AMS 6322 / AISI 8740 Aircraft Steel Bar

Buy AMS 6322 AISI 8740 aircraft steel bar at factory price. Aircraft-quality nickel-chromium-molybdenum low-alloy steel for aerospace fasteners, forgings, rings. 125 ksi tensile strength. ISO 9001 & AS 9120B certified. Fast delivery.

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AMS 6322 is a premium aerospace material specification defining aircraft-grade low-alloy steel products, including solid bars, precision forgings, flash-welded rings and dedicated forging stock. Corresponding to the widely recognized grade AISI 8740 (UNS G87400), this nickel-chromium-molybdenum low-alloy steel is engineered for high structural reliability, excellent hardenability and superior fatigue resistance, making it a staple material in commercial and military aerospace manufacturing.

As a professional China aircraft-grade alloy steel supplier,ZYTC Alloy provides fully AMS 6322 compliant AISI 8740 steel bars and forgings. We strictly follow aerospace metallurgical standards, precise heat treatment and dimensional tolerance control to deliver consistent, high-reliability raw materials for global aviation structural and power component production.

Chemical Composition

Element	Content (%)
Iron, Fe	96.595-97.72
Manganese, Mn	0.750-1.00
Nickel, Ni	0.400-0.700
Chromium, Cr	0.400-0.600
Carbon, C	0.380-0.430
Molybdenum, Mo	0.200-0.300
Silicon, Si	0.150-0.300
Sulfur, S	0.0400
Phosphorous, P	0.0350

Physical Properties

Properties	Metric	Imperial
Density	7.85 g/cm³	0.284 lb/in³

Mechanical Properties

Properties	Metric	Imperial
Tensile strength	695 MPa	101000 psi
Yield strength	415 MPa	60200 psi
Elastic modulus	190-210 GPa	27557-30458 ksi
Bulk modulus (typical for steel)	140 GPa	20300 ksi
Shear modulus (typical for steel)	80 GPa	11600 ksi
Poisson’s ratio	0.27-0.30	0.27-0.30
Elongation at break (50mm)	22.20%	22.20%
Izod Impact	41 J	30.2 ft.lb
Hardness, Brinell	201	201
Hardness, Knoop (converted from Brinell hardness)	223	223
Hardness, Rockwell B (converted from Brinell hardness)	93	93
Hardness, Rockwell B (converted from Brinell hardness, value below normal HRC range, for comparison only)	13	13
Hardness, Vickers (converted from Brinell hardness)	211	211
Machinability (hot rolled and cold drawn, based on 100 machinability for AISI 1212 steel)	65	65

Thermal Properties

The thermal properties of AISI 8740 alloy steel are highlighted below.

Properties	Metric	Imperial
Thermal conductivity	46.6 W/mK	323 BTU in/hr.ft².°F

Aerospace & Industrial Applications

Thanks to its outstanding hardenability, fatigue resistance and high structural stability, AMS 6322 8740 steel is widely used in high-reliability aircraft and high-end industrial components:

Aerospace structural parts: Aircraft frame components, high-load structural supports and connecting parts
Aviation power system components: Engine accessory parts, transmission shafts and precision forgings
Mechanical transmission parts: High-strength gears, bolts, fasteners and wear-resistant moving components
High-end industrial equipment: Heavy-load mechanical parts requiring high toughness and fatigue resistance

Available Product Forms

ZYTC Alloy supports diversified product supply and customized processing of AMS 6322 AISI 8740 steel:

Steel round bars, flat bars, precision forgings, flash-welded rings and custom forging stock. We provide standard-size spot inventory and non-standard size cutting, meeting one-stop procurement needs for aerospace and industrial manufacturers.

Contact ZYTC Alloy for certified AMS 6322 AISI 8740 aerospace steel, customized sizes and factory-direct competitive quotations.

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