Schematic diagram of a basic oxygen furnace and an electric arc furnace, not actual photos from the customer's steel plant
Today, a foreign customer asked us about the steelmaking method used by the steel plant when discussing a customized material: Is it an electric furnace or a basic oxygen furnace?
This question deserves a serious answer. For customized materials, understanding how they are produced is inherently part of technical communication.
However, this question can easily lead to a misunderstanding: Does knowing the type of furnace alone determine whether the steel is good or bad?
To start with the conclusion: Basic oxygen furnaces and electric arc furnaces refer to the methods of steelmaking, not the quality grade of the steel. To distinguish between them, first look at two things: what is put into the furnace, and where does the heat for steelmaking come from?
Basic Oxygen Furnace: Receives hot molten iron and further refines its composition
The principle of the basic oxygen furnace: Primarily uses molten iron, supplemented with scrap steel, and refines the composition through oxygen blowing
A basic oxygen furnace typically does not directly process iron ore; instead, it receives high-temperature molten iron already produced in a blast furnace and then adds some scrap steel.
However, just because the iron has been melted into liquid form doesn't mean it is the steel we need. Its carbon content is usually quite high and requires further adjustment.
The key operation in a basic oxygen furnace is blowing oxygen into the furnace. The oxygen reacts with elements such as carbon in the molten iron, reducing the carbon content and working with slag to remove some impurities.
Interestingly, these reactions themselves release a large amount of heat, helping maintain the smelting process and even melting the added scrap steel. Therefore, a basic oxygen furnace should not be simply understood as "a big pot that melts iron." It mainly builds on the existing hot molten iron to further refine its composition. Reference for the steelmaking process
Electric Arc Furnace: Uses electric arcs to provide high temperatures to melt and refine metal charges
The principle of the electric arc furnace: Graphite electrodes generate electric arcs to supply heat for melting and refining metal charges
The electric furnace referred to here primarily means the electric arc furnace used for steelmaking.
Anyone who has seen arc welding knows that electric arcs are very bright and extremely hot. Electric arc furnaces also utilize the high temperature generated by electric arcs, but on a different scale, with different equipment and purposes: They use electrodes to create electric arcs, melt metal charges, and complete preliminary refining.
However, electric furnaces do not only perform the single action of "melting by electricity"; they also control chemical composition and handle impurities. Modern electric furnaces may also use other auxiliary energy sources. Reference for steelmaking routes
In short, remember the main difference: A basic oxygen furnace mainly processes hot molten iron and refines the steel through oxygen blowing; an electric arc furnace primarily uses electric arcs to provide heat and handles more flexible combinations of metal charges.
Does using scrap steel necessarily mean inferior steel?
The term "scrap steel" easily evokes associations with "waste." However, in steel plants, it is a reusable metal raw material, and "recycling" should not be equated directly with "poor quality."
Moreover, electric furnaces do not always use only scrap steel; they can also process direct reduced iron obtained from iron ore, pig iron, or molten iron. Similarly, basic oxygen furnaces also use scrap steel. Dividing them into "one uses new material, the other uses waste" is inaccurate. World Steel Association: Steelmaking Raw Materials
What truly matters is: Is the source of the charge clear? Are the ingredients appropriately combined? And is subsequent control properly implemented?
This is like dining at a restaurant. You wouldn't judge whether the meal is delicious simply by asking "what kind of pot is used in the kitchen." The ingredients, the chef's skill, and the control over each step all influence the final result.
The same applies to steelmaking. Each type of furnace has its own characteristics, but none can replace comprehensive quality control throughout the entire production process.
For those using steel, what ultimately matters?
The molten steel coming out of either a basic oxygen furnace or an electric arc furnace cannot be directly used to make screws. There are still subsequent steps such as refining, casting, and rolling, tailored to product requirements. If any one of these stages is poorly controlled, it could affect the final material delivered to the customer.
Therefore, for cold-heading companies, knowing "which furnace was used" is worth understanding, but the more practical question is: Can this batch of material meet product requirements, and can it be processed consistently and reliably?
Returning to our customer's question, we first need to accurately confirm the steel plant's actual production route, then discuss based on the customer's specific application and requirements, rather than immediately debating which furnace is "superior." We should also further verify whether the customer has specified a particular route.
The furnace type is one clue for understanding the material, but it is not a definitive stamp guaranteeing the material's quality.
Creation Group focuses not only on which furnace the steel comes from, but more importantly, whether it is suitable for actual processing once it reaches the customer's machinery.
If you encounter confusion during material selection—such as "same grade but different machining performance"—please feel free to share your product details and usage conditions with us for discussion.
The accompanying images are simplified schematic diagrams generated by AI and do not represent the actual equipment, operating conditions, or production routes of the customer's steel plant. Airflow, electric arcs, and sectional structures have been visualized; equipment proportions and details are not intended as engineering references.
This document is for review purposes only and has not been published on the website.