Fabricated Jigs and Fixtures
  -----------------------------------
Cast Jigs and Fixtures
  -----------------------------------
Furnace Spares
  -----------------------------------
Wire Mesh, Expanded Mesh and Mesh Belts
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Investment Castings
  -----------------------------------
Heat resistant hardware
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Mild Steel and Stainless Steel Casting Division
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Scrap Recycling Program
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Chemical Composition
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Chemical Compositions of Alloys

COMMON HEAT RESISTANT CAST ALLOYS
NATIONAL & INTERNATIONAL SPECIFICATION

CASTING SPECIFICATION
NEAREST WROUGHT ALLOY
NISHA
INDIAN
AMERICAN
GERMAN
AMERICAN
GERMAN
GRADE
IS 4522
ASTM A-297
WERKSTOFF
AISI
WERKSTOFF

NHC
2
HC
1.4776
446
-
NHD
4
HD
1.4823
327
1.4821
NHF
5
HF
1.4825
302
1.4300
NHH
7
HH
1.4837
309
-
NHK
9
HK
1.4848
310/314
1.4841/1.4845
NHN
11
HN
-
311
-
NHT
12
HT
-
330
-
NHU
13
HU
1.4865
-
1.4864
NHX
14
HX
-
-
2.4867

TYPICAL CONTENT OF SOME OF THE WROUGHT ALLOYS
ALLOY GRADE
NI%
Cr%
C% max
OTHER IMPORTANT ADDITIONS
AISI 304
8-12
18-20
0.08
AISI 309
12-15
22-24
0.045
AISI 310
19-22
24-26
0.25
AISI 310S
19-22
24-26
0.08
AISI 314
19-22
23-26
0.25
AISI 316
10-14
16-18
0.08
AISI 321
9-12
17-19
0.08
Ti=0.4 max
AISI 330
34-37
17-20
0.08
INCOLOY 800
30-35
19-23
0.10
Ti=0.15 min
INCOLOY DS
35-40
17-19
0.10
Ti=0.20
INCONEL 600
74-78
15-17
0.15
Cu=0.15

TYPICAL PROPERTIES & USE OF SOME OF THE HEAT RESISTANT CAST ALLOYS
NISHA GRADE
NI% Cr% C% FAVOURABLE WORKING RANGE IN AIR °C RESISTANCE TO CARBURISING ATMOSPHERE WORKING CONDITION
NHD
5
28
0.5
900-1100
BAD
Furnace parts with moderate mechanical load at temperature range above 900°C
NHF
10
21
0.4
upto 900
AVERAGE
Furnace parts with high mechanical load at temperature range above 900°C
NHH
12
26
0.4
900-1050
AVERAGE
Furnace parts with high mechanical load at temperature range above 900°C
NHK
20
26
0.5
900-1100
AVERAGE
Furnace parts with high mechanical load at temperature normally above 900°C
NHT
35
15
0.5
upto 1050
GOOD
Furnace parts with higher mechanical load and toughness at changing temperatures upto 1050°C
NHU
38
18
0.5
upto 1050
GOOD
Furnace parts with higher mechanical load and toughness at changing temperatures upto 1050°C
NHX
66
17
0.5
upto 1150
VERY GOOD
Furnace parts with higher temperature load upto 1150°C, Outstanding resistance to thermal fatigue, cracking and scale resistance.
  • Inconel 600, Incoloy DS & Incoloy 800 mentioned in this are trade marks of The International Nickel Co. Inc.
  • Informations produced in this lealiet are correct to the best of our knowledge. Application table is only intended as a general guide.
  • Detailed selection would be dependent on actual service conditions such as working temprature, loading stress, thermal cycling, furnace atmosphere and other conditions.