A kind of steel for drilling pump air bag and its production method

Abstract

The invention provides steel for an air chamber of a drilling pump and a production method of the steel. The steel comprises chemical components as follows: 0.29%-0.33% of C, 0.15%-0.35% of Si, 0.50%-0.60% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.010% of S, 0.95%-1.10% of Cr, 0.15%-0.25% of Ni, 0.15%-0.25% of Mo, 0.010%-0.025% of V, 0.015%-0.030% of Nb, 0.0060%-0.0100% of N, 0.018%-0.032% of Al and the balance iron and inevitable impurity elements. Compared with the prior art, by means of composition design of multi-element micro-alloying, forging waste heat isothermal annealing and heat treatment process optimization and on the premise of guaranteeing reliable quality of the air chamber, a normalizing procedure before quenched-tempered heat treatment is eliminated, the production cycle of the air chamber is shortened, and the heat treatment cost of users is reduced.

Description

technical field [0001] The invention belongs to the technical field of metallurgical iron and steel materials, and in particular relates to a steel for an air bag of a drilling pump and a production method thereof. Background technique [0002] The drilling pump is an important part of the drilling rig circulation system, also known as the mud pump. In order to reduce the discharge pressure pulsation amplitude of the drilling pump, thereby significantly improving the performance of the pump and reducing drilling accidents, it is generally used to install it near the pump discharge valve box. Ways to expel air pockets. The air bag is an important part of the hydraulic system of the drilling pump, and its internal gas volume increases or decreases with the change of the gas pressure. Using this characteristic, the air bag can store (or release) more than (or below) the average flow rate Therefore, the pressure pulsation amplitude can be reduced, and the liquid in the drilling...

AI Technical Summary

Problems solved by technology

The patented technology undergoes 2 times of normalizing, many processes and high cost

[0005] It can be seen that the current steel for air cladding mainly has the following problems: there are many subsequent heat treatment processes, normalizing treatment is required before quenching and tempering heat treatment, the production cycle is long, and the cost is high

Canceling the normalizing treatment cannot guarantee that the strength and toughness can meet the requirements.

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