Alloy Steel 4130 CNC Machining Services in China

Alloy Steel 4130 is renowned for its remarkable properties in various industries. At Machiningtoday, we’ve mastered the art of Alloy Steel 4130 CNC Machining, bringing unparalleled precision and efficiency to every project.

Our Capabilities in Alloy Steel 4130 CNC Machining

Harnessing the immense potential of Alloy Steel 4130 requires expertise and precision. We combine our years of experience with state-of-the-art machinery to provide you with top-notch CNC machining steel services. Delve into our diverse capabilities:

CNC milling steel

4130 Steel CNC Milling

Our CNC milling operations ensure accurate, repeatable, and efficient machining processes. We’re equipped to handle complex geometries and tight tolerances that Alloy Steel 4130 demands. From flat surfaces to intricate 3D shapes, our milling machines, operated by seasoned professionals, craft functional and aesthetically pleasing components.

CNC turning steel

4130 Steel CNC turning

CNC Turning is an essential capability for cylindrical components. Our advanced CNC lathes bring precision to the turning process, ensuring every rotation shapes the Alloy Steel 4130 to specifications. Whether you require fine detailed work or bulk production runs, our turning services deliver consistent, high-quality results.

Chemical Components of 4130 Alloy Steel

Alloy Steel 4130, called Chromoly due to its chromium-molybdenum composition, is a medium carbon, low-alloy steel. This alloy is known for its impressive strength, toughness, and weldability, making it a favorite in various industries.

The distinctive characteristics of Alloy Steel 4130 can be attributed to its specific chemical makeup. Here’s a detailed breakdown of its components:


Percentage Composition

Carbon (C)

0.28 – 0.33%

Manganese (Mn)

0.40 – 0.60%

Silicon (Si)

0.15 – 0.35%

Chromium (Cr)

0.80 – 1.10%

Molybdenum (Mo)

0.15 – 0.25%

Phosphorus (P)

≤ 0.035%

Sulfur (S)

≤ 0.040%

Iron (Fe)


Mechanical Properties of Alloy Steel 4130

Alloy Steel 4130 is not just recognized for its unique chemical composition but also for its outstanding mechanical properties.

These properties make it highly sought-after in applications where strength, ductility, and toughness are paramount. Industries can better determine its suitability for specific applications by understanding its mechanical characteristics.

Below is a comprehensive table showcasing the mechanical properties of 4130 Steel:



Tensile Strength

785 MPa (approx. 113,800 psi)

Yield Strength

505 MPa (approx. 73,200 psi)

Elongation (in 50mm)


Reduction of Area


Modulus of Elasticity

205 GPa (approx. 29,700 ksi)

Hardness, Brinell


Hardness, Rockwell B


Bulk Modulus (Typical for steel)

140 GPa (approx. 20,300 ksi)

Poisson's Ratio


Surface Finishing Options For Alloy Steel 4130

Alloy Steel 4130, renowned for its mechanical prowess, can be further enhanced or aesthetically altered through various surface finishing techniques. These finishes can provide the material with increased corrosion resistance, improved appearance, or modified surface properties suited for specific applications. Here are the main surface finishing options applied to Alloy Steel 4130:


It involves depositing a metal, such as zinc or chrome, onto the steel’s surface. Electroplating can enhance the alloy’s corrosion resistance, reduce friction, and improve appearance.


A process that cleanses the steel’s surface and enhances its natural corrosion resistance by forming a thin, protective oxide layer.


Through mechanical, chemical, or electrolytic methods, the steel’s surface is refined to give a smooth and shiny finish, enhancing its appearance and corrosion resistance.

Powder Coating

This is a type of coating that is applied as a free-flowing, dry powder. Once cured, it results in a hard finish that is tougher than conventional paint, providing aesthetic and protective qualities to the steel.

4130 steel parts

Common Applications of 4130 Steel Parts

Aerospace: landing gear, structural components, and even specific engine applications.

