 Origin |
China |
Spiral drill collars are made of 4145H modified chromium molybdenum alloy steel.
Standard: API Spec 7-1...
1. The products are conformity with AP1 SPEC 7 Standard.
2. The heat treatment technique is conducted within the range of full length of
products.
3. The bottom of thread of drill collars can be processed with cold roller
according to the customers' requirements.
4. All of the threads are treated with phosphorization and copper plating.
5. The rolled or forged AISI 4145H chrome molybdenum steel is used, which can
keep effective control to the chemical compositions and microelements.
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