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thursday, 30.08.2018, 18:00 -- welcome -- guest -- crgo -- -- main -- | -- registration -- | -- login -- | rss -- -- crgo crgo info crgo pictures contact us stock -- -- -- -- crgo/ hrgo pictures -- -- -- -- -- -- -- -- -- -- -- search -- -- -- -- -- -- -- -- calendar -- -- -- « august 2018 » su mo tu we th fr sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 -- -- -- -- -- -- -- our poll -- -- -- rate my site excellent good not bad bad awful results | polls archive total of answers: 25 -- -- -- -- -- -- -- statistics -- -- -- total online: 1 guests: 1 users: 0 -- -- crgo main -- -- crgo - cold-rolled grain oriented steel a) history b) terms and definitions c) properties of grains, domains and understanding of hystereses losses d) processing of crgo steel into laminations e) design losses versus actual losses f) grades, nomenclatures and materials g) conclusion a) history the earliest process to manufacture cold rolled grain oriented electrical steel, popularly known as crgo, was first patented 70 years ago in 1933 in usa. the earliest grades of crgo were known as m10, (approx. 1.00 watts/lb. at 1.5t/60hz) and m9 (approx.0.90 watts/lb. at 1.5t/60hz) by 1947, the first catalogue containing design curves and other essential information on grain oriented steels was published. in 1955, grades m7 (approx.0.7w/lb at 1.5t/60hz) and m6 (approx.0.6w/lb at 1.5t/60hz) were developed and were the most widely used grades of crgo. however, the first conventional grain oriented steel (cgos) grades known popularly today as m3, m4 and m5 were developed in the late sixties and the hi-b grain oriented steel grades (hg-os) were developed in the early seventies whilst laser scribed material in the mid-eighties. armco, usa, (now known as a.k. steel) were the pioneers in development of crgo grades whilst the japanese mills nippon steel and kawasaki steel, the pioneers in development of hgo grades and laser scribed grades. in the development of grain oriented steels (crgo) over the past 70 years, not only have the hystereses losses been significantly reduced from the earliest grades of crgo developed, but the thickness has been significantly reduced, thereby reducing the eddy current losses. the insulation coating has been significantly improved to keep inter-laminar losses at a minimum. these improvements in crgo have led to an ever increasing demand of this grade of steel which, though being classified as a "steel" is very rarely impacted by the international price movement or other factors influencing mild steels or other categories of steel products. crgo has provided the opportunity to reduce the size of magnetic cores in electrical equipments as also reducing other materials and thereby reducing the cost whilst improving the efficiency of electrical equipments. there have also been no serious challenges in terms of replacements of crgo for the application in core material in transformers and there is hardly any new material on the horizon either. potential challengers like metglass amorphous boron strip / mu metal /nickel iron etc. have proven to be not quite useful in replacing gos due to various technical problems and have already been relegated for use in special purpose applications (mainly high frequency) only in developed countries. that the producers of these materials have tried to dump this technology on developing countries is another matter altogether, which needs to be discussed separately. therefore, a comprehensive understanding of go steels is necessary, especially in the indian context where crgo steel is seen from the following perspectives by transformer manufacturers (tms) a final balancing item in the costing of transformers. as the competitive pressure on prices of transformers increases, the only maneuverable "a" class item of significant value is crgo core, where costs can be reduced. therefore, tms are forced to downgrade their core to reduce cost. a large quantity of seconds, defectives and used crgo materials are available, thereby complicating the design and purchase decision further. in fact india is known to be one of the largest markets worldwide, for secondary crgo. a lack of sufficient information regarding the design parameters, latest materials, nomenclature leading to outdated core designs, which are rarely upgraded or reviewed. a tendency by sebs to specify the "best" hgo available and stringent documentation and inspection procedures in a bid to improve the core quality. in view of the above, this paper attempts to first explain the various terms associated with crgo steels, the relevant properties, the best processes for fabrication and the relevant check points and some suggestions and conclusions to ensure better core quality. (b) terms and definitions aisi - american iron and steel institute which gave the nomenclature for crgo materials with m as a prefix and a number following (eg. m4, m5, m6 etc.) m indicates magnetic material, and the number following approximately indicated 10 times the core loss of earliest crgo material in watts per lb. at 1.5t and 60 cycles. today however, this number is not relevant, but still denotes the accepted grade and popularly used throughout the world (e.g. m4 denoted magnetic material having core loss of approx.0.4w/lb at 1.5t/60hz). core loss: it is the electrical power lost in terms of heat within the core of electrical equipment, when cores are subjected to ac magnetising force. it is composed of several types of losses - hystereses loss, eddy current loss within individual laminations and inter-laminar losses that may arise if laminations are not sufficiently insulated from each other. eddy current loss: this component of core loss is the energy lost by the circulating current induced in the metal by the variation of magnetic fields in the metal. therefore, more uniform the magnetic field in the metal, lower the eddy current losses. hystereses loss: the power expended in a magnetic material as a result of the lack of correspondence between the changes in induction resulting from the increase or decrease of magnetising force (which is a result of it being cyclic, i.e. alternating) (explained in detail later on in this paper). inter-laminar loss: the power expended in a stacked or wound core as a result of weak insulation resistance between laminations resulting in the flow of eddy current within a core, across lamination sheets. surface insulation resistance: the resistance of a unit area of surface coating measured perpendicular to the surface usually expressed in ohm-cm2 per lamination. surface insulation resistance is considered adequate if the inter-laminar loss is restricted to less than 2% of total core loss. in absolute values it should be greater than or equal to 10 ohms cm2 and it is measured by the franklin test method. saturation induction: the maximum excess of induction possible in given material above that produced in a vacuum by a given magnetising force. it is numerically equal to the maximum induction expressed in gausses minus the magnetising force in oersteds (b minus h). stacking factor: the proportion of steel that would be found when lamination sheets are stacked on top of each other as compared to a solid steel section for the same volume. it varies between 95% to 97% for crgo steel coils, however it reduces with fabrication if there are "burrs" developed. this is turn would increase the overall core loss of the electrical equipment. the balance percentage of stacking factor (3 to 5 %) is air! burrs: the residual steel on the edge of steel sheet where shearing or punching during fabrication has taken place, thereby increasing the thickness on the edge and reducing the stacking factor. burrs can be reduced by accurate and precise fabrication and having cutting blades and tools well sharpened at all times. they can also be reduced by deburring and stress relief annealing. (c) properties of grains, domains and understanding of hyster

