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SFMC provides a full range of inertial friction welding drill pipes in nominal sizes from 2-3/8” to 6-5/8” OD and various steel grades (E-75, X-95, G-105, S-135), which are manufactured in according to API 7, 5D and RP 7G Latest Edition and meeting the customer’s specified requirements.
 SFMC drill pipe performs a strict quality control on manufacturing and inspection process from the initial material selection to final inspection to meet the requirement of the customer. The drill pipe is manufactured with top-quality alloy steel, which SFMC will perform the strict mechanical and chemical re-inspection. The advanced inspection system can precisely detect the defects and check the dimensional tolerance to ensure API required 87.5 minimum percent wall thickness, and even provide 95 percent minimum wall thickness in every pipe.
Tool Joints
SFMC tool joints are made of AISI 4137H premium alloy steel fully Q&T with IPSEN furnace imported from Germany. All tool joints should be inspected by fluorescence magnetic particle and ultrasonic method.
The threads and Bevel shoulders are machined by CNC Lathe and gauged to API specification, which provides interchangeability between various types of connections. All threads are phosphatized or coppered to reduce the possibility of connection galling.
Mechanical property of pipe bofy and tool joints
| Standard |
Steel grade
|
Yield strength Min/Max（ksi）
|
Tensile strength Min (ksi)
|
Hardness
Max
|
Min. Avg Charpy
（ft-lbs @ 75°F）
|
|
API
|
E—75
|
75/105
|
100/-
|
-
|
40
|
|
X—95
|
95/125
|
105/-
|
-
|
40
|
|
G—105
|
105/135
|
110/-
|
-
|
40
|
|
S—135
|
135/165
|
145/-
|
-
|
40
|
|
Tool Joint
|
120/-
|
140/-
|
341HB
|
40
|
|
