Author: Scott Bredemann
Updated: 08/22/2024
Steel stands as the backbone of modern manufacturing, omnipresent in industries ranging from construction to automotive and beyond. Its versatility and strength have propelled modern civilization forward, shaping our skylines and driving technological innovation. In this post, we delve into the intricacies of steel, exploring its definition, composition, types, properties, and myriad of applications – in particular how it relates to manufacturing.
Steel Defined
What is Steel? Steel is an alloy of iron and carbon. Unlike iron, which is brittle and prone to rust, steel contains a specific amount of carbon (usually less than 2%) that grants it superior strength, ductility (the ability to be shaped without breaking), and resistance to corrosion.
How is Steel Made?
Traditionally, iron ore is crushed, mixed with other materials, and fed into a blast furnace. Intense heat separates the iron from impurities, resulting in molten “pig iron” with too much carbon. This molten iron is then transferred to a Basic Oxygen Furnace (BOF) where pure oxygen burns off the excess carbon and allows for the addition of elements like chromium or nickel for specific properties. Finally, the refined steel is cast into molds for further shaping.
However, a more eco-friendly method is gaining traction: the Electric Arc Furnace (EAF) route. Here, recycled steel scrap is melted in an EAF using electric arcs. Similar to the BOF route, the molten steel is then refined and cast. Both methods can involve additional shaping processes like rolling to create the final steel form. The future of steel production is also looking greener, with new technologies exploring ways to reduce its environmental impact by using renewable energy sources and capturing carbon emissions.
History of Steel
The story of steel stretches back millennia. The earliest evidence of steel production dates back to around 1800 BC, discovered in Anatolia (present-day Turkey). Back then, steel was likely an accidental byproduct of ironworking, where iron ore was heated in charcoal fires. These early ironworkers would have noticed that iron left in the furnace longer became harder and stronger – the birth of steel.
For thousands of years, steel production remained a slow and laborious process. However, civilizations around the world continued to refine techniques, leading to the development of different steel grades with varying properties. The famed Damascus steel used in sword making and Japanese katana owe their legendary sharpness to these advancements.
A breakthrough arrived in the 19th century with the invention of the Bessemer process. This method revolutionized steel production by allowing large quantities of steel to be produced cheaply. This ushered in a new era of steel’s dominance in manufacturing, forever changing the landscape of construction, transportation, and countless other industries.
Composition of Steel
Iron forms the foundation of steel, but it’s the carbon content that truly defines its properties. Low-carbon steel, with less than 0.3% carbon, is easily formed and welded. It’s commonly used in sheets for car bodies and appliances. Medium-carbon steel (0.3-0.8% carbon) offers a balance of strength and formability, making it suitable for gears and tools. High-carbon steel (above 0.8% carbon) prioritizes strength and is used in springs and cutting tools. Additionally, other elements like manganese, chromium, and nickel can be added to create specific properties like increased rust resistance (stainless steel) or high strength-to-weight ratios (alloy steels) for demanding applications.
| Element | Percentage Composition Range |
| Iron | 98% |
| Carbon | 0.2% – 2.1% |
| Manganese | 0.5% – 1.5% |
| Silicon | 0.5% – 0.3% |
| Chromium | 0.2% – 0.3% |
| Nickel | 0.2% – 0.3% |
| Others | < 0.5% |
Types of Steel
The most common classification system for steel is based on carbon content, as mentioned earlier. However, there are other ways to categorize steel. Alloy steels incorporate additional elements besides carbon for specific functionalities. Stainless steels, for example, contain chromium for superior corrosion resistance.
| Type of Steel | Iron | Carbon | Manganese | Silicon | Chromium | Nickel | Key Property |
| Low Carbon Steel | 98% | 0.05% – 0.30% | 0.25% – 0.60% | 0.15% – 0.30% | < 0.30% | – | High Formability |
| Medium Carbon Steel | 98% | 0.30% – 0.60% | 0.60% – 1.65% | 0.15% – 0.30% | < 0.30% | – | Increased Strength |
| High Carbon Steel | 98% | 0.60% – 1.5% | 0.60% – 1.65% | 0.15% – 0.30% | < 0.30% | – | High Hardness |
| Stainless Steel | 70% – 80% | 0.05% – 1.2% | 1.2% – 2.0% | < 1.0% | 10.5% – 30% | 8.0% – 30% | Corrosion Resistance |
| Tool Steel | 98% | 0.70% – 1.4% | 0.20% – 1.0% | 0.15% – 1.0% | 4.0% – 20% | Molybdenum, Vanadium |
Properties of Steel
Steel’s dominance in manufacturing stems from its combination of desirable properties. Its high strength allows it to withstand significant loads without breaking. Its ductility allows it to be shaped into various forms, while its toughness ensures it can absorb impact without shattering. Additionally, steel offers good thermal conductivity, making it suitable for applications involving heat transfer. The specific properties will vary depending on the steel’s composition.
| Type of Steel | Strength | Ductility | Hardness | Corrosion Resistance | Wear Resistance | Machinability |
| Low Carbon Steel | Low to Medium | High | Low to Medium | Low | Low | High |
| Medium Carbon Steel | Medium to High | Medium | Medium to High | Low | Medium | Medium |
| High Carbon Steel | High | Low | High | Low | High | Low |
| Stainless Steel | High | Low to Medium | High | High | Moderate | Moderate |
| Tool Steel | High | Low | Very High | Moderate | Very High | Moderate |
Applications of Steel in Manufacturing
The applications of steel in manufacturing are truly vast. In construction, steel forms the framework of buildings, bridges, and infrastructure projects. Transportation relies heavily on steel for car bodies, ship hulls, and airplane components. Everyday appliances like refrigerators, washing machines, and ovens utilize steel for their durable structures. The list goes on – machinery, tools, medical devices, and pipelines all benefit from the unique properties of steel.
Gauges of Steel – Thickness Chart
| Application | Description |
| Automotive | Body panels, chassis, engine components |
| Construction | Structural beams, columns, reinforcement bars |
| Machinery | Shafts, gears, bearings, machine components |
| Appliances | Refrigerators, ovens, washing machines |
| Tools | Hand tools, power tools, cutting blades |
| Shipbuilding | Hulls, decks, bulkheads |
| Aerospace | Aircraft frames, landing gear, engine components |
| Infrastructure | Bridges, pipelines, railways |
| Energy | Wind turbines, oil rigs, power plant structures |
| Packaging | Cans, containers, packaging materials |
Parting Thoughts
Steel’s versatility, strength, and affordability make it an irreplaceable material in the manufacturing world. As technology advances, steel production is constantly evolving towards increased sustainability and efficiency. Steel will undoubtedly remain a crucial building block for shaping the future of manufacturing.
At MISUMI USA, we pride ourselves on providing a wide range of customizable components crafted from high-quality materials, including steel, and steel variants like 18/10 steel, and 4140 alloy steel. Whether you’re searching for precision shafts, linear guides, or structural frames, our products are designed to meet the exact specifications of your application.
Explore our extensive catalog of metal components and materials to discover how MISUMI USA can help bring your vision to life with precision and reliability. With our global manufacturing capabilities and commitment to quality, we ensure that your projects are built on a foundation as strong and enduring as steel itself.