40Cr SCr440 ASTM 5140 Steel Round Steel Bar

Technique Hot Rolled
Application Structural Steel Bar
Alloy Or Not Non-Alloy
Special Use Cold Heading Steel
Type Alloy Carbon Steel Bar
Tolerance ±1%
Processing Service Bending, Welding, Decoiling, Cutting, Punching
Delivery Time 15-21 days

Product Introduction

1.Chemical composition: The chemical composition of 38CrMoAl steel includes the following elements:


  • Carbon (C): it accounts for about 0.35% to 0.45%.Carbon is a key element in steel. It can improve the hardness and strength of steel, but it will also increase its brittleness.
  • Chromium (Cr): Can improve the hardening ability, corrosion resistance and wear resistance of steel.
  • Molybdenum (Mo): Mainly used to improve the strength and hardness of steel.
  • Aluminum (Al): Can enhance the strength and processability of steel.


2.Characteristics: 38CrMoAl steel has a good combination of strength, toughness and wear resistance.It is suitable for manufacturing parts that require high strength and wear resistance, such as gears, shafts and other heavy machinery parts.



3.Use: 38CrMoAl steel is widely used in the machinery manufacturing industry.It is usually used to produce parts that require high durability and high strength, and these parts often work in high-load and high-pressure environments.



4.Heat treatment: 38CrMoAl steel can undergo appropriate heat treatment, such as quenching and tempering, to adjust its organization and properties to meet specific application needs.


5.Specifications: 38CrMoAl steel is usually supplied in the form of round steel, square steel or flat steel. Specific specifications and sizes can be customized according to customer requirements.

38CrMoAL Alloy Steel Chemical Composition:








Chemical composition







Mechanical properties:


Tensile strength

Yield strength



Heat treatment status





Tempering state





Specified tensile sample





1)Gears: 38CrMoAl steel is commonly used in the manufacture of high-strength and wear-resistant gears, especially for gears in heavy machinery and automotive transmission systems.
2) Shaft: Because the steel has good strength and toughness, it is suitable for manufacturing shafts that withstand high loads and high speeds, such as automobile drive shafts, motorcycle engine shafts, etc.
3) Pins and bolts: 38CrMoAl steel is commonly used in the manufacture of connecting parts, such as pins and bolts, for the connection of mechanical parts.
4)Cylinder and crankshaft: This steel can provide good wear resistance and strength when manufacturing cylinder blocks and crankshafts of internal combustion engines.
5)Bearings and nuts: Because 38CrMoAl steel has high hardness and wear resistance, it is commonly used in the manufacture of bearings and nuts.
6)High-pressure screw: Due to the high strength and toughness of the steel, it is suitable for the manufacture of high-pressure screws and is used in the engineering and construction fields.
7)Hydraulic cylinder: 38CrMoAl steel can also be used to manufacture hydraulic cylinders for construction machinery and hydraulic equipment.
8)Injection molds: Due to their wear resistance and heat resistance, 38CrMoAl steel is commonly used in the manufacture of plastic injection molds to withstand high pressure and high temperature working environments.

Classification By Size:

  • Round steel: 38CrMoAl round steel is one of the most common forms.The diameter of round steel is usually measured in millimeters (mm), such as 10mm, 20mm, 50mm, etc.


  • Square steel: Square steel is a steel with a quadrilateral cross-section, and its size is usually measured in millimeters, such as 10mm×10mm, 30mm×30mm, etc.


  • Flat steel: Flat steel is a steel with a larger width and thinner thickness. Its size is usually expressed in millimeters, such as 30mm×5mm, 40mm×8mm, etc.


  • Sheet: 38CrMoAl sheet is a wider and thicker steel used to manufacture larger parts.The size of the sheet is usually expressed in thickness and width (in millimeters), such as 10mm thick×1000mm wide, 20mm thick×1500mm wide, etc.

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