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Short Description:
Super Invar 32-5, a magnetic, austenitic, solid solution alloy containing iron, nickel and cobalt, is designed to provide minimum thermal expansion at room temperatures. This alloy also exhibits austenite stability to service temperatures at least -67°F (-55°C) and thermal expansion properties less than those of Invar 36 alloy (36% nickel-iron) when used in the-67/203°F (-55/95°C) temperature range.l
Product Description
Super Invar is manufactured to provide minimum thermal expansion at room temperatures. The thermal expansion rates exhibited by this alloy is less than half of Invar 36 with a narrower application temperature range due to a lower Curie temperature. The alloy exhibits austenite stability to service temperatures at least -67°F (-55°C). ASTM F1684 and UNS K93500 are the specification references.
Although Super Invar has a substantially lower expansivity than Invar, it is susceptible to martensite transformation in the vicinity of -30°C. (-22°F), due to its reduced nickel content.
Super Invar has a very low coefficient of thermal expansion at temperatures from below -50°C. (-58°F.) up to about 100°C. (212°F.). It also exhibits thermal stability, a martensitic transformation inception point which is controlled, so as to fall well below the lowest temperature to be encountered in the particular application.
Super Invar 32-5 Chemical Composition
| C | Si | P | S | Cu | Mn | Co | Ni | Fe |
|---|---|---|---|---|---|---|---|---|
| ≤0.05 | ≤0.2 | ≤0.02 | ≤0.02 | 0.4-0.8 | 0.2-0.6 | 3.2-4.2 | 31.5-33.0 | balance |
Super Invar 32-5 Physical Properties
| Density | Melting range |
|---|---|
| 8.15 g/cm³ | 1430～1450℃ |
Super Invar 32-5 Alloy mechanical properties
| Properties | Tensile strength | Yield strength | Modulus of elasticity | Poisson’s ratio | Elongation at break (in 2 in. (50.8 mm)) | Hardness, Rockwell B (annealed) | Hardness, Rockwell B (cold worked) | Machinability |
|---|---|---|---|---|---|---|---|---|
| Metric | 483 MPa | 276 MPa | 145 GPa | 0.23 | 40% | 75 | 90 | 25 |
| Imperial | 70000 psi | 40000 psi | 21000 ksi | 0.23 | 40% | 75 | 90 | 25 |
- Bars & Rods & Foring Ring /Flanges
- Sheet & Plate
- Strip & Coil
- Welding Wire &Spring wire
- Seamless Tube & Welded Pipe
»Round Bar & Square Bar & Hexagon Bar
● Diameter : φ8～φ300mm Length:10mm-6000mm
● Hot forging, Hot Rolling, Cold Drawing
● Bright Surface, Polished Surface, Black Surface
»Tube & Pipe:Seamless Tube& Welded Pipe
● Cold Drawing Seamless Pipe： φ1.0～φ220mm
● Hot Extrusion pipe: φ50～φ250mm
● Others : U Blend Tube and Elbow
»Hot Rolled Plate & Cold Rolled Sheet
● Cold Rolling Sheet Thickness: ≦2.0mm Width:≦1500m
● Hot rolling Plate Thickness: ≧4.0mm Width: ≦2500m
»Strip & Tape Ribbon
● Thickness: ≧ 0.01mm Width: 15mm-300mm
● Cold rolling BA Strip, Hard & Soft Condition
»Straight Length Wire & Spool Wire
● Welding Wire: φ 0.1mm～6.0mm Cut length Rod: φ1.0～φ8.0mm
● Package : 5-25kg/Spool or Box
Super Invar 32-5 ApplicationsI
- Optical instruments
- Laser equipment
- Telescopes
- Metrology devices
- Ring laser gyroscopes
- Low expansion applications