Super Alloy HASTELLOY(r) X alloy (UNS N06002)

Topics Covered

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

Introduction

Super alloys or high performance alloys are available in a variety of shapes and contain elements in different combinations to obtain a specific result. These alloys are of three types that include iron-based, cobalt-based and nickel-based alloys. The nickel-based and cobalt-based super alloys are available as cast or wrought based alloys according to composition and application.

Super alloys have good oxidation and creep resistance and can be strengthened by precipitation hardening, solid-solution hardening and work hardening methods. They can also function under high mechanical stress and high temperatures and also in places that require high surface stability.

HASTELLOY(r) X alloy is a wrought nickel base alloy comprising oxidation resistance and high temperature strength. This alloy is resistant to stress-corrosion cracking.

The following datasheet provides an overview of HASTELLOY(r) X alloy.

Chemical Composition

The chemical composition of HASTELLOY(r) X alloy is outlined in the following table.

Element Content (%)
Cr, Chromium 20.5-23
Fe, Iron 17-20
Mo, Molybdenum 8-10
Mn, Manganese 1 max
Si, Silicon 1 max
Ti, Titanium 0.15 max
Co, Cobalt 0.5-2.5
Al, Aluminum 0.5 max
Cu, Copper 0.5 max
C, Carbon 0.05-0.15
P, Phosphorus 0.04 max
S, Sulfur 0.03 max
W, Tungsten 0.2-1
B, Boron 0.008 max
Ni, Nickel Remainder

Physical Properties

The following table shows the physical properties of HASTELLOY(r) X alloy.

Properties Metric Imperial
Density 8.220 g/cm³ 0.297 lb/in³
Melting point 1316°C 2400°F

Mechanical Properties

The mechanical properties of HASTELLOY(r) X alloy are displayed in the following table.

Properties Metric Imperial
Tensile strength 755 MPa 109.5 Ksi
Yield strength 385 MPa 55.9 Ksi
Elastic modulus 205 GPa 29.8 psi
Reduction of area 22% 22%
Hardness, Rockwell B (converted from Brinell hardness) 87 87

Thermal Properties

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

Properties Metric Imperial
Thermal expansion co-efficient 13.0 µm/m°C 7.2 µin/in°F
Thermal conductivity 9.1 W/mK 63 BTU in/hr.ft².°F

Other Designations

Equivalent materials to HASTELLOY(r) X alloy are as follows.

AISI 680 AMS 5587 AMS 5754 ASTM B435 ASTM B572
AMS 5588 AMS 5536 AMS 5798 ASTM B619 ASTM B366
ASTM B622 ASTM B626 PWA 1038 DIN 2.4665 DIN 2.4603
GE B50A436 GE B50A463 GE B50T83A GE B50TF24 GE B50TF25
GE B50TF31

Fabrication and Heat Treatment

Cold Working

HASTELLOY(r) X alloy can be readily cold worked and requires a large amount of forming pressure due its high stiffness characteristic. Solution annealing can be performed after this alloy is cold worked.

Welding

Welding processes suitable for HASTELLOY(r) X alloy include shielded metal arc welding, resistance welding and TIG or MIG. Usage of a corresponding filler metal is recommended whereas post heating and preheating are not recommended.

Forging

Conventional methods are used for hot forging HASTELLOY(r) X alloy.

Forming

Standard processing and tooling methods are used for forming different product forms of HASTELLOY(r) X alloy.

Machinability

Conventional methods are used for machining HASTELLOY(r) X alloy.

Hardening

HASTELLOY(r) X alloy can be hardened by cold working and to a limited extent by aging. This alloy cannot be hardened by the standard heating methods.

Heat Treatment

HASTELLOY(r) X alloy is mostly solution annealed at 1177°C (2150°F) and then cooled rapidly.

Aging

HASTELLOY(r) X alloy is first solution heat treated and then aged at 649-871°C (1200-1600°F). Increase in hardness and strength can be obtained when this alloy is under the aging temperature for prolonged hours.

Applications

HASTELLOY(r) X alloy is used industrial furnace applications such as structural components. This alloy is also used in gas turbines in the hot combustor zone sections and petrochemical process equipment.

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