HASTELLOY® G-35® alloy
Principal Features
A nickel alloy with exceptional resistance to “fertilizer-grade” phosphoric acid
HASTELLOY® G-35® alloy (UNS N06035) was developed to resist “fertilizer-grade” phosphoric acid (P2O5), which is used in the production of fertilizers. Tests in real-world solutions indicate that G-35® alloy is far superior to other metallic materials in this acid. It was also developed to resist localized attack in the presence of chlorides, since this can be a problem beneath deposits in evaporators used to concentrate “fertilizer-grade” phosphoric acid. Furthermore, G-35® alloy is much less susceptible to chloride-induced stress corrosion cracking than the stainless steels and nickel-chromium-iron alloys traditionally used in “fertilizer-grade” phosphoric acid.
As a result of its very high chromium content, G-35® alloy is extremely resistant to other oxidizing acids, such as nitric, and mixtures containing nitric acid. It possesses moderate resistance to reducing acids, as a result of its appreciable molybdenum content, and, unlike other nickel-chromium-molybdenum alloys, it is very resistant to “caustic de-alloying” in hot sodium hydroxide.
HASTELLOY® G-35® alloy is available in the form of plates, sheets, strips, billets, bars, wires, pipes, tubes, and covered electrodes. Applications include P2O5 evaporator tubes.
Nominal Composition
Weight %
Nickel
58 Balance
Cobalt
1 max.
Chromium
33.2
Molybdenum
8.1
Tungsten:
0.6 max.
Iron
2 max.
Manganese
0.5 max.
Aluminum
0.4 max.
Silicon
0.6 max.
Carbon
0.05 max.
Copper
0.3 max.
Weight % | |
Nickel | 58 Balance |
Cobalt | 1 max. |
Chromium | 33.2 |
Molybdenum | 8.1 |
Tungsten: | 0.6 max. |
Iron | 2 max. |
Manganese | 0.5 max. |
Aluminum | 0.4 max. |
Silicon | 0.6 max. |
Carbon | 0.05 max. |
Copper | 0.3 max. |
Resistance to “Fertilizer-grade” Phosphoric Acid
“Fertilizer-grade” phosphoric acid (P2O5), which is made by reacting phosphate rock with sulfuric acid, is one of the most important industrial chemicals, being the primary source of phosphorus for agrichemical fertilizers. As produced, it contains many impurities, and has a P2O5 concentration of only about 30%, because of the large amount of rinse water needed to separate it from the other main reaction product, calcium sulfate. Typical impurities include unreacted sulfuric acid, various metallic ions, fluoride ions, and chloride ions. The fluoride ions tend to form complexes with the metallic ions, and are therefore less of a problem than the chloride ions, which strongly influence electro chemical reactions between “fertilizer-grade” phosphoric acid and metallic materials. Particulate matter (for example, silica particles) can also be present in “fertilizer-grade” acid.The main use of metallic materials is in the concentration process, where the “fertilizer-grade” acid is taken through a series of evaporation steps, involving metallic tubing. Typically, the P2O5 concentration is raised to 54% during this process. The concentration effect upon the corrosivity of the acid is somewhat offset by the fact that the impurity levels drop as the concentration increases.
The following chart, comparing G-35® alloy with competitive materials, is based on tests in three concentrations (36, 48, and 54%) of “fertilizer-grade” phosphoric acid (supplied by a producer in Florida, USA) at 121°C (250°F).
Iso-Corrosion Diagrams
Comparative 0.1 mm/y Line Plots
To compare the performance of HASTELLOY G-35 alloy with that of other materials, it is useful to plot the 0.1 mm/y lines. In the following graphs, the lines for G-35 alloy are compared with those of 625 alloy, 254SMO alloy, and 316L stainless steel, in hydrochloric and sulfuric acids. Note that the lines for G-35 alloy are close to those for 625 alloy. The hydrochloric acid concentration limit of 20% is the azeotrope, above which corrosion tests are less reliable.
