Super Alloy Pyromet 601 (UNS N06601)

Topics Covered

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

Introduction

Pyromet 601 alloy is a nickel-chromium-iron alloy that has excellent oxidation resistance at high temperatures. It also possesses high temperature strength and corrosion resistance, which makes it suitable for applications where heat and corrosion resistance are the primary considerations.

The following section will discuss in detail about Pyromet 601 alloy.

Chemical Composition

The chemical composition of Pyromet 601 alloy is outlined in the following table.

Element Content (%)
Nickel, Ni 58 - 63
Chromium, Cr 21-25
Aluminum, Al 1-1.7
Manganese, Mn 1
Copper, Cu 1
Silicon, Si 0.5
Carbon, C 0.1
Sulfur, S 0.015

Physical Properties

The following table shows the physical properties of Pyromet 601 alloy.

Properties Metric Imperial
Density 8.11 g/cm3 0.293 lb/in3
Melting point 1349°C 2460°F

Mechanical Properties

The mechanical properties of Pyromet 601 alloy are displayed in the following table.

Properties Metric Imperial
Tensile strength (Solution annealed) 760 MPa 110000 psi
Yield strength (Solution annealed) 450 MPa 65300 psi
Elongation at break (Solution annealed) 42% 42%

Thermal Properties

The thermal properties of Pyromet 601 alloy are given in the following table

Properties Metric Imperial
Thermal expansion co-efficient (@20-100°C/68-212°F) 13.75 µm/m°C 7.639 µin/in°F
Thermal conductivity 11.2 W/mK 77.7 BTU.in/hrft².°F

Fabrication and Heat Treatment

Machinability

Pyromet 601 alloy can be machined by all conventional machining techniques. The alloy tends to work-harden during machining.

Forming

The alloy can be readily formed by all conventional methods. It is necessary to clear all traces of lubricant after forming as embrittlement of the alloy may occur at high temperatures.

Welding

Pyromet 601 alloy can be welded using conventional welding techniques such as gas-tungsten arc welding, shielded metal-arc welding and submerged arc welding.

Forging

Forging of Pyromet 601 alloy can be carried out at temperatures from 1038 to 1232°C (1900 to 2250°F).

Hot Working

The alloy is hot worked at temperatures from 871 to 1232°C (1600 to 2250°F).

Cold Working

The alloy can be cold worked using standard tooling.

Annealing

Annealing of Pyromet 601 alloy is performed at 1149°C (2100°F) followed by rapid cooling to avoid thermal cracking.

Other Designations

Other designations that are equivalent to Pyromet 601 alloy include the following:

  • DIN 2.4851
  • ASTM B166
  • ASTM B167
  • ASTM B168
  • AMS 5715
  • AMS 5870

Applications

The following are the list of applications of Pyromet 601 alloy:

  • Annealing tubes
  • Flame shields
  • Muffles
  • Combustor components
  • Condenser tubes
  • Process heaters.

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