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| Product Name: |
Drill Collars
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| Supply Ability: |
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| Related proudcts |
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| Specifications |
3 1/8"-11" |
| Price Term: |
FOB |
| Port of loading: |
Shanghai |
| Minimum Order |
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| Unit Price: |
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Materials
Drill collars are manufactured from AISI 4145H modified steel, and are supplied in the ¡°as rolled¡± surface finish condition. Alternative surface finishes are available.
Trepanning and Heat Treatment
Drill collars are trepanned and drifted to API Spec 7-1. Full-length heat-treatment processes ensure that mechanical properties meet or exceed API Spec 7-1 requirements. A hardness range of 285-341, Brinell hardness and Charpy ¡°V¡± notch minimum i***ct strength of 40 ft-lb at 70¡ăF are guaranteed one inch below the surface.
Traceability
Drill collar material and process traceability are maintained from receipt of the mill¡¯s certified raw material to completion of manufacturing. Serial numbers are die stamped on bar bodies.
Rigid Inspection Procedures
We inspect all our drill collars to ensure compliance with API standards. These inspections include visual dimensional checks as well as ultrasonic inspections over the entire body of the drill collar.
Cold Rolling
Drill collar thread roots, as well as elevator recess upper radius, are cold-rolled. Cold rolling creates a compressive recess upper radius stress condition that increases fatigue life by minimizing crack initiation.
Phosphate-coated or Copper Plating
All connections are phosphate-coated or copper plated to improve resistance to corrosion.
Slip Groove, Elevator Groove and Size
Our co***ny offers optional slip and elevator recesses to improve handling efficiency and safety. Unless otherwise specified, slip and elevator recesses are machined in compliance with API RP 7G guidelines.
Thread Protectors
Our co***ny offers steel, cast steel and plastic steel thread protectors for its drill stem products.
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| Company: |
Shanghai Garrison Oil Pipes Co.,Ltd.
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| Contact: |
Mr. Xing Guo |
| Address: |
Room2608, No.2,Sanjiu Mansion, No.181,East Wenshui Rd,Hongkou District |
| Postcode: |
200437 |
| Tel: |
86-21-55391287 |
| Fax: |
86-21-55391287-8003 |
| E-mail: |
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