MATERIAL DESCRIPTION

NITRONIC® 50 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.

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

APPLICATIONS

The combination of corrosion resistance and mechanical strength is utilized in marine hardware, pump shafting, petrochemical, pulp & paper, food processing and petroleum industries. Can also be used in “down hole” applications due to sulfide stress cracking resistance.
Field service experience have shown that 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 NACE Standard MR01-75/ ISO 15156-3 “Sulfide Stress Cracking Resistant Metallic Material for Oil Field Equipment,” at hardness levels up to HRc 35 maximum.

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

Heat Treatment

Annealed, for most applications, the 1066°C condition should be selected, as it provides a higher level of mechanical properties along with excellent corrosion resistance. A high strength version can also be supplied with min. yield at 585MPa.

UNS S20910 / NITRONIC® 50 ROUND BAR

DESCRIPTION KG/M
25,4 mm 4.4
36 mm 8.
38,1 mm 9.2
45 mm 12.8
76,2 mm 36.8
101,6 mm 65.1
140 mm 123.5