HAYNES® 242® alloy for Plastics Production & Processing Tech Brief

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For Plastics Production & Processing Equipment

High strength and resistance to corrosion are critical considerations in the selection of materials for plastics production and processing equipment, and both are hallmark features of HAYNES® 242® alloy from Haynes International, Inc. With twice the strength of traditional HASTELLOY® alloys up to 1200°F (650°C), and excellent resistance to fluoride and chloride process environments, 242® alloy offers performance unmatched by any other material. Field-tested applications to date include extrusion screws and cylinders, film dies, screen housing, injection molding dies, and sensor components, all used in the production and processing of polymers such as PVDF and PTFE.

242® alloy is an age-hardenable material which is usually supplied in the annealed condition. For component applications where even higher strength and additional resistance to wear are desired, 242® alloy can be supplied in a cold-worked condition. When aged, this will afford room temperature hardness levels of Rockwell C50 or more, and yield strength approaching 200 Ksi (1380 MPa). Component machining has been successfully performed in the annealed, annealed + aged, and as-cold-worked conditions.

Aqueous Corrosion Resistance
Alloy 48% HF 175°F (79°C) 10% HCl 219°F (104°C)
– mpy mmpy mpy mmpy
242® 32 0.8 22 0.6
C-22® 27 0.7 400 10.2
C-276 37 0.9 288 7.3
600 68 1.7 >4000 >100
625 >1500 >38 642 16.3

MPY = mils per year MMPY = mm per year

Nominal Composition

Nickel Balance
Molybdenum 25
Chromium 8
Iron 2 max.
Cobalt 2.5 max.
Manganese 0.8 max.
Silicon 0.8 max.
Aluminum 0.5 max.
Carbon 0.03 max.
Boron 0.006 max.
Copper 0.5 max.

Typical Tensile Properties, Plate

Test Temperature 0.2%Yield Strength Ultimate Tensile Strength Elongation
°F °C ksi MPa ksi MPa %
RT RT 113 780 184 1270 38
800 425 80 555 156 1075 44
1000 540 70 480 145 1000 47
1200 650 76 525 137 945 38
1400 760 42 290 106 730 66
1600 870 40 275 69 475 56
1800 980 28 190 41 285 65

Typical Rupture Strength, Plate

Test Temperature Typical Rupture Properties:
10 h 100 h 1,000 h
°F °C ksi MPa ksi MPa ksi MPa
1000 540 160 1105 140 965 120 825
1100 595 130 895 110 760 93 640
1200 650 105 725 90 620 75 515
1300 705 86 595 69 475 35 240
1400 760 59 425 29 200 17 115

Typical Mean Coefficient of Expansion

°F °C µin/in µm/m
RT RT – –
800 400 6.7 11.9
1000 550 6.8 12.3
1100 600 6.8 12.3
1200 650 6.9 12.4
1300 700 7.2 130

Typical Room Temperature Physical Properties

Physical Property British Units Metric Units
Density
0.327 lb/in3
9.06 g/cm3
Electrical Resistivity 48.0 µohm-in 122.0 µohm-cm
Modulus of Elasticity
33.2 x 106 psi
 229 GPA
Thermal Conductivity
75.7 Btu-in/ft2-h-°F
 11.3 W/m-°C
Specific Heat 0.092 Btu/lb-°F 386 J/Kg-°C

Environmental Resistance

Oxidation Resistance – Excellent to 1400°F (760°C)

Gaseous Fluorine & HF – Excellent to 1650°F (900°C)

Molten Chloride/Fluoride Salts – Excellent to 1650°F (900°C)

Chloride Stress Cracking Resistance – Excellent

Chlorination – Excellent in Reducing Environments

Hydrogen Embrittlement Resistance – Fair to Good