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Heat Resistant Castings-Iron Base Alloys
Castings are classified as heat resistant if they are capable of sustained operation while exposed, either continuously or intermittently to operating temperatures that result in metal temperature in excess of 650�C (1200�F). Alloys used in castings for such applications fall into four broad categories. A number of proprietary alloys viz. AiResist, Haynes, Inconel, Rene, Udimet, Hastelloy, MAR-M, RA-330, Nimonic and many other alloys developed by companies viz. Inco Alloys, Rolled Alloys, Carpenter Alloys, Krupp VDM, also fall within the four categories mentioned below: The discussion in this technical paper is restricted to iron-base alloys.
1. Iron-base heat resistant alloys
· Straight Chromium alloys-HA, HC, HD
· Iron-Chromium-Nickel (Fe-Cr-Ni) alloys-HE, HF, HH-I, HH-II, HP-50WZ, HK, HK-30, HK40, HK-50, HL
· Iron-Nickel-Chromium (Fe-Ni-Cr) alloys-HN, HP, HT, HU, HW, HX
2. Nickel-base heat resistant alloys
3. Cobalt-base heat resistant alloys
4. Super alloys
· Iron base super alloys
· Nickel base super alloys
· Cobalt base super alloys
Table 1 shows the representative ASTM/ ACI compositions of iron-base heat resistant casting alloys. Other alloy standards DIN (Germany), BS (U.K.), ISO have their corresponding counterparts of heat resisting alloys designated to their respective standards but have inherently similar elemental chemical composition ranges. ASTM/ ACI standards are referred here, as they are the most popular and widely accepted materials & alloy standards across the world. Acme Alloys � manufactures its own proprietary alloys and proprietary alloys that are developed by companies, to meet a particular industry application or for superior performance in specific environments compared to generally available standard alloys.
Table 1: Composition of heat resisting iron base alloys
|
ACI Designation |
ASTM Specifications |
Carbon (C) % |
Chromium (Cr) |
%Nickel (Ni) % |
Silicon (Si)% |
|
Straight-Cr |
|
|
|
|
|
|
Alloys |
|
|
|
|
|
|
HA |
A 217 |
0.20 |
8.0-10.0 |
- |
1.00 |
|
HC |
A 297, A 608 |
0.50 |
26.0-30.0 |
4.0 |
2.00 |
|
HD |
A 297, A 608 |
0.50 |
26.0-30.0 |
4.0-7.0 |
2.00 |
|
Fe-Cr-Ni Alloys |
|
|
|
|
|
|
HE |
A 297, A 608 |
0.20-0.50 |
26.0-30.0 |
8.0-11.0 |
2.00 |
|
HF |
A 297, A 608 |
0.20-0.40 |
19.0-23.0 |
9.0-12.0 |
2.00 |
|
HH |
A 297, A 608, A 447 |
0.20-0.50 |
24.0-28.0 |
11.0-14.0 |
2.00 |
|
HI |
A 297, A 567, A 608 |
0.20-0.50 |
26.0-30.0 |
14.0-18.0 |
2.00 |
|
HK |
A 297, A 351, A 567, |
0.20-0.60 |
24.0-38.0 |
18.0-22.0 |
2.00 |
|
|
A 608 |
|
|
|
|
|
HK-30 |
A 351 |
0.25-0.35 |
23.0-27.0 |
19.0-22.0 |
1.75 |
|
HK-40 |
A 351 |
0.35-0.45 |
23.0-27.0 |
19.0-22.0 |
1.75 |
|
HL |
A 297, A 608 |
0.20-0.60 |
28.0-32.0 |
18.0-22.0 |
2.00 |
|
Fe-Ni-Cr Alloys |
|
|
|
|
|
|
HN |
A 297, A 608 |
0.20-0.50 |
19.0-23.0 |
23.0-27.0 |
2.00 |
|
HP |
A 297 |
0.35-0.75 |
24.0-28.0 |
33.0-37. 0 |
margin: 0 
eng.yaser abas elkelawy quality control manager in united company for foundries ([email protected]) +201000732365 نشرت فى 7 يونيو 2009
بواسطة yasernor
yasser mohamed abass
quality control manager in international company for casting &pipefittings INFIT mobile no./+201000732365 email/[email protected] [email protected] »
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