4 Advice to Choose a Mild Steel Material

09 Apr.,2024

 

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Mild steel is ideal for welding and metal fabrication. Low carbon mild steel is extremely versatile as a weldable metal -- carbon percentages cap out at around 0.25-0.30% -- and have few, if any, unnecessary alloying elements. Mild steel is less expensive than other metals and is easier to work with than other welding materials.

 

The higher the carbon content, the more difficult the steel is to weld. Low carbon mild steel is the industry standard for room-temperature welding work. The most common types of mild steel (AISI 1010, 1018, and 1020) all contain trace amounts of carbon and are ideal for welding.


 

Types of Low Carbon Steel For Common Applications

 

Many options exist within the world of low carbon steels. Depending on your intended usage, your choice may vary between some of the more common types. If you have any questions or would like a free consultation, feel free to contact our experts here.

 

AISI 1010 Mild Steel

 

AISI 1010 mild steel is commonly used in applications where particularly high tensile strength is not required. AISI 1010 is used widely in the automotive industry, particularly in:

  • Transmission covers
  • Auto bodies
  • Fenders

You'll also find 1010 grade steel used to manufacture fasteners and bolts.

 

1010 grade steel contains 0.10% carbon. With this uniquely low carbon content, AISI 1010 can be welded using any conventional technique.


 

AISI 1018 Mild Steel

 

1018 mild steel is a common type of carburizing steel. 1018 steel is used in a wide range of applications:

  • Gears
  • Chain pins
  • Machine parts
  • Spacers

1018 grade steel contains 0.18% carbon. AISI 1018 is easy to weld and does not require additional pre- or post-heating.

 

AISI 1020 Mild Steel

 

1020 mild steel is yet another type of low carbon steel used in a variety of applications. 1020 is incredibly versatile and has an excellent mix of strength and ductility. You'll find 1020 steel used in the following areas:

  • Machine parts
  • Camshafts
  • Gears
  • Pins
  • Axles

1020 mild steel contains 0.20% carbon. For welding, 1020 grade mild steel is easily welded using any of the conventional methods.

 

Choosing the Best Mild Steel For

Welding

The lower the carbon content, the better the steel is for welding. However, choosing the best mild steel for welding depends on the intended application of the steel. Our experts at Blackstone Advanced Technologies are happy to help you with your sheet metal fabrication needs -- please contact us today!

Due to its excellent properties, mild steel has become an in-demand material in steel fabrication. It has unparalleled weldability and machinability, which has led to an exponential increase in its usage.

In this article, we will discuss the importance of mild steel, its uses and how it’s made.

What Is Mild Steel?

Mild steel is a type of carbon steel with a low amount of carbon, thus the terms low-carbon steel and mild steel are generally used interchangeably. Carbon steels are metals that contain a small percentage of carbon (max 2.1%) which enhances the properties of pure iron. The carbon content varies depending on the requirements for the steel. Low-carbon steels contain carbon in the range of 0.05 to 0.25%.

There are different grades of mild steel. But they all have carbon content within the above-mentioned limits. Other elements are added to improve useful properties like corrosion resistance, wear resistance and tensile strength.

How Is Low Carbon Steel Made?

Carbon content is uniformly increased by heat treating steel. As carbon content increases, steel develops hardness but loses ductility. This means that the metal becomes brittle and may fracture instead of bending when applying an excess load.

The manufacturing processes for mild steel are similar to other carbon steels. Higher carbon steels just contain more carbon, resulting in different properties like high strength and hardness values compared to mild steel.

These processes have developed over time and are now much more cost-effective than before. In modern manufacturing, three steps are involved in manufacturing mild steel out of pure iron.

Primary Steelmaking

In this leg of the steelmaking process, the iron ore is mixed with coal and lime and heated in a blast furnace having a 100 to 400-ton capacity. Lime acts as a flux and forms a protective layer on top of this hot molten metal.

Modern primary steelmaking uses Basic Oxygen Furnace (BOS) or Electric Arc Furnace (EAF) processes. These are both based on the original Bessemer process for steelmaking.

In the basic oxygen furnace process, oxygen is blown through the molten iron while scrap steel is added to the converter. This reduces the carbon content to a maximum of 1.5%.

In developed countries, the electric arc furnace is used to feed scrap steel through extremely high-powered electric arcs. This results in impressive quality steel.

Secondary Steelmaking

The second step in the process of making mild steel includes further reducing its carbon contents and adding alloying elements.

Manipulating the furnace conditions (temperature, cooling rate, etc.) also aids this process. Ultimately, the type of steel desired will decide the secondary steelmaking process. One may choose from the following processes:

  • CAS-OB
  • Degassing
  • Ladle furnace
  • Ladle injection
  • Stirring

Casting and Primary Forming

Once the steel has the specified carbon content and other elements that enhance its performance, the molten steel is poured into a mould. This is the casting process. Here, the steel is shaped and allowed to solidify. Afterwards, the solidified metal is cut into desired shapes like slabs, blooms and billets.

At this stage, the raw material slabs might be affected by casting defects. To improve surface quality, hot rolling is often used as the primary forming process. Hot rolled steel products are usually categorised into flat products, custom products, long products, and seamless tubes.

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Secondary Forming

Although we have completed mild steel production by the end of the abovementioned process, it is usually formed one more time to improve its mechanical properties in line with application requirements.

