If you’ll need ASTM A829 4140 steel plate, you’ve likely come across a range of specifications, grades, and suppliers. But what does all of this mean for your demand? Whether you’re a manufacturer, end user, or distributor, understanding the key properties and applications of this versatile alloy 4140 plate is essential.

What is ASTM A829 4140 Steel Plate?

ASTM A829 4140 is a medium-carbon alloy steel that contains chromium and molybdenum, with unique mechanical properties. It’s known for its high tensile strength, durability, and excellent performance in harsh conditions. This steel is typically used in its as rolled or quenched-and-tempered (Q&T or preharden) condition, which makes it suitable for high-stress applications that require both toughness and strength.

Get high-strength ASTM A829 4140 steel plate at Otai. Durable, tough, and cost saving for industries like automotive, aerospace, and more!

Here’s a quick information of what makes 4140 steel popular:

  • Chemical Composition: Carbon (0.36%-0.44%), Manganese (0.75%-1.00%), Chromium (0.80%-1.10%), Molybdenum (0.15%-0.25%).
  • Mechanical Properties: High tensile strength (up to 260,000 psi), toughness, and excellent hardenability.
  • Heat Treatment: Can be heat-treated to achieve desired hardness and strength. The hardness after further QT can be 54-59HRC while the general preharden hardness is 28-32HRC.

With these characteristics, ASTM A829 4140 steel plates are ideal for applications that demand high mechanical properties and durability.

Why Choose ASTM A829 4140 Steel Plates?

If you’re wondering why 4140 is so popular, it’s because of the versatile performance it offers in demanding industrial applications. Let’s explore the main benefits:

Strength and Durability

4140 is one of the strongest alloy steels available. With a tensile strength of up to 260,000 psi, it’s often used in heavy-duty applications such as machinery parts, automotive components, and aerospace applications.

Toughness and Fatigue Resistance

This alloy’s toughness makes it ideal for parts that are exposed to repeated stress and fatigue.

Good Machinability

While 4140 steel is tough, it can still be machined relatively easily. This makes it a good choice for manufacturers who need high-quality components.

Applications of ASTM A829 4140 Steel Plates

The versatility of ASTM A829 4140 steel means it’s used across various industries.

Some of the most common applications include:

  • Machinery Parts: Used in manufacturing components like machine bases, frames, and structural parts that require high strength and toughness.
  • Tooling & Dies: Ideal for the production of dies, molds, and tooling parts due to its excellent hardness and wear resistance.
  • Heavy Equipment Components: Frequently used in parts like gears, axles, and brackets in industries like construction and mining.
  • Automotive Components: Used for parts such as transmission components, automotive gears, and heavy-duty vehicle frames.
  • Pressure Vessels & Valves: 4140 steel plates are often used in high-pressure systems and valve components that require superior strength and resistance to wear.
  • Aerospace Components: Used in parts such as landing gear, aircraft components, and structural parts that demand high strength and fatigue resistance.

Processing and Heat Treatment Considerations

4140 steel is highly adaptable to various processing methods, which makes it an excellent choice for a wide range of applications.

About heat treatment, you could refer to below information:

Heat Treatment Options

  • Quenching and Tempering (Q&T): This process enhances the steel’s hardness and strength. The steel is heated to a specific temperature and then rapidly cooled in water or oil. Tempering follows to adjust the hardness to the desired level.
  • Annealing: This process is used to soften the material, making it easier to machine and process.
  • Normalizing: This involves heating the steel to a temperature higher than its critical temperature, then cooling it in air. This is often done to refine the grain structure and improve machinability.

Welding and Machining

When welding 4140 steel, it’s important to preheat the 4140 plate material to prevent cracking. Stress-relief heat treatment post-welding can also help maintain its properties.

Machining A829 4140 plate in the annealed condition is relatively easy, but when in the hardened condition, it requires more advanced techniques due to the steel’s increased strength.

Key Standards and Specifications

When purchasing ASTM A829 4140 steel plates, it’s important to ensure the material meets the required specifications:

  • ASTM A829: This standard outlines the chemical composition and heat treatment requirements for 4140 alloy steel.
  • Thickness and Dimensions: ASTM A829 4140 steel plates come in a range of thicknesses, typically from 5mm to 152mm. But besides of those thickness, we can also supply up to 300mm thickness and the thickness from 200mm to 300mm would be forged plates.
  • Surface Conditions: Plates can be supplied in hot-rolled (As rolled, AR), annealed (A), or Q&T (Pre harden, PH) conditions depending on your application.

