Alloy 825 | 2.4858 directly from stock & cut to your required dimensions!
The Alloy 825 has a very good corrosion resistance and a particularly good resistance to phosphoric and sulfuric acid. The material is easy to weld and can be used in operating conditions at low temperatures up to approx. 500°C.
Areas of application
The 2.4858 (Alloy 825) is mainly used as pipeline and pipes in the oil and gas industry. The nickel-based Alloy 825 is also used in the food industry (organic acids) and in the nuclear industry.
|Corrosion resistance||very good|
|Machinability||3 (1 = bad - 10 = good)|
|Corrosion class||10 (1 = bad - 10 = good)|
Welding: Alloy825 is easy to weld. The steels 2.4621 and 2.4831 are recommended as filler metals.
Corrosion resistance: The corrosion resistance is outstandingly excellent compared to conventional chrome-nickel-molybdenum steel and the resistance to chloride-induced intergranular corrosion, pitting and crevice corrosion as well as stress corrosion cracking is the main application property of this material.
Forging: Before forging, the steel should be warm up to 1150°C and 1180°C. The forging process takes place at 1150°C to 900°C followed by rapid air or water cooling. When the work process reaches 900°C, it must be heated up again, for example forging with multiple heats.
Cold forming: Due to the higher strain hardening than with austenitic stainless steels, higher forming forces are required.
Machining: the machining is difficult due to the high nickel alloy content. Turning should not take place when the cut is interrupted due to its tendency to work hardening, low cutting speeds and feed rates must be selected.
|Cold forming||is possible|
|Cold upsetting||is possible|
|Machining||with low cutting speed and feed|
|Open die and drop forging||is possible|
|Machine processing||not possible|
|Density (kg / dm³)||8,05 to 8,14|
|Electrical resistance at 20°C (Ω mm2 /m)||1,125|
|Electrical resistance at 550°C (Ω mm2 /m)||1,260|
|Thermal conductivity at 20°C (W/m K)||10,8 to 11,1|
|Specific heat capacity at 20°C (J/kg K)||440|
|Specific heat capacity at 600°C (J/kg K)||590|
|Modulus of elasticity at 20°C (GPa)||195,5|
|Modulus of elasticity at 500°C (GPa)||168,0|
Resistance to oxidizing and reducing (hot) acids
Mechanical properties at room temperature:
|≥ 240||≥ 35||≥ 100 (landscape)|
Minimum tensile strength Rm (geglüht): 590 N/mm2
Brinell hardness: 135-170
|Temperature in °C||Cooling|
|Hot forming||1150 - 900||air, water|
|Solution annealing (+AT)||920 - 980||water, air|
Alloy 825 Flat, forged, solution annealed/ water
The processing with the saw is a mechanical processing of the material, which results in a significantly lower unintended deformation and increased hardness for the existing structure, such as the thermal cutting.
Thus, the machined workpiece has a homogeneous structure even at the edge, which does not change in the continuation of the material.
This circumstance allows immediate finishing of the workpiece with milling or drilling . So it is not necessary to anneal the material or make a similar operation beforehand.
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Notice: Specifications contained in following data sheet are provided as a description, liability is excluded!