Hiperco 27 (UNS K92650, ASTM A801 Type 2)
Product Introduction
Hiperco 27 (UNS K92650, ASTM A801 Type 2, 1J27) is a high-performance soft magnetic alloy belonging to the iron-cobalt-chromium/vanadium family; it contains approximately 27% cobalt, with the remainder consisting of iron and trace functional elements.
It is renowned as the "most machinable" among high-magnetic-induction alloys. Its ductility and toughness are significantly superior to those of Hiperco 50, enabling it to be fabricated into thin strips, stamped into complex shapes, and wound into magnetic cores.
Our general logic for selecting this class of soft magnetic alloys is straightforward: for applications demanding the utmost in magnetic performance-provided the geometry is simple and material brittleness is acceptable-we recommend Hiperco 50. However, for applications involving complex geometries or requiring stamped components, Hiperco 27 stands as the only viable option. While its 27% cobalt content results in a magnetic saturation level that falls just slightly short of the absolute maximum, its ability to be bent, stamped, and formed without cracking addresses the practical requirements of the vast majority of engineering applications.
Machining and Welding
Hiperco 27 is easier to machine than Hiperco 50; however, it remains a high-barrier material, and several strict rules must be clearly understood.
1. Heat Treatment-Soft magnetic properties are "forged" through heat.
2. Cold Working-Suitable for stamping, but caution must be exercised regarding work hardening.
3. Machining-Most machining operations should be performed before the final heat treatment.
4. Welding-Optional; however, post-weld heat treatment is mandatory.
5. Post-Heat Treatment Handling-Never strike or deform the material; doing so will destroy its magnetic properties and necessitate re-annealing.
For more information, please contact:
Email: susan@lorkgroup.com
WhatsApp: +86 19937075488
Chemical Composition
(UNS K92650 / Hiperco 27)
| element | Content Range |
| Co | Approximately 27% |
| C | ≤0.025% |
| Cr | 0.5-0.75% |
| V | 0.5-1.0% |
| Fe | margin |
Key Impurities: Sulfur and phosphorus must be strictly controlled to ensure grain boundary purity.
Mechanical Properties
(Hiperco 27 Annealed)
| Material | Numerical Value |
| Tensile Strength | 550-650 MPa |
| Yield Strength (0.2%) | ≥ 800 MPa |
| Elongation | 16% |
| Hardness | Approx. 150–180 HV (B90 or higher) |
| Resistivity | 0.19 μΩ·m |
Magnetic Properties
(Hiperco 27 after optimal heat treatment)
| Performance Specifications | ASTM A801 Type 2 |
| Saturation Magnetic Induction (Bs) | 2.36 T(23600 Gauss) |
| Coercivity (Hc) | 135-239 A/m(1.7-3.0 Oe) |
| Initial permeability | ≥800 |
| Maximum Permeability | 8000-20000 |
Typical applications
Typical applications for Hiperco 27 include:
Aerospace: Aircraft Generator Rotors and Stators, Actuator Magnetic Cores, Radar System Magnetic Shielding, Missile Actuator Electromagnetic Components
Precision Motors: High Power Density Permanent Magnet Motor Magnetic Circuits, Magnetic Bearings, Torque Motors
Electromagnetic Components: Relay Cores, Solenoid Valves, Magnetic Pole Pieces, Electromagnet Cores
Precision Sensors: High-Sensitivity Sensor Magnetic Circuits, Magnetic Shielding Enclosures
Technical Consultation Before Quotation
We have compiled a summary of the key technical parameters for Hiperco 27, covering points frequently discussed in past consultations and procurement orders, to facilitate rapid quotation.
Dimensions: Thickness (typically 0.05–6.35 mm), Width
Condition: Cold-rolled Hard (requiring customer annealing) or Fully Heat-treated (soft magnetic properties already activated)?
Surface Finish: 2B Cold-rolled, Bright Annealed
Magnetic Property Requirements: Are there specific target specifications for Bs and Hc?
Recommended Material Conditions:
Requires subsequent stamping/forming → Procure Cold-Rolled (Hard) condition; perform annealing after processing.
Ready for direct use (finished product) → Procure Heat-Treated condition (verify that Hydrogen Annealing has been completed).
High-End Aerospace Grade → Requires the original manufacturer's AMS 7705-grade MTC (Material Test Certificate), accompanied by a complete heat treatment curve report.
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