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Alloy Steel 4130

4130-alloy steel (1)

Material Type

Metal

Material Name

Alloy Steel 4130

Alternative Names

AISI 4130 | 25CrMo4 | 1.7218 | 708A25 | SCM430

Process Compatibility

CNC Milling, CNC Turning

introduction

Alloy Steel 4130 in CNC Machining

alloy steel 4130 metal part

Alloy steel 4130 is a versatile and widely used material in CNC machining, particularly in the aerospace and automotive industries.

It has excellent strength, toughness, and hardenability. It also offers good weldability and machinability. It contains chromium and molybdenum, giving it high strength and resistance to wear, heat, and corrosion. We use carbide or cobalt-based tools for CNC machining 4130 as they provide the necessary hardness and wear resistance for cutting operations. Alloy steel 4130 is best machined at cutting speeds appropriate for medium-hard materials. We use a coolant or cutting fluid to dissipate heat generated during machining to prevent tool wear, improve surface finish, and extend tool life. We also lubricate to reduce friction and heat during cutting operations. 4130 undergoes forging at temperatures ranging from 950 °C to 1230 °C, with lower temperatures in the finishing stage resulting in a finer grain structure.

If the forging temperature is too low, it may lead to structural non-uniformity, necessitating normalization before heat treatment. Heat treatment aims to prepare and enhance the properties of 4130 steel for machining. The four primary methods are annealing, normalizing, hardening, and tempering. Grinding or other finishing operations may be required to achieve tight tolerances and surface finish specifications. Chromoly's machinability is straightforward, with annealed 4130 having a 72% rating, potentially increased by further hardening. We always consider the specific requirements of your project and implement suitable processes.

Properties

Properties Table of Alloy Steel 4130

MECHANICAL PROPERTIES
Ultimate Tensile Strength  540 MPa
Yield Strength 460 MPa
Young's Modulus(Elasticity)  2050 GPa
Physical Properties
Corrosion Resistance Moderate
Magnetism Magnetic
Weldability Easy, low carbon content

TECHNOLOGY OVERVIEW

Basic Knowledge of Alloy Steel 4130

What is Alloy Steel 4130?

4130 steel, also called Chromoly, is an alloy with 0.8-1.1% chromium and 0.15-0.25% molybdenum for strength. It is versatile, with good mechanical properties like high ductility, weldability, and machinability.

It belongs to the 41xx steel alloy family and has a higher strength-to-weight ratio than standard stainless steel or mild carbon steel. Chromoly is useful in various applications despite being more brittle than mild steel. Its low carbon content allows for easy welding using TIG or MIG methods. The 41xx designation comes from the AISI and SAE, specifying alloy steels for different purposes.

Advantages of Alloy Steel 4130

  • Excellent strength-to-weight ratio
  • Good weldability
  • Machinability
  • Responsive to heat treatment
  • Versatile for various applications
  • Corrosion resistance (moderate)
  • Cost-effective alternative
  • Widely used in aerospace applications

Applications of Alloy Steel 4130

  • Aircraft engine mounts
  • Landing gear components
  • Automotive chassis components
  • Industrial machinery parts
  • Building and bridge construction
  • Power generation turbine components
  • Racing car chassis and roll cages
  • Marine engineering components

FAQ

Machining Alloy Steel 4130 Buying FAQs

Welding 4130 is possible with TIG or MIG. Preheat isn't usually required for thin sections (up to 0.120-in), but for larger tubing, use a 300F-400F preheat. ER80S-D2 is a common filler metal choice.
4130 steel can be hardened through quenching and tempering. After heating the material to the appropriate temperature range (typically around 1600°F or 870°C), it is rapidly quenched in oil or water to achieve maximum hardness. Subsequently, the hardened steel is tempered at a lower temperature to balance hardness and toughness.
Yes, 4130 steel is widely used in the manufacturing of bike frames due to its excellent strength-to-weight ratio and durability. It can withstand the stress and loads encountered in cycling. Many high-quality and performance-oriented bicycle frames are made from 4130 steel.

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