Super Alloy HAYNES(r) 25 (UNS R30605)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Other Designations
Fabrication and Heat Treatment
     Machinability
     Forming
     Welding
     Forging
     Hot Working
     Cold Working
     Annealing
     Aging
     Hardening
Applications

Introduction

Super alloys or high performance alloys contain many elements in a variety of combinations to reach a desired result. These alloys are good for use in environments with high temperatures and severe mechanical stress, and also in cases where high surface stability is needed. Super alloys provide good creep and oxidation resistance.

Strengthening of super alloys is performed by work hardening, solid-solution hardening, and precipitation hardening methods.

HAYNES(r) 25 is cobalt-based wrought alloy that is resistant to oxidation and carburization coupled with excellent high temperature strength. Even in the work hardened state, it is non-magnetic.

The following datasheet will provide more details about HAYNES(r) 25.

Chemical Composition

The following table shows the chemical composition of HAYNES(r) 25.

Element Content (%)
Cobalt, Co 49.3
Chromium, Cr 20
Tungsten, W 15
Nickel, Ni 10
Iron, Fe 3
Manganese, Mn 1.5
Silicon, Si 1
Carbon, C 0.15
Sulfur, S 0.030
Phosphorous, P 0.040

Physical Properties

The physical properties of HAYNES(r) 25 are outlined in the following table.

Properties Metric Imperial
Density 9.13 g/cm³ 0.33 lb/in³
Melting point 1382°C 2520°F

Other Designations

Equivalent materials to HAYNES(r) 25 are:

  • AISI 670
  • AMS 5537
  • AMS 5759
  • AMS 5796
  • ASTM F90
  • GE B50T26
  • GE B50TF1
  • MIL C-24252 Comp 1

Fabrication and Heat Treatment

Machinability

Traditional machining methods and tooling such as carbide tools or high-speed steel tools can be used for HAYNES(r) 25. However it is not suitable to use carbide tools while milling, drilling or tapping. In these cases, it is better to use only high-speed steel tools

Forming

HAYNES(r) 25 can be formed by machining, cold working, welding, and forging.

Welding

HAYNES(r) 25 is weldable using metal-arc welding, gas-tungsten arc welding, and shielded metal-arc welding. It is not suitable to use submerged-arc welding method.

The surface to be welded should be clean and free from hydrocarbon products or grease.

Forging

HAYNES(r) is basically forged in the annealed condition for optimum properties.

Hot Working

Hot working of HAYNES(r) 25 can be performed if required.

Cold Working

HAYNES(r) 25 can be cold worked using conventional tooling.

Annealing

Solution annealing of HAYNES(r) 25 can be performed in case of extreme cold working at 1204°C (2200°F) and then followed by air cooling.

Aging

Age-hardening heat treatment can be performed on HAYNES(r) 25 at 482°C (900°F) after solution annealing heat treatment is completed.

Hardening

HAYNES(r) 25 can be hardened by cold working only. If required an aging heat treatment can be performed to slightly improve hardness and strength.

Applications

HAYNES(r) 25 can be used in gas turbine high temperature components and industrial furnace applications such as liners, muffles, and structural parts.

Comments

  1. NIVIN VINCENT NIVIN VINCENT India says:

    Sir, Is it possible to remove material from Haynes 25 using EDM machining?

The opinions expressed here are the views of the writer and do not necessarily reflect the views and opinions of AZoM.com.

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