Automotive: Alloy Steel 4130 is often the material of choice for roll cages, chassis, suspension parts, and other components where strength without excessive weight is critical.

Oil and Gas: drill collars, oil well tools, and more

Cycling: High-performance bicycle frames, especially those used in competitive settings, often utilize Alloy Steel 4130 for its combination of lightweight attributes and durability.

Defense: In the defense sector, the strength and resilience of Alloy Steel 4130 have led to its use in the production of armored vehicles, specific firearm components, and even in the construction of military aircraft.

Heat Treatments For Alloy Steel 4130

Alloy Steel 4130’s characteristics can be significantly enhanced or modified through various heat treatment processes. These treatments unlock the alloy’s potential, catering to specific application needs. Key heat treatments for Alloy Steel 4130 include:


This process involves heating the alloy to around 830°C (1525°F) and then allowing it to cool slowly inside the furnace. Annealing produces a soft structure, making the steel more workable and improving its machinability.


By heating Alloy Steel 4130 to a temperature between 870°C and 900°C (1595°F-1650°F) and then allowing it to air cool, its grain structure is refined, thereby enhancing its strength and toughness.


Achieved by first heating the steel to 815°C (1500°F) followed by water quenching. This process elevates the steel’s hardness and tensile strength.


Post the hardening process, the alloy is re-heated to a temperature between 450°C and 675°C (840°F-1250°F), which reduces brittleness while retaining much of its hardness. This ensures the steel possesses a balance of strength and ductility.

Why choose our China 4130 steel CNC machining service?

Regarding alloy steel 4130 CNC machining, not all services are created equal. With years of hands-on experience, we offer:

stainless steel CNC machining

Precision Beyond Comparison: Our state-of-the-art tools and advanced techniques deliver accuracy and consistency.

Tailored Solutions: Our 4130 Steel Machining solutions cater to various aerospace and automotive requirements.

Quality Assurance and Inspection: Quality is paramount in machining, especially so with materials as specialized as 4130 Alloy Steel. Our dedicated quality assurance team employs rigorous inspection protocols, using manual and automated methods, to ensure that every part meets the set standards and client expectations.

Customized Solutions: Recognizing that each client’s needs are unique, we offer tailored Alloy Steel 4130 CNC machining solutions. Whether it’s a specific design, a unique finish, or a special assembly requirement, our team collaborates closely with clients, transforming their visions into tangible, high-quality components.

Related Precision Machining Metals

4130 Alloy Steel Machining FAQs

Alloy Steel 4130 offers strength, versatility, and toughness, making it preferred in aerospace, automotive, and more.

Our CNC machines and our experts’ experience ensure each part is crafted to exact specifications.

Absolutely. We pride ourselves on bringing any design to life, no matter how intricate.

While it varies by project size and complexity, we always strive for swift and efficient delivery.

4140 and 4130 steels are chromium-molybdenum alloys, showcasing similar characteristics but distinctive differences that make them suitable for particular applications. The primary distinction lies in their carbon content: 4140 steel contains more carbon (around 0.38-0.43%) compared to 4130 steel (which has about 0.28-0.33%). This variation significantly impacts their mechanical properties.

4140 typically presents a higher tensile strength and yield strength due to its increased carbon content, making it preferable for applications requiring higher resistance and durability. On the other hand, 4130, with its slightly lower carbon content, offers better weldability, making it the choice for projects that involve a lot of welding. Additionally, 4140 tends to respond better to heat treatment, allowing for a broader range of mechanical properties post-treatment.

In summary, while both steels are versatile and find uses across various industries, their choice often boils down to the project’s specific needs, be it strength, weldability, or responsiveness to heat treatments.

Looking For Precision Alloy Steel 4130 CNC Machining Shop In China?

Seeking unmatched precision for your projects? Look no further if you’re searching for a leading 4130 Steel CNC Machining Shop in China. Dive into world-class craftsmanship and top-tier results. Contact us today and elevate your machining needs!