Basic Info.
AISI SAE 4140 Forged Q+T Boring/Drill Alloy Steel Hollow Bar
Multiple AISI/SAE standard alloy steel materials are available including forged bar diameters 80-500mm, boring hole diameters 10-250mm, and maximum boring lengths of 14 meters.
Product Advantages
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Boring one side: Ensures no step in the boring bar for superior structural integrity.
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High-tech Boring Equipment: Guaranteed straightness, roughness, tiny tolerance, and roundness.
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Stable Mechanical Properties: Materials undergo a precise QT (Quenched and Tempered) process.
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Standard Compliance: Chemical components adhere 100% to American standards.
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Rigorous Testing: UT and drift tests are performed for each individual piece.
Service Capabilities
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Decades of production experience in QT/Boring processes with strict quality management systems (ISO NQA 9001).
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API certified manufacturer with extensive history serving global oil and gas sectors.
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Professional steel industry expertise and fluent communication for international requirements.
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Support for variety of payment methods and third-party inspection organizations.
Chemical Properties
| Grade |
C |
Cr |
Mn |
Si |
Mo |
S |
P |
| 4140 |
0.38-0.43% |
0.80-1.10% |
0.75-1.0% |
0.15-0.30% |
0.15-0.25% |
0-0.040% |
0-0.035% |
Technical Specifications
| Product Name |
Forged QT Boring Alloy Steel Bar For Oil Services |
| Specification |
API 5CT/5CP/6A |
| Steel Grade |
4130, 4140, 4145, 4145H, 4330V, 4137, 4340 |
| Process |
Hot Forged + QT + Boring |
| Forged Bar Diameter |
8-500mm |
| Boring Hole Diameter |
10-250mm |
| Max Length |
14 meters |
| Inspection |
Size, Chemical, Mechanical, UT, Drift Test, Low/High Temp. Impact |
| Certificate |
MTC, CO/FE/FA, BV/SGS |
| Trade Terms |
FOB CIF CFR PPU PPD |
| Packaging |
Loose/Bundle/Wooden Pallet/Wooden Box/Plastic Cloth Wraps/Plastic End Caps |
Frequently Asked Questions
● What is the maximum length available for the boring bars?
We can supply forged QT boring bars with a maximum length of up to 14 meters.
● Which steel grades are supported for the hollow bars?
Our production covers a wide range of grades including AISI 4130, 4140, 4145, 4145H, 4330V, 4137, and 4340.
● What quality certifications do these products hold?
Our products comply with API 5CT, 5CP, and 6A specifications. We also provide MTC and facilitate BV or SGS inspections.
● What tests are performed to ensure quality?
Every piece undergoes size measurement, chemical and mechanical analysis, Ultrasonic Testing (UT), Drift Testing, and Low/High Temperature Impact tests.
● Can the boring be done through the entire length?
Yes, we utilize high-tech boring equipment to ensure excellent straightness and roughness with no steps in the boring bar, even when boring from one side.
● What is the standard delivery time for orders?
Depending on the order volume (MOQ 1-5 tons), delivery typically takes between 10 to 30 days.
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