Nauticalloy 22HS Nitronic 50 | UNS S20910

The marine shafts in Nauticalloy 22HS combine exceptional mechanical strength with superior corrosion resistance properties, making it a specification choice for demanding marine shaft applications where both high performance and long-term reliability are paramount

Engineered as a non-magnetic austenitic alloy steel, Nauticalloy 22HS delivers operational performance in the most challenging marine environments, from aggressive saltwater conditions to extreme mechanical loading scenarios encountered in modern propulsion systems

Hardened Steel

Material equivalents

Nauticalloy 22HS is a brandname for propeller shafts that are fully compatible with propeller shafts in Nitronic 50®, 1.3964, UNS S20910, and XM-19HS. This is internationally recognised, ensuring global compatibility and supply chain reliability across marine markets.

View Nauticalloy 22HS data sheet

Chemical composition

Element	C	Si	Mn	P	S	Cr	Ni	Mo	N
% min	-	-	4.00	-	-	20.50	11.50	1.50	0.20
% max	0.06	1.00	6.00	0.04	0.030	23.50	13.50	3.00	0.40

Chemical composition (% by weight)

Mechanical properties

Property	Rp0.2 (Proof Strength)	UTS (Tensile Strength)	Elongation A4 %	Reduction of Area %	Hardness BHN (max)
Metric (MPa / N/mm²)	>725 * MPa	825 - 1150 * MPa	15	45	<340
Imperial (ksi)	>105 * ksi	120 - 165 * ksi	15	45	<340

Material produced to ASTM A479 will have Rp0.2 >415Mpa and UTS >700Mpa

Characteristics

Enhanced corrosion resistance

Nauticalloy 22HS exhibits superior corrosion resistance performance compared to conventional marine grades including 1.4401-316 and 1.4404-316L stainless steels. The balanced chemical composition provides exceptional resistance to pitting, crevice corrosion and stress corrosion cracking in aggressive marine environments.

Non-magnetic characteristics

The austenitic microstructure ensures consistent non-magnetic properties, making this grade particularly suitable for applications requiring minimal magnetic permeability, such as submarines and precision marine instrumentation systems.

Exceptional strength-to-weight ratio

The optimised chemistry delivers outstanding mechanical properties whilst maintaining ductility and toughness characteristics essential for marine propeller shaft applications.

Marine applications and benefits

Nauticalloy 22HS is extensively specified for marine shafting, bolting and rigging applications, where its combination of high strength and corrosion resistance provides exceptional service life and reliability.

Applications extend to marine pumps, valves, masts, tie-downs, fixtures and fittings, where the material's properties ensure reliable performance under severe operating conditions.

Processing Quality Assurance Nauticalloy 4462 Nauticalloy 4542 Nauticalloy 4404 Nauticalloy 4501

For Nauticalloy 22HS technical consultation, contact our specialist technical sales team at +44 (0)1902 409409 or email sales@millstockstainless.com

Nauticalloy 22HS