Secondary forming gives it the final shape and properties. The forming methods include:

  • Shaping through cold rolling
  • Machining
  • Coating
  • Tempering
  • Surface treatment, etc.

Chemical Properties of Mild Steel

As mentioned above, mild steel has lower carbon content than medium and high carbon steels. The carbon content is up to 0.25% in mild steel but some schools of thought consider carbon steel as mild steel up to a carbon content of 0.45%.

The low carbon content makes this steel a highly machinable metal. It can be cut, machined and formed into intricate shapes without adding proportional stresses to the workpiece. It also facilitates better weldability.

A host of alloying elements can improve the chemical properties. These elements will affect the physical/chemical properties favourably and make the final product suitable for the application. The elements that may be added include chromium (Cr), cobalt (Co), phosphorus (P), sulphur (S), and manganese (Mn), among others.

For instance, chromium imparts corrosion resistance and increases mild steel’s hardness. In its pure form, mild steel will rust easily due to oxidation. Unlike iron oxide, chromium metal on exposure to the atmosphere forms a dense layer of chromium oxide that does not fall off and ultimately protects the metal underneath from further corrosion attacks.

Copper in limited quantities also works like chromium oxide. Mild steel pipes may be galvanised for better protection from the atmosphere.

Other elements may be added to improve wear resistance, ultimate tensile strength, and heat resistance.

Physical Properties of Mild Steel

Its impressive properties are responsible for growing use in a variety of industries. Some mild steel’s physical properties are as follows:

  • High tensile strength
  • High impact strength
  • Good ductility and weldability
  • A magnetic metal due to its ferrite content
  • Good malleability with cold-forming possibilities
  • Suitable for various heat treatment options to improve properties

Applications and Use-Cases

It would not be an exaggeration to say that if you looked out your window, you would see something made from mild steel. It is the most common type of metal used around us.

From buildings to massive sea-going vessels, there is mild steel involved. Some of the applications are as follows.

Construction

In construction, there is a need for materials that can be joined easily and are able to withstand changing loads. Mild steel, therefore, is the perfect material for extensive use. Some grades of mild steel are actually called structural steels for that reason.

It also meets strict seismic and wind requirements, cannot be damaged by insects and is resistant to rot and fire.

The fact that it is relatively cheaper compared to other steels doesn’t hurt either. Mild steel is therefore used in structures big or small, from bridges to buildings.

Machinery Applications

Mild steel is widely used in machinery and automobile manufacturing. It is cheap, suitable for different cutting and coating methods and has good weldability while providing good enough physical properties. These attributes make it useful for producing frames, panels, etc.

Pipelines and Poles

The excellent ductility of mild steel has made it the perfect contender for the manufacturing of pipelines and poles that need to weather extreme atmospheres.

While mild steel pipes can be easily welded to each other, they also retain a certain degree of flexibility. As the pipelines may shrink in cold weather or expand on hot days, this is a necessary feature for the metal.

Cutlery and Cookware

While previously the exclusive domain of stainless steel, modern-day chefs are coming to love mild steel cookware more and more because of some of the advantages it offers.

The cutting equipment stays sharp for a longer time, has a higher temperature limit and can be modified to become a non-sticking material.

Seasoning the metal helps to overcome the factor of corrosive wear.

Fencing

Mild steel can be shaped into incredibly specific shapes which makes it perfect to be used in fencing. It also is visually appealing, so it looks beautiful besides being functional.

Mild steel may also be galvanised or coated with the right paint to make it long-lasting and rustproof.

Common Grades

The following are some of the widespread mild steel grades. A common denominator for all of them and other similar metals is their universal nature. Their properties make them a popular choice for a wide range of applications.

EN 1.0301

Equivalent grades: AISI 1008; C10; DC01

EN 1.0301 carbon steel contains 0.1% carbon, 0.4% manganese and 0.4% silicon. It also contains small amounts of copper (Cu), nickel (Ni), chromium (Cr), aluminium (Al), and molybdenum (Mo).

This grade has excellent weldability and is commonly used for extruded, forged, cold headed, and cold-pressed parts and forms. It is primarily used in automotive equipment, furniture, and appliances.

EN 1.1121

Equivalent grades: AISI 1010

EN 1.1121 carbon steel contains carbon in the range of 0.08% to 0.13%. Manganese is present in the range of 0.3% to 0.6%. It is used in the manufacturing of cold headed fasteners and bolts.

This mild steel grade also has good formability and ductility and can be formed using traditional methods. It also supports joining by practically all the welding techniques. Its strength may be improved by heat treatment, such as quenching and tempering, but the cost of carrying out these processes is rather high.

It is a general-purpose steel largely present in various structures and the automotive industry.

EN 1.0402

Equivalent grades: AISI 1020; C22

This grade of steel has excellent weldability. EN 1.0402 is especially suitable for carburised parts. It also has a good balance between ductility, strength and toughness.

It has a carbon content from 0.18% to 0.23% with a manganese content range of 0.3% to 0.6%. Compared to EN 1.1121, it is not used as commonly but it does have great machinability in its as-forged condition.

This grade finds use in machinery in the form of hydraulic parts and camshafts.

 

Fractory offers metal fabrication services, such as laser cutting, sheet metal bending and CNC machining, for a wide range of low-carbon steels. If you don’t find the material grade you need on our platform, please contact our sales engineers since they are most likely still able to accommodate your needs.

4 Advice to Choose a Mild Steel Material

Mild Steel – All You Need to Know

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