Selected Corrosion Data
Hydrobromic Acid
Conc. Wt.% | 50°F | 75°F | 100°F | 125°F | 150°F | 175°F | 200°F | 225°F | Boiling |
10°C | 24°C | 38°C | 52°C | 66°C | 79°C | 93°C | 107°C | ||
2.5 | - | - | - | - | <0.01 | - | <0.01 | - | <0.01 |
5 | - | - | - | - | <0.01 | - | <0.01 | - | <0.01 |
7.5 | - | - | - | - | <0.01 | - | <0.01 | - | 0.02 |
10 | - | - | - | - | <0.01 | <0.01 | 1.12 | - | - |
15 | - | - | - | - | <0.01 | 0.41 | 1.89 | - | - |
20 | - | - | - | <0.01 | 0.44 | 1.12 | - | - | - |
25 | - | - | - | - | - | - | - | - | - |
30 | - | 0.01 | 0.14 | 0.26 | 0.46 | 0.84 | - | - | - |
40 | - | - | 0.10 | 0.17 | 0.31 | 0.48 | - | - | - |
All corrosion rates are in millimeters per year (mm/y); to convert to mils (thousandths of an inch) per year, divide by 0.0254.
Data are from Corrosion Laboratory Job 17-04.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.
Hydrochloric Acid
Conc. Wt.% | 50°F | 75°F | 100°F | 125°F | 150°F | 175°F | 200°F | 225°F | Boiling |
10°C | 24°C | 38°C | 52°C | 66°C | 79°C | 93°C | 107°C | ||
1 | - | - | - | - | - | - | - | - | 0.05 |
1.5 | - | - | - | - | - | - | - | - | - |
2 | - | - | - | - | - | - | <0.01 | - | 0.05 |
2.5 | - | - | - | <0.01 | <0.01 | <0.01 | 17.83 | - | - |
3 | - | - | - | - | <0.01 | <0.01 | - | - | - |
3.5 | - | - | - | - | - | - | - | - | - |
4 | - | - | - | - | - | - | - | - | - |
4.5 | - | - | - | - | - | - | - | - | - |
5 | - | - | <0.01 | - | <0.01 | 1.23 | 17.08 | - | - |
7.5 | - | - | <0.01 | 0.47 | 0.97 | - | - | - | - |
10 | - | <0.01 | 0.17 | 1.49 | - | - | - | - | - |
15 | 0.09 | 0.19 | 0.52 | - | - | - | - | - | - |
20 | 0.08 | 0.15 | 0.42 | - | - | - | - | - | - |
Data are from Corrosion Laboratory Job 44-02.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.
Nitric Acid
Conc. Wt.% | 50°F | 75°F | 100°F | 125°F | 150°F | 175°F | 200°F | 225°F | Boiling |
10°C | 24°C | 38°C | 52°C | 66°C | 79°C | 93°C | 107°C | ||
10 | - | - | - | - | - | - | - | - | - |
20 | - | - | - | - | - | - | - | - | <0.01 |
30 | - | - | - | - | - | - | - | - | - |
40 | - | - | - | - | - | - | - | - | 0.01 |
50 | - | - | - | - | - | - | - | - | 0.03 |
60 | - | - | - | - | - | - | - | - | 0.06 |
65 | - | - | - | - | - | - | - | - | 0.07 |
70 | - | - | - | - | - | - | - | - | 0.10 |
Data are from Corrosion Laboratory Job 6-03.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.
Phosphoric Acid
Conc. Wt.% | 125°F | 150°F | 175°F | 200°F | 225°F | 250°F | 275°F | 300°F | Boiling |
52°C | 66°C | 79°C | 93°C | 107°C | 121°C | 135°C | 149°C | ||
50 | - | - | - | - | - | - | - | - | 0.01 |
60 | - | - | - | - | - | - | - | - | 0.01 |
65 | - | - | - | - | - | - | - | - | 0.17 |
70 | - | - | - | - | 0.01 | 0.09 | - | - | 0.11 |
75 | - | - | - | - | - | 0.12 | - | - | 0.30 |
80 | - | - | - | - | 0.07 | 0.12 | 0.37 | - | 0.42 |
85 | - | - | - | - | 0.07 | 0.14 | 0.31 | 0.71 | 0.99 |
Data are from Corrosion Laboratory Jobs 5-03 and 30-04.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.
