Nauticalloy 4462 Duplex 2205 | 1.4462

Nauticalloy 4462 is the most extensively specified grade within the Nauticalloy product portfolio, the industry benchmark for duplex stainless steel marine applications. This duplex stainless steel features a controlled chemical composition, engineered to deliver dual-phase microstructure performance combining mechanical strength with corrosion resistance.

The optimised composition ensures operational performance in demanding marine environments, delivering enhanced strength and corrosion resistance that surpasses conventional austenitic grades whilst maintaining excellent fabrication characteristics.

New 1.4462

Material equivalents

Propeller shafts in 1.4462, UNS S31803/S32205, Duplex F51, or SAF 2205® are equivalent to Nauticalloy 4462. This is internationally recognised under multiple designation systems, ensuring global specification compatibility and supply chain reliability across diverse marine markets.

View Nauticalloy 4462 data sheet

Chemical composition

Element	C	Si	Mn	P	S	Cr	Ni	Mo	N
% min	-	-	-	-	-	21.00	4.50	2.50	0.10
% max	0.03	1.00	2.00	0.03	0.015	23	6.5	3.5	0.22

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)	>450 MPa	620 - 860 MPa	25	25	<290
Imperial (ksi)	>65 ksi	90 - 125 ksi	25	25	<290

Characteristics

Dual-phase microstructure benefits

Nauticalloy 4462 exhibits a balanced dual-phase microstructure comprising approximately 50% austenite and 50% ferrite phases. This metallurgical structure delivers significantly higher strength than conventional austenitic grades whilst maintaining excellent corrosion resistance and toughness.

Enhanced corrosion performance

The duplex microstructure provides exceptional resistance to localised corrosion phenomena including pitting, crevice corrosion and chloride-induced stress corrosion cracking. The material demonstrates excellent resistance to corrosive media including calcium, lithium and sodium chloride solutions commonly encountered in marine environments.

Superior strength-to-weight characteristics

The combination of austenitic and ferritic properties delivers improved mechanical performance compared to standard austenitic grades, enabling optimised shaft diameter specifications and reduced overall system weight.

Excellent fabrication properties

Despite enhanced strength, Nauticalloy 4462 maintains excellent weldability, formability and machinability properties essential for precision marine component manufacturing.

Marine applications and benefits

Nauticalloy 4462 finds extensive application in marine propeller shaft systems, where its combination of strength and corrosion resistance ensures reliable performance throughout extended service intervals in aggressive seawater environments.

The material's resistance to chloride stress corrosion cracking makes it particularly suitable for offshore platform equipment, subsea components and marine infrastructure subjected to continuous saltwater exposure.

Applications extend across oil and gas marine operations, chemical processing marine equipment and pulp and paper marine transport systems.

The duplex microstructure enables specification for demanding applications including marine pump shafts, valve components, bolting systems and structural elements requiring enhanced strength and corrosion resistance.

Processing Quality Assurance Nauticalloy 4462 Nauticalloy 4542 Nauticalloy 4404 Nauticalloy 4501

For Nauticalloy 4462 technical consultation, contact our specialist technical sales team at +44 (0)1902 409409 or email sales@millstockstainless.com

Nauticalloy 4462