Thursday, August 30, 2007

Krom www.tool-tool.com

Bewise Inc. www.tool-tool.com Reference source from the internet.
24 VanadiumKromMangan


Cr

Mo
Krom i periodesystemet
Generelle eigenskapar
Namn, kjemisk symbol,
atomnummer
Krom, Cr, 24
Kjemisk serie Transisjonsmetall
Gruppe, periode, blokk 6, 4, d
Tettleik, hardleik 7140 kg/m3, 8,5 (ikkje SI)
Utsjånad Sølvaktig
Krom
Atomeigenskapar
Atommasse 51,9961 u (ikkje SI)
Atomradius (berekna) 140 (166) pm
Kovalent radius 127 pm
Ioneradius 62 pm (ladning: +3)
van der Waals radius (?) pm
Elektronkonfigurasjon [Ar]3d54s1
Elektron per energinivå 2, 8, 13, 1
Oksidasjonstrinn (oksid) +2, +3, +6 (sterk syre)
Krystallstruktur Kubisk romsentrert
Fysiske eigenskapar
Tilstandsform Fast stoff
Smeltepunkt 2130 K (1857°C)
Kokepunkt 2945 K (2672°C)
Molart volum 7,23 cm3/mol
Fordampingsvarme 344,3 kJ/mol
Smeltevarme 16,9 kJ/mol
Damptrykk 990 Pa ved 2130 K
Ljodfart 5940 m/s ved 20°C
Diverse eigenskapar
Elektronegativitet 1,66 (Paulings skala)
Spesifikk varmekapasitet 450 J/(kg·K)
Elektrisk konduktivitet 7,74 MS/m
Termisk konduktivitet 116 W/(m·K)
Ioniseringspotensial 659 kJ/mol
1598 kJ/mol
2993 kJ/mol
4740 kJ/mol
6690 kJ/mol
8744 kJ/mol
15550 kJ/mol
Mest stabile isotopar
Iso-
top
Naturleg
førekomst
Halverings-
tid
(ikkje SI)
NM NE MeV
(ikkje SI)
NP
50Cr (kunstig) >1,8·1017 år ε (?) 50Ti
51Cr (kunstig) 27,7025 d ε 0,753 51V
52Cr 83,789% (stabilt)
53Cr 9,501% (stabilt)
54Cr 2,365% (stabilt)
SI-einingar og STP er brukt unntatt der det er avmerka
Krom er eit metallisk grunnstoff med kjemisk symbol Cr og atomnummer 24. Det er eit transisjonsmetall


BW Bewise Inc. Willy Chen willy@tool-tool.com bw@tool-tool.com www.tool-tool.com skype:willy_chen_bw mobile:0937-618-190 Head &Administration Office No.13,Shiang Shang 2nd St., West Chiu Taichung,Taiwan 40356 TEL:+886 4 24710048 / FAX:+886 4 2471 4839 N.Branch 5F,No.460,Fu Shin North Rd.,Taipei,Taiwan S.Branch No.24,Sec.1,Chia Pu East Rd.,Taipao City,Chiayi Hsien,Taiwan

Welcome to BW tool world! We are an experienced tool maker specialized in cutting tools. We focus on what you need and endeavor to research the best cutter to satisfy users demand. Our customers involve wide range of industries, like mold & die, aerospace, electronic, machinery, etc. We are professional expert in cutting field. We would like to solve every problem from you. Please feel free to contact us, its our pleasure to serve for you. BW product including: cutting toolaerospace tool .HSS Cutting toolCarbide end millsCarbide cutting toolNAS Cutting toolCarbide end millAerospace cutting toolФрезерыCarbide drillHigh speed steelMilling cutterCVDD(Chemical Vapor Deposition Diamond )PCBN (Polycrystalline Cubic Boron Nitride) Core drillTapered end millsCVD Diamond Tools Inserts’PCD Edge-Beveling Cutter(Golden Finger’PCD V-Cutter’PCD Wood tools’PCD Cutting tools’PCD Circular Saw Blade’PVDD End Mills’diamond tool Single Crystal Diamond Metric end millsMiniature end millsСпециальные режущие инструменты Пустотелое сверло Pilot reamerFraisesFresas con mango PCD (Polycrystalline diamond) FreseElectronics cutterStep drillMetal cutting sawDouble margin drillGun barrelAngle milling cutterCarbide burrsCarbide tipped cutterChamfering toolIC card engraving cutterSide cutterNAS toolDIN toolSpecial toolMetal slitting sawsShell end millsSide and face milling cuttersSide chip clearance sawsLong end millsStub roughing end millsDovetail milling cuttersCarbide slot drillsCarbide torus cuttersAngel carbide end millsCarbide torus cuttersCarbide ball-nosed slot drillsMould cutterTool manufacturer.

Bewise Inc. www.tool-tool.com

BW специализируется в научных исследованиях и разработках, и снабжаем самым высокотехнологичным карбидовым материалом для поставки режущих / фрезеровочных инструментов для почвы, воздушного пространства и электронной индустрии. В нашу основную продукцию входит твердый карбид / быстрорежущая сталь, а также двигатели, микроэлектрические дрели, IC картонорезальные машины, фрезы для гравирования, режущие пилы, фрезеры-расширители, фрезеры-расширители с резцом, дрели, резаки форм для шлицевого вала / звездочки роликовой цепи, и специальные нано инструменты. Пожалуйста, посетите сайт www.tool-tool.com для получения большей информации.

BW is specialized in R&D and sourcing the most advanced carbide material with high-tech coating to supply cutting / milling tool for mould & die, aero space and electronic industry. Our main products include solid carbide / HSS end mills, micro electronic drill, IC card cutter, engraving cutter, shell end mills, cutting saw, reamer, thread reamer, leading drill, involute gear cutter for spur wheel, rack and worm milling cutter, thread milling cutter, form cutters for spline shaft/roller chain sprocket, and special tool, with nano grade. Please visit our web www.tool-tool.com for more info.

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