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The VMT blog is dedicated to sharing our hard-earned knowledge in prototype manufacturing. We hope these articles will help you optimize your product designs and gain deeper insight into the world of rapid prototyping. Enjoy the read!
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2026 03 05 Both 420 and 440 are martensitic stainless steels characterized by high hardness, excellent wear resistance, and good corrosion resistance. As martensitic grades, both can be strengthened through heat treatment to enhance their hardness and durability. However, their specific chemical compositions lead to distinct differences in performance—particularly in hardness and corrosion resistance—which in turn affects their cost and typical applications. Even though both 420 and 440 are widely used for precision bearings and machine components in CNC machining projects, as well as for blades and surgical instruments, they serve different needs. In this article, you can learn about how the composition of these two steels impacts their properties, compare their core characteristics, and analyze the differences in machining difficulty and cost.
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VMT 2026 03 04 This article will guide you through the core properties (properties) of 308 stainless steel and the reasons behind them. Additionally, you will learn about its cost, applications, machining , and its pros and cons.
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VMT 2026 03 03 The key characteristic of 446 stainless steel is its exceptional high-temperature oxidation resistance, that is—If you are looking for a material for high-temperature nozzles, exhaust manifolds, or specialized cookware. Specifically one that offers extreme heat resistance combined with moderate strength, reliable corrosion resistance, and a manageable cost—then this guide to 446 stainless steel is for you. But if you are looking for standard room-temperature applications— projects requiring higher mechanical strength or corrosion resistance, 446 stainless steel may not be the most cost-effective or high-performing choice.
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VMT 2026 03 02 Austenitic stainless steel stands as the most versatile and widely used family of corrosion-resistant alloys. For example, the most well-known 304 and 316 stainless steel that you must have heard—they belong to the austenitic families. Accounting for over 70% of total stainless steel production globally, these materials are made into so many parts, components, or products of industries ranging from food processing and medical devices to aerospace and chemical engineering. Whether you are an engineer selecting materials for a design or manufacturing need or a machinist looking to optimize your CNC processes, understanding the nuances of austenitic stainless steels is necessary and helpful. In this comprehensive guide, you will explore the chemical composition, key properties, common grades, and the specific challenges of machining the austenitic stainless steels.
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VMT 2026 03 01 For a wide range of electronic products, an enclosure serves as much more than just a physical barrier to protect against dust, impacts, or scratches. While these functions are undoubtedly essential, there is another critical requirement that cannot be overlooked: managing the signal interference—both emitted and received—by the electronic components within. This is precisely why aluminum for CNC-machined electronic enclosures are so highly sought after; aluminum as a material naturally possesses excellent electromagnetic shielding properties. Electromagnetic shielding is not limited to electronic enclosures; it is a vital consideration in many uses from aerospace components designed to prevent radar interference to the infrastructure of telecommunication base stations or for precision medical equipment. Understanding the basics of electromagnetic shielding, good shielding materials, and recognizing the unique advantages of CNC machining in producing metal components with good shielding capabilities will provide values for your engineering design and manufacturing requirements.
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VMT 2026 02 28 At a quick glance, you might find it impossible to distinguish between 440C stainless steel and 304 stainless steel. They both possess that classic metallic luster associated with “typical stainless steel appearance". However, beneath the surface, these two stainless steels are worlds apart. Their chemical structures and composition, mechanical properties, ways of increasing strength and hardness, and cost profiles are quite different.
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VMT 2026 02 27 Machinability of a material influences whether the material being machined into the parts is easy or not. For example, the free cutting brass (UNS C36000) has excellent machinability, with a machinability rating of 100%; that is, the machinability rating of all other copper-based alloys, and even steel, is based on this standard. Thus, this 100% machinability rating UNS C36000 brass is quite excellent for high-speed CNC machining and automatic lathes due to its low cutting resistance; This results in very short and brittle chips, making it easy to manufacture various parts. But for some easy to be confused concepts like machinability vs. formability vs. workability, how is machinability measured, factors influencing machinability, and common metals' machinability rating, these questions are what this article shares about.
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VMT 2026 02 26 From kitchenware(like SS304 containers or SS401 knives), to automotive components(like SS304 exhaust piping or SS401 gears), stainless steel 401 and 304 are two popular materials among many industries; But if you look at their physical appearance, you can hardly tell these two stainless steels. Stainless steel 401 and 304 belong to entirely different families—martensitic and austenitic—and chemical composition are also different ; these lead to vast differences in magnetism, hardness, heat resistance, cost ,etc. This article will give you a comprehensive understanding of what the 401 and 304 stainless steels are and their key differences in properties, environmental performance, and cost efficiency.
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