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Sucker rods are manufactured according to API 11B Specifications. Currently, we 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
| 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 |
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
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 |
3. Packaging and Storage
The sucker rods are then coated with rust inhibitors and carefully palletized in bundles for safe transport and handling.
*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 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.
Restructured from SINOPEC in 1997, Puyang Zhongshi Group Co., Ltd has 18 years manufacturing experience of petroleum machinery products till now, we have competitive prices of our main products of pumping unit,wellhead and Christmas tree,Subsurface sucker rod pump,Casing accessories like bow spring centralizer, solid rigid centralizer,float equipment, cementing plug etc.
We have 9 factories, more than 500 employees, and many kinds of production equipments.
We have certificates of API 5CT,6A,10D,11AX,11E, ISO 14001 and 9001.
With 10 years exporting experience,we have exported to more than 30 countries such as America,Canada,Russia,Venezuela,Columbia,Thailand,Indonesia ,UAE,Saudi Arabia,Kazakhstan etc.
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