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Kelly is located in the top of the drill string, with square and hexagonal. In rotary drilling, when it is drilling, kelly connected with square bushing and rotary bushing, transfer the ground rotary torque to drill pipe and to drive the drill bit,bearing the weight of the drill string.In the drilling of the turbine and screw, the weight of the drill string and the counter torque are supported.
Mechanical Property | ||||||||||||||||
Outside Diameter Range | Yield Strength | Tensile Strength | Elongation | HB | Charpy impact | |||||||||||
mm | in | MPa | Psi | MPa | Psi | A% | Akv J | |||||||||
79.4~171.4 | 3-1/8~6-3/4 | ≥758 | ≥110000 | ≥965 | ≥140000 | ≥13 | 285~341 | ≥54 | ||||||||
177.8 | 7 | ≥689 | ≥100000 | ≥930 | ≥135000 | ≥13 | 285~341 | ≥54 | ||||||||
Under special conditions, the impact work of the charpy can be determined as greater than 70J according to the supply and demand |
1) How can I place order?
A: You can contact us by email about your order details, or place order on line.
2) How can I pay you?
A: After you confirm our PI, we will request you to pay. T/T and Western Union are the most usual ways we are using.
3) What's the order procedure?
A: First we discuss order details, production details by email or TM. Then we issue you an PI for your confirmation. You will be requested to do pr -epaid full payment or deposit before we go into production. After we get the deposit, we start to process the order. We usually need 15-25days if we don't have the items in stock. Before production has been finished, we will contact you for shipment details, and the balance payment. After payment has been settled, we start to prepare the shipment for you.
4)How do you take care when your clients received defective products?
A: replacement. If there are some defective items, we usually credit to our customer or replace in next shipment.
5)How do you check all the goods in the production line?
A: We have spot inspection and finished product inspection. We check the goods when they go into next step production procedure.
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