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A kind of vanadium nitrogen microalloyed steel for oil drill string conversion joint

A micro-alloying and oil drilling technology, applied in the field of alloy structural steel, can solve problems such as increasing production costs, and achieve the effects of saving energy and reducing production costs

Active Publication Date: 2018-12-25
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Moreover, although annealing or normalizing before quenching and tempering heat treatment is beneficial to improve its comprehensive performance, it will increase production cost after all. If the annealing or normalizing process can be canceled under the premise of maintaining its comprehensive performance, it can Save energy, reduce cost and increase efficiency

Method used

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  • A kind of vanadium nitrogen microalloyed steel for oil drill string conversion joint
  • A kind of vanadium nitrogen microalloyed steel for oil drill string conversion joint

Examples

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Embodiment Construction

[0021] The technical solutions of the present invention will be further described below in conjunction with the examples.

[0022] The chemical compositions of Examples 1-5 and Comparative Example 1 are shown in Table 1 (smelting analysis, the rest are Fe and unavoidable impurity elements),

[0023] Table 1

[0024]

[0025] The mechanical properties (inspected according to API7-1 standard) of the drill string transition joints made of the steels of Examples 1-5 and Comparative Example 1 are shown in Table 2.

[0026] Table 2

[0027]

[0028] Comparing Examples 1-5 with Comparative Example 1, it can be seen that the performance of the oil drill string adapter made in Examples 1-5 is equivalent to that of Ratio 1, and all meet the API7-1 standard requirements, but Examples 1-5 have no normalizing or The annealing process and the heat treatment process are all prior art, and the proportion 1 is normalizing + quenching and tempering, so energy is saved and production cos...

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Abstract

The invention provides steel for a vanadium-nitrogen micro-alloyed petroleum drill stem changeover sub. The steel comprises the following chemical constituents in percentage by weight: 0.35-0.42% of C, 0.15-0.35% of Si, 0.70-1.00% of Mn, less than or equal to 0.030% of P, less than or equal to 0.025% of S, 0.85-1.20% of Cr, 0.08-0.15% of Ni, 0.25-0.40% of Mo, 0.01-0.040% of V, 0.0045-0.0100% of N, and the balance of ferrous and inevitable impurity elements. Compared with the prior art, the steel for the vanadium-nitrogen micro-alloyed petroleum drill stem changeover sub can cancel the annealing or normalizing procedure unnecessary for thermal treatment of the current drill stem changeover sub on the premise of guaranteeing the quality of the changeover sub product, so that the energy can be saved, and the production cost can be lowered.

Description

technical field [0001] The invention belongs to alloy structural steel, and in particular relates to a vanadium-nitrogen micro-alloyed steel for a conversion joint of a petroleum drill string. Background technique [0002] The oil drill string adapter is a kind of key part in the oil drilling tool products. It has to bear the combined action of strong tension, strong torsion, impact, vibration, rotation, etc. during use, and the service conditions are very harsh. Its safety and reliability requirements are very high, and it must have good mechanical properties, high hardenability, high density and steel purity. [0003] Petroleum conversion joints are generally made of American standard 4137H steel. The chemical composition (weight percentage) of 4137H steel in the American Society for Testing and Materials standard ASTM_A29 / A29M is: C0.35-0.40%, Si0.15-0.35%, Mn0.70- 0.90%, P≤0.035%, S≤0.040%, Cr0.80-1.10%, Mo0.15-0.25%, and the rest are iron and impurity elements. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/18C22C38/12C22C38/08E21B17/02
CPCC22C38/001C22C38/02C22C38/04C22C38/08C22C38/12C22C38/18E21B17/02
Inventor 完颜卫国王自远
Owner MAGANG (GROUP) HOLDING CO LTD