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Incoloy825 hex nut
Name | Alloy825 Hex Nut |
Standard | DIN934,ISO4032,ASME B18.2.2 |
Size Range | M5-M64 or non-standard as requested |
Finish | Bright&Clean |
Marking | HT&FST or customization |
Material | Alloy825,2.4858, UNS N08825 |
Grade | Grade 70, |
Certificates | EN10204-3.1B |
Non-standards | OEM is available, according to drawing or samples |
Samples | Samples available |
Package | Bulk in box and then in cartons, then on pallets, or according to customers' requirement. |
| Payment | T/T,Western Union |
INCOLOY825
What material is the Incoloy 825?
INCOLOY825 ,UNS N08825, 2.4858, Alloy825
astm-b564.pdf
Excellent resistance to reducing and oxidizing acids
Good resistance to stress-corrosion cracking
Satisfactory resistance to localized attack like pitting and crevice corrosion
Very resistant to sulfuric and phosphoric acids
Good mechanical properties at both room and elevated temperatures up to approximately 1000°F
Permission for pressure-vessel use at wall temperatures up to 800°F
Chemical composition of Incoloy825
| Alloy | % | Ni | Cr | Fe | Ti | Mo | C | Mn | S | P | Si | Al | Cu |
| 825 | Min. | 38 | 19.5 | 22 | 0.6 | 2.5 | 1.5 | ||||||
| Max. | 46 | 23.5 | 1.2 | 3.5 | 0.05 | 1.0 | 0.03 | 0.03 | 0.5 | 0.2 | 3.0 |
Physical properties of Incoloy825
| Density | 8.14 g/cm³ |
| Melting point | 1370-1400 ºC |
Incoloy825 material properties
| Type | Yield strength Rp0.2, MPa | Tensile strength Rm, MPa | Elongation [%] | Hardness [HRB] | ||
BAR | ≥ 324 | ≥ 690 | ≥ 45 | ≤ 90 |
formic acid, 0.5% potassium permanganate, balance water; 130°C: 0.038 mm/year
In mixture of 40% acetic acid, 6% propionic acid, 20% butane, 5% pentane, 8% ethyl acetate, 5% methyl ethyl ketone, plus other esters and ketones; 175°C: 0.051 mm/year
In liquid phthalic anhydride containing phthalic acid, some water, and small amounts of maleic acid, maleic anhydride, benzoic acid, and napthaquinones. On re- flux plate of crude phthalic anhydride still; 165-260°C; 0.2 mm/year
Nitric acids mixtures corrosion rates:
In evaporator during concentration of nitric acid solution saturated with potassium nitrate and containing chlorides:
- liquid 40–70% HNO3 + 0.2–0.02% Cl; 110°C: 0.1 mm/year
- vapor, 10–50% HNO3, 0.05–1.5% Cl: 0.279 mm/year
In evaporator during concentration of nitric acid solution from 35–45% nitric acid, saturated with zirconyl nitrate and containing 10–35% ZrO(NO3)2 crystals 120°C:
- liquid: 0.533 mm/year
- vapor: 0.66 mm/year
Liquid solution of 53% nitric acid containing 1% hydrofluoric acid, 80°C:
- liquid 5.08 mm/year
- vapor: 2.18 mm/year
In evaporator during concentration of raffinate solution containing 30–40% nitric liquid acid and variable chlorides up to 2000 ppm Cl, 80°C:
- liquid 0.02 mm/year
- vapor: 0.028 mm/year
Phosphoric acid H3PO4 - Alloy 825 excels in phosphoric acid applications. Plant tests corrosion rates for various phosphoric acid solutions are following:
Recycle liquor from evaporator fume scrubber containing 15% phosphoric acid, 20% hexafluorosilicic acid and 1% sulphuric acid, 80°C: 0.025 mm/year
Slurry in digester tank. Mixture contains 20% H3PO4, 2% H2SO4, 1% HF, 40% H2O, plus CaSO4, 85°C: 0.02 mm/year
Slurry containing 37% H3PO4 (27% P2O5) in acid transfer tank. Velocity 1 m/s, temperature 75°C: 0.02 mm/year
Evaporator heated with hot gases in acid containing 53% H3PO4, 1–2% H2SO4, 1.5% HF plus Na2SiF6, 120°C: 0.15 mm/year
In wet separator on top of concentrating drum in vapors from concentration of crude acid to 50–55% H3PO4 containing HF, 125°C: 0.79 mm/year
Atmospheric corrosion - Alloy 825 shows great resistance to atmospheric corrosion. Results of a 20 year exposure to atmosphere near the ocean at Kure Beach show that average weight loss is 8.7 mg/dm2 and the average pit was less than 0.025 mm deep.
