Author: Scott Bredemann | Updated: 02/7/2025
This is one of the most commonly used low-carbon steels due to its balance of machinability, strength, and cost-effectiveness. It is very commonly used in fabricating components for machinery, constructing structural parts, or machining precision tools – so, understanding the properties and advantages of 1018 steel can help optimize your production process. This guide will help cover what 1018 steel is, its properties, typical applications in manufacturing, and how it compares to other commonly used steels.
What is 1018 Steel?
It is a low-carbon mild steel that belongs to the AISI 1xxx series of steels. Specifically, it contains approximately 0.18% carbon, which gives it its distinctive designation. Composed primarily of iron and carbon, with trace amounts of other elements, this steel is characterized by its:
It is produced through either the basic oxygen furnace (BOF) or electric arc furnace (EAF) process. These methods refine the raw materials, removing impurities and precisely adjusting the chemical composition. Once the steel is formed, it undergoes further processing:
- Hot-Rolled 1018 Steel: Heated above its recrystallization temperature and passed through rollers to achieve the desired shape. This process is cost-effective and provides good mechanical properties, though it results in a rougher surface finish.
- Cold-Drawn 1018 Steel: Processed at room temperature to enhance dimensional accuracy, surface finish, and mechanical strength. Cold-drawn 1018 steel is preferred for precision machining applications due to its improved properties.
Properties
| Property Name | Value |
| Tensile Strength (Minimum) | 440 MPa |
| Tensile Strength (Maximum) | 540 MPa |
| Yield Strength | 370 MPa |
| Elongation | 15-20 % |
| Hardness | 126-131 Brinell |
| Density | 7.87 g/cm³ |
| Melting Point | 1425-1510 °C |
| Thermal Conductivity | 51.9 W/m·K |
| Electrical Resistivity | 0.16 Ω·mm²/m |
| Magnetism | Good Magnetism |
As can seen from above – with a tensile strength of 440-540 MPa and good ductility (15-20% elongation), it’s strong enough for everyday applications without being overly rigid. Think of it as the “just right” porridge in Goldilocks – not too hard (126-131 Brinell), not too soft, and perfect for machining and welding. Its consistent 7.87 g/cm³ density and manageable melting point make it a reliable choice for manufacturers looking for a cost-effective, easy-to-work-with material.
Chemical Composition
| Element (Symbol) | Composition (%) |
| Iron (Fe) | ~98.79 – 99.24 |
| Carbon (C) | 0.15 – 0.20 |
| Manganese (Mn) | 0.60 – 0.90 |
| Phosphorus (P) | ≤ 0.04 |
| Sulfur (S) | ≤ 0.05 |
Best Manufacturing Uses
1018 steel is best used in applications that require good machinability, weldability, and moderate strength. Below are some of the most common uses for it:
- Precision machined parts – Its uniform composition allows for tight tolerances and smooth surface finishes.
- Shafts, pins, and gears – Frequently used for mechanical components that need consistency and reliability.
- Structural components – Suitable for low-stress construction applications.
- Fasteners and bolts – Provides a balance of strength and ease of fabrication.
- Cold-formed parts – Ideal for processes like bending, stamping, and rolling.
1018 Steel vs. Other Commonly Compared Steels
Below is a chart of 1018 vs. 1045 Steel, 4140 Steel, A36 Steel, and Stainless Steel (304/316):
| Steel Type | Carbon % | Tensile Strength (MPa) | Yield Strength (MPa) | Machinability | Primary Applications | Cost Relative to 1018 |
| 1018 | 0.18 | 440-540 | 370 | Excellent | General machining, mild components | Baseline |
| 1045 | 0.45 | 600-640 | 420 | Good | Machine parts, shafts, gears | 1.2-1.5x |
| A36 | 0.26 | 400-550 | 250 | Good | Structural construction | Similar |
| 4140 | 0.4 | 655-860 | 515 | Fair | High-stress machinery | 2-3x |
| Stainless 304 | 0.08 | 515-690 | 205 | Poor | Food processing, medical | 4-5x |
| 4340 | 0.4 | 745-1080 | 630 | Fair | Aerospace, high-performance parts | 3-4x |
If you’re looking for standard or custom parts made from 1018 steel, or if you have any questions about selecting the right steel for your application, our expert engineers are here to help. At MISUMI USA, we offer a wide range of steel components to meet your specific needs, whether for prototyping or full-scale production. Contact us today to learn more about our offerings and how we can support your manufacturing projects!