product detail
Overview
Alloy 31 is an iron-nickel-chromium-molybdenum alloy with nitrogen addition. The alloy is designed to give properties in-between super austenitic and nickel base alloys for very demanding applications from the corrosion aspect. The high content of chromium and molybdenum gives an excellent resistance to localized corrosion.
Limiting Chemical Composition, %
Carbon ................................................................................................................................................................................0.015 max.
Silicon....................................................................................................................................................................................0.30 max.
Manganese............................................................................................................................................................................2.00 max.
Phosphorus............................................................................................................................................................................0.02 max.
Sulfur.......................................................................................................................................................................................0.01max.
Chromium..........................................................................................................................................................................26.00-28.00
Molybdenum..........................................................................................................................................................................6.00-7.00
Nickel ................................................................................................................................................................................30.00-32.00
Nitrogen.................................................................................................................................................................................0.15-0.25
Copper...............................................................................................................................................................................1.00-1.4. 00
Iron..........................................................................................................................................................................................Balance.
Physical Constants
Below are some physical constants and thermal properties of
Density | lb/in^3..................................................................................... 0.290 |
g/cm^3.......................................................................................8.00 | |
Melting Range | °F ....................................................................................2426-2498 |
°C....................................................................................1330-1370 | |
Electrical Resistivity | µΩ•cm.......................................................................................1.04 |
Permeability at 20°C | ................................................................................................1.001 |
Mechanical properties
Typical mechanical properties | tensile strength Rm N/mm2 | Yield Strength RP 0.2N/mm2 | Elongation A 5% | Brinell hardness HB |
Solution treatment | 650 | 275 | 40 | 220 |
Corrosion Resistance
VDM Alloy 31 (1.4562/N08031) is characterized by: outstanding corrosion resistance in alkaline and acidic halide-containing media. excellent resistance to sulfuric acid, even in highly concentrated form. excellent resistance to corrosion and erosion in phosphoric acid media.
In environments representative of phosphoric acid production, Alloy 31 is resistant up to 110°C (230°F) even if fluorhydric acid is present.
Alloy 31 has excellent resistance in pure and contaminated sulfuric acid over a broad range of concentrations up to 80 °C (176° F). In fresh water, UR™ 31 is almost not susceptible to corrosion.
Long-term immersions of Alloy 31 coupons have demonstrated that it is very resistant to pitting and crevice corrosion in renewed seawater up to 50°C (122°F), even if 0.5 ppm of free chlorine are added.
Heat Treatment
Heat Treatment of alloy 31 should be solution annealed between 2100 and 2150°F (1149 and 1177°C) and quickly cooled.
Forms
We provide you with a variety of product forms, including but not limited to
• Bar/Rod
• Pipe/Tube
• Coil/Strip
• Plate/Sheet/Circle
• Wire
• Fitting (Flange, Elbow, Tee...)
• Customize