XM-19 (S20910)

What is XM-19 and its applications?

XM-19 (UNS S20910), commonly known as Nitronic 50, is a nitrogen-strengthened austenitic stainless steel. It is used in marine pumps, valves, chemical-process equipment and oilfield components requiring strength and corrosion resistance.

Marine systems: Pump and valve components.
Chemical processing: Vessels, piping and fluid-handling components.
Oil and gas equipment: Production and downhole components selected for defined conditions.

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Engineering Application & Selection Guide

Nitrogen contributes solid-solution strengthening while the alloy retains low magnetic permeability. Supplied condition matters: annealed and high-strength processed material should not be assigned the same mechanical values.

XM-19 hex bolts — For pump and valve connections, distinguish the bolted joint from shafts or other components made from the alloy.
XM-19 stud bolts — For subsea flanges, check the final condition, loads and any applicable sour-service limits.
XM-19 hex nuts — For structural nuts, match load capacity and thread tolerance to the bolt, and agree a compatible installation procedure.

Compare XM-19 and Duplex 2205 on condition, corrosion and magnetic requirements. Low permeability should be specified and measured where critical. XM-19 can still suffer stress-corrosion cracking in hot chloride environments.

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XM-19 Composition

Composition limits · wt.%

ElementWeight %

Cr: 20.5–23.5%
Ni: 11.5–13.5%
Mn: 4–6%
Mo: 1.5–3.0%
N: 0.20–0.40%
Nb: 0.10–0.30%
V: 0.10–0.30%
C: ≤0.06%
P: ≤0.045%
S: ≤0.035%
Si: ≤1.0%

ASTM / ASME specifications by product form

Finished-product requirements

Specify the finished-fastener mechanical requirements, condition and inspection separately from the starting-stock specification.

XM-19 hex bolt requirements ↗

Fasteners · dimensional references

Product	Reference
Hex bolts	ISO 4014 / ISO 4017 · ASME B18.2.1
Threaded studs	DIN 976-1 · ASME B18.31.2
Hex nuts	ISO 4032 · ASME B18.2.2
Socket head screws	ISO 4762 · ASME B18.3
Flat washers	ISO 7089 / ISO 7090 · ASME B18.21.1
Custom fasteners	Customer drawing

Raw-material specifications

Product form / scope	Reference
Bar & shapes · Specify grade, condition and order requirements.	ASTM A276
Plate, sheet & strip	ASTM A240 / ASME SA240

Dimensions do not define material or finished-part compliance. Specify the grade, condition and applicable requirements.

How to specify round bar, plate, wire and strip ↗

XM-19 Mechanical Properties

Reference sample and condition

Data basis: Catalogue reference minimums
Condition: Annealed
Gauge length: A5, as labelled in supplied table

Key properties	Value
Tensile strength	≥690 MPa
0.2% yield strength	≥380 MPa
Elongation	≥35%

Supplied technical reference · Scanned PDF page 2 · printed page 14

Procurement and application guide

Specify the material and final condition

Annealed and high-strength worked conditions have different properties.

Material forms in the technical reference: Bar · Billet · Plate · Sheet · Strip.

Define the finished-part acceptance

Include the material or bolting specification, required final condition, dimensions and quantity. State the service medium, temperature and loading where known. Agree the required tests, inspection coverage and acceptance criteria for the finished part.

Start with the information you have

Send a drawing or share the product form and dimensions. Identify any undecided requirements for review rather than copying a typical property value into the purchase order.

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