SRM 661
Alloy Steel
wdx 
edx
thin film 
thin foil
xrf
edx
thin film
thin foil
xrf
Source
NIST
Form
Rod
Notes
AISI 4340
| Element | WT% |
| Pb | 0.000025% |
| Nd | 0.0003% |
| Bi | 0.0004% |
| La | 0.0004% |
| Ag | 0.0004% |
| Te | 0.0006% |
| Ce | 0.0013% |
| Se | 0.004% |
| Sb | 0.0042% |
| Zr | 0.009% |
| Sn | 0.011% |
| V | 0.011% |
| P | 0.015% |
| S | 0.015% |
| As | 0.017% |
| W | 0.017% |
| Ta | 0.02% |
| Ti | 0.02% |
| Al | 0.021% |
| Nb | 0.022% |
| Co | 0.032% |
| Cu | 0.042% |
| Mo | 0.19% |
| Si | 0.223% |
| C | 0.392% |
| Mn | 0.66% |
| Cr | 0.69% |
| Ni | 1.99% |
| Fe | 95.59138% |
| Compound | WT% |
