,000 115,000 – 140,000 115,000 – 140,000 (MPa) (793 – 965) (793 – 965) (793 – 965) Elong., δ % ≥10 Rod Size, OD 5/8″, 3/4″, 7/8″, 1″,11/8″ (mm) (15.88), (19.05), (22.23), (25.40) , (28.58) Rod Length 25’, 30’ (+/- 2.0″per API requirement) (m) (7.62), (9.14) (+/- 50.80mm per API requirement)

Heat treatment

AISI Grade AISI4130 AISI4142 AISI4720 API Grade D D KD Heat treatment Quenched; Normalized; Normalized; Tempered Tempered Tempered

*Nine-Ring reserves 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 sucker rod physical requirement of API Specification 11B. All other physical properties are expected values only and Nine-Ring reserves the right to deviate from the above listed values.