Special Steel 25CrMo4/1.7218/SCM430 Alloy Steel

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Overview of Special Steel 25CrMo4/1.7218/SCM430 Alloy Steel

Are you curious about a steel that balances strength and versatility? Meet Special Steel 25CrMo4, also known by its aliases 1.7218 and SCM430. This alloy steel is celebrated for its high strength, toughness, and excellent machinability, making it a top choice across various industries. Whether you’re in automotive manufacturing, aerospace engineering, or machinery production, 25CrMo4 stands out as a robust and reliable material.

Types, Composition, Properties, and Characteristics

Chemical Composition of Special Steel 25CrMo4/1.7218/SCM430 Alloy Steel

Understanding the chemical makeup is key to appreciating what makes 25CrMo4 so special. This steel’s unique composition enhances its mechanical properties, making it suitable for demanding applications.

Nguyên tốTỷ phần trăm
Carbon (C)0.22-0.29%
Silicon (Si)0.15-0.35%
Manganse (Mn)0.60-0.90%
Phốt pho (P)≤ 0.025%
Lưu huỳnh (S)≤ 0,035%
Crôm (Cr)0.90-1.20%
Molypden (Mo)0.15-0.30%
Special Steel 25CrMo41.7218SCM430 Alloy Steel

Mechanical Properties and Characteristics

The chemical composition directly influences the mechanical properties. Here’s a snapshot of the key characteristics that make 25CrMo4 a standout alloy steel.

Độ bền kéo850-1000 MPa
Yield Strength700-850 MPa
Impact Toughness≥ 41 J at -20°C
Hardness (annealed)217 HB max
Modulus of Elasticity210 GPa
Density7.85 g/cm³
Thermal Conductivity38.7 W/m·K (at 20°C)

Applications of Special Steel 25CrMo4/1.7218/SCM430 Alloy Steel

Where is this steel used? Let’s explore the diverse applications of 25CrMo4 across various industries.

Ngành công nghiệpApplication
Ô tôCrankshafts, gears, and axle shafts
Không gianLanding gear components, engine parts
Machinery ManufacturingHydraulic machinery, machine tools
Oil and GasDrilling rigs, pressure vessels
DefenseMilitary vehicles, artillery components
General EngineeringStructural components requiring high strength and toughness

Specifications, Sizes, Grades, and Standards

Common Specifications and Standards

To ensure quality and performance, 25CrMo4 alloy steel adheres to stringent standards.


Available Sizes and Grades

The versatility of 25CrMo4 is reflected in its range of sizes and grades, tailored to meet specific needs.

FormKích thước
Round Bars6mm to 350mm
Square Bars20mm to 200mm
PlatesThickness: 10mm to 150mm
SheetsThickness: 2mm to 50mm
TubesOD: 13.7mm to 323.9mm; WT: 1.5mm to 40mm

Suppliers and Pricing Details

Top Suppliers

Finding a reliable supplier is crucial for ensuring the quality and consistency of 25CrMo4 alloy steel.

Nhà cung cấpRegionContact Information
ThyssenKruppGlobal[email protected]
VoestalpineEurope, Americas[email protected]
BaosteelAsia[email protected]
ArcelorMittalGlobal[email protected]
Nippon Steel CorporationJapan, Global[email protected]
Special Steel 25CrMo41.7218SCM430 Alloy Steel

Pricing Overview

The cost of 25CrMo4 alloy steel can vary based on factors such as size, quantity, and market conditions.

FormPrice Range (USD/kg)
Round Bars$2.50 – $4.00
Plates$3.00 – $5.00
Sheets$2.80 – $4.50
Tubes$3.20 – $5.50

Comparing Pros and Cons, Advantages and Limitations

Advantages of 25CrMo4 Alloy Steel

What makes this steel a favorite? Let’s dive into its advantages.

High StrengthExcellent tensile and yield strength for demanding applications
Good ToughnessMaintains impact resistance even at low temperatures
VersatilitySuitable for a wide range of industrial uses
Khả năng gia côngEasier to machine compared to many other high-strength steels
Heat TreatableProperties can be enhanced through heat treatment processes

Limitations of 25CrMo4 Alloy Steel

No material is without its drawbacks. Here’s what to consider.

Chi phíMore expensive than lower-grade steels
Khả năng chống ăn mònRequires coating or treatment to improve corrosion resistance
AvailabilityMay not be as readily available in all regions
WeldingRequires careful pre and post-weld heat treatment
Special Steel 25CrMo4/1.7218/SCM430 Alloy Steel


What is 25CrMo4 steel?25CrMo4 is a high-strength alloy steel known for its toughness, versatility, and machinability.
How does 25CrMo4 compare to other alloy steels?It offers a balance of strength and machinability, often outperforming other steels in these areas.
What industries use 25CrMo4 alloy steel?Commonly used in automotive, aerospace, machinery manufacturing, oil and gas, and defense.
Can 25CrMo4 steel be welded?Yes, but it requires specific pre and post-weld heat treatments to maintain its properties.
What are the main standards for 25CrMo4 steel?EN 1.7218, DIN 25CrMo4, ASTM A29, JIS SCM430, and ISO 683-1 are some of the key standards.


Special Steel 25CrMo4, also known as 1.7218 and SCM430, stands out as a versatile and robust alloy steel. Its high strength, toughness, and excellent machinability make it a go-to material across numerous industries, from automotive to aerospace. While it comes with its set of limitations, the advantages often outweigh the drawbacks, especially in applications requiring high performance and reliability.

So, whether you’re designing a critical component in an aircraft or crafting durable machinery parts, 25CrMo4 alloy steel is a solid choice to consider. Dive into the world of alloy steels and discover how 25CrMo4 can meet your project’s demands with flying colors.

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