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A kind of nonmagnetic stainless steel with high molybdenum content and its manufacturing method

A non-magnetic stainless steel and manufacturing method technology, applied in the field of special steel manufacturing, can solve the problems of short service life, unusable, low pitting index, etc., and achieve the effect of reducing production costs

Active Publication Date: 2017-03-29
LUOYANG SUNRUI SPECIAL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this patent are: ①The high N content cannot be smelted by conventional technology, and the smelting process is difficult to control; ②Cr, Mn, Mo and other ferrite elements are high, and the austenite-forming element Ni content is low, which cannot be compared with The element balance of ferrite is formed, and the structure stability is poor; ③The N content is high, and the Ni content is low. During the smelting and solidification process, nitrogen pores are easily formed, which reduces the performance of the steel; ④The manufacturing process is only a thermal processing process, which cannot Obtain a better organizational structure, the fatigue resistance of the product is poor, and the service life of the product is short
The disadvantages of this patent are: ① high carbon content, pitting corrosion index PRE≤27, poor corrosion resistance, cannot be used in corrosive medium environment; ② low N content, low yield strength, low material hardness, cannot be used in harsh environments , the product life is short
The disadvantages of this patent are: ①The Mo content is low, and the local corrosion resistance of the material is poor; ②The minimum value of the pitting index PRE is 19, which cannot guarantee the corrosion resistance of the material; ③The material has low strength and low hardness, and cannot be used in harsh environments. Use; ④ There is no evaluation of the fatigue resistance of the material, and the service life of the product is short
The disadvantages of this patent are: ①The pitting index PRE is low, which cannot guarantee the material has good corrosion resistance; ②The material has low strength and hardness, and cannot be used in harsh environments; ③There is no evaluation of the fatigue resistance of the material , the product life is short

Method used

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  • A kind of nonmagnetic stainless steel with high molybdenum content and its manufacturing method
  • A kind of nonmagnetic stainless steel with high molybdenum content and its manufacturing method
  • A kind of nonmagnetic stainless steel with high molybdenum content and its manufacturing method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] First, the electrode with a diameter of 310mm and a length of 3100mm is refined in an intermediate frequency induction furnace and an argon-oxygen decarburization (AOD) furnace, and the oxide scale on the electrode surface is cleaned, and then electroslag remelting (ESR) is used to smelt the diameter For a steel ingot with a length of 450mm, a length of 1300mm, and a weight of 1700kg, the electroslag remelting process is:

[0035] 1) The selected slag component and weight percentage are:

[0036] CaF 2 62%, Al 2 o 3 15%, CaO 15%, SiO 2 3%, MgO 5%, the slag is 70kg, the slag baking temperature is 800℃, and the baking time is 8 hours;

[0037] 2) System the baked slag according to CaF 2 , MgO, SiO 2 , CaO, Al 2 o 3 The sequence is added to the crystallizer, the arc is ignited and the slag is formed, and the slagging time is 40 minutes;

[0038] 3) Move the consumable electrode into the liquid slag pool, start electroslag remelting, and the melting speed of the el...

Embodiment 2

[0058] First, the electrode with a diameter of 310mm and a length of 3100mm is refined in an intermediate frequency induction furnace and an argon-oxygen decarburization (AOD) furnace, and the oxide scale on the electrode surface is cleaned, and then electroslag remelting (ESR) is used to smelt the diameter For a steel ingot with a length of 450mm, a length of 1300mm, and a weight of 1700kg, the electroslag remelting process is:

[0059] 1) The selected slag component and weight percentage are:

[0060] CaF 2 65%, Al 2 o 3 15%, CaO 10%, SiO 2 4%, MgO 6%, the slag is 70kg, the slag baking temperature is 800℃, and the baking time is 9 hours;

[0061] 2) System the baked slag according to CaF 2 , MgO, SiO 2 , CaO, Al 2 o 3 The sequence is added to the crystallizer, the arc is ignited and the slag is formed, and the slagging time is 45 minutes;

[0062] 3) Move the consumable electrode into the liquid slag pool, start electroslag remelting, and the melting speed of the el...

Embodiment 3

[0082] First, the electrode with a diameter of 310mm and a length of 3100mm is refined in an intermediate frequency induction furnace and an argon-oxygen decarburization (AOD) furnace, and the oxide scale on the electrode surface is cleaned, and then electroslag remelting (ESR) is used to smelt the diameter For a steel ingot with a length of 450mm, a length of 1300mm, and a weight of 1700kg, the electroslag remelting process is:

[0083] 1) The selected slag component and weight percentage are:

[0084] CaF 2 68%, Al 2 o 3 14%, CaO 12%, SiO 2 2%, MgO 5%, the slag is 70kg, the slag baking temperature is 800℃, and the baking time is 10 hours;

[0085] 2) System the baked slag according to CaF 2 , MgO, SiO 2 , CaO, Al 2 o 3 The sequence is added to the crystallizer, the arc is ignited and the slagging time is 50 minutes;

[0086] 3) Move the consumable electrode into the liquid slag pool, start electroslag remelting, and the melting speed of the electrode is 370kg / h;

...

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Abstract

The invention belongs to the technical field of special steel manufacturing, and relates to a non-magnetic stainless steel with high molybdenum content and a manufacturing method thereof. A proposed non-magnetic stainless steel with high molybdenum content is forged from a steel ingot; the element composition and weight percentage of the steel ingot are: C≤0.06%, Si≤0.5%, S≤0.01%, P≤0.02%, 19%≤Cr ≤20%, 19%≤Mn≤20%, 1.5%≤Mo≤2.5%, 0.03%≤V≤0.08%, 0.03%≤Nb≤0.05%, 3%≤Ni≤5%, 0.6%≤N≤0.65 %, O≤0.004%, and the rest are unavoidable impurities and Fe. The invention improves the strength, toughness and fatigue strength of the material; ensures that the molten steel passes through the single-phase austenite region during the solidification process, avoids the formation of ferrite phase during the solidification and forging process, and improves the non-magnetic performance of the material.

Description

technical field [0001] The invention belongs to the technical field of special steel manufacture, and in particular relates to a non-magnetic stainless steel with high molybdenum content and a manufacturing method thereof. Background technique [0002] During the drilling process, due to changes in the geological environment, the inclination angle and azimuth are constantly changing. In order to prevent deviation from the target layer during the drilling process, the inclination angle and azimuth must be measured at any time to ensure that the drilling can accurately reach the target layer along the predetermined azimuth. This has led to the application of non-magnetic stainless steel in the field of oil exploration. Non-magnetic stainless steel is used to make thick-walled non-magnetic drill collars. During drilling operations, the magnetic compass is placed in it, so as to avoid being affected by the nearby ferromagnetic drill string and ensure the compass. Accurately indi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C21D6/00C21D8/00
Inventor 王新鹏王灵水范芳雄杨俊峰
Owner LUOYANG SUNRUI SPECIAL EQUIP
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