We are a professional manufacturer of ASTM A193 Grade B8R UNS S20910 /XM-19 / nitronic® 50 STUD BOLTS in China
ASTM A193 Grade B8R is a standard material specification for high strength, corrosion resistant UNS S20910 / XM-19 / Nitronic 50 stainless steel fasteners such as bolts, screws, studs, threaded rods and other externally threaded parts, for use in high tensile, high temperature and special purpose applications.
ASTM A193 Gr.B8R also known as Nitronic 50 is a chromium-nickel-manganese-molybdenum austenitic stainless steel that remains completely
NITRONIC ® 50 / UNS S20910 / XM-19 is manganese alloyed austenitic stainless steel with improved corrosion resistance compared to 316L and 317L due to increased chromium content plus about twice the yield strength of the same at room temperature. Unlike many austenitic alloys, NITRONIC ® 50 does not become magnetic when cold formed. NITRONIC ® 50 Stainless has very good mechanical properties at both elevated and sub-zero temperatures.
XM-19 is a nitrogen-strengthened austenitic stainless steel with excellent corrosion resistance. In comparison with Type 316L, XM-19 provides higher corrosion resistance and higher strength
NITRONIC ® 50 / UNS S20910 / XM-19 Chemical composition
| Weight % | C | Si | Mn | S | P | Cr | Ni | Mo | Nb | V | N |
| Min. | 4,00 | 20,50 | 11,50 | 1,50 | 0,10 | 0,10 | 0,20 | ||||
| Max. | 0,06 | 1,00 | 6,00 | 0,030 | 0,040 | 23,50 | 13,50 | 3,00 | 0,30 | 0,30 | 0,40 |
Product Standards: ASTM A276, ASTM A479
Approvals: NACE MR0175
NITRONIC ® 50 / UNS S20910 / XM-19 Mechanical Properties
| Yield strength Rp0.2, MPa | Tensile strength Rm, MPa | Elongation [%] | Hardness [HB] | Impact, Charpy-V, 20ºC [J] | |
| BAR | ≥ 345 | ≥ 655 | ≥ 35 | ≤ 293 | 230 |
| Typical | 420 | 730 | 50 | 201 | |
| High strength version* | ≥ 586 | ≥ 896 | ≥ 20 | ≤ 330 |