Incoloy庐 825 Plate 鈥� Corrosion-Resistant Nickel Alloy for Demanding Environments
猫咪社区 stocks Incoloy庐 alloy 825 nickel alloy plate in thicknesses from .1875″ (4.8mm) through 2.00″ (50.8mm) for corrosion resistant applications in the air pollution control, chemical and petrochemical, food processing, nuclear, offshore oil and gas production, ore processing, petroleum refining, steel pickling and waste disposal industries.
Available thicknesses for Incoloy庐 alloy 825:
| 3/16" | 1/4" | 3/8" | 1/2" | 5/8" | 3/4" |
| 4.8mm | 6.3mm | 9.5mm | 12.7mm | 15.9mm | 19mm |
| 1" | 1 1/4" | 1 1/2" | 1 3/4" | 2" | |
| 25.4mm | 31.8mm | 38.1mm | 44.5mm | 50.8mm |
Incoloy庐 alloy 825 (UNS N08825) is an austenitic nickel-iron-chromium alloy with additions of molybdenum, copper and titanium. It was developed to provide exceptional corrosion resistance in both oxidizing and reducing environments. This nickel alloy is resistant to chloride stress-corrosion cracking and pitting. The addition of titanium stabilizes Incoloy庐 alloy 825 against sensitization in the as-welded condition making the alloy resistant to intergranular attack after exposure to temperatures in a range that would sensitize un-stabilized stainless steels. The fabrication of Incoloy庐 alloy 825 is typical of nickel-base alloys, with material being readily formable and weldable by a variety of techniques.
Specification Sheet Overview
for Incoloy庐 alloy 825 (UNS N08825)
W.Nr. 2.4858:
An Austenitic Nickel-Iron-Chromium Alloy Developed for Exceptional Corrosion Resistance In Both Oxidizing and Reducing Environments
Plate Dimensions
Plate dimensions vary by grade, thickness, and mill availability.
Length
- Typical plate availability is 240鈥�252″
- Longer lengths in excess of 300″ are available in select grades and thicknesses
- Shorter lengths may apply depending on thickness and mill availability
Width
- Common widths include 60″, 79″, 96″, and 120″
Thickness Considerations
- Maximum available length and width will vary as thickness increases
Plate is supplied based on actual dimensions. In-house processing is available to meet required sizes.
General Properties
Incoloy庐 alloy 825 (UNS N08825) is an austenitic nickel-iron-chromium alloy with additions of molybdenum, copper and titanium. It was developed to provide exceptional resistance to numerous corrosive environments, both oxidizing and reducing.
The nickel content of Incoloy庐 alloy 825 makes it resistant to chloride stress-corrosion cracking, and combined with molybdenum and copper, provides substantially improved corrosion resistance in reducing environments when compared to conventional austenitic stainless steels. The chromium and molybdenum content of Incoloy庐 alloy 825 provides resistance to chloride pitting, as well as resistance to a variety of oxidizing atmospheres. The addition of titanium stabilizes the alloy against sensitization in the as-welded condition. This stabilization makes Incoloy庐 alloy 825 resistant to intergranular attack after exposure in the temperature range which would typically sensitize un-stabilized stainless steels.
Incoloy庐 alloy 825 is resistant to corrosion in a wide variety of process environments including sulfuric, sulfurous, phosphoric, nitric, hydrofluoric and organic acids and alkalis such as sodium or potassium hydroxide, and acidic chloride solutions.
The fabrication of Incoloy庐 alloy 825 is typical of nickel-base alloys, with material readily formable and weldable by a variety of techniques.
