Desktop Metal announced the qualification of Grade 420 stainless steel (420 SS) for use on the Production System platform, which leverages patent pending Single Pass Jetting (SPJ) technology designed to achieve the fastest build speeds in the metal additive manufacturing industry. Manufacturers can now leverage SPJ technology for the mass production of high-strength, end-use parts in 420 SS for demanding applications in industries such as medical, aerospace, defense, and consumer products.
A martensitic heat-treatable stainless steel, 420 SS is characterized by its high strength and hardness as well as its corrosion resistance to the atmosphere, foods, fresh water, and mild acids when in a fully hardened condition. 420 SS is a common material used extensively across a variety of applications such as surgical and dental instruments, ball bearings, gear shafts, pump and valve components, fasteners, gauges, hand tools, and high-end cutlery.
“Engineers continue to seek out metal additive manufacturing as a leading option to drive innovation in design and manufacturing,” said Jonah Myerberg, CTO and co-founder of Desktop Metal. “We believe our qualification of 420 SS and other high-strength alloys will accelerate the deployment of our AM 2.0 solutions among customers looking to successfully mass produce critical parts at scale.”
420 Stainless Steel – key applications
Desktop Metal’s materials science team has qualified and fully characterized 420 SS printed on Production System technology that meets MPIF 35 standards for structural powder metallurgy parts set by the Metal Powder Industries Federation. Parts printed in 420 SS on the Production System platform eliminate the use of tooling and minimize material waste, as well as represent a significant decrease in production time and part cost compared to conventional manufacturing methods.
Examples of key applications include:
• Medical/Surgical – locking articulation bar
Robotic surgical systems used in a variety of medical procedures provide surgeons a better range of motion, enhanced visibility, and a level of precision unachievable with manual surgeries. These systems feature highly precise motion systems with many small intricate parts. The Production System offers high-resolution binder jet printing, making it an ideal solution for achieving the fine features required of robotic surgical instruments. For components like locking articulation bars, 420 SS is a desired material for its high hardness and excellent corrosion resistance. Since no tooling is required to produce these parts with binder jetting on the Production System, volume production can begin as soon as the design is complete, saving valuable time and money on large non-recurring costs of tooling design and fabrication.
• Aerospace – valve nozzle adapter
Valve nozzle adapters connect nozzles with fluid systems in aerospace applications, where multiple versions of these adapters are often required to accommodate various nozzle geometries and sizes. Engineers prefer 420 SS for this type of adapter because of its excellent corrosion resistance and high hardness. With capacity for thousands of adapters in a single build, the Production System can support the manufacturing of these components in 420 SS in volumes competitive with conventional manufacturing methods. In addition, with no tooling required, numerous adapter geometries can be printed within a single build, saving lead time and costs associated with changing over tooling in conventional manufacturing processes.
• High-volume manufacturing – Twin screw extruder mixing elements
Twin screw extruder mixing elements are used for mixing, compounding and processing viscous materials. These parts feature complex lobes around the exterior of the spline that must be optimized for the material being extruded, necessitating a unique mixing element for each different material. With conventional manufacturing, each of these elements can be complex to produce, often requiring advanced machining techniques, multiple machining setups, and custom fixturing. Binder jetting with the Production System simplifies the manufacturing process, enabling large volumes of several, unique mixing elements to be printed in each build, reducing the cost and lead time of production compared to machining. 420 SS is an essential material in these applications for its high hardness and corrosion resistance, ensuring the elements have a long lifetime and the hardness required for extruding a wide variety of materials.
Created by the inventors of binder jetting and single-pass inkjet technology, the Production System is an industrial manufacturing platform powered by Desktop Metal’s Single Pass Jetting technology. It is designed to achieve speeds up to 100 times those of legacy powder bed fusion additive manufacturing technologies and enable production quantities of up to millions of parts per year at costs competitive with conventional mass production techniques. The P-50 printer is paving the way for the mass production of end-use parts — unlocking throughput, repeatability, and competitive part costs.