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Hexaferrum and epsilon iron (ε-Fe) are synonyms for the hexagonal close-packed (HCP) phase of iron that is stable only at extremely high pressure. A 1964 study at the University of Rochester mixed 99.8% pure α-iron powder with sodium chloride , and pressed a 0.5-mm diameter pellet between the flat faces of two diamond anvils.
The [α/Fe] versus [Fe/H] diagram is a type of graph commonly used in stellar and galactic astrophysics. It shows the logarithmic ratio number densities of diagnostic elements in stellar atmospheres compared to the solar value. The x-axis represents the abundance of iron (Fe) vs. hydrogen (H), that is, [Fe/H].
The first 3 digits often match older 3-digit numbering systems, while the last 2 digits indicate more modern variations. For example, Stainless Steel Type 310 in the original 3-digit system became S31000 in the UNS System. The more modern low-carbon variation, Type 310S, became S31008 in the UNS System.
The 15T scale employs a 15-kgf load on a 1 ⁄ 16-inch-diameter (1.588 mm) hardened steel ball, and can be used on sheet metal. The B and C scales overlap, such that readings below HRC 20 and those above HRB 100, generally considered unreliable, need not be taken or specified.
Like the U.S. Navy, the U.S. Coast Guard authorizes gold and red service stripes, however the color in the case of the latter does not depend on time in service, but rather on rank: Junior enlisted personnel (i.e. those in paygrades E-1 to E-6) wear red service stripes, whereas chief petty officers (i.e. those in paygrades E-7 to E-9) wear gold ...
File:Diagramma_di_fase_del_ferro_puro.svg licensed with Cc-by-sa-3.0, GFDL 2010-09-11T13:37:42Z Daniele Pugliesi 470x450 (23026 Bytes) piccole correzioni sui valori 2010-09-11T11:59:22Z Daniele Pugliesi 470x450 (23026 Bytes) Correggo errore: si parla di ferrite solo se è presente carbonio, questo diagramma si riferisce invece al ferro puro.
This page shows the electron configurations of the neutral gaseous atoms in their ground states. For each atom the subshells are given first in concise form, then with all subshells written out, followed by the number of electrons per shell.
Brinell hardness numbers Material Hardness Softwood (e.g., pine) 1.6 HBS 10/100 Hardwood: 2.6–7.0 HBS 10/100 Lead: 5.0 HB (pure lead; alloyed lead typically can range from 5.0 HB to values in excess of 22.0 HB) Pure Aluminium: 15 HB Copper: 35 HB Hardened AW-6060 Aluminium: 75 HB Mild steel: 120 HB 18–8 (304) stainless steel annealed: 200 ...