Sulphure Stress Cracking SSC - Alloy 825 is a bit more resistant to SSC in caustic environment than Alloy C-276.
Stress-corrosion cracking - Alloy 825, when tested in boiling 42% Magnesium Chloride solution for 192h, was etched and pitted, but showed no cracks.
Weldability
Weldability - the alloy belongs to 45th weldability group according to ISO 15608. For brazing, p-number is equal 111, according to ASME/AWS.
Selection of welding consumables for Alloy C-276
Coated electrodes: ENiCrMo3
Filler metals: ERNiCrMo-3
If forged pieces are supposed to be welded and operate in an environment that could cause intergranural corrosion, the pieces should be given a stabilizing anneal to prevent sensitization of the heat-affected zone.
Heat treatment and working
Recommended working and heat treatment parameters for C-276 alloy:
Forging: 870-1175 °C
Stabilizing anneal: 940 °C; 1h
Some reduction must be accomplished between 870 and 980 °C during final forging in order to ensure maximum corrosion resistance.
The alloy should be cooled at a rate equal to or faster than air cooling. Stabilizing anneal of 1h restores corrosion resistance.
Chemical Processing
Pollution-control
Oil and gas well piping
Nuclear fuel reprocessing
Components in Pickling equipment like heating coils, tanks, baskets and chains
Acid production
Incoloy825 hex nut
Name | Alloy825 Hex Nut |
Standard | DIN934,ISO4032,ASME B18.2.2 |
Size Range | M5-M64 or non-standard as requested |
Finish | Bright&Clean |
Marking | HT&FST or customization |
Material | Alloy825,2.4858, UNS N08825 |
Grade | Grade 70, |
Certificates | EN10204-3.1B |
Non-standards | OEM is available, according to drawing or samples |
Samples | Samples available |
Package | Bulk in box and then in cartons, then on pallets, or according to customers' requirement. |
| Payment | T/T,Western Union |
INCOLOY825
What material is the Incoloy 825?
INCOLOY825 ,UNS N08825, 2.4858, Alloy825astm-b564.pdf
Excellent resistance to reducing and oxidizing acids
Good resistance to stress-corrosion cracking
Satisfactory resistance to localized attack like pitting and crevice corrosion
Very resistant to sulfuric and phosphoric acids
Good mechanical properties at both room and elevated temperatures up to approximately 1000°F
Permission for pressure-vessel use at wall temperatures up to 800°F
Chemical composition of Incoloy825
| Alloy | % | Ni | Cr | Fe | Ti | Mo | C | Mn | S | P | Si | Al | Cu |
| 825 | Min. | 38 | 19.5 | 22 | 0.6 | 2.5 | 1.5 | ||||||
| Max. | 46 | 23.5 | 1.2 | 3.5 | 0.05 | 1.0 | 0.03 | 0.03 | 0.5 | 0.2 | 3.0 |
Physical properties of Incoloy825
| Density | 8.14 g/cm³ |
| Melting point | 1370-1400 ºC |
Incoloy825 material properties
| Type | Yield strength Rp0.2, MPa | Tensile strength Rm, MPa | Elongation [%] | Hardness [HRB] | ||
BAR | ≥ 324 | ≥ 690 | ≥ 45 | ≤ 90 |
formic acid, 0.5% potassium permanganate, balance water; 130°C: 0.038 mm/year
In mixture of 40% acetic acid, 6% propionic acid, 20% butane, 5% pentane, 8% ethyl acetate, 5% methyl ethyl ketone, plus other esters and ketones; 175°C: 0.051 mm/year
In liquid phthalic anhydride containing phthalic acid, some water, and small amounts of maleic acid, maleic anhydride, benzoic acid, and napthaquinones. On re- flux plate of crude phthalic anhydride still; 165-260°C; 0.2 mm/year
