Super Alloy HASTELLOY(r) G30(r) (UNS N06030)

Topics Covered

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

Introduction

Super alloys or high performance alloys are used in environments with very high temperature above 540ºC (1000ºF) where deformation resistance and high surface stability are chiefly required. They have good oxidation and creep resistance. Cobalt-base, nickel-base and iron-base alloys are the three major types of super alloys. The iron-base super alloys are generally wrought alloys provided with stainless steel technology. Nickel-base and cobalt-base super alloys may be cast or wrought based on its composition or application. Super alloys can be generally forged, rolled to sheet or produced in different shapes. Highly alloyed compositions are formed as castings. They can be strengthened using hardening techniques like work hardening, solid-solution hardening and precipitation hardening.

HASTELLOY(r) G30(r) alloy is corrosion resistant and has the ability to oxidize acids.

The following sections will provide a detailed description of HASTELLOY(r) G30(r) alloy.

Chemical Composition

The following table shows the chemical composition of HASTELLOY(r) G30(r) alloy.

Element Content (%)
Nickel, Ni 43
Chromium, Cr 28.0-31.5
Iron, Fe 13-17
Cobalt, Co  5
Molybdenum, Mo 4-6
Tungsten, W 1.50 - 4
Manganese, Mn  1.50
Copper, Cu 1 - 2 .40
Silicon, Si 0.8
Phosphorous, P  0.040
Carbon, C  0.030
Sulfur, S  0.020

Physical Properties

The physical properties of HASTELLOY(r) G30(r) alloy are given in the following table.

Properties Metric Imperial
Density 8.22 g/cm³ 0.297 lb/in³
Melting point 1371ºC 2500ºF

Mechanical Properties

The mechanical properties of HASTELLOY(r) G30(r) alloy are given in the following table.

Properties Metric Imperial
Tensile strength 1096 MPa 159000 psi
Yield strength (@0.2%) 1000 MPa 145000 psi
Modulus of elasticity (plate heat treated to 1177°C, rapid quenched) 202 GPa 29300 ksi
Elongation at break (in 50.8 mm) 12% 12%
Reduction of area 57% 57%
Hardness, Brinell (converted from Rockwell C hardness) 304 304
Hardness, Knoop (converted from Rockwell C hardness) 326 326
Hardness, Rockwell C 32 32
Hardness, Vickers (converted from Rockwell C hardness) 316 316

Thermal Properties

The thermal properties of HASTELLOY(r) G30(r) alloy are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@30-316ºC/86-601ºF) 14.4 µm/m°C 8 µin/in°F
Thermal conductivity 10.2 W/mK 70.8 BTU in/hr.ft2.°F

Other Designations

Equivalent materials to HASTELLOY(r) G30(r) alloy are the following:

  • ASTM B366
  • ASTM B581
  • ASTM B582
  • ASTM B619
  • ASTM B622
  • DIN 2.4603

Fabrication and Heat Treatment

Machinability

HASTELLOY(r) G30(r) alloy can be machined using conventional techniques employed for iron based alloys. The quality of the alloy can be improved with the utilization of water-base coolants. Heavy duty machining tools and equipment can be used prior to cutting in order to reduce chattering or work-hardening of the alloy.

Forming

HASTELLOY(r) G30(r) alloy can be formed through conventional forming methods.

Welding

Welding of HASTELLOY(r) G30(r) alloy is performed through commonly used welding techniques like gas tungsten arc welding, shielded metal-arc welding, metal-arc welding and submerged-arc welding. However, an alloy filler metal that suits this alloy should be used.

Heat Treatment

HASTELLOY(r) G30(r) alloy is capable of being annealed. However, this alloy must be solution-annealed after hot forming in order to restore its resistance to corrosion.

Forging

As HASTELLOY(r) G30(r) alloy has good ductile property, it can be forged easily.

Cold Working

HASTELLOY(r) G30(r) alloy can be cold worked using standard tooling methods. As plain carbon steels produce galling, they are not preferred for forming HASTELLOY(r) G30(r) alloy. Galling can be minimized with the help of heavy duty lubricants.

Annealing

HASTELLOY(r) G30(r) alloy can be annealed at 1177ºC (2150ºF) followed by rapid cooling of air and water quenching.

Hardening

HASTELLOY(r) G30(r) alloy can be hardened by cold working.

Applications

The following are the major applications of HASTELLOY(r) G30(r) alloy:

  • Chemical process equipment
  • Reheater tubes
  • Pump components
  • Agitator blades
  • Reboilers in nuclear waste reprocessing.

Tell Us What You Think

Do you have a review, update or anything you would like to add to this article?

Leave your feedback
Submit