2024/01/20
Hand Tool Design Guide
Why the Source of Steel Materials Matters?
In the world of engineering, choosing the right material for hand tools goes beyond a simple selection. It's about matching the tool's purpose with its performance abilities.How much torque can the tool withstand and how hard are the materials it will
encounter? These aren't just technical considerations; they're the essence of tool design.
The choice of material, especially steel, plays a pivotal role here. To be more specific, the selection of steel types primarily considers the following aspects:
The choice of material, especially steel, plays a pivotal role here. To be more specific, the selection of steel types primarily considers the following aspects:
Hardenability: How do we know how hard this material can get? Diverging slightly, according to material science textbooks, the focus is not on hardness but on the quantity ofmartensite formed after quenching. The capacity
to form more or less martensite can also be seen as the material's ability to harden easily. Greater hardenability means the steel can harden deeper during quenching. However, many factors affect the hardenability of steel, such as grain size, carbide distribution,
compositional uniformity, and chemical composition of the steel. Engineers evaluate the steel's 'hardenability curve' against the dimensions and desired post-tempering hardness of the workpiece to gauge the steel's hardening effectiveness.
(Jominy Curve Source: https://www.sciencedirect.com/)
Materail Chemical Composion: Consider the additional properties that alloy elements can impart to the workpiece. What are these additional properties?
Those familiar with RPGs know that the swords wielded by heroes have cool names and many additional effects, like the "Spartan's Exclusive Spear." Similarly, the materail composition we talk about here are somewhat analogous (maybe...)
(Source: Diable 3, The Three Hundredth Spear )
Those familiar with RPGs know that the swords wielded by heroes have cool names and many additional effects, like the "Spartan's Exclusive Spear." Similarly, the materail composition we talk about here are somewhat analogous (maybe...)
(Source: Diable 3, The Three Hundredth Spear )
So, what are the Materail Chemical Composion?
It's the solution (and always that solution) in current steel alloy materials: adding elements.
For instance, if wear resistance is needed, molybdenum can be added; nickel is added for toughness; silicon and vanadium are considered for torque requirements.
Quick examples from the textbook:
Silicon (Si): Provides a strong solid solution strengthening effect, increasing the workpiece's torque characteristics.
Manganese (Mn): Offers basic strength after tempering.
Nickel (Ni): Increases hardenability and improves toughness through fine grain effect.
Chromium (Cr): Provides basic strength after tempering.
Molybdenum (Mo): Enhances hardenability and improves fatigue life and wear resistance through precipitation strengthening.
Vanadium (V): Increases hardenability and resistance to torsional deformation through precipitation strengthening.
In fact, when making hand tools, the selection of materials also involves commercial considerations, such as low cost, because if it's too expensive, no one can afford it...
The material must be stable; it's not acceptable for each batch to be different. The heat treatment plant manager life would become very miserable. Also, for large-scale demand, the delivery period must be short. For small-scale demand, a variety of sizes
must be available. (Taiwan CSC says: are we 7-Eleven or Costco?)
This is also why Tien-i engineers continue to choose Taiwanese-made materials, mainly from the Taiwan CSC, the best steel maker from Taiwan.
Although Taiwanese steel is not the cheapest, we do not want to provide our customers with products that vary greatly in hardness from batch to batch, or have very unstable torque performance. Many cheap foreign steels are actually 'you get what you pay
for', and it's hard to tell if they lack precious alloy elements. (You say the factory has material certifications? That's another story.)
Considering the stable life span, high torque, high hardness, and high toughness of the product, we continue to insist on providing the most stable and cost-effective Taiwanese steel-made hand tools.
For more information about Tien-i socket made of quality materail, feel free to click the button below to contact us: