alloyfyi

Python API client and CLI for metal alloys, compositions, and mechanical properties. Access 765 alloys across 12 families — including stainless steels, aluminum alloys, titanium grades, nickel superalloys, and high-entropy alloys — with tensile strength, yield strength, density, hardness, and application data. Zero dependencies.

Extracted from AlloyFYI, a metallurgy reference platform with 49 glossary terms, 72 educational guides, and comparison tools for engineers, materials scientists, and developers working with metal alloy selection and specification.

Explore alloys at alloyfyi.com — browse the alloy database, compare alloy families, and read the metallurgy glossary.

Table of Contents

• Install
• Quick Start
• What You Can Do
  • Alloy Families & Classification
  • Mechanical Properties
  • Industrial Applications
  • Alloy Comparisons
• Command-Line Interface
• MCP Server (Claude, Cursor, Windsurf)
• REST API Client
• API Reference
• Learn More About Alloys
• Also Available
• Science FYI Family
• FYIPedia Developer Tools
• License

Install

pip install alloyfyi                # Core (zero deps)
pip install "alloyfyi[cli]"         # + Command-line interface (typer, rich)
pip install "alloyfyi[mcp]"         # + MCP server for AI assistants
pip install "alloyfyi[api]"         # + HTTP client for alloyfyi.com API
pip install "alloyfyi[all]"         # Everything

Or run instantly without installing:

uvx --from alloyfyi alloyfyi search stainless

Quick Start

from alloyfyi.api import AlloyFYI

with AlloyFYI() as api:
    # Browse 765 alloys across 12 families
    alloys = api.list_alloys(limit=10)
    print(alloys["count"])  # 765 total alloys

    # Explore alloy families — steel, aluminum, titanium, nickel, copper
    families = api.list_families()
    for family in families["results"]:
        print(family["slug"])

    # Search for specific alloy types or compositions
    results = api.search("stainless steel")
    print(results["count"])

What You Can Do

Alloy Families & Classification

Metal alloys are classified into 12 families based on their base metal and processing characteristics. Each family serves distinct engineering roles determined by mechanical properties, corrosion resistance, and cost.

Family	Description	Typical Use
Stainless Steel	Fe-Cr alloys (>10.5% Cr) with corrosion resistance	Medical instruments, food processing, architecture
Carbon Steel	Fe-C alloys (0.05-2.0% C), most produced metal	Construction, automotive frames, pipelines
Alloy Steel	Fe + Cr, Mo, V, Ni for enhanced properties	Gears, shafts, pressure vessels
Tool Steel	High-hardness Fe alloys (W, Mo, V, Co)	Cutting tools, dies, molds
Structural Steel	Low-carbon steel for construction loads	Bridges, buildings, infrastructure
Spring Steel	High yield strength, elastic deformation	Automotive springs, industrial mechanisms
Bearing Steel	High-carbon chromium steel, fatigue resistant	Ball bearings, roller bearings
Aluminum Alloy	Al-base with Cu, Mg, Si, Zn additions	Aerospace, automotive, packaging
Titanium Alloy	Ti-base with Al, V, Mo for strength-to-weight	Aerospace, biomedical implants, marine
Nickel Alloy	Ni-base superalloys for extreme temperatures	Jet engines, gas turbines, chemical processing
Copper Alloy	Cu-base (brass, bronze, cupronickel)	Electrical wiring, plumbing, marine hardware
High-Entropy Alloy	5+ principal elements in near-equal proportions	Research, next-generation aerospace, nuclear

from alloyfyi.api import AlloyFYI

with AlloyFYI() as api:
    # List all 12 alloy families
    families = api.list_families()
    for f in families["results"]:
        print(f["slug"])  # stainless-steel, carbon-steel, aluminum-alloy, ...

    # Get family details with member alloys
    stainless = api.get_family("stainless-steel")
    print(stainless)

Learn more: Alloy Families · Metallurgy Glossary · Alloy Guides

Mechanical Properties

Each alloy in the database includes key mechanical and physical properties used in engineering material selection. Properties follow international testing standards (ASTM, ISO).

Property	Unit	What It Measures
Tensile Strength	MPa	Maximum stress before fracture
Yield Strength	MPa	Stress at onset of plastic deformation
Density	g/cm3	Mass per unit volume
Hardness (Brinell)	HB	Resistance to indentation
Melting Point	C	Solid-to-liquid transition temperature

Additionally, each alloy carries 6-point rating scores (1-10) for quick comparison:

Rating	Meaning
Strength	Overall mechanical strength
Corrosion	Resistance to oxidation and chemical attack
Weight	Inverse of density (higher = lighter)
Machinability	Ease of cutting, drilling, and forming
Cost	Economic value (higher = more affordable)
Temperature	Performance at elevated temperatures

from alloyfyi.api import AlloyFYI

with AlloyFYI() as api:
    # Access mechanical properties for any of 765 alloys
    alloy = api.list_alloys(limit=1)
    detail = alloy["results"][0]
    print(detail.get("yield_strength_mpa"))   # e.g., 770.0
    print(detail.get("density_g_cm3"))        # e.g., 6.400
    print(detail.get("rating_strength"))      # e.g., 5
    print(detail.get("rating_corrosion"))     # e.g., 5

Learn more: Alloy Database · Alloy Guides

Industrial Applications

AlloyFYI catalogs 30 industrial applications linking alloy families to real-world engineering use cases — from aerospace turbine blades to surgical implants. Each application describes requirements, common alloy choices, and performance criteria.

