Top 5 Properties of 4130 Tubing You Must Know: With Its 8 Applications

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You are well aware that steel powers most cars, aeroplanes, and trains if we are not wrong. Do you know what makes steel a suitable choice for these transportation methods? The properties of 4130 steel, including its toughness and capability of getting machined and welded with ease. An impressive fact about this grade of steel is that it develops various mechanical properties that translate into a robust metal when it gets heated. Although, the chances are high that it may lose some machinability characteristics during this process. All in all, 4130 steel is an appropriate material for automotive, aeronautic, and aerospace engineering. So, if you want to buy 4130 tubing now, speak today to a customer-driven dealer of stainless steel in Missouri.

With that complete, it’s time to take a look at what 4130 tubing is:

What is 4130 Steel?

4130 Steel or Chromoly is a steel alloy made of chromium and molybdenum, containing 0.8 to 1.1% chromium and 0.15 to 0.25% molybdenum. Since 4130 steel is designated as low carbon steel, it offers high ductility, good weldability, and easy machinability.

What are the standard applications of 4130 Steel?

Knowing that 4130 steel has high strength and weldability, the manufacturers use it for different purposes, such as:

  1. Military aircraft
  2. Commercial jets
  3. Hydraulic functions
  4. Machine tools
  5. Automotive
  6. Aerospace
  7. Motorsports
  8. Welded tubing (in oil and gas industries)
  9. Car parts and machine components

What are the various properties of 4130 steel?

  1. Density – 7.85 g/cm3
  2. Machinability – 72% (in the annealed state)
  3. Hardness – 217 (Brinell scale) – 95 (Rockwell B scale)
  4. Ultimate Tensile Strength – 540 MPa
  5. Yield Tensile Strength – 460 MPa
  6. Modulus of Elasticity – 205 GPa

What are the primary characteristics of 4130 steel?

  1. Forging 

Do you know that 4130 steel is forged at a temperature ranging from 950 degree Celsius to 1230 degree Celsius? The steel alloy’s grain will become finer if the temperature is on the lower side during forging. While if the temperature is too low, it could affect the uniformity of the whole structure.

Thus, if that happens, it could be necessary to normalise it before heat treating the steel. If you don’t know what the term “forging” means, it is the capability of shaping metals by heating them in fire and hammering after that.

  1. Weldability 

The term “weldability” refers to the potential of metals to how easily they can get welded. And when it comes to 4130 steels, they are a breeze to weld owing to their low carbon content.

  1. Machinability

Machinability is any metal’s ability to get cut or shaped effortlessly while offering a smooth surface finish. And if we talk about 4130 steels, it is easy to get machined unless and until it has hardened.

The last thoughts

We hope you have learned the various properties and applications of 4130 steel in this blog post. So, if you want to buy 4130 steel tubes, contact a well-known supplier of stainless steel in Missouri now.

Four Commonly Used Alloying Elements in Stainless Steel

Stainless steel is a steel alloy that contains 10.5% chromium with or without other alloying elements and has a maximum of 1.2% carbon by mass. It is mainly known for its corrosion resistance properties, which can be enhanced by adding nickel and molybdenum. Its ability to resist corrosion makes the alloy “stainless.” The resistance of the metallic alloys in stainless steel to corrosion is based on passivation. The prevalence and stability of passivation depend on the condition that Fe-Cr alloy must have a minimum chromium content of about 10.5% by weight. Chromium forms a thin layer of chromium oxide on the steel surface. It forms a “passive layer” that acts as a reliable protective coating for stainless steel. The passive layer has self-healing capability. The presence of chromium also hardens and then toughens stainless steel.

You can roll stainless steel into sheets, plates, bars, wire, and tubing. 316 stainless steel tube is a popularly used grade in various industries and belongs to the austenitic stainless-steel family. It shows excellent corrosion resistance, weldability, machinability and is helpful in different applications at high temperatures. It finds use in food processing components, pharmaceutical, and chemical equipment.

The presence of varying alloying elements in differing compositions ascribes to it its various pertinent properties. The metallic alloy has an iron base. Pure iron is very soft, and its mechanical strength improves only by adding different alloying elements like carbon, manganese, or silicon. The alloys support engineering construction. The commonly used alloying elements in stainless steel include:


Carbon is a non-metallic element present in all grades of stainless steel. Its austenitizing solid and increasing carbon content improves the hardness and strength of stainless steel. In stainless steel, carbon is the principal hardening element. You cannot harden or strengthen pure iron by heat treatment. The addition of carbon, however, enables a wide range of hardness and strength. But the presence of a higher amount of carbon makes stainless steel brittle and reduces its weldability.


The presence of chromium in stainless steel increases its hardness, strength, and corrosion resistance. Chromium is critical in the manufacturing of stainless steel. It increases steel’s resistance to oxidation.  It forms a self-repairing passive layer of Chromium Oxide on the steel surface. At higher temperatures, it increases the strength of stainless steel.


Nickel is a commonly used alloying element in the production of stainless steel. Nickel enhances its essential properties such as formability, weldability, and ductility. At elevated temperatures, it improves stainless steel’s resistance to oxidation and corrosion. It also reduces thermal expansion for better dimensional stability. Nickel helps in stabilizing the austenitic structure of the steel at room temperature and below.


Like chromium, molybdenum impacts the corrosion resistance of steel. It also increases stainless steel’s hardenability and strength, generally at high temperatures. It has a high melting point, due to which it gives strength to steel at high temperatures. Molybdenum also increases steel’s high-temperature tensile and creep strengths. It improves stainless steel’s resistance to pitting and crevice corrosion, generally in chlorides and sulfur-containing environments.

To Conclude:

The presence of these alloying elements in varying compositions determines the properties of stainless steel. It renders it useful for different end-uses to serve essential purposes across various industries.