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HAYNES® Alloys

Codes for High-temperature Alloys

Alloy ASME MMPDS 
Section I Section III Section IV Section VIII Section XII B16.5 B16.34 B31.1 B31.3
Class 1 Class 2 Class 3 Classes TC and SC HF-300.2 Div. 1 Div. 2
HAYNES® 25 alloy
R30605
 
-  - 6.4.1 
HAYNES® 188 alloy
R30188 
- 6.4.2 
HAYNES® 230® alloy
N06230
1650°F (899°C)1
Code Case 2063
1000°F (538°C)
Code Case 2756
1000°F (538°C) to
1250°F (677°C)
Water Wetted
Cold Case 2665
1300°F (704°C)
Molten Salt
- - - - 500°F (132°C)1 1800°F (982°C)1
Code Case 2671
External Pressure
1800°F (982°C)
Code Case 2775
1650°F (899°C)16
- 650°F (343°C)1 1500°F (816°C)18 1500°F (816°C)11

1500ºF (816ºC)
Code Case 6 Valves, Temp Pressure Rating Increase, Forgings
- 1650°F (900°C)1 6.3.9 
HAYNES® 242® alloy
N10242
- - - - - - 1000°F (538°C)1 - - - - - -
HAYNES® 282® alloy
N07208
- - - - - - - - - - - - 6.3.11 
HAYNES® 556® alloy
R50556
- - - - - - 1650°F (899°C)6 800°F (427°C)16 650°F (343°C)5 1500°F (816°C)17 1500°F (816°C)17 1200°F (649°C)3 -
HAYNES® 617 alloy
N06617
1650°F (899°C)7 - - - - - 1800°F (982°C)7
Code Case 2776
1650°F (899°C)16
- - - - 1200°F (649°C)7 -
HAYNES® 625 alloy
N06625
Grade 1
1100°F (593°C)1
Cold Case 2632
1200°F (650°C)12
Grade 2
1100°F (593°C)9
Cold Case 1935
1000°F (538°C)9
Grade 1
800°F (427°C)9
Grade 1
800°F (427°C)9
Grade 1
800°F (427°C)4
- - Grade 1
1200°F (649°C)1
Grade 2
1600°F (871°C)9
1200°F (649°C)16
Grade 1
800°F (427°C)
(Bolting)
Code Case 2468
800°F (427°C)7
Grade 1
650°F (343°C)1
Grade 2
650°F (343°C)10
1200°F (649°C)18 1200°F (649°C)11 1200°F (649°C)1 1200°F (649°C)7 6.3.3 
HAYNES® 625SQ® alloy
N06626
- - - - - Code Case 2276
800°F (427°C)13
- - - - - -
HAYNES® 718 alloy
N07718 
- - 6.3.5 
HAYNES® HR-120® alloy
N08120
- - - - - - 1650°F (899°C)1
Code Case 2672
1650°F (899°C)
1800°F (982°C)
- - - - - - 6.3.10 
HAYNES® HR-160® alloy
N12160
- - - - - - 1800°F (982°C)1
- - - - - -
HAYNES® R-41 alloy
N07041
- 6.3.7 
HAYNES® Waspaloy alloy
N07001
 
- - 6.3.8 
HASTELLOY® X alloy
N06002
- 800°F (427°C)5 800°F (427°C)5
800°F (427°C)5
 800ºF (427ºC)1 - 1650°F (899°C)2 900ºF (482ºC)15
1650°F (899°C)5
800°F (427°C)16
650°F (343°C)2
1500°F (816°C)17 1500°F (816°C)14 - 1500°F (816°C)8 6.3.1 
HAYNES® X-750 alloy
N07750
- - 6.3.6 
1Approved material forms: Plate, Sheet, Bar, Forgings, fittings, welded pipe/tube, seamless pipe/tube
2Approved material forms: Plate, Sheet, Bar, fittings, welded pipe/tube, seamless pipe/tube, Bolting
3Approved material forms: Plate, Sheet, Bar, fittings, welded pipe/tube, seamless pipe/tube
4Approved material forms: Plate, Sheet, Bar, Forgings, welded pipe/tube, seamless pipe/tube
5Approved material forms: Welded pipe/tube, seamless pipe/tube
6Approved material forms: Plate, Sheet, Bar, welded pipe/tube, seamless pipe/tube, Bolting
7Approved material forms: Plate, Sheet, Bar, Forgings, seamless pipe/tube
8Approved material forms: Plate, Sheet, fittings, welded pipe/tube, seamless pipe/tube
9Approved material forms: Plate, Sheet, Bar, seamless pipe/tube
10Approved material forms: Plate, Sheet, Bar, seamless pipe/tube, Bolting
11Approved material forms: Plate, Bar, Forgings, seamless pipe/tube
12Approved material forms: Plate, Sheet, welded pipe/tube
13Approved material forms: Sheet, fittings, welded pipe/tube
14Approved material forms: Plate, Bar, seamless pipe/tube
15Approved material forms: Plate, Sheet, and Rod
16Approved material forms: Bolting only
17Approved material forms: Plate, Bar
18Approved material forms: Plate, Forgings
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