The specification of ASTM A193 grade B16 includes details of high tensile, stainless, or alloy steel fasteners. It is extensively used in high-pressure and high-temperature services like valves, fittings, pressure valves, flanges,
and chemical and petroleum construction applications.
The grades that are present under A193 are below.
A193 Grades
| B16 |
Alloy steel, AISI 4340 quenched and tempered |
Mechanical properties
| Grade |
Size |
Tensile ksi, min |
Yield ksi, min |
Elong %, min |
RA % min |
HBW |
Rockwell |
| B16 |
Up to 2-1/2 |
125 |
105 |
18 |
50 |
321 Max |
35 HRC max |
| Over 2-1/2 to 4 |
110 |
95 |
17 |
45 |
| Over 4 to 8 |
100 |
85 |
16 |
45 |
Chemical properties
| Element |
B16 |
| Carbon |
0.36 - 0.47% |
| Manganese |
0.45 - 0.70& |
| Phosphorus, max |
0.035% |
| Sulfur, max |
0.040% |
| Silicon |
0.15 - 0.35% |
| Chromium |
0.80 - 1.15 |
| Vanadium |
0.25 - 0.35% |
| Molybdenum |
0.50 - 0.65 |
Compatible hardware
| Bolt Grade |
Nut |
Washers |
| B16 |
A194 Grade 4 |
F436 |