Sulfuric Acid
Conc. Wt.% | 75°F | 100°F | 125°F | 150°F | 175°F | 200°F | 225°F | 250°F | 275°F | 300°F | 350°F | Boiling |
24°C | 38°C | 52°C | 66°C | 79°C | 93°C | 107°C | 121°C | 135°C | 149°C | 177°C | ||
1 | - | - | - | - | - | - | - | - | - | - | - | - |
2 | - | - | - | - | - | - | - | - | - | - | - | - |
3 | - | - | - | - | - | - | - | - | - | - | - | - |
4 | - | - | - | - | - | - | - | - | - | - | - | - |
5 | - | - | - | - | - | - | - | - | - | - | - | 0.07 |
10 | - | - | - | - | - | <0.01 | - | - | - | - | - | 0.11 |
20 | - | - | - | - | - | 0.01 | - | - | - | - | - | 0.59 |
30 | - | - | - | - | <0.01 | 2.62 | - | - | - | - | - | - |
40 | - | - | - | <0.01 | <0.01 | 5.41 | - | - | - | - | - | - |
50 | - | - | - | <0.01 | 2.30 | - | - | - | - | - | - | - |
60 | - | - | - | <0.01 | 2.45 | - | - | - | - | - | - | - |
70 | - | <0.01 | 0.32 | 1.62 | - | - | - | - | - | - | - | - |
80 | - | <0.01 | <0.01 | 2.54 | - | - | - | - | - | - | - | - |
90 | - | <0.01 | 0.54 | 3.12 | - | - | - | - | - | - | - | - |
96 | - | <0.01 | 0.50 | 2.84 | - | - | - | - | - | - | - | - |
All corrosion rates are in millimeters per year (mm/y); to convert to mils (thousandths of an inch) per year, divide by 0.0254.
Data are from Corrosion Laboratory Job 45-02.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.
Reagent Grade Solutions, mm/y
Chemical | Conc. wt.% | 100°F | 125°F | 150°F | 175°F | 200°F | Boiling |
38°C | 52°C | 66°C | 79°C | 93°C | |||
Acetic Acid | 99 | - | - | - | - | - | <0.01 |
Chromic Acid | 10 | - | - | 0.15 | - | - | - |
20 | - | - | 0.85 | - | - | - | |
Formic Acid | 88 | - | - | - | - | - | 0.07 |
Hydrobromic Acid | 2.5 | - | - | <0.01 | - | <0.01 | <0.01 |
5 | - | - | <0.01 | - | <0.01 | <0.01 | |
7.5 | - | - | <0.01 | - | <0.01 | 0.02 | |
10 | - | - | <0.01 | <0.01 | 1.12 | - | |
15 | - | - | <0.01 | 0.42 | 1.89 | - | |
20 | - | <0.01 | 0.44 | 1.12 | - | - | |
30 | 0.14 | 0.26 | 0.46 | 0.84 | - | - | |
40 | 0.10 | 0.17 | 0.31 | 0.48 | - | - | |
Hydrochloric Acid | 1 | - | - | - | - | - | 0.05 |
2 | - | - | - | - | <0.01 | 0.05 | |
2.5 | - | <0.01 | <0.01 | <0.01 | 17.83 | - | |
3 | - | - | <0.01 | <0.01 | - | - | |
5 | <0.01 | - | <0.01 | 1.23 | - | - | |
7.5 | <0.01 | 0.47 | 0.97 | - | - | - | |
10 | 0.17 | 1.49 | - | - | - | - | |
15 | 0.52 | - | - | - | - | - | |
20 | 0.42 | - | - | - | - | - | |
Nitric Acid | 20 | - | - | - | - | - | <0.01 |
40 | - | - | - | - | - | 0.01 | |
50 | - | - | - | - | - | 0.03 | |
60 | - | - | - | - | - | 0.06 | |
65 | - | - | - | - | - | 0.07 | |
70 | - | - | - | - | - | 0.10 | |
Phosphoric Acid | 50 | - | - | - | - | - | 0.01 |
60 | - | - | - | - | - | 0.01 | |
70 | - | - | - | - | - | 0.11 | |
75 | - | - | - | - | - | 0.30 | |
80 | - | - | - | - | - | 0.42 | |
Sulfuric Acid | 10 | - | - | - | - | <0.01 | 0.11 |
20 | - | - | - | - | 0.01 | 0.59 | |
30 | - | - | - | <0.01 | 2.62 | - | |
40 | - | - | <0.01 | <0.01 | - | - | |
50 | - | - | <0.01 | 2.30 | - | - | |
60 | - | - | <0.01 | 2.45 | - | - | |
70 | <0.01 | 0.32 | 1.62 | - | - | - | |
80 | <0.01 | <0.01 | 2.54 | - | - | - | |
90 | <0.01 | 0.54 | 3.12 | - | - | - | |
96 | <0.01 | 0.50 | 2.84 | - | - | - |
Resistance to Pitting and Crevice Corrosion
HASTELLOY® G-35® alloy exhibits good resistance to chloride-induced pitting and crevice attack, forms of corrosion to which some of the austenitic stainless steels are particularly prone. To assess the resistance of alloys to pitting and crevice attack, it is customary to measure their Critical Pitting Temperatures and Critical Crevice Temperatures in acidified 6 wt.% ferric chloride, in accordance with the procedures defined in ASTM Standard G 48. These values represent the lowest temperatures at which pitting and crevice attack are encountered in this solution, within 72 hours.
