4. 1. White Cast Iron
2. Grey Cast Iron (FC)
3. Mallable Cast Iron
4. Ductile Cast Iron (FCD)
5. Austempered Ductile Iron (ADI)
Matrix: Ferritic, pearlitic, austenitic,
martensitic, bainitic (austempered).
Tipe Besi Tuang
5. Komposisi Besi Tuang
Utama : Fe (besi)
Paduan : C (karbon) = 2.75 – 4.00%
Si (silikon) = 0.75 – 3.00%
Mn (mangan) = 0.25 – 1.50%
P (posfor) = 0.02 – 0.75%
S (sulfur) = 0.02 – 0.2%
Carbon Equivelent :
CE (%) = C (%) + 0,33 (Si + P) %
Komposisi Besi Tuang
9. Klasifikasi Besi Tuang Kelabu
Class Symbol UTS
(kg/mm2)
Hardness
(HB)
Class 1 FC 10 10 min 201 max
Class 2 FC 15 15 min 212 max
Class 3 FC 20 20 min 223 max
Class 4 FC 25 25 min 241 max
Class 5 FC 30 30 min 262 max
Class 6 FC 35 35 min 277 max
14. A = alloy, basic open hearth
B = carbon, acid Bessemer
C = carbon, basic open hearth
D = carbon, acid open hearth
E = electric furnace
Contoh: AISI C1050 adalah
baja karbon, basic-open hearth
steel dg 0.50 % karbon
Huruf lain adalah H-
Hardenability Contoh; 4340H
Klasifikasi Baja Paduan
20. Properties of Stainless Steel
Alloy Group Magnetic
Response1
Work Hardening
Rate
Corrosion
Resistance2
Hardenable
Austenitic Generally No Very High High By Cold Work
Duplex Yes Medium Very High No
Ferritic Yes Medium Medium No
Martensitic Yes Medium Medium Quench &
Temper
Precipitation
Hardening
Yes Medium Medium Age Harden
Alloy Group Ductility
High
Temperature
Resistance
Low Temperature
Resistance3 Weldability
Austenitic Very High Very High Very High Very High
Duplex Medium Low Medium High
Ferritic Medium High Low Low
Martensitic Low Low Low Low
Precipitation
Hardening
Medium Low Low High
41. Klasifikasi Paduan Magnesium
AZ91C-T6
2 huruf
Elemen paduan
utama
A = aluminium
Z = zinc
2 angka
Jumlah paduan
utama
9 = 9% Al
1 = 1% Zn
Klasifikasi
Temper
-T6 = solution
treatmen dan
pemanasan
aging
1 huruf
Paduan lain
C = Paduan
ketiga
42. Kode-kode penandaan ASTM
A - Aluminium
E - Rare earths
H - Thorium
K - Zirconium
M - Manganese
Q - Silver
T - Tin
Z - Zinc
F - As fabricated
O - Annealed
H10 and H11 - slightly strain hard
H23, H24, H26 - strain hardened and
partially annealed
T4 - artificially aged
T6 - Solution treat, aged
T8 - Solution treat, cold work, aged
43. Contoh Magnesium Alloys
AZ91C-T6: 9Al-0.7Zn-0.13Mn
Kekuatan menengah (91 MPa yield, 275 MPa tensile),
keuletan baik
K1A: 1Zr
Kapasitas redam tinggi
QH21A: 2.5Ag-1Th-0.7Zr
Komponen pesawat udara untuk hingga 250˚C
207 MPa yield, 275 MPa tensile
44. Contoh Magnesium Alloys
AZ91B-F
Paduan untuk proses die casting
AM60A-F
Roda automotive, ketangguhan baik, kekuatan baik.
AS41A-F
Ketahanan creep baik hingga 175˚C
45. Contoh Magnesium Alloys
AZ31B-F
Batang ekstrusi dan dibentuk untuk komponen baterai,
sifat mekanis menengah jika digunakan untuk struktur.
HK31A-H24 Sheet and plate ,
yield stress 205 MPa dan UTS 260 MPa, mampu las amat
baik.
