0.09C 5.1Cr-1.8Mo-9.8Ni Low Alloy Steel

metal

This is a low-alloy, high-nickel steel engineered for high-strength applications requiring excellent toughness and fatigue resistance. The composition—featuring ~5% chromium, ~10% nickel, and ~2% molybdenum with minimal carbon—produces a martensitic or martensitic-austenitic microstructure optimized for demanding aerospace, defense, and power generation environments where both strength and damage tolerance are critical. This alloy family is valued over conventional martensitic stainless steels or lower-alloy alternatives because the nickel content enhances ductility and fracture toughness, while the Mo-Cr combination provides corrosion resistance and secondary hardening, making it suitable for high-cycle fatigue and cryogenic service.

aerospace fasteners and landing gearpressure vessels and thick sectionsgun barrels and ordnancecryogenic equipment and low-temperature servicehigh-strength structural forgingspower plant bolting and rotors

Compliance & Regulations

?ISO 10993?Conflict Free?RoHS?REACH?TSCA?Prop 65

Units:

si imperial

Property	Value	Unit	Conditions	Source
Elongation at Break(εf)	—	-	—	—
Ultimate Tensile Strength(σUTS)	—	Pa	—	—
Yield Strength (0.2% offset)(σy)	—	Pa	—	—

Verified Unverified Low confidence (<80%) Link to source

Regulatory Screening

Environmental

Safety & Biocompatibility

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.