High Strength And Good Corrosion Resistant Nitronic 50 Alloy Bar
1 . Description
NITRONIC 50 Stainless Steel provides a combination of corrosion resistance and strength not found in any other commercial material available in its price range. This austenitic stainless has corrosion resistance greater than that provided by Types 316 and 316L, plus approximately twice the yield strength at room temperature. In addition, Armco NITRONIC 50 Stainless has very good mechanical properties at both elevated and sub-zero temperatures. And, unlike many austenitic stainless steels, NITRONIC 50 does not become magnetic when cold worked
2.High Strength (HS) Bar Properties
NITRONIC 50 stainless bars also are available in a high-strength condition attained by special processing techniques. The superior strength of NITRONIC 50 HS produced by hot-rolling is size dependent, approaching that of annealed bars with sizes over 3” diameter. Because its high strength is produced by mill processing, welding operations cannot be performed on this material without loss of strength. Highstrength bars produced by rotary forgingspecial practice may have somewhat reduced resistance to corrosion and sulfide stress cracking.
3 . Chemical Composition:
| Grade | ％ | Ni | Cr | Fe | C | Mn | Si | N | Mo | Nb | V | P | S |
| XM-19 | Min | 11.5 | 20.5 | 52 | 4 | 0.2 | 1.5 | 0.1 | 0.1 | ||||
| Max | 13.5 | 23.5 | 62 | 0.06 | 6 | 1 | 0.4 | 3 | 0.3 | 0.3 | 0.04 | 0.03 |
4 . Alloy miniumum mechanical properties in the room temperature:
| Grade | Tensile Strength (Mpa) | Yield Strength (Mpa) | Elongation (％) | Hardness HB |
| XM-19 | 690 | 380 | 35 | ≤241 |
5 . Heavy Section Weld Joint Properties
The mechanical properties of welds in 1-1/4" (32.1 mm) thick plate have been determined using two weld processes that are normally employed in heavy section welding, namely, (a) shielded metal arc (SMA) or stick electrode welding and (b) gas metal arc (GMA) or MIG welding with the spray mode. Heat input is important in obtaining the most satisfactory weld joint. Narrow stringer beads rather that a wide "weave" technique should be used for highest weld ductility. Good shielding of the molten puddle is important to eliminate additional nitrogen from the atmosphere that could cause porosity. Both stringer beads and adequate shielding are normal factors in good stainless steel welding practice.