Applications
- Air Pollution Control
- Scrubbers
- Chemical Processing Equipment
- Acids
- Alkalis
- Food Process Equipment
- Nuclear
- Fuel Reprocessing
- Fuel Element Dissolvers
- Waste Handling
- Fuel Reprocessing
- Offshore Oil and Gas Production
- Seawater Heat Exchangers
- Piping Systems
- Sour Gas Components
- Ore Processing
- Copper Refining Equipment
- Petroleum Refining
- Air-cooled Heat Exchangers
- Steel Pickling Equipment
- Heating Coils
- Tanks
- Crates
- Baskets
- Waste Disposal
- Injection Well Piping Systems
Chemical Analysis
Typical Values (Weight %)
| Nickel | 38.0 min.鈥�46.0 max. | Iron | 22.0 min. |
| Chromium | 19.5 min.鈥�23.5 max. | Molybdenum | 2.5 min.鈥�3.5 max. |
| Molybdenum | 8.0 min.-10.0 max. | Copper | 1.5 min.鈥�3.0 max. |
| Titanium | 0.6 min.鈥�1.2 max. | Carbon | 0.05 max. |
| Niobium (plus Tantalum) | 3.15 min.-4.15 max. | Titanium | 0.40 |
| Carbon | 0.10 | Manganese | 1.00 max. |
| Sulfur | 0.03 max. | Silicon | 0.5 max. |
| Aluminium | 0.2 max. |
Density
0.294 lbs/in3
8.14 g/cm3
Specific Heat
0.105 BTU/lb-掳贵
440 J/kg-掳K
Modulus of Elasticity
28.3 psi x 106 (100掳贵)
196 MPa (38掳颁)
Magnetic Permeability
1.005 Oersted (渭 at 200H)
Thermal Conductivity
76.8 BTU/hr/ft2/ft-掳贵 (78掳贵)
11.3 W/m-掳K (26掳颁)
Melting Range
2500 鈥� 2550掳贵
1370 鈥� 1400掳颁
Electrical Resistivity
678 Ohm circ mil/ft (78掳贵)
1.13 渭 cm (26掳颁)
Linear Coefficient of Thermal Expansion
7.8 x 10-6 in / in掳贵 (200掳贵)
4 m / m掳颁 (93掳贵)
Mechanical Properties
Typical Room Temperature Mechanical Properties, Mill Annealed
0.2% Offset | Strength | in 2" | |||
|---|---|---|---|---|---|
| psi (min.) | (MPa) | psi (min.) | (MPa) | % (min.) | Rockwell B |
| 49,000 | 338 | 96,000 | 662 | 45 | 135-165 |
Incoloy庐 alloy 825 has good mechanical properties from cryogenic to moderately high temperatures. Exposure to temperatures above 1000掳贵 (540掳颁) can result in changes to the microstructure that will significantly lower ductility and impact strength. For that reason, Incoloy庐 alloy 825 should not be utilized at temperatures where creep-rupture properties are design factors. The alloy can be strengthened substantially by cold work. Incoloy庐 alloy 825 has good impact strength at room temperature, and retains it鈥檚 strength at cryogenic temperatures.
Table 6 – Charpy Keyhole Impact Strength of Plate
| 掳贵 | 掳颁 | ft-lb | J | |
| Room | Room | Longitudinal | 79.0 | 107 |
| Room | Room | Transverse | 83.0 | 113 |
| -110 | -43 | Longitudinal | 78.0 | 106 |
| -110 | -43 | Transverse | 78.5 | 106 |
| -320 | -196 | Longitudinal | 67.0 | 91 |
| -320 | -196 | Transverse | 71.5 | 97 |
| -423 | -253 | Longitudinal | 68.0 | 92 |
| -423 | -253 | Transverse | 68.0 | 92 |
Corrosion Resistance
The most outstanding attribute of Incoloy庐 alloy 825 is its excellent corrosion resistance. In both oxidizing and reducing environments, the alloy resists general corrosion, pitting, crevice corrosion, intergranular corrosion and chloride stress-corrosion cracking.
Resistance to Laboratory Sulfuric Acid Solutions
| 10% | 40% | 50% | |
| 316 | 636 (16.2) | >1000 (>25) | >1000 (>25) |
| Incoloy庐 825 | 20 (0.5) | 11 (0.28) | 20 (0.5) |
| Inconel庐 625 | 20 (0.5) | Not Tested | 17 (0.4) |
Stress-Corrosion Cracking Resistance
The high nickel content of Incoloy庐 alloy 825 provides superb resistance to chloride stress-corrosion cracking. However, in the extremely severe boiling magnesium chloride test, the alloy will crack after long exposure in a percentage of samples. Incoloy庐 alloy 825 performs much better in less severe laboratory tests. The following table summarizes the alloy’s performance.
