Raw material selection: Alloy steel bars that comply with the API SPEC 11B standard are selected.
Material inspection: When entering the warehouse, it is necessary to verify the correspondence between the material report and the batch number of the furnace. Use a spectrometer to recheck the content of elements such as C, Cr, and Mn to ensure that the carbon equivalent is controlled below 0.45%.
Surface defect detection: Magnetic particle inspection is adopted to detect surface defects. Billets with longitudinal crack depth exceeding 0.2mm need to be returned to the warehouse.
Straightening: Use a fully automatic hydraulic straightening machine to straighten the billet to ensure that the straightness deviation is controlled within 0.8mm/m.
Peeling: Perform peeling processing to remove the surface oxide layer. The single-sided cutting allowance shall not be less than 0.5mm, and the roughness Ra value shall be maintained below 3.2μm. The processed billets are stored in the constant-temperature workshop for no more than 48 hours.
Heating: The billet is heated to 1150±20℃ using a medium-frequency induction heating furnace. The holding time is calculated at 1.2 minutes per millimeter of diameter.
Upsetting forming: Upsetting forming is carried out using a 6300kN die forging press, and the preheating temperature of the die should not be lower than 250℃.
Residual heat normalizing treatment: Residual heat normalizing treatment should be carried out immediately after forging, and the air cooling rate should be controlled at 30℃/min.
Quenching: Select No. 32 mechanical oil as the quenching medium, maintain the oil temperature at 60-80℃, and calculate the cooling time at 6 seconds per millimeter of the rod body thickness.
Tempering: Tempering treatment is carried out using a continuous production line with a mesh belt, with the temperature set at 560±10℃ and the holding time at 90 minutes. The hardness of the processed rod body needs to reach HRC28-32.
CNC lathe processing: The fine processing of the rod body is completed in three passes. The rough turning allowance is 1.5mm, and the semi-finish turning allowance is 0.3mm. The cutting tool selected is the hard alloy blade of model WNMG080408. The cutting speed is set at 180m/min and the feed rate is 0.2mm/r.
Thread processing: Thread processing is carried out using comb tool forming technology, with the tooth profile Angle tolerance controlled within ±0.5°.
Cylindrical grinding: Cylindrical grinding machines are divided into two processes: rough grinding and fine grinding. The grit size of the coarse grinding wheel is 60#, and the removal amount is 0.15mm. The WA80K grinding wheel was selected for fine grinding, with a removal rate of 0.03mm. The surface roughness Ra after processing is ≤0.8μm, and the cylindricity error does not exceed 0.01mm.
Shot peening: Cast steel shot medium is used, with a diameter of 0.8mm, shot peening strength of 0.45mmA, and coverage rate of 200%. The residual compressive stress value of the treated surface needs to reach above -650 mpa.
Phosphating treatment: Zinc-based phosphating solution was used for treatment, with a total acidity of 28 points, a free acidity of 3.5 points, a treatment temperature of 75℃, and a duration of 12 minutes. The phosphating film thickness is 6-8μm and it needs to pass the copper sulfate drop test (>3 minutes).
Mechanical property test: Randomly select 3% of samples from each batch for tensile test, with a yield strength of ≥860MPa and a reduction in area of ≥45%.
Fatigue test: The fatigue test was conducted using the three-point bending method, with the loading stress amplitude at 370MPa and the number of cycles >2×10^6 times.
Non-destructive testing: Ultrasonic flaw detection is carried out in accordance with the ASTM E317 standard. A 5MHz straight probe is used. Defects with an equivalent diameter exceeding 1.2mm are judged as non-conforming. Magnetic particle detection uses fluorescent magnetic suspension, and the crack display is observed under a black light lamp.
The API 11B sucker rod, as an important component of the rod-based oil production system in oil fields, is mainly used to connect surface pumping units and downhole pumping pumps to achieve continuous extraction of crude oil. It is widely applied in various oil well environments, including but not limited to the following situations:
1. For light and medium-load Wells with no corrosion or shallow corrosion: C-grade sucker rods are suitable for such environments as they are made of carbon steel or manganese steel.
2. For operations in deep Wells without corrosion or with relatively light corrosive media: D-grade sucker rods are made of high-quality alloy steel, featuring high strength, good plasticity, and long service life, making them suitable for such environments.
3. Deep well and high-power pump production: HL and HY grade sucker rods are also made of high-quality alloy steel, featuring ultra-high strength, making them suitable for environments with high requirements for the strength of sucker rods.
4. Strongly corrosive environment: Sucker rods of grades K, KD and KH are made of high-quality alloy steel with different contents of Ni Cr-Ni-Mo, featuring anti-corrosion and anti-corrosion functions. They are respectively suitable for strongly corrosive environments in shallow Wells, medium Wells and deep Wells.
The specifications of the sucker rods that IBC Group can provide for you are as follows:
| Outer Diameters | 5/8’’ to 1 3/4’’. |
| Grades | C, K, D, KD, HL, HY. |
| Material | AISI 4130M, AISI 4138M, AISI 4330M, AISI 4142M, AISI 8630 |
| Sucker Rods Length | 25 ft or 30 ft |
| Pony Rods Length | 2 ft to 10 ft. |
| Ends Type | Class T coupling, Reduced Diameter, SM coupling. |
| Rods Type | Sucker Rods, Pony Rods, Polished Rods, Sinker Bar, Drive Sucker Rod, Centralized Sucker Rod, Anti-Twist Sucker Rod |
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