Nitric acids mixtures corrosion rates:
In evaporator during concentration of nitric acid solution saturated with potassium nitrate and containing chlorides:
- liquid 40–70% HNO3 + 0.2–0.02% Cl; 110°C: 0.1 mm/year
- vapor, 10–50% HNO3, 0.05–1.5% Cl: 0.279 mm/year
In evaporator during concentration of nitric acid solution from 35–45% nitric acid, saturated with zirconyl nitrate and containing 10–35% ZrO(NO3)2 crystals 120°C:
- liquid: 0.533 mm/year
- vapor: 0.66 mm/year
Liquid solution of 53% nitric acid containing 1% hydrofluoric acid, 80°C:
- liquid 5.08 mm/year
- vapor: 2.18 mm/year
In evaporator during concentration of raffinate solution containing 30–40% nitric liquid acid and variable chlorides up to 2000 ppm Cl, 80°C:
- liquid 0.02 mm/year
- vapor: 0.028 mm/year
Phosphoric acid H3PO4 - Alloy 825 excels in phosphoric acid applications. Plant tests corrosion rates for various phosphoric acid solutions are following:
Recycle liquor from evaporator fume scrubber containing 15% phosphoric acid, 20% hexafluorosilicic acid and 1% sulphuric acid, 80°C: 0.025 mm/year
Slurry in digester tank. Mixture contains 20% H3PO4, 2% H2SO4, 1% HF, 40% H2O, plus CaSO4, 85°C: 0.02 mm/year
Slurry containing 37% H3PO4 (27% P2O5) in acid transfer tank. Velocity 1 m/s, temperature 75°C: 0.02 mm/year
Evaporator heated with hot gases in acid containing 53% H3PO4, 1–2% H2SO4, 1.5% HF plus Na2SiF6, 120°C: 0.15 mm/year
In wet separator on top of concentrating drum in vapors from concentration of crude acid to 50–55% H3PO4 containing HF, 125°C: 0.79 mm/year
Atmospheric corrosion - Alloy 825 shows great resistance to atmospheric corrosion. Results of a 20 year exposure to atmosphere near the ocean at Kure Beach show that average weight loss is 8.7 mg/dm2 and the average pit was less than 0.025 mm deep.
Sulphure Stress Cracking SSC - Alloy 825 is a bit more resistant to SSC in caustic environment than Alloy C-276.
Stress-corrosion cracking - Alloy 825, when tested in boiling 42% Magnesium Chloride solution for 192h, was etched and pitted, but showed no cracks.
Weldability
Weldability - the alloy belongs to 45th weldability group according to ISO 15608. For brazing, p-number is equal 111, according to ASME/AWS.
Selection of welding consumables for Alloy C-276
Coated electrodes: ENiCrMo3
Filler metals: ERNiCrMo-3
If forged pieces are supposed to be welded and operate in an environment that could cause intergranural corrosion, the pieces should be given a stabilizing anneal to prevent sensitization of the heat-affected zone.
Heat treatment and working
Recommended working and heat treatment parameters for C-276 alloy:
Forging: 870-1175 °C
Stabilizing anneal: 940 °C; 1h
Some reduction must be accomplished between 870 and 980 °C during final forging in order to ensure maximum corrosion resistance.
The alloy should be cooled at a rate equal to or faster than air cooling. Stabilizing anneal of 1h restores corrosion resistance.
Chemical Processing
Pollution-control
Oil and gas well piping
Nuclear fuel reprocessing
Components in Pickling equipment like heating coils, tanks, baskets and chains
Acid production