Resistance to Chloride Stress Corrosion Cracking
| Test Solution | Alloy 316 | SSC-6MO | Incoloy庐 Alloy 825 | Inconel庐 Alloy 625 |
| 42% Magnesium Chloride (Boiling) | Fail | Mixed | Mixed | Resist |
| 33% Lithium Chloride (Boiling) | Fail | Resist | Resist | Resist |
| 26% Sodium Chloride (Boiling) | Fail | Resist | Resist | Resist |
Mixed 鈥� A portion of the samples tested failed in the 2000 hours of test. This is an indication of a high level of resistance.
Pitting Resistance
The chromium and molybdenum content of Incoloy庐 alloy 825 provides a high level of resistance to chloride pitting. For this reason the alloy can be utilized in high chloride environments such as seawater. It can be used primarily in applications where some pitting can be tolerated. It is superior to conventional stainless steels such as 316L, however, in seawater applications Incoloy庐 alloy 825 does not provide the same levels of resistance as SSC-6MO (UNS N08367) or Alloy 625 (UNS N06625).
Crevice Corrosion Resistance
Resistance to Chloride Pitting and Crevice Corrosion
Corrosion Attack* 掳贵 (掳颁)< /center> |
|
|---|---|
| 316 | 27 (-2.5) |
| Incoloy庐 825 | 32 (0.0) |
| 6MO | 113 (45.0) |
| Inconel庐 625 | 113 (45.0) |
*ASTM Procedure G-48, 10% Ferric Chloride
Intergranular Corrosion Resistance
Procedure A 262 Practice C | Procedure A 262 Practice B |
|
|---|---|---|
| 316 | 34 (.85) | 36 (.91) |
| 316L | 18 (.47) | 26 (.66) |
| Incoloy庐 825 | 12 (.30) | 1 (.03) |
| SSC-6MO | 30 (.76) | 19 (.48) |
| Inconel庐 625 | 37 (.94) | Not Tested |
Incoloy庐 825 Plate 鈥� Frequently Asked Questions
1. What is Nickel Alloy 825?
Nickel Alloy 825 (UNS N08825), commonly referred to by its trademarked name Incoloy庐 825, is an austenitic nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. It offers exceptional resistance to a broad range of corrosive environments, particularly reducing acids like sulfuric and phosphoric acid.
2. What are common applications for Alloy 825 plate?
Nickel Alloy 825 plate is used in:
鈥� Acid production and pickling equipment
鈥� Pollution control equipment
鈥� Oil and gas recovery systems
鈥� Marine exhaust systems
鈥� Chemical processing
鈥� Heat exchangers
鈥� Tanks and piping for handling acids and other aggressive chemicals
3. How does Alloy 825 perform in corrosive environments?
Alloy 825 offers excellent corrosion resistance in both oxidizing and reducing environments. It resists stress-corrosion cracking, pitting, and crevice corrosion, especially in chloride-containing media. It is also highly resistant to sulfuric and phosphoric acids.
4. What are the mechanical properties of Alloy 825?
Typical values for mill-annealed plate at room temperature:
鈥� Yield Strength (0.2% offset): 49,000 psi (338 MPa)
鈥� Ultimate Tensile Strength: 96,000 psi (662 MPa)
鈥� Elongation in 2″: 45% minimum
鈥� Hardness: 135-165 Rockwell B
5. What are the physical properties of Alloy 825?
鈥� Density: 0.294 lbs/in鲁 (8.14 g/cm鲁)
鈥� Specific Heat: 0.105 BTU/lb路掳贵 (440 J/kg路K)
鈥� Thermal Conductivity: 76.8 BTU/hr/ft2/ft-掳贵 (78掳贵) 11.3 W/m-掳K (26掳颁)
鈥� Electrical Resistivity: 678 Ohm circ mil/ft (78掳贵) 1.13 渭 cm (26掳颁)
6. Is Alloy 825 magnetic?
No, Alloy 825 is non-magnetic in the annealed condition.
7. What standards apply to Alloy 825 plate?
鈥� ASTM B424
鈥� ASME SB 424
8. Can Alloy 825 be welded and fabricated?
Yes. It has good weldability by all conventional welding processes. Alloy 825 is also readily formed using standard fabrication techniques suitable for austenitic stainless steels.
9. What thicknesses does 猫咪社区 stock in Alloy 825?
Sandmeyer Steel stocks Alloy 825 plate in thicknesses ranging from 3/16鈥� (4.8 mm) through 2鈥� (50.8 mm) to support a wide range of applications.