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High-nitrogen austenitic stainless steel for high-performance non-magnetic drill collar and manufacturing method thereof

A non-magnetic drill collar, nitrogen austenitic technology, applied in the field of stainless steel, can solve the problems of deterioration of plasticity and toughness of stainless steel, achieve excellent resistance to pitting corrosion, excellent resistance to intergranular corrosion, and reduce production costs

Active Publication Date: 2017-01-25
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the contrary, the addition of Mo element will lead to the formation of some brittle precipitates such as sigma phase or chi phase, which seriously deteriorates the plasticity and toughness of stainless steel

Method used

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  • High-nitrogen austenitic stainless steel for high-performance non-magnetic drill collar and manufacturing method thereof
  • High-nitrogen austenitic stainless steel for high-performance non-magnetic drill collar and manufacturing method thereof
  • High-nitrogen austenitic stainless steel for high-performance non-magnetic drill collar and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Example 1: Effect of C element content on the intergranular corrosion performance of high-nitrogen austenitic stainless steel for high-performance non-magnetic drill collars

[0080] A total of 5 high-performance non-magnetic high-nitrogen austenitic stainless steel samples with different C element contents were prepared (Table 2), including 2 comparison samples for comparison tests; and according to the standards of the American Society for Testing and Materials The A and E methods of ASTM-A262 tested its intergranular corrosion performance.

[0081] Table 2 Sample numbers and main components of high-nitrogen austenitic stainless steel for high-performance non-magnetic drill collars with different C content

[0082] Sample furnace number C Cr Mo N Nb Ni mn Si S P Fe Furnace-1 0.022 21.91 0.81 0.66 0.45 2.04 16.11 0.18 0.006 0.015 margin Furnace-2 0.027 21.87 0.76 0.68 0.42 1.98 16.59 0.12 0.003 0.012 margin ...

Embodiment 2

[0088] Example 2: Effect of Cr element content on the intergranular corrosion performance of high-nitrogen austenitic stainless steel for high-performance non-magnetic drill collars

[0089] A total of 6 high-performance non-magnetic high-nitrogen austenitic stainless steel samples with different Cr content were prepared (Table 4), including 5 comparison samples for comparison tests; and according to the standards of the American Society for Testing and Materials The A and E methods of ASTM-A262 tested its intergranular corrosion performance.

[0090] Table 4 Sample numbers and main components of high-nitrogen austenitic stainless steel for high-performance non-magnetic drill collars with different Cr content

[0091] Sample furnace number C Cr Mo N Nb Ni mn Si S P Fe Furnace-1 0.032 21.91 0.81 0.66 0.45 2.04 16.11 0.18 0.006 0.015 margin Furnace-6 0.037 21.47 0.76 0.68 0.42 1.98 16.59 0.18 0.004 0.016 margin Fu...

Embodiment 3

[0097] Example 3: Effect of Nb element content on the intergranular corrosion performance of high-nitrogen austenitic stainless steel for high-performance non-magnetic drill collars

[0098] A total of 6 kinds of high-nitrogen austenitic stainless steel samples for non-magnetic drill collars with different Nb content were prepared (Table 6), including 5 kinds of comparison samples for comparison tests; and according to the standards of the American Society for Testing and Materials The A and E methods of ASTM-A262 tested its intergranular corrosion performance.

[0099] Table 6 Sample numbers and main components of high-nitrogen austenitic stainless steel for high-performance non-magnetic drill collars with different Nb content

[0100] Sample furnace number C Cr Mo N Nb Ni mn Si S P Fe Furnace-1 0.032 21.91 0.81 0.66 0.45 2.04 16.11 0.18 0.006 0.015 margin Furnace-11 0.037 21.87 0.76 0.68 - 1.98 16.59 0.13 0.004 0.012...

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Abstract

The invention provides high-performance and high-nitrogen austenitic stainless steel for a non-magnetic drill collar and a manufacturing method thereof, and belongs to the technical field of stainless steel. The stainless steel comprises components in percentage by weight as follows: larger than or equal to 21.5% and smaller than or equal to 22.5% of Cr, larger than or equal to 0.5% and smaller than or equal to 1.5% of Mo, smaller than or equal to 0.040% of C, larger than or equal to 0.65% and smaller than or equal to 0.75% of N, larger than or equal to 0.40% and smaller than or equal to 0.50% of Nb, larger than or equal to 1.95% and smaller than or equal to 2.05% of Ni, larger than or equal to 16.0% and smaller than or equal to 17.0% of Mn, smaller than or equal to 0.20% of Si, smaller than or equal to 0.020% of P, smaller than or equal to 0.010% of S and the balance of Fe, wherein the sum of weight percentage of Cr, a product obtained by multiplying the weight percentage of Mo by 3.3 and a product obtained by multiplying the weight percentage of N by 16.0 is larger than or equal to 33.0%. The manufacturing method of the high-performance and high-nitrogen austenitic stainless steel comprises the steps as follows: smelting by an electric furnace, argon oxygen decarburization for secondary refining, electroslag remelting, cogging by a fast forging machine, forming by a radial forging machine and water cooling treatment. The high-performance and high-nitrogen austenitic stainless steel for the non-magnetic drill collar has the advantages of good room-temperature strength as well as excellent spot corrosion resistance and intercrystalline corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of stainless steel, in particular to a high-nitrogen austenitic stainless steel for high-performance non-magnetic drill collars and a manufacturing method thereof. Background technique [0002] Non-magnetic drill collars are an important part of today's high-precision, high-depth oil and gas drilling equipment, and one of the main components of the drill string, which can provide drilling pressure to the drill bit and improve the rigidity of the drill string. At present, the common non-magnetic drill collars are made of stainless steel with very low magnetic permeability, and the cross-section of the pipe body is circular inside and outside. Due to the needs of exploration and development, the drilling speed of drilling equipment is constantly accelerating, and the depth of drilling is also increasing. It is necessary to install measurement-while-drilling instruments and equipment to correct the vertical dir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C21D8/00
CPCC21D8/005C21D2211/001C22C38/001C22C38/44C22C38/48C22C38/58E21B17/16
Inventor 屈华鹏郎宇平陈海涛
Owner CENT IRON & STEEL RES INST
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