ThePipingMart Blog Grades AMS 6345 Alloy Steel – Composition, Properties, and Uses

AMS 6345 Alloy Steel – Composition, Properties, and Uses

AMS 6345

If you’re in the manufacturing industry, especially in producing aircraft parts, you might have heard of SAE – AMS 6345. It is an alloy steel grade highly valued for its exceptional characteristics, such as durability, strength, and resistance to wear and tear. It is also an inexpensive alternative to other expensive alloy steel grades. This blog post will look closer at AMS6345 and explore its various properties, uses, and benefits.

What is AMS 6345?

SAE – AMS 6345 (also known as SAE – AISI 4130 Alloy Steel) is a type of metal that offers an array of benefits for various industries. This alloy steel is known for its exceptional toughness, making it perfect for high-stress applications such as aerospace and defense. AMS 6345 steel metal is highly resistant to wear and tear, which makes it a go-to material for heavy-duty machinery and equipment. Additionally, it boasts excellent machinability and weldability, making it highly versatile for various applications. With its impressive properties and reliability, it’s no surprise that AMS 6345 material is highly sought after for mission-critical operations.

What Form is AMS 6365 Available at Piping Mart?

  • Alloy Steel AISI 4130 Bars

AMS 6345 Composition

AMS 6345 sheet is a low-alloy steel with a carbon content of 0.28% – 0.33%. The alloy also comprises manganese, phosphorus, sulfur, silicon, and other trace elements. Adding these elements contributes to the steel’s strength and improved mechanical properties.

C Si Mn P S Cr Mo Fe
Min 0.28 0.15 0.40 0.80 0.15 0.00
Max 0.33 0.35 0.60 0.035 0.040 1.10 0.25 0.00

AMS 6345 Physical Properties

AMS 6345 has a density of 7.85 g/cm³ and a melting point of approximately 1416°C. It is known to possess excellent ductility, toughness, and machinability. It exhibits good resistance to wear and tear, making it ideal for applications that require high durability and impact resistance.

Properties Metric Imperial
Density 7.85 g/cm3 0.284 lb/in³
Melting point 1432°C 2610°F

AMS 6345 Mechanical Properties

AMS 6345 alloy steel grade features an ultimate tensile strength of 1190 MPa with a yield strength of 925 MPa. It has a Rockwell hardness range of C35 – C45, making it suitable for use in various applications.

Properties Metric
Tensile strength, ultimate 560 MPa
Tensile strength, yield 460 MPa
Modulus of elasticity 190-210 GPa
Bulk modulus (Typical for steel) 140 GPa
Shear modulus (Typical for steel) 80 GPa
Poissons ratio 0.27-0.30
Elongation at break (in 50 mm) 21.50%
Reduction of area 59.6
Hardness, Brinell 217
Hardness, Knoop (Converted from Brinell hardness) 240
Hardness, Rockwell B (Converted from Brinell hardness) 95
Hardness, Rockwell C (Converted from Brinell hardness, value below normal HRC range, for comparison purposes only.) 17
Hardness, Vickers (Converted from Brinell hardness) 228
Machinability (Annealed and cold drawn. Based on 100% machinability for AISI 1212 steel.) 70

AMS 6365 Equivalents

AMS 6348 AMS 6371 ASTM A331 ASTM A829 DIN 1.7218
AMS 6350 AMS 6373 ASTM A506 MIL S-18729 UNI 25 CrMo 4
AMS 6351 AMS 6374 ASTM A507 MIL S-6758 JIS SCCrM 1
AMS 6360 AMS 6528 ASTM A513 SAE J1397 JIS SCM 2
AMS 6361 AMS 7496 ASTM A519 SAE J404 SS 2225
AMS 6362 ASTM A29 ASTM A646 SAE J412 B.S. CDS 110
AMS 6370 ASTM A322 ASTM A752 AFNOR 25 CD 4 (S) SAE J770

AMS 6365 Specifications

Country USA BS BS Japan
Standard ASTM A29 EN 10250/EN10083 BS 970 JIS G4105
Grades 4130 25CrMo4/1.7218 708A25/708M25 SCM430

AMS 6345 Uses

AMS 6345 wire is widely used in various industrial applications, including manufacturing aircraft parts, gears, shafts, and axles. It is also used in the automotive, oil and gas, and mining industries for its strength, toughness, and durability. Additionally, it finds its application in producing machine parts, propeller shafts, and connecting rods.

AMS 6345 Hardness

AMS 6345 steel is heat-treated to develop specific hardness levels. It has a Rockwell hardness range of C35 – C45. The steel can undergo heat treatments, including quenching and tempering, to achieve desired mechanical properties.

AMS 6345 Heat Treatment

Heat treatment is a crucial aspect of processing AMS 6345 plate . Heat treatment involves heating the steel to a specific temperature and then cooling it to room temperature to improve its physical and mechanical properties. Different heat treatment processes include annealing, normalizing, and tempering.


AMS 6345 material is an excellent alloy steel grade with exceptional mechanical and physical properties, making it a preferred choice in various industrial applications. Its unique composition, affordability, toughness, and durability make it a popular choice for manufacturers of aircraft parts, gears, and other machine components. Heat treatment plays a significant role in enhancing the steel’s mechanical properties. As a manufacturer, it’s important to understand the different heat treatment techniques used to improve the steel’s performance.

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