This 4340 Low Alloy Steel Certified Reference Material is intended for instrument calibration, method validation, and quality control in laboratories performing elemental analysis on high-strength alloy steels. The chemistry aligns with UNS G43400–type alloys commonly used in aerospace, defense, power generation, heavy machinery, and high-stress mechanical applications.

This CRM is available in multiple physical formats, each optimized for a specific analytical technique to ensure proper excitation conditions, homogeneity, and repeatability.

Certified Chemical Composition (wt.%)

Element	Certified Value	Uncertainty
C	0.42	±0.02
Mn	0.658	±0.009
Cr	0.81	±0.03
Ni	1.85	±0.03
Mo	0.235	±0.009
Si	0.283	±0.009
Cu	0.170	±0.006
Al	0.022	±0.002
P	0.0078	±0.0009
S	0.016	±0.002
N	0.0060	±0.0009
Co	0.014	±0.002
Sn	0.008	±0.001
Ti	0.0019	±0.0006
V	0.0033	±0.0008
O	0.0009	±0.0003
Fe	Balance	—

Common & Equivalent Alloy Designations

AISI 4340, SAE 4340, UNS G43400, ASTM A29 4340, ASTM A322 4340, ASTM A331 4340, AMS 6340, AMS 6350, AMS 6414, AMS 6415, EN 10083-3 34CrNiMo6, DIN 1.6582, DIN 34CrNiMo6, ISO 683-1 34CrNiMo6, JIS SNCM439, JIS SNCM430, GB/T 3077 34CrNiMo6, BS 970 817M40, AFNOR 35NCD6, NF EN 10083-3 34CrNiMo6

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