300M Alloy Steel

metal

UNS 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.

structuralgeneral engineering

Compliance & Regulations

?Conflict Free?RoHS?REACH?TSCA?Prop 65

Units:

si imperial

31 interactive curves for this material

Stress-strain, S-N fatigue and environmental knockdown curves are free with an account.

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Property	Value	Unit	Conditions
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, or test environment.

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Regulatory Screening

Environmental

Quality & Standards

Industry-Specific

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.

300M Alloy Steel

Mechanical Properties

Regulatory Screening

Environmental

Quality & Standards

Industry-Specific