ESTIMATION OF STRESS-DEFORMED STATE OF METAL OF A PIPELINE WITH WELDED SEAMS BY COERCIVE FORCE

The main magnetic parameters sensitive to the structure of steels are the parameters of their saturation loop of magnetic hysteresis: the coercive force Hcs and remanent magnetization Mrs. The saturation magnetization or saturation intensity Mr is most sensitive to the phase composition of steels. The variety of steel grades and modes of technological treatment (e.g., heat treatment, mechanical load) determined the use of magnetic structurescopy and magnetic characteristics — the coercive force Hc, remanent magnetization Mr , and specific hysteresis losses Wh on the subloops of the magnetic hysteresis of steels — as control parameters in diagnostics of the stressed and structural states of steel structures and pipelines. It has been shown that changes in Hc, Mr , and Wh are more sensitive to structural stresses and structures of steels than the parameters of the saturation hysteresis loop of magnetic hysteresis (Hcs, Mrs, and Mrs). The formulas for calculating Hc, Mr and Wh are presented to be used for estimation of changes in the parameters upon heat treatment of steels. Features of the structural sensitivity of the subloop characteristics and expediency of their use for magnetic structural and phase analyzes are determined. Thus, the range of changes in Ìr attributed to the structural changes in steels upon gradual Hm decrease is many times wider compared to the range of possible changes in Mrs under the same conditions. Conditions (relations between the magnetic parameters) and recommendations regarding the choice of the field strength Hm are given which provide the justified use of Hc, Mr and Wh parameters in magnetic structurescopy

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Study of stressed-deformed state of two joint centrifugal-volumetric-reinforced teeth of cutting structures of rolling-cutter drill bits

Construction of Oil and Gas Wells on Land and Sea ◽

10.30713/0130-3872-2018-9-42-48 ◽

2018 ◽

pp. 42-48

Author(s):

D.Yu. Serikov ◽

◽

R.F. Gaffanov ◽

Keyword(s):

Drill Bits ◽

Deformed State

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MANUFACTURE INVESTIGATION OF CARTRIDGE WITH BOTTOM-MOST PART FLANGE BY DIRECT EXTRUSION WITH COUNTERPUNCH. REPORT 13. DETERMINATION OF DEFORMED STATE UNDER STRAITENED EXTRUSION IN FOURTH CENTRAL AREA OF PLASTIC DEFORMATION

Technology of metals ◽

10.31044/1684-2499-2020-0-4-43-51 ◽

2020 ◽

Vol 0 (4) ◽

pp. 43-51

Author(s):

A. L. Vorontsov ◽

◽

I. A. Nikiforov ◽

Keyword(s):

Plastic Deformation ◽

Plastic Flow ◽

Central Area ◽

Direct Extrusion ◽

Deformed State ◽

Cumulative Deformation ◽

The Given ◽

General Method

Formulae have been obtained that are necessary to calculate cumulative deformation in the process of straitened extrusion in the central area closed to the working end of the counterpunch. The general method of plastic flow proposed by A. L. Vorontsov was used. The obtained formulae allow one to determine the deformed state of a billet in any point of the given area. The formulae should be used to take into account the strengthening of the extruded material.

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BLENDALLOY 25-7904

Alloy Digest ◽

10.31399/asm.ad.ni0181 ◽

1972 ◽

Vol 21 (11) ◽

Keyword(s):

Corrosion Resistance ◽

Coercive Force ◽

Physical Properties ◽

Surface Treatment ◽

Tensile Properties ◽

Heat Treating ◽

Magnetic Shielding ◽

High Permeability ◽

Magnetic Cores ◽

Very High

Abstract BLENDALLOY 25-7904 is an 80% nickel-15% iron-5% molybdenum alloy having very high permeability and low coercive force for magnetic cores in such applications as transformer laminations, sensitive magnetic amplifiers and magnetic shielding. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ni-181. Producer or source: Spang Industries Inc..

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ANCORSTEEL PHOSPHORUS ALLOYS

Alloy Digest ◽

10.31399/asm.ad.cs0196 ◽

2016 ◽

Vol 65 (2) ◽

Keyword(s):

Coercive Force ◽

Physical Properties ◽

Tensile Properties ◽

Powder Metal ◽

Iron Powders ◽

Electromagnetic Performance

Abstract Ancorsteel phosphorus alloys are ferrous base powders for PM parts requiring superior electromagnetic performance. Compared with parts made from pure, high compressibility iron powders, those made from the phosphorus alloys have higher resistivity, permeability and induction, and reduced coercive force. The presence of phosphorus also decreases the susceptibility of a PM component to nitrogen aging. These alloys are produced by making ferrophosphorus additions to the highly compressible iron powders Ancorsteel 1000B or Ancorsteel 1000C. This datasheet provides information on physical properties, and tensile properties. It also includes information on powder metal forms. Filing Code: CS-196. Producer or source: Hoeganaes Corporation.

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RAECO-15

Alloy Digest ◽

10.31399/asm.ad.co0067 ◽

1972 ◽

Vol 21 (12) ◽

Keyword(s):

Curie Temperature ◽

Coercive Force ◽

Physical Properties ◽

Elevated Temperatures ◽

Heat Treating ◽

Energy Product ◽

Magnet Alloy

Abstract RAECO-15 is a magnet alloy of samarium and cobalt which offers 15-million energy product, an extremely high intrinsic coercive force (Hci = 15,000 Oe), and a Curie Temperature of 750 C. It is especially attractive for use in severe demagnetizing environments at elevated temperatures. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on forming, heat treating, machining, and joining. Filing Code: Co-67. Producer or source: Raytheon Microwave and Power Tube Division.

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MAGIVAL MG2

Alloy Digest ◽

10.31399/asm.ad.ss1161 ◽

2013 ◽

Vol 62 (11) ◽

Keyword(s):

Stainless Steel ◽

Corrosion Resistance ◽

Coercive Force ◽

Magnetic Permeability ◽

Stainless Steels ◽

Heat Treating ◽

Steel Grade ◽

High Permeability ◽

Ferritic Stainless Steels ◽

Magnetic Applications

Abstract MAGIVAL MG2 is a free machining ferritic stainless steel grade with the same high machinability and corrosion resistance as type 430F, but offering a higher magnetic permeability and lower coercive force than MG1 (Alloy Digest SS-1159, October 2013). Magival is a group of easily workable ferritic stainless steels developed for magnetic applications where high permeability and low coercive force are required. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-1161. Producer or source: Valbruna Stainless Steel.

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