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PEARLITIC CHROME MOLY STEEL
Ari Azhari (0606074590)
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Content
Definisi
Faktor-faktor an mem en aruhi
Perbandingan dengan Mn steel dan Ni-Hard
Aplikasi
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Definisi
• Merupakan salah satu wear resistant steel yang mempunyaikandungan 2.1 – 2.4 % Cr dan 0.3 – 0.5 % Mo
Combination hardness and toughness
high abrasion-resistance
high tensile strength, good weldability, and durability
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Cont’d
Mempunyai 3 jenis grade berdasarkan kandungancarbonnya, yaitu:
Grade low carbon (0.55 – 0.65 % C)
Gra e me um car on 0.65 – 0.75 % CGrade high carbon (0.75 – 0.85 % C)
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Cont’d
Komposisi kimia pada pearlitic chrome moly steel berdasarkan perbedaankandungan carbonnya
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Cont’d
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Cont’d
Low Carbon
• Lamellae Ferrit
MediumCarbon
High Carbon
• Lamellae
an ironcarbide• 275 – 325 HB
• Lamellae Ironcarbide• 321 – 360 HB
Hypereutectoicarbide• 350 – 400 HB
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Mikrostruktur pearlitic chrome-moly steel
Low carbon
Highcarbon
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Faktor-faktor yang mempengaruhi
Chromium
• Meningkatkan kemampu-kerasan.
• Peningkatan ketahanan terhadap pengaruh
a ras .• Unsur pembentuk karbida (elemen pengeras).
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Cont’d
Molybdenum
• Meningkatkan kemampukerasan baja.
• Menurunkan kerentanan terhada tem er
embrittlement (400-550 0C)• Meningkatkan kekuatan tarik pada temperatur
tinggi dan kekuatan creep.
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Cont’d
Pengaruh Mo terhadapkekuatan tarik
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Cont’d
Carbon
• Larut dalam ferrite
• Pembentukan sementit dan karbida lainn a
perlit, bainit.• % C dan distribusinya mempengaruhi sifat baja.
• Kekuatan dan kekerasan meningkat dengan
naiknya % C.
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Cont’d
Pengaruh % carbonterhadap kekerasan
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Heat treatment pada Pearlitic Chrome Moly Steel
• Tujuannya untuk menghasilkan sifat mekanik (kekuatan tarik dan
luluh, ketangguhan dan ketahanan abrasi) yang diinginkan• Khusunya untuk meningkatkan kekuatan dan ketahanan wear
(abrasi)
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Cont’d
• Pelarutan (solutioning)
Suatu metode yang diterapkan pada baja dengan kondisitemperatur austenitization (850° to 900° C)
Pemanasan dilakukan dalam furnace dengan electricaln uc on sys em a au gas urner.
Kemudian diikuti dengan pendinginan cepat denganmedia oli, uap air, air bertekanan, atau dengan water jet
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Perbandingan dengan Mn steel dan Ni-Hard
Dari segi harga pembuatan antara Mn steel, Ni-Harddengan Pearlitic Chrome Moly Steel (PCMS).
dibandingkan dengan Mn Steel. Akan tetapi, dengan Ni-Hard mempunyai biaya pembuatan yang lebih rendah.
Adapun faktor-faktor yang mempengaruhi adalahkandungan unsur-unsur didalamnya seperti Cr, Ni, Mo, dll
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Aplikasi
Pearlitic Chrome Moly Steels banyak digunakan dalam industri
automobile, engineering, railways, defense, electrical equipment,mining, seperti breaker bars yang digunakan dalam cement mills dan
ball mill liners
Adapun yang digunakan dalam industri tersebut adalah sifat dari
pearlitic chrome moly steels yang mempunyai kekuatan yang tinggidan ketahanan abrasi yang baik
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Cont’d
aplikasi
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Referensi
http://www.freepatentsonline.com/4714500.html
http://www.titussteel.com/wear_steel.htm
www.ent.ohiou.edu/~tscott/IT111/Lab%204%20W07(Pub).doc
www.arc vesmse.org vo 2 _4 2 45.p
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