Alloy |
Critical Pitting Temperature
in Acidified 6% FeCl3 |
Critical Crevice Temperature
in Acidified 6% FeCl3 |
||
°F | °C | °F | °C | |
316L | 59 | 15 | 32 | 0 |
254SMO | 140 | 60 | 86 | 30 |
28 | 113 | 45 | 64 | 17.5 |
31 | 163 | 72.5 | 109 | 42.5 |
G-30® | 131 | 55 | 77 | 25 |
G-35® | 203 | 95 | 113 | 45 |
625 | 212 | 100 | 104 | 40 |
Resistance to Stress Corrosion Cracking
One of the chief attributes of the nickel alloys is their resistance to chloride-induced stress corrosion cracking. A common solution for assessing the resistance of materials to this extremely destructive form of attack is boiling 45% magnesium chloride (ASTM Standard G 36), typically with stressed U-bend samples. As is evident from the following results, G-35® alloy is much more resistant to this form of attack than the comparative, austenitic stainless steels. The tests were stopped after 1,008 hours (six weeks).
Alloy | Time to Cracking |
316L | 2 h |
254SMO | 24 h |
28 | 36 h |
31 | 36 h |
G-30® | 168 h |
G-35® | No Cracking in 1,008 h |
625 | No Cracking in 1,008 h |
Corrosion Resistance of Welds
To assess the resistance of welds to corrosion, Haynes International has chosen to test all-weld-metal samples, taken from the quadrants of cruciform assemblies, created using multiple gas metal arc (MIG) weld passes. Interestingly, the resistance of all-weld-metal samples of G-35 alloy to key, inorganic acids is close to that of the wrought, base metal, and even exceeds it in concentrated sulfuric acid.
Chemical | Concentration | Temperature | Corrosion Rate | ||||
wt.% | °F | °C | Weld Metal | Wrought Base Metal | |||
mpy | mm/y | mpy | mm/y | ||||
H2SO4 |
30 | 150 | 66 | <0.4 | <0.01 | 0.4 | 0.01 |
H2SO4 |
50 | 150 | 66 | <0.4 | <0.01 | <0.4 | <0.01 |
H2SO4 |
70 | 150 | 66 | 56.3 | 1.43 | 63.8 | 1.62 |
H2SO4 |
90 | 150 | 66 | 66.5 | 1.69 | 122.8 | 3.12 |
HCl | 5 | 100 | 38 | <0.4 | <0.01 | <0.4 | <0.01 |
HCl | 10 | 100 | 38 | 9.4 | 0.24 | 6.7 | 0.17 |
HCl | 15 | 100 | 38 | 22.0 | 0.56 | 20.5 | 0.52 |
HCl | 20 | 100 | 38 | 17.7 | 0.45 | 16.5 | 0.42 |
HNO3 |
70 | Boiling | 4.7 | 0.12 | 3.9 | 0.10 |
Physical Properties
Physical Property | British Units | Metric Units | ||
Density | RT |
0.297 lb/in3 |
RT |
8.22 g/cm3 |
Electrical Resistivity | RT | 46.5 μohm.in | RT | 1.18 μohm.m |
200°F | 46.8 μohm.in | 100°C | 1.19 μohm.m | |
400°F | 47.4 μohm.in | 200°C | 1.20 μohm.m | |
600°F | 47.7 μohm.in | 300°C | 1.21 μohm.m | |
800°F | 48.2 μohm.in | 400°C | 1.22 μohm.m | |
1000°F | 49.0 μohm.in | 500°C | 1.24 μohm.m | |
1200°F | 49.4 μohm.in | 600°C | 1.25 μohm.m | |
Thermal Conductivity | RT |
70 Btu.in/h.ft2.°F |
RT | 10 W/m.°C |
200°F |
82 Btu.in/h.ft2.°F |
100°C | 12 W/m.°C | |
400°F |
98 Btu.in/h.ft2.°F |
200°C | 14 W/m.°C | |
600°F |
113 Btu.in/h.ft2.°F |
300°C | 16 W/m.°C | |
800°F |
127 Btu.in/h.ft2.°F |
400°C | 18 W/m.°C | |
1000°F |
143 Btu.in/h.ft2.°F |
