HastelloyG35 Material introduction
HastelloyG35（UNS N06035）Compared with G, G3 and G30 in other Hastelloy G alloy series, Hastelloy G35 alloy does not contain copper, but has the highest content of chromium and nickel, the lowest content of iron, and a higher upper limit of carbon content (≤ 0.05%). The main purpose of developing this alloy is to meet the requirements of evaporator and other devices used in the very harsh corrosion environment in the production of wet process phosphoric acid. Compared with high chromium stainless steel and some iron nickel based corrosion resistant alloys traditionally used in wet process phosphoric acid, Hastelloy G35 alloy not only has excellent corrosion resistance, but also is less sensitive to chloride stress corrosion, and has excellent resistance to pitting and crevice corrosion.
HastelloyG35 alloy is mainly used as evaporator in the production of wet process phosphoric acid, and as pickling container for nitric acid and hydrofluoric acid solution; Equipment and components in corrosive environment of nitric acid and chloride in chemical industry; Caustic medium neutralization system device and parts resistant to high temperature (650 ℃) corrosion.
HastelloyG35 Chemical composition of alloy
Ni | Cu | Fe | Mn | C | Si | S |
more than | ≤0.30 | ≤2.00 | ≤0.50 | ≤0.050 | ≤0.60 | ≤0.015 |
Cr | Al | Mo | P | W | Co | V |
32.25-34.25 | ≤0.40 | 7.60-9.00 | ≤0.030 | ≤0.60 | ≤1.00 | ≤0.20 |
HastelloyG35 Overall corrosion resistance of alloy and comparison with Inconel 625
Test medium | concentration % | concentration | corrosion rate |
G-35 |
℃ | ℉ | mm/a | mpy |
hydrochloric acid | 1 5 10 20 | boiling 79 38 38 | boiling 175 100 100 | 0.05 1.23 0.17 0.42 | 2.1 48.3 6.7 16.6 |
Hydrobromic acid | 2.5 5 7.5 10 20 | boiling 93 93 79 66 | boiling 200 200 175 150 | ˂0.01 ˂0.01 ˂0.01 ˂0.01 0.44 | 0.1 0.1 ˂0.1 ˂0.1 17.2 |
hydrofluoric acid | 1 5 10 20 | 79 52 52 52 | 175 125 125 125 | 0.15 0.1 0.24 3.49 | 6.0 4.0 9.5 137.5 |
sulphuric acid | 10 20 30 40 50 | 93 93 93 79 79 | 200 200 200 175 175 | ˂0.01 0.01 2.62 ˂0.01 2.30 | 0.1 0.3 103.0 0.1 90.7 |
nitric acid | 20 40 60 70 | boiling boiling boiling boiling | boiling boiling boiling boiling | ˂0.01 0.01 0.06 0.10 | 0.1 0.4 2.2 3.8 |
phosphoric acid | 50 60 70 80 | boiling boiling boiling boiling | boiling boiling boiling boiling | 0.01 0.01 0.11 0.42 | 0.2 0.4 4.4 16.7 |
Chromic acid | 10 20 | 66 66 | 150 150 | 0.15 0.85 | 5.9 33.4 |
acetic acid | 99 | boiling | boiling | ˂0.01 | ˂0.1 |
formic acid | 88 | boiling | boiling | 0.07 | 2.6 |
ASTMG28A | - | boiling | boiling | 0.09 | 3.7 |
HastelloyG35 Physical and mechanical properties
density | melting point |
8.22g/cm³ | 1332-1361℃ |
HastelloyG35 Mechanical properties of alloys at room temperature
Material variety | Solution treatment temperature ℃ | Material size mm | tensile strength Ób/Mpa | yield strength Óp0.2/Mpa | Elongation δ/% |
sheet plate plate Bar Bar | 1135 1121 1121 1121 1121 | thick3.2 thick6.4 thick12.7 ɸ1.0 ɸ2.5 | 745 703 689 710 689 | 348 344 318 319 338 | 59 66 72 66 68 |
HastelloyG35 High temperature mechanical properties of alloys（Average value of medium thick plate and bar）
Test temperature ℃ | yield strength Óp0.2/Mpa | tensile strength Ób/Mpa | Elongation δ/% |
93 149 204 260 316 371 427 482 538 593 649 | 313 278 248 232 219 217 215 204 194 185 184 | 692 656 623 600 583 570 561 543 521 501 483 | 69.3 68.2 69.5 67.9 68.8 72.3 72.8 71.0 72.7 72.0 70.0 |
HastelloyG35 Impact toughness of alloy after solution and aging
Alloy heat treatment status | Impact energy/J | Alloy heat treatment status | Impact energy/J |
After solid solution427℃ prescription 2000h After solid solution482℃ prescription 2000h After solid solution538℃ prescription 2000h | >358 >358 >358 | After solid solution593℃ prescription 2000h After solid solution649℃ prescription 2000h Solid solution state | >358 104 >358 |