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Whois Information

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Domain Name: UCOZ.COM
Registry Domain ID: 195852734_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.nic.ru
Registrar URL: http://www.nic.ru
Updated Date: 2015-12-14T15:54:12Z
Creation Date: 2005-08-12T23:34:44Z
Registrar Registration Expiration Date: 2024-08-12T21:00:00Z
Registrar: Regional Network Information Center, JSC dba RU-CENTER
Registrar IANA ID: 463
Registrar Abuse Contact Email: [email protected]
Registrar Abuse Contact Phone: +7.4959944601
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Registry Registrant ID:
Registrant Name: Compubyte Limited
Registrant Organization: Compubyte Limited
Registrant Street: Trident Chambers, P.O. Box 146
Registrant City: Road Town
Registrant Postal Code: VG1110
Registrant Country: VG
Registrant Phone: +44.2033180739
Registrant Phone Ext:
Registrant Email: [email protected]
Registry Admin ID:
Admin Name: Compubyte Limited
Admin Organization: Compubyte Limited
Admin Street: Trident Chambers, P.O. Box 146
Admin City: Road Town
Admin Postal Code: VG1110
Admin Country: VG
Admin Phone: +44.2033180739
Admin Phone Ext:
Admin Email: [email protected]
Registry Tech ID:
Tech Name: Compubyte Limited
Tech Organization: Compubyte Limited
Tech Street: Trident Chambers, P.O. Box 146
Tech City: Road Town
Tech Postal Code: VG1110
Tech Country: VG
Tech Phone: +44.2033180739
Tech Phone Ext:
Tech Email: [email protected]
Name Server: ns1.ucoz.net
Name Server: ns2.ucoz.net
Name Server: ns3.ucoz.net
DNSSEC: unsigned
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For more information on Whois status codes, please visit: https://icann.org/epp
>>> Last update of WHOIS database: 2017.07.06T10:21:58Z <<<

  REGISTRAR REGIONAL NETWORK INFORMATION CENTER, JSC DBA RU-CENTER

  REFERRER http://nic.ru

SERVERS

  SERVER com.whois-servers.net

  ARGS domain =ucoz.com

  PORT 43

  SERVER whois.nic.ru

  ARGS ucoz.com

  PORT 43

  TYPE domain

DOMAIN

  NAME ucoz.com

NSERVER

  NS1.UCOZ.NET 195.216.243.104

  NS2.UCOZ.NET 213.174.157.200

  NS3.UCOZ.NET 190.115.19.142

STATUS
clientTransferProhibited https://icann.org/epp#clientTransferProhibited

  CHANGED 2015-12-14

  CREATED 2005-08-12

  EXPIRES 2024-08-12

  REGISTERED yes

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