Super Alloy Nicrofer 6030 (UNS N06690)

Topics Covered

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

Introduction

Nicrofer 6030 alloy is a nickel-chromium-iron alloy containing approximately 30 % of chromium that is ideal for using the alloy in oxidizing media. The alloy is characterized by good resistance to caustic cracking, fluoride-contaminated, hot nitric acid, and oxidation and sulfidation in high temperature gaseous environments. It also exhibits good ductility and high mechanical properties at both room and elevated temperatures.

The following datasheet will provide an overview of nicrofer 6030 alloy.

Chemical Composition

The chemical composition of nicrofer 6030 alloy is outlined in the following table.

Element Content (%)
Chromium, Cr 27-31
Iron, Fe 7-11
Silicon, Si 0.5
Copper, Cu 0.5
Manganese, Mn 0.5
Carbon, C 0.05
Sulfur, S 0.015
Nickel, Ni Balance

Physical Properties

The following table shows the physical properties of nicrofer 6030 alloy.

Properties Metric Imperial
Density 8.2 g/cm3 0.296 lb/in3
Melting point 1345-1375°C 2450-2510°F

Mechanical Properties

The mechanical properties of nicrofer 6030 alloy are displayed in the following table.

Properties Metric Imperial
Tensile strength 586 MPa 85 ksi
Yield strength 240 MPa 35 ksi
Elongation at break 30% 30%

Thermal Properties

The thermal properties of nicrofer 6030 alloy are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@100°C/212°F) 14.1 µm/m°C 7.8 µin/in°F
Thermal conductivity (@20°C/68°F) 12 W/mK 83 BTU.in/hrft².°F

Fabrication and Heat Treatment

Machinability

Conventional machining techniques that are used for machining iron-based alloys can be used.

Forming

Nicrofer 6030 alloy has excellent ductility, and can be readily formed by all conventional techniques.

Welding

The alloy can be welded using commonly used welding techniques such as gas-tungsten arc welding, shielded metal-arc welding, gas metal-arc welding and submerged-arc welding.

Forging

Forging can be readily accomplished in the temperature range of 1038 to 1204°C (1900 to 2200°F).

Hot Working

The alloy can be hot worked in the temperature range of 871 to 1204°C (1600 to 2200°F).

Cold working

Cold working may be performed using standard tooling.

Annealing

The alloy is annealed at 1038°C (1900°F) and then air cooled.

Hardening

Nicrofer 6030 alloy can be hardened by cold working.

Other Designations

Other designations that are equivalent to nicrofer 6030 alloy include the following:

  • ASTM B167
  • DIN 2.4642

Applications

The following are the list of applications of nicrofer 6030 alloy:

  • Duct work
  • High temperature burners
  • Petrochemical heaters and furnaces.

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