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Compare Materials

Review three alloy families side by side by relative performance, representative mechanical properties, service conditions and documentation scope.

Compare exactly three distinct materials.

01

Summary

Material
718

Inconel 718

UNS N07718

A precipitation-hardened nickel alloy for demanding loaded assemblies and elevated-temperature service.

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625

Inconel 625

UNS N06625

Strong corrosion resistance in chloride-bearing and marine environments across a broad temperature range.

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C-276

Hastelloy C-276

UNS N10276

A nickel-molybdenum-chromium alloy for severe chemical-processing and mixed-media environments.

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02

Performance overview

Relative BYBOLT indicators for preliminary comparison only; they are not engineering design values.

Corrosion resistance
Inconel 71878/100
Inconel 62592/100
Hastelloy C-27698/100
Tensile strength
Inconel 71896/100
Inconel 62576/100
Hastelloy C-27666/100
High-temperature performance
Inconel 71895/100
Inconel 62584/100
Hastelloy C-27670/100
Oxidation resistance
Inconel 71890/100
Inconel 62588/100
Hastelloy C-27680/100
03

Mechanical properties

Representative room-temperature references. Product form, section size, heat treatment and governing specification control acceptance values.

Typical tensile strength
Inconel 718Typically 1,275 MPa or greater in common aged bar specifications
Inconel 625Typically 800-1,000 MPa, depending on product form and condition
Hastelloy C-276Typically 690 MPa or greater in common solution-annealed product specifications
Typical yield strength
Inconel 718Typically 1,035 MPa or greater in common aged bar specifications
Inconel 625Typically 340-630 MPa, depending on product form and condition
Hastelloy C-276Typically 280 MPa or greater, depending on product form
Typical elongation
Inconel 718Typically 12% or greater, depending on section and specification
Inconel 625Typically 30% or greater in annealed bar conditions
Hastelloy C-276Typically 40% or greater in solution-annealed wrought forms
Reference condition
Inconel 718Solution treated and precipitation hardened
Inconel 625Solution annealed; cold-worked conditions are also available
Hastelloy C-276Solution annealed
04

Temperature and corrosion

Temperature capability
Inconel 718Retains high mechanical strength in elevated-temperature service; commonly evaluated around applications up to approximately 700 C.
Inconel 625Broad cryogenic-to-elevated-temperature capability; the governing fastener specification and service environment set the allowable limit.
Hastelloy C-276Temperature suitability depends strongly on the process medium; selection is driven by corrosion conditions before a general thermal limit is assigned.
Corrosion characteristics
Inconel 718Good general corrosion and oxidation resistance, selected primarily where high strength and thermal stability are required together.
Inconel 625Strong resistance to seawater, chlorides and many industrial corrosive media, with useful oxidation resistance.
Hastelloy C-276Exceptional resistance to a wide range of oxidizing and reducing acids, chlorides, pitting and crevice attack.
Typical media and conditions
Inconel 718
  • Gas turbines and power systems
  • High-load elevated-temperature service
  • Energy and aerospace-adjacent equipment
Inconel 625
  • Seawater and marine environments
  • Chloride-bearing process media
  • Chemical and oil-and-gas service
Hastelloy C-276
  • Strong acids and mixed chemical media
  • Chloride-bearing process equipment
  • Sour and severe chemical service
05

Heat treatment

Typical heat treatment
Inconel 718Solution treatment followed by controlled two-step age hardening
Inconel 625Solution annealing when required by product form or specification
Hastelloy C-276Solution annealing; avoid unqualified post-process thermal exposure
Typical supply condition
Inconel 718Usually supplied solution treated and aged to the governing specification
Inconel 625Commonly annealed or solution treated; strength varies with cold work
Hastelloy C-276Commonly supplied in the solution-annealed condition
06

Typical applications

Material

Inconel 718

  • Gas turbines
  • Elevated-temperature bolting
  • Power generation
  • High-load industrial fasteners

Inconel 625

  • Marine and offshore equipment
  • Chemical processing
  • Pollution-control systems
  • Corrosion-resistant bolting

Hastelloy C-276

  • Chemical reactors and vessels
  • Acid-processing equipment
  • Waste and pollution-control systems
  • Severe chemical-service fasteners
07

Standards and documentation

Standards support
Inconel 718
  • ASTM B637
  • AMS 5662 / 5663 where applicable
  • Project-specific fastener specifications
Inconel 625
  • ASTM B446
  • ASTM F468 / F467
  • ASME and project specifications
Hastelloy C-276
  • ASTM B574
  • ASME material requirements
  • Order-specific fastener specifications
Documentation support
Inconel 718
  • MTC / MTR
  • Heat-treatment records
  • Mechanical test report
  • Hardness verification
  • Full heat and lot traceability
Inconel 625
  • MTC / MTR
  • EN 10204 3.1
  • PMI report
  • Mechanical test report
  • Traceability records
Hastelloy C-276
  • MTC / MTR
  • EN 10204 3.1
  • PMI report
  • Corrosion-test records when specified
  • Third-party inspection support
All compared alloys can be reviewed across BYBOLT standard and custom fastener ranges.View All Products
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The information shown is for preliminary material comparison only and does not replace project-specific engineering evaluation, the governing material standard or customer requirements.