How to Choose the Right ASTM A829 4140 Steel Plate for Your Application ?

Choosing the right 4140 steel plate depends on several factors, including:

  • Required Strength and Hardness: Depending on your application, you may need a plate with high tensile strength or greater toughness. Always make it clear on the mechanical properties before placing an order.
  • Heat Treatment Needs: If your application demands specific hardness levels, make sure you choose a supplier that offers heat-treated 4140 steel plates.
  • Custom Sizes: Ensure the 4140 steel plate supplier offers custom sizes and cutting services. Many manufacturers require specific dimensions for their parts, so having a supplier that can provide custom-cut plates is crucial.

Challenges and Solutions for Working with ASTM A829 4140 Steel Plates

While 4140 steel is an excellent material, it’s not without its challenges. Here are some common pain points and how to solve them:

Inconsistent Hardness Across Batches

One common issue with 4140 steel is the variation in hardness between batches, which can affect the performance of your final product. To prevent this, choose a supplier with robust quality control processes. At Otai Special Steel, we ensure 100% ultrasonic testing and chemical analysis to guarantee consistent material quality.

Processing Challenges

Welding and machining 4140 steel require specific techniques to avoid issues like cracking or excessive wear on equipment. If you’re unsure about how to work with 4140, we provide technical support to guide you through the best practices.

Delivery Time Issue

Having a reliable supplier is crucial to avoid delays in production. At Otai Special Steel, we maintain a large inventory of over 10,000 tons of 4140 steel plates, ensuring you’ll have the material when you need it.

Why Choose Otai Special Steel for ASTM A829 4140 Steel Plates?

When it comes to buying high quality ASTM A829 4140 steel plates, Otai stands out as a trusted supplier. Here’s why:

  • Stable Supply: With over 10,000 tons of stock, we ensure you’ll never face a material shortage.
  • Custom Cutting and Machining: We offer customized sizes and machining services to meet your specific project requirements, no matter cut to size tolerance or machine to given roughness.
  • Quality Assurance: Our strict quality control processes include 100% ultrasonic testing and chemical analysis to guarantee the highest quality material. Besides, you could also appoint any third party like SGS or your own representative to do the inspection during order process or before shipment.
  • Global Reach: We have experience supplying to various industries, including aerospace, automotive, and oil and gas, with competitive prices and on-time delivery.

Conclusion: Get Your ASTM A829 4140 Steel Plate Today

Finding the right ASTM A829 4140 steel plate can make all the difference in the performance and longevity of your components. With its excellent strength, toughness, and resistance to wear, 4140 is a top choice for demanding applications.

At Otai, we make it easy for you to get the 4140 steel plates you need with flexible options, competitive prices, and reliable delivery.

You can even request the stock list and you choose from our stock material today and we can arrange loading tomorrow.

Don’t wait—contact us today for a quote or to discuss your specific requirements.

You can reach us via email at jeremy@otaisteel.com or through WhatsApp at +8613610149979.

 

FAQs

1. What is the maximum thickness of ASTM A829 4140 steel plates available?

The maximum thickness for ASTM A829 4140 steel plates is generally 152mm, but we can provide up to 300mm to meet your needs.

2. Can you supply heat-treated 4140 steel plates?

Yes, we offer both annealed and quenched-and-tempered (Q&T) 4140 steel plates, while the QT hardness is usually 28-32HRC.

3. How do I know if 4140 plate is the right choice for my application?

4140 steel is ideal for high-strength, high-toughness applications. If you need steel for machinery, automotive parts, or tools, 4140 is a good option. Or you could check with our engineer today for more information.

4. How do I get a quote for 4140 steel plates?

Simply send us your requirements by email or WhatsApp, including thickness, quantity, and delivery details, and we’ll provide a quote within 24 hours.

5. What industries use ASTM A829 4140 steel plates?

4140 steel plate is widely used in automotive, aerospace, oil & gas, and tooling industries, among others.