from alloyfyi.api import AlloyFYI

with AlloyFYI() as api:
    # Browse 30 application areas
    apps = api.list_applications()
    for app in apps["results"]:
        print(app["slug"])

    # Get application detail with recommended alloys
    detail = api.get_application("aerospace")

Learn more: Applications · Metallurgy Glossary

Alloy Comparisons

Compare two alloys side-by-side across all mechanical properties and rating scores. Pre-computed comparisons highlight the differences in strength, weight, corrosion resistance, and cost for common alloy pairs.

from alloyfyi.api import AlloyFYI

with AlloyFYI() as api:
    # Browse pre-computed alloy comparisons
    comparisons = api.list_comparisons(limit=5)
    for comp in comparisons["results"]:
        print(comp["slug"])

Learn more: Alloy Comparisons · Alloy Guides

Command-Line Interface

pip install "alloyfyi[cli]"

alloyfyi search stainless            # Search alloys, families, applications
alloyfyi search "titanium grade 5"   # Search by grade name
alloyfyi search aerospace            # Search applications

MCP Server (Claude, Cursor, Windsurf)

Add alloy lookup tools to any AI assistant that supports Model Context Protocol.

pip install "alloyfyi[mcp]"

Add to your claude_desktop_config.json:

{
    "mcpServers": {
        "alloyfyi": {
            "command": "uvx",
            "args": ["--from", "alloyfyi[mcp]", "python", "-m", "alloyfyi.mcp_server"]
        }
    }
}

REST API Client

pip install "alloyfyi[api]"

from alloyfyi.api import AlloyFYI

with AlloyFYI() as api:
    alloys = api.list_alloys()             # GET /api/v1/alloys/
    families = api.list_families()         # GET /api/v1/families/
    apps = api.list_applications()         # GET /api/v1/applications/
    comparisons = api.list_comparisons()   # GET /api/v1/comparisons/
    results = api.search("titanium")       # GET /api/v1/search/?q=titanium

Example

curl -s "https://alloyfyi.com/api/v1/families/" | python3 -m json.tool

{
  "count": 12,
  "results": [
    {"slug": "stainless-steel"},
    {"slug": "carbon-steel"},
    {"slug": "aluminum-alloy"},
    {"slug": "titanium-alloy"},
    {"slug": "nickel-alloy"},
    {"slug": "copper-alloy"},
    {"slug": "high-entropy-alloy"}
  ]
}

Full API documentation at alloyfyi.com/developers/.

API Reference

Method	Description
list_alloys(**params)	List all 765 alloys with pagination
get_alloy(slug)	Get alloy detail with properties and ratings
list_families(**params)	List all 12 alloy families
get_family(slug)	Get family detail with member alloys
list_applications(**params)	List 30 industrial applications
get_application(slug)	Get application detail
list_alloy_applications(**params)	List alloy-application links
get_alloy_application(slug)	Get alloy-application detail
list_comparisons(**params)	List alloy comparisons
get_comparison(slug)	Get side-by-side comparison
list_glossary(**params)	List 49 metallurgy glossary terms
get_term(slug)	Get glossary term definition
list_guides(**params)	List 72 educational guides
get_guide(slug)	Get guide content
search(query)	Search across all alloy content

Learn More About Alloys

• Browse: Alloy Database · Alloy Families · Applications
• Compare: Alloy Comparisons
• Reference: Metallurgy Glossary
• Guides: Educational Guides
• API: REST API Docs · OpenAPI Spec

Also Available

Platform	Install	Link
npm	npm install alloyfyi	npm
MCP	uvx --from "alloyfyi[mcp]" python -m alloyfyi.mcp_server	Config

Science FYI Family

Part of the FYIPedia open-source developer tools ecosystem — physical sciences, chemistry, geology, astronomy, and materials.

Package	PyPI	npm	Description
chemfyi	PyPI	npm	Periodic table, 500 compounds, 371 reactions — chemfyi.com
alloyfyi	PyPI	npm	765 metal alloys, 12 families, compositions — alloyfyi.com
gemfyi	PyPI	npm	442 gemstones, Mohs scale, grading — gemfyi.com
starfyi	PyPI	npm	119,602 stars, 6,128 exoplanets, 13,305 deep-sky objects — starfyi.com
mineralfyi	PyPI	npm	6,215 minerals, 7 crystal systems — mineralfyi.com

FYIPedia Developer Tools

Package	PyPI	npm	Description
colorfyi	PyPI	npm	Color conversion, WCAG contrast, harmonies — colorfyi.com
emojifyi	PyPI	npm	Emoji encoding & metadata for 3,953 emojis — emojifyi.com
symbolfyi	PyPI	npm	Symbol encoding in 11 formats — symbolfyi.com
unicodefyi	PyPI	npm	Unicode lookup with 17 encodings — unicodefyi.com
fontfyi	PyPI	npm	Google Fonts metadata & CSS — fontfyi.com
distancefyi	PyPI	npm	Haversine distance & travel times — distancefyi.com
timefyi	PyPI	npm	Timezone ops & business hours — timefyi.com
namefyi	PyPI	npm	Korean romanization & Five Elements — namefyi.com
unitfyi	PyPI	npm	Unit conversion, 220 units — unitfyi.com
holidayfyi	PyPI	npm	Holiday dates & Easter calculation — holidayfyi.com
cocktailfyi	PyPI	—	Cocktail ABV, calories, flavor — cocktailfyi.com
fyipedia	PyPI	—	Unified CLI: fyi alloy info stainless-steel — fyipedia.com
fyipedia-mcp	PyPI	—	Unified MCP hub for AI assistants — fyipedia.com

License

MIT