NITRONIC® 50HS (XM-19) (UNS S20910)
Cr 22, Ni 12.5, Mn 5, Mo 2.25, Si 1 C 0.06 Fe bal.
High Performance Alloys stocks and produces this grade in the following forms: Bar, wire, sheet, plate, coil, fasteners and forgings. Request quote on this grade. Call our sales department for information on sizes and strengths stocked.
Austenitic Stainless
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.
High Performance Alloys can make hot rolled, cold worked, & strain hardened High Performance Stainless Steel (HPSS) bars in house. Ask for our GFM Bulletin for more information about our bar processing capabilities. We have expanded to enhance product availability. Bars are stocked and manufactured according to Cond. S or Cond H high strength properties, we also makea full line of materials in high strength bar, sheet and plates according to your specification.
High Strength (HS) Bar Properties
NITRONIC 50 stainless bars also are available in a high-strength condition attained by special processing techniques. Because its high strength is produced by mill processing, hot forging or welding operations cannot be performed on this material without loss of strength. High-strength bars produced by rotary forging-special practice may have somewhat reduced resistance to corrosion and sulfide stress cracking not exhibited by strain hardened materials. This is primarily due to the hot worked material becoming sensitized during processing.
Outstanding corrosion resistance gives Armco's NITRONIC 50 Stainless Steel the leading edge for applications where Types 316. 316L, 317 and 317L are only marginal. It's an effective alloy for the petroleum, petrochemical, chemical, fertilizer, nuclear fuel recycling, pulp and paper, textile, food processing and marine industries.
Chemical Requirements |
|||||||
|---|---|---|---|---|---|---|---|
|
Ni |
Cr |
Mo |
Mn |
C |
Si |
Fe |
Max |
13.5 |
23.5 |
3.00 |
6.0 |
0.06 |
1.00 |
Bal |
Min |
11.5 |
20.5 |
1.50 |
4.0 |
|
|
|
UNSS20910 |
|
|---|---|
Bar |
ASTM A193 ASTM A194 ASTM A276 ASTM A479 AMS 5764 |
Wire |
|
| Sheet |
ASTM A240 AMS 5861 |
| Plate |
ASTM A240 AMS 5861 |
Fitting |
|
Forging |
ASTM A193 ASTM A 194 ASTM A276 ASTM A479 AMS 5764 |
Weld Wire |
A5.9 ER209 |
Weld Electrode |
|
Din |
1.4565 |
Annealing Temperature
NITRONIC 50 Stainless Steel can be supplied annealed at 1950 F to 2050 F (1066 C to 1121 C). For most applications, the 1950 F (1066 C) condition should be selected, as it provides a higher level of mechanical properties along with excellent corrosion resistance. When as-welded material is to be used in strongly corrosive media, the 2050 F (1121 C) condition should be specified in order to minimize the possibility of intergranular attack. High strength bars should be annealed by the mill before their final hot working, or cold working for optimum corrosion resistance. All high strength bars, sheets and plates are supplied in their final condition, and do not require further heat treating.
Corrosion Properties
Armco NITRONIC 50 Stainless Steel provides outstanding corrosion resistance - superior to Types 316, 316L, 317 and 317L in many media. For many applications the 1950 F (1066 C) annealed condition provides adequate corrosion resistance and a higher strength level. In very corrosive media or where material is to be used in the as-welded condition, the 2050 F (1121 C) annealed condition should be specified. High-Strength (HS) NITRONIC 50 bars are useful for applications such as shafting and bolting, but do not quite exhibit the corrosion resistance of the annealed conditions in all environments.
Intergranular Attack
The resistance to intergranular attack is excellent even when sensitized at 1250 F (675 C) for one hour to simulate the heat-affected zone of heavy weldments. Material annealed at 1950 F (1066 C) has very good resistance to intergranular attack for most applications. However, when thick sections are used in the as-welded condition in certain strongly corrosive media, the 2050 F (1121 C) condition gives optimum corrosion resistance.
Stress-Corrosion Cracking Resistance
In common with most stainless steels, under certain conditions, Armco NITRONIC 50 Stainless Steel may stress-corrosion crack in hot chloride environments. When tested in boiling 420/0 MgCI2 solution, a very accelerated test, NITRONIC 50 Stainless Steel is between types 304 and 316 stainless steels in resistance to cracking. There is little difference in susceptibility to cracking whether in the annealed, high-strength (HS), or cold-drawn conditions.
Sulfide Stress Cracking
Both laboratory tests and field service experience have shown that Armco NITRONIC 50 stainless has excellent resistance to sulfide stress cracking in air conditions. NITRONIC 50 in both the annealed and high-strength (hot rolled) conditions has been included in the 1996 revision of NACE Standard MR-01 -75' "Sulfide Stress Cracking Resistant Metallic Material for Oil Field Equipment," at hardness levels up to RC 35 maximum. The resistance to cracking in laboratory tests in synthetic sour-well solution(5% NaCI + ½% acetic acid. saturated with H2S)
NITRONIC is a registered tradename of Armco, Inc.
Material in this bulletin has been reprinted from Armco Bulletin No S-45, other Armco sources, and HPA data.