500°C | 19 W/m.°C | |
- | - | 600°C | 23 W/m.°C | |
Mean Coefficient of Thermal Expansion | 77-200°F | 6.8 μin/in.°F | 21-100°C | 12.3 μm/m.°C |
77-400°F | 7.0 μin/in.°F | 21-200°C | 12.6 μm/m.°C | |
77-600°F | 7.4 μin/in.°F | 21-300°C | 13.2 μm/m.°C | |
77-800°F | 7.5 μin/in.°F | 21-400°C | 13.4 μm/m.°C | |
77-1000°F | 7.7 μin/in.°F | 21-500°C | 13.6 μm/m.°C | |
- | - | 21-600°C | 14.1 μm/m.°C | |
Thermal Diffusivity | RT |
0.11 ft2/h |
RT |
0.028 cm2/s |
200°F |
0.12 ft2/h |
100°C |
0.031 cm2/s |
|
400°F |
0.13 ft2/h |
200°C |
0.034 cm2/s |
|
600°F |
0.15 ft2/h |
300°C |
0.038 cm2/s |
|
800°F |
0.17 ft2/h |
400°C |
0.042 cm2/s |
|
1000°F |
0.18 ft2/h |
500°C |
0.045 cm2/s |
|
- | - | 600°C |
0.048 cm2/s |
|
Specific Heat | RT | 0.11 Btu/lb.°F | RT | 450 J/kg.°C |
200°F | 0.11 Btu/lb.°F | 100°C | 470 J/kg.°C | |
400°F | 0.12 Btu/lb.°F | 200°C | 490 J/kg.°C | |
600°F | 0.12 Btu/lb.°F | 300°C | 510 J/kg.°C | |
800°F | 0.13 Btu/lb.°F | 400°C | 530 J/kg.°C | |
1000°F | 0.13 Btu/lb.°F | 500°C | 530 J/kg.°C | |
- | - | 600°C | 600 J/kg.°C | |
Dynamic Modulus of Elasticity | RT |
29.6 x 106psi |
RT | 204 GPa |
600°F |
27.4 x 106psi |
300°C | 190 GPa | |
800°F |
26.5 x 106psi |
400°C | 184 GPa | |
1000°F |
25.7 x 106psi |
500°C | 179 GPa | |
1200°F |
24.7 x 106psi |
600°C | 174 GPa | |
Melting Range | 2430-2482°F | - | 1332-1361°C | - |
RT= Room Temperature
Impact Strength
Test Temperature | Impact Strength | ||
°F | °C | ft-lbf | J |
RT | RT | 371 | 503 |
-320 | -196 | 461 | 625 |
Limited data
Impact strengths were generated using Charpy V-notch samples, machined from mill annealed plate.
Tensile Strength and Elongation
Form | Thickness/ Bar Diameter | Test Temperature | 0.2% Offset Yield Strength | Ultimate Tensile Strength | Elongation | ||||
in | mm | °F | °C | ksi | MPa | ksi | MPa | % | |
Sheet | 0.125 | 3.2 | RT | RT | 50 | 345 | 107 | 738 | 60 |
Sheet | 0.125 | 3.2 | 200 | 93 | 43 | 296 | 101 | 696 | 63 |
Sheet | 0.125 | 3.2 | 400 | 204 | 36 | 248 | 93 | 641 | 64 |
Sheet | 0.125 | 3.2 | 600 | 316 | 31 | 214 | 89 | 614 | 70 |
Sheet | 0.125 | 3.2 | 800 | 427 | 30 | 207 | 86 | 593 | 74 |
Sheet | 0.125 | 3.2 | 1000 | 538 | 27 | 186 | 80 | 552 | 68 |
Sheet | 0.125 | 3.2 | 1200 | 649 | 26 | 179 | 75 | 517 | 68 |
Plate | 0.5 | 12.7 | RT | RT | 46 | 317 | 100 | 689 | 72 |
Plate | 0.5 | 12.7 | 200 | 93 | 41 | 283 | 97 | 669 | 74 |
Plate | 0.5 | 12.7 | 400 | 204 | 33 | 228 | 88 | 607 | 75 |
Plate | 0.5 | 12.7 | 600 | 316 | 29 | 200 | 82 | 565 | 71 |
Plate | 0.5 | 12.7 | 800 | 427 | 30 | 207 | 78 | 538 | 77 |
Plate | 0.5 | 12.7 | 1000 | 538 | 26 | 179 | 72 | 496 | 75 |
Plate | 0.5 | 12.7 | 1200 | 649 | 24 | 165 | 68 | 469 | 74 |
Bar | 1 | 25.4 | RT | RT | 46 | 317 | 103 | 710 | 66 |
Bar | 1 | 25.4 | 200 | 93 | 41 | 283 | 98 | 676 | 70 |
Bar | 1 | 25.4 | 400 | 204 | 35 | 241 | 89 | 614 | 71 |
Bar | 1 | 25.4 | 600 | 316 | 30 | 207 | 84 | 579 | 71 |
