300M Alloy Steel
metalUNS K44220· AISI 300M· 300M· AMS 6257
300M is a chromium-molybdenum-vanadium alloy steel (AISI 4340-type) used in high-strength aerospace applications including landing gear, fasteners, and structural components, offering tensile strengths of 1650–1900 MPa with excellent fatigue resistance and fracture toughness when properly heat-treated.
Compliance & Regulations
?Conflict Free?RoHS?REACH?TSCA?Prop 65
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| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Fatigue Crack Growth Rate(da/dN)3 entries | Curve (23 pts) | m/cycle | 21°C | — | |
| ↳ | Curve (6 pts) | m/cycle | 21°C | — | |
| ↳ | Curve (61 pts) | m/cycle | 21°C | — | |
S–N Curve (Wöhler)(S–N) | — | ksi | 28 entriesClick to expand | ||
N entriesMultiple entries per property — large groups are collapsed; click a summary row to expand. Use filters above to narrow by form / heat treatment / basis.
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Regulatory Screening
Environmental
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RoHS, REACH, and Prop 65 statuses are validated against official substance lists (ECHA SVHC Candidate List, OEHHA Prop 65, RoHS Annex II). Other regulations are estimated from composition and material classification. All screening is a starting point for due diligence — always verify with your supplier before making compliance decisions.