00:00We use tools every day, whether it's to fix things, make items or for many other purposes.
00:08But the thing is, the steel used in these devices is a bit different from the steel we usually use
00:14in everyday materials. Today we are going to talk about tool steel and what makes it
00:20such a special kind of steel. Today we are going to talk about a material that's present in
00:32practically every tool you use in your daily life, but that a lot of people don't really know what it
00:40is
00:40or why it's so special. We're talking about tool steel, that material that can cut, shape and form
00:49practically any other material without wearing out quickly. If you've ever wondered why a drill
00:56bead can pierce through solid metal hundreds of times without getting damaged, or how a pair of
01:02scissors can cut paper for years without losing its edge. The answer lies in understanding exactly
01:10what makes this material so extraordinary. First of all, we need to understand exactly what tool
01:17steel is and how it differs from regular steel. This type of steel is a special kind, which was
01:26specifically developed to be made into tools. Mouds and dyes, which require extreme hardness, wear
01:35resistance and precision. But what is the fundamental difference between regular steel and this special
01:42material? The answer lies in its chemical composition. While regular steel may have only 0.2 to 0.3 percent
01:51carbon,
01:52tool steel contains between 0.5 and 1.5 percent, which is a significantly higher amount. In addition,
02:02it receives careful additions of alloying elements, such as chromium, vanadium, molybdenum, tungsten and
02:10manganese, which give it superior mechanical properties. This combination of high carbon content
02:16with alloying elements is what makes this material so different. Now that we understand what this material is,
02:24let's explore what makes it so special. The first property that stands out in this steel is its
02:30extraordinary hardness. Hardness is the ability of a material to resist wear, abrasion and cuts,
02:38and that's exactly what you need in a tool. When you use a drill bit to drill through metal, the
02:46tip of
02:47the bit undergoes immense friction against the material being drilled. If the drill bit were made of regular
02:53steel, it would wear out quickly and lose its cutting ability. But with tool steel, the hardness is so high
03:01that the drill bit can maintain its shape and cutting edge for much longer. But hardness alone is not
03:08enough to make a material ideal for tools. If steel were only hard, it would be brittle and would break
03:15easily when subjected to impact or sudden load. That's where the second special property of this material
03:23comes in. Toughness is the ability of a material to resist impacts and cracks and it's what allows a
03:32tool not to break when you use it aggressively. Imagine pliers that are extremely hard but very brittle.
03:41If you apply too much force to the pliers to squeeze or hold something, they could break instantly.
03:47Now, with tool steel, you can combine hardness with toughness, creating a material that is hard but
03:54also flexible enough not to break easily. This delicate balance between hardness and toughness is one of
04:02the things that makes this steel so special and so suitable for tools. The third special property of
04:09this material is its wear resistance. Well, wear resistance is the ability of a material to maintain
04:17its properties even when it is constantly being rubbed against another material. When you use a cutting
04:25tool like a knitting cutter or a drill, it is constantly in contact with the material being machined
04:32and this contact causes wear. Tool steel has such high wear resistance that it can maintain its mechanical
04:40properties even after hours of continuous use. And this means that the lifespan of a tool made from
04:47this material is much longer than the lifespan of a tool made from regular steel. But how exactly does
04:54this material manage to have such superior wear resistance? The answer lies in its microstructure,
05:01which contains alloy carbides, rich in chromium and vanadium, offering exceptional resistance to sliding
05:08contact with other metals and abrasive materials. Another property that makes this steel so special is
05:16its ability to maintain its properties at high temperatures. When machining material with a high-speed cutting
05:24tool, the friction between the tool and the material generates intense heat.
05:30This heat can reach hundreds of degrees Celsius, and in regular steel this would cause a significant loss of hardness.
05:39But tool steel is able to maintain its mechanical strength properties even under high temperatures.
05:46This is especially important in applications like plastic injection molds, where the mold is constantly in
05:54contact with hot plastic. If the mold were made of regular steel, it would lose its hardness and start to
06:01deform over time.
06:04But with tool steel, the mold is able to maintain its shape and properties, even after years of use at
06:11high temperatures.
06:12But are there types and classifications for this tool steel?
06:17Yes, there are different types of tool steel.
06:21Each is designed for specific applications, and each has a different balance between hardness,
06:26toughness, and heat resistance. Cold work steels such as D2, O1, and A2 are designed for tools that operate at
06:38room temperature and require maximum
06:41hardness and wear resistance. D2, for example, D2 is one of the most popular for code cutting dies and machining
06:50because it offers excellent wear resistance.
06:54While O1 offers better toughness with slightly less hardness, make it ideal for applications where impacts are more frequent.
07:05Hot work steels like H13 are designed for tools that operate at high temperatures and require a combination of hardness
07:14and heat resistance.
07:15High-speed steels such as M2 and M42, known as HSS, or high-speed steels, are designed for cutting tools
07:29that operate at high speeds and temperatures, such as drills and milling cutters.
07:34To understand where it's best to use a certain type of steel, you need to understand the tool's working conditions.
07:42And choose a material that has the right balance between hardness, toughness, and heat resistance for that specific application.
07:50Precision is another characteristic that makes this material so special.
07:55When you manufacture a tool, you need it to have exact dimensions and very specific tolerances.
08:02If a drill bit has a diameter that's even slightly different from what's specified, it won't drill a hole the
08:09right size.
08:09Tool steel can maintain those dimensional tolerances with extraordinary precision,
08:16because it doesn't undergo significant deformation during the manufacturing process and use.
08:22In addition, it can maintain a much sharper cutting edge than regular steel,
08:29which allows the tool to make more precise cuts and achieve a better surface finish.
08:34Have you ever stopped to think about how a drill bit can make a hole with a tolerance of just
08:40a few thousands of a millimeter?
08:42This is only possible because tool steel can maintain its shape and cutting edge with extraordinary precision.
08:50So, the next time you pick up a tool, know that the steel it uses is different from the regular
08:56steel we know.
08:58All of this is to deliver the precision engineering, strengths, and performance that that specific tool needs to provide.
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09:27So, did you already have any idea about all this complexity involved in the properties of the steel used in
09:34tools?
09:36Have you ever stopped to think about how the tools you use can be so durable and resistant?
09:43Or maybe you've used some cheap tool out there that wasn't made using the correct steel specifications for its intended
09:50use?
09:51Tell me your story here in the comments.
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09:59and explore your curiosity.
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10:07That's it, engineering lovers. Big hug, and I'll see you in the next video.
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