Bar | 1 | 25.4 | 800 | 427 | 31 | 214 | 81 | 558 | 73 |
Bar | 1 | 25.4 | 1000 | 538 | 28 | 193 | 75 | 517 | 72 |
Bar | 1 | 25.4 | 1200 | 649 | 23 | 159 | 69 | 476 | 71 |
RT= Room Temperature
Hardness
Form | Hardness, HRBW | Typical ASTM Grain Size |
Sheet | 87 | 3.5 - 5 |
Plate | 87 | 2 - 4.5 |
Bar | 82 | 1 - 4 |
All samples tested in solution-annealed condition.
HRBW = Hardness Rockwell “B”, Tungsten Indentor.
Welding and Fabrication
HASTELLOY® G-35® alloy is very amenable to the Gas Metal Arc (GMA/MIG), Gas Tungsten Arc (GTA/TIG), and Shielded Metal Arc (SMA/Stick) welding processes. For matching filler metals (i.e. solid wires and coated electrodes) that are available for these processes, and welding guidelines, please click here.
Wrought products of HASTELLOY® G-35® alloy are supplied in the Mill Annealed (MA) condition, unless otherwise specified. This solution annealing procedure has been designed to optimize the alloy’s corrosion resistance and ductility. Following all hot forming operations, the material should be re-annealed, to restore optimum properties. The alloy should also be re-annealed after any cold forming operations that result in an outer fiber elongation of 7% or more. The annealing temperature for HASTELLOY® G-35® alloy is 1121°C (2050°F), and water quenching is advised (rapid air cooling is feasible with structures thinner than 10 mm (0.375 in). A hold time at the annealing temperature of 10 to 30 minutes is recommended, depending on the thickness of the structure (thicker structures need the full 30 minutes). More details concerning the heat treatment of HASTELLOY® G-35® alloy, click here.
HASTELLOY® G-35® alloy can be hot forged, hot rolled, hot upset, hot extruded, and hot formed. However, it is more sensitive to strain and strain rates than the austenitic stainless steels, and the hot working temperature range is quite narrow. For example, the recommended start temperature for hot forging is 1204°C (2200°F) and the recommended finish temperature is 954°C (1750°F). Moderate reductions and frequent re-heating provide the best results, as described here. This reference also provides guidelines for cold forming, spinning, drop hammering, punching, and shearing of the HASTELLOY® alloys. G-35® alloy is stiffer than most austenitic stainless steels, and more energy is required during cold forming. Also, G-35® alloy work hardens more readily than most austenitic stainless steels, and may require several stages of cold work, with intermediate anneals.
While cold work does not usually affect the resistance of HASTELLOY® G-35® alloy to general corrosion, and to chloride-induced pitting and crevice attack, it can affect resistance to stress corrosion cracking. For optimum corrosion performance, therefore, the re-annealing of cold worked parts (following an outer fiber elongation of 7% or more) is important.
