Songshun Steel & TOP Steel Manufacturer Supplier in China

Close this search box.
Songshun Steel-Logo

Songshun Steel-Logo

4340 Alloy Steel: A Versatile Material

4340 alloy steel is a versatile material that has attracted much attention for its excellent properties and wide range of applications. It has excellent performance in fields such as engineering, automobiles, trains, tools and machinery manufacturing. Due to its excellent performance, 4340 steel can adapt to a variety of harsh environments, ensuring a long service life of parts or tools. This article will take you to understand the multiple properties of 4340 alloy steel and better apply it.

4340 Steel with Excellent Hardenability

AISI 4340 alloy steel can achieve excellent quenching effect after quenching and has good deep hardenability, making its structure uniform, no obvious martensitic structure defects and overall performance improvement. It is ideal for manufacturing high-strength and large parts. Ideal for use in high-strength alloy steels.

High Strength 4340 Alloy Steel

This steel has higher yield strength and tensile strength than 4140 alloy steel. The tensile strength is ≥980 (100) (MPa) and the yield strength is ≥835 (85) (MPa). It can withstand large loads and high pressures. And the addition of alloy elements in 4340 steel can effectively enhance the grain boundary strength and dislocation movement resistance of the steel, thereby improving its overall strength. Making it very useful in the manufacturing and aerospace industries, especially when making important load-bearing structures.

High Fatigue Resistance 4340 Material

The 4340 material usually forms fine carbide particles during the quenching and tempering process. These particles help improve the fatigue resistance of the steel, giving it excellent fatigue resistance and creep resistance, and the ability to withstand cyclic loads and maintain Stable performance, not prone to creep when subjected to tensile stress, suitable for parts subjected to cyclic stress, such as shafts, gears, etc.

4340 Alloy Steel Excellent Toughness

At high temperatures, 4340 alloy steel maintains excellent toughness and is able to resist shock and vibration loads. And through appropriate quenching and tempering processes, 4340 can make the steel obtain good organizational structure and grain boundary strengthening, thereby improving its impact resistance and toughness.

Good Wear Resistance 4340 Steel

SAE 4340 steel is added with chromium and molybdenum. The chromium element can form a strong oxide film to improve the wear resistance of the steel surface; molybdenum can enhance the tensile strength and hardness of the steel, making it more wear-resistant.

Air Hardenability of 4340

The ability of SAE 4340 alloy steel to harden thin sections when cooled in air gives it high flexibility in the manufacturing process.

In addition to the above, 4340 alloy steel also has good weldability, excellent atmospheric corrosion resistance, easy processability, high hardness, etc. Nowadays, with the continuous development of modernization process and manufacturing industry, the market demand for 4340 materials continues to increase. Our Songshun Steel, continue to meet the needs of the market and customers, and are committed to providing excellent quality 4340 steel products and services.


Steel Round Bar

Songshun Steel-Logo

Dongguan Songshun Mould Steel Co., Ltd.

Welcome to contact us at any time through the following ways
Or you can email directly to

Open chat
Hi, this is Songshun Steel(TOP Steel Manufacturer Supplier in China)
What can we help you?