Use of Recycled Stainless Steel in Drinkware Industry

Recycled stainless steel is increasingly common in the drinkware industry. Many premium brands such as HydroFlask, Klean Kanteen now use 90% recycled 18/8 (304 grade) stainless steel for insulated tumblers, water bottles, and flasks. Because of that, more and more clients have started looking at recycled stainless steel as a material option as opposed to non-recycled stainless steel (also called virgin stainless steel). In this post, we will address the most common questions asked by clients about the use of recycled stainless steel in drinkware.

What is Recycled Stainless Steel?

Recycled stainless steel is a material produced by melting down scrap metal—such as industrial offcuts, old machinery, or used consumer goods—and refining it back into high-quality alloys.

The industry is categorized into two types:

• New Scrap (Industrial Offcuts): Materials remaining from factory cutting and stamping operations (characterized by cleanliness and stable chemical composition).
• Old Scrap (Post-consumer Waste): Discarded home appliances, construction waste, old kitchenware, etc. (characterized by complex chemical composition and requiring rigorous sorting).

The Manufacturing Process of Recycled Stainless Steel

The process follows these core stages:

1. Collection and Sorting
   • The journey begins with the collection of scrap. This is the most critical phase because stainless steel comes in various grades (e.g., 304, 316, or 430).
   • Source: Scrap is gathered from industrial offcuts, old appliances, construction debris, and decommissioned vehicles.
   • Sorting: Using high-tech sensors, X-ray fluorescence (XRF) analyzers, and large magnets, the scrap is separated by its chemical composition. For instance, 300-series steel (which contains nickel) is separated from 400-series (which does not).
2. Shredding and Preparation
   • To speed up the melting process, the sorted scrap is fed into massive shredders. It is broken down into smaller, uniform pieces. This increase in surface area allows for more even heating and easier removal of any non-metallic impurities through magnetic or air-current separation.
3. Melting in the Electric Arc Furnace (EAF)
   • The scrap is placed into an Electric Arc Furnace. Unlike virgin steel production, which often uses a blast furnace fueled by coal/coke, the EAF uses high-voltage electricity to create an arc between carbon electrodes.
4. Refining and Decarburization (AOD/VOD)
   • Once molten, the steel must be “fine-tuned” to ensure it meets exact specifications.
   • Argon Oxygen Decarburization (AOD): Argon and oxygen are blown into the molten metal to reduce carbon levels without oxidizing the valuable chromium.
   • Alloying: If the recycled batch is slightly low on specific elements (like Nickel or Molybdenum), small amounts of virgin alloys are added to bring the mixture to the precise grade required (e.g., ensuring a 24oz tumbler meets 18/8 standards).
5. Casting and Forming
   • The refined molten steel is then cast into solid shapes.
6. Finishing
   • The final stage involves pickling (removing surface impurities with an acid bath) and annealing (heat-treating the steel to relieve internal stresses and improve ductility). This ensures the recycled steel has the same shiny, corrosion-resistant finish as virgin material.

Is Recycled Stainless Steel Inferior to Virgin Material?

The answer to this question depends on the grade, sorting, and refining processes used when producing the recycled stainless steel.

• If the production process is legitimate (follows the right conduct of sorting, refining and finishing stages, etc.), then the recycled stainless steel would have the identical performance characteristics (corrosion resistance, strength, and durability) to those of virgin steel. When looking at vacuum insulation efficiency of stainless steel drinkware, a vacuum-insulated bottle made from legitimate recycled stainless steel will maintain temperature just as effectively as one made from virgin steel.
• On the other hand, if the process does not follow the right conduct, then the output recycled stainless steel product could have inferior qualities such as high manganese content, poor corrosion resistance, etc.
• Therefore it is important to use recycled stainless steel that meets RCS (Recycled Claim Standard) and GRS standard (Global Recycled Standard).

Food Safety of Recycled Stainless Steel

304/316 grade recycled stainless steel have identical food safety standards as 304/316 virgin stainless steel. Both are non-reactive, BPA-free, and do not leach chemicals into beverages.

Is Recycled Stainless Steel Widely Used in Stainless Steel Drinkware Industry?

The use of recycled stainless steel is more common in high-end brands of the drinkware industry, as opposed to smaller brands. Many premium brands now use 90% recycled 18/8 (304 grade) stainless steel for insulated tumblers, water bottles, and flasks. Manufacturers often stamp a “Recycled” logo or the “90%” mark on the bottom of the vessel to distinguish it from virgin counterparts.

Why Use Recycled Stainless Steel to Manufacture Drinkware

Drinkware consumers no longer just want their bottles to be “reusable”, they also care about durability and sustainability. A broken reusable water bottle that ends up in a landfill is seen as a failure of the sustainable promise.

Unlike many other materials, stainless steel is “permanently” recyclable, meaning it can be processed indefinitely without losing its structural integrity. Furthermore, the total energy required to produce recycled stainless steel is roughly 1/3 of what is required for virgin steel, which means by using products made of recycled stainless steel, consumers can reduce their carbon footprint.

Differences Between Recycled Stainless Steel And Virgin Stainless Steel (Stainless Steel Bottle Manufacturer Perspective)

Feature	Non-recycled Stainless Steel (Virgin) Material	Recycled Stainless Steel Material
Material Cost	Market standard	5%~10% cheaper
Strength	High, predictable grain structure	High, identical to virgin material
Emissions	High (Extraction + Smelting)	Low (minimal extraction)
Health safety	Excellent (non-reactive, BPA-free)	Excellent (non-reactive, BPA-free)

As a stainless steel drinkware manufacturer since 2013, Packshine has the expertise and know-how in all aspects of manufacturing stainless steel water bottles. We warmly welcome any questions or inquiries!