Tensile Data for Weldments
Welding Process | Form | Test Temperature | 0.2% Offset Yield Strength | Ultimate Tensile Strength | Elongation | |||
°F | °C | ksi | MPa | ksi | MPa | % | ||
Gas Tungsten Arc Welding (GTAW) | Transverse Sample from Welded Plate of Thickness 12.7 mm/0.5 in | RT | RT | 63.5 | 438 | 101.0 | 696 | 44.0 |
500 | 260 | 44.9 | 310 | 79.0 | 545 | 40.0 | ||
1000 | 538 | 36.1 | 249 | 65.0 | 448 | 37.0 | ||
Synergic Gas Metal Arc Welding (GMAW) | Transverse Sample from Welded Plate of Thickness 12.7 mm/0.5 in | RT | RT | 66.5 | 459 | 105.0 | 724 | 31.5 |
500 | 260 | 48.6 | 335 | 80.5 | 555 | 43.0 | ||
1000 | 538 | 35.7 | 246 | 72.7 | 501 | 51.0 | ||
All Weld Metal Sample of Diameter 12.7 mm/0.5 in from Cruciform | RT | RT | 70.5 | 486 | 101.0 | 696 | 43.0 | |
500 | 560 | 48.8 | 336 | 78.0 | 538 | 46.0 | ||
1000 | 238 | 43.8 | 302 | 64.0 | 441 | 42.0 |
Charpy V-Notch Impact Data for Weldments
Welding Process | Form | Notch Position | Test Temperature | Impact Strength | ||
°F | °C | ft.lbf | J | |||
Synergic Gas Metal Arc Welding (GMAW) | Transverse Sample from Welded Plate of Thickness 12.7 mm/0.5 in | Mid-Weld | RT | RT | 201 | 273 |
-320 | -196 | 153 | 207 | |||
Heat Affected Zone | RT | RT | >264 | >358 | ||
-320 | -196 | >264 | >358 |
Room Temperature Charpy V-Notch Data for Aged Weldments
(Synergic Gas Metal Arc Welding, Transverse Samples from Welded 12.7 mm Plate)
Notch Position | Aging Time | Aging Temperature | Impact Strength | ||
h | ºF | ºC | ft.lbf | J | |
Mid-Weld | 2000 | 800 | 427 | 223 | 302 |
Mid-Weld | 2000 | 900 | 482 | 219 | 297 |
Mid-Weld | 2000 | 1000 | 538 | 224 | 304 |
Mid-Weld | 2000 | 1100 | 593 | 125 | 169 |
Mid-Weld | 2000 | 1200 | 649 | 79 | 107 |
Specifications and Codes
Specifications
HASTELLOY® G-35® alloy (N06035) | |
Sheet, Plate & Strip | SB 575/B 575P= 43 |
Billet, Rod & Bar | SB 574/B 574B 472P= 43 |
Coated Electrodes | SFA 5.11/ A 5.11 (ENiCrMo-22)F= 43 |
Bare Welding Rods & Wire | SFA 5.14/ A 5.14 (ERNiCrMo-22)F= 43 |
Seamless Pipe & Tube | SB 622/B 622P= 43 |
Welded Pipe & Tube | SB 619/B 619SB 626/B 626P= 43 |
Fittings | SB 366/B 366SB 462/B 462P= 43 |
Forgings | SB 564/B 564SB 462/B 462P = 43 |
DIN | No. 2.4643 NiCr33Mo8 |
TÜV | - |
Others | NACE MR0175ISO 15156ASME Code CaseNo. 2484 |
Codes
HASTELLOY® G-35® alloy (N06035) | |||
ASME | Section l | - | |
Section lll | Class 1 | - | |
Class 2 | - | ||
Class 3 | - | ||
Section Vlll | Div. 1 |
800°F (427°C)1 |
|
Div. 2 | - | ||
Section Xll | - | ||
B16.5 |
800°F (427°C)2 |
||
B16.34 |
800°F (427°C)2 |
||
B31.1 | - | ||
B31.3 | 800°F (427°C) | ||
VdTÜV (doc #) | - |
1Plate, Sheet, Bar, Forgings, fittings, welded pipe/tube, seamless pipe/tube
2Plate, Bar, Forgings, seamless pipe/tube
Disclaimer
Haynes International makes all reasonable efforts to ensure the accuracy and correctness of the data displayed on this site but makes no representations or warranties as to the data’s accuracy, correctness or reliability. All data are for general information only and not for providing design advice. Alloy properties disclosed here are based on work conducted principally by Haynes International, Inc. and occasionally supplemented by information from the open literature and, as such, are indicative only of the results of such tests and should not be considered guaranteed maximums or minimums. It is the responsibility of the user to test specific alloys under actual service conditions to determine their suitability for a particular purpose.
For specific concentrations of elements present in a particular product and a discussion of the potential health affects thereof, refer to the Safety Data Sheets supplied by Haynes International, Inc. All trademarks are owned by Haynes International, Inc., unless otherwise indicated.