The stainless steel of tomorrow. Available Today.
Circle Green brings you the first full-scale stainless steel product line achieving below one tonne CO2 emissions per tonne of stainless steel1, making market-leading sustainability immediately accessible across various grades.
1Outokumpu Circle Green® Dura <1.3t CO2/t
Circle Green® is the world’s first towards zero carbon stainless steel. It has the lowest carbon footprint in the industry.
Circle Green Moda 430/4016 is a classic 16% chromium ferritic stainless steel. Good corrosion resistance in mildly corrosive environments combined with good formability have made this product one of the most used non-hardenable ferritics, especially in indoor environments.
Circle Green® is the world’s first towards zero carbon stainless steel. It has the lowest carbon footprint in the industry.
Circle Green Moda 410L/4003 is a weldable ferritic stainless steel with elevated yield strength and resistance to abrasion. Its better corrosion resistance compared to carbon steels enables lower maintenance costs and longer service life.
Outokumpu Circle Green Moda 410L/4003 is a low-chromium structural ferritic stainless steel. Its corrosion resistance is limited in applications with increased corrosiveness. Circle Green Moda 410L/4003 can, however, replace carbon steel in many structural applications. When some discoloration in more aggressive environments is not acceptable, Circle Green Moda 410L/4003 may be painted.
Circle Green® is the world’s first towards zero carbon stainless steel. It has the lowest carbon footprint in the industry.
Moda 409/4512 is a weldable ferritic stainless steel with good oxidation resistance in dry air. This product is also available as low-carbon Moda 409L. Its corrosion resistance is limited in applications with increased corrosiveness. Because of its titanium alloying, Moda 409/4512 can be welded in all dimensions without becoming susceptible to intergranular corrosion. It is possible to use Moda 409/4512 in high-temperature applications, for instance in automotive exhaust systems, where it is often used to replace aluminium-coated carbon steel.
Circle Green® is the world’s first towards zero carbon stainless steel. It has the lowest carbon footprint in the industry.
Circle Green Core 304/4301 is a classic 18% chromium, 8% nickel austenitic stainless steel. It’s an all-purpose product with good corrosion resistance and is suitable for a wide variety of applications that require good formability and weldability. Circle Green Core 304/4301 can be delivered with a variety of surface finishes.
Circle Green Core 304/4301 is an austenitic stainless steel, which belongs to the standard CrNi stainless steel family. Circle Green Core 304/4301 is the basic variant with normal carbon and nickel content.
The austenitic CrNi standard grades are the most widely used group of stainless steels. Their well-balanced material properties make them suitable for the fabrication of many products.
Circle Green Core 304/4301 is commonly available from many stainless steel stockists in many product forms and dimensions. It can be supplied with a wide range of functional and aesthetic surface finishes.
Circle Green® is the world’s first towards zero carbon stainless steel. It has the lowest carbon footprint in the industry.
Circle Green Core 304L/4307 is a low-carbon alternative to Circle Green Core 304/4301. The lower carbon content minimizes carbide precipitation as a result of heat input, for example during welding, giving improved resistance against intergranular corrosion. It’s suitable for a wide variety of applications that require good formability and weldability, and can be delivered with a variety of surface finishes.
Circle Green Core 304L/4307 is an austenitic stainless steel that belongs to the standard CrNi stainless steel family.
The austenitic CrNi standard grades are the most widely used group of stainless steels. Their well-balanced material properties make them suitable for the fabrication of many products.
Circle Green Core 304L/4307 is commonly available from many stainless steel stockists in many product forms and dimensions. Circle Green Core 304L/4307 is also available in the temper rolled condition with higher strength.
Circle Green® is the world’s first towards zero carbon stainless steel. It has the lowest carbon footprint in the industry.
Circle Green Core 441/4509 is a nickel-free 17% chromium ferritic stainless steel originally designed for exhaust systems, with good corrosion resistance and high-temperature strength. Circle Green Core 441/4509 is available with a single (niobium) or dual (niobium and titanium) stabilizer. Due to good formability and weldability, it is often a suitable replacement for Core 301/4310.
Circle Green Core 441/4509 can be supplied with a wide range of functional and aesthetic surface finishes.
Circle Green® is the world’s first towards zero carbon stainless steel. It has the lowest carbon footprint in the industry.
Circle Green® is the world’s first towards zero carbon stainless steel. It has the lowest carbon footprint in the industry.
Circle Green Supra 316L/4404 is our most widely used molybdenum-alloyed austenitic stainless steel. Circle Green Supra 316L/4404 is a low-carbon stainless steel and is used in various process industries and other aggressive environments with higher than average corrosion resistance requirements. Due to its low carbon content, this product is also weldable in thicknesses of more than 5–6 mm/ 0.19–0.23 in without sensitivity to intergranular corrosion.
Circle Green Supra 316L/4404 is an austenitic stainless steel that belongs to the standard CrNiMo stainless steels. Grade Circle Green Supra 316L/4404 has low carbon content for improved resistance against intergranular corrosion after welding.
Due to their molybdenum content, the austenitic CrNiMo standard grades can be used in applications with increased demand for corrosion resistance. Their well-balanced material properties make them suitable for the fabrication of many products.
Circle Green Supra 316L/4404 is commonly available from many stainless steel stockists in many product forms and dimensions. It can be supplied with a wide range of functional and aesthetic surface finishes.
Circle Green® is the world’s first towards zero carbon stainless steel. It has the lowest carbon footprint in the industry.
Similar to 1.4110, but with elevated wear resistance. Applied especially for cutting instruments which undergo partial hardening for excellent wear resistance of functional surfaces.
How is Circle Green’s carbon footprint calculated?
We use our TÜV SÜD-verified and award-winning Product Carbon Footprint to calculate climate impact. The calculation considers all Green House Gas (GHG) emissions produced during the whole production chain (Scope 1,2,3), from cradle to gate.
Outokumpu is the first stainless steel producer worldwide to issue Product Carbon Footprint (PCF) certificates inline with ISO 14067. These certificates are based on a third-party verified methodology in accordance with ISO 14064-3, ensuring the highest level of transparency and credibility.
We even provide batch-specific CO2 figures for Outokumpu Circle Green. Green energy plays a significant role in the production of the low emission stainless steel, along with the use of special raw materials such as organic coke for ferrochrome production, and optimized scrap management.
This makes Circle Green the world’s first near-zero stainless steel. It has the lowest carbon footprint in the industry — a reduction of up to 93% when compared to the industry average.*) By choosing the most sustainable stainless in the world in your application, you can become a forerunner in your industry.
*) Outokumpu’s average product carbon footprint (2024): 1.6 kg CO₂e per kg of stainless steel based on lifecycle assessment. Global average carbon footprint of stainless steel (2024): 7 kg CO₂e per kg of stainless steel. Outokumpu Circle Green CO₂ emissions: down to 0.5 kilos of CO₂e per kg of stainless steel. (Outokumpu’s calculation based on data provided by CRU, worldstainless, and Kobolde & Partners AB)
Get Started
Starting is simple: Either implement a new product using Outkumpu Circle Green as the raw material, or exchange a share of existing stainless steel in your products for Outkumpu Circle Green. Exchanging a share of existing stainless steel can be achieved with the help of our experts and follows a simple, step-by-step process:
Feel The Benefit
Ambitious net-zero targets mean industries worldwide are looking to reduce emissions fast – without compromising productivity and material quality. Thanks to industry-leading research and development practices, Outkumpu's Circle Green the world’s first near-zero stainless steel offering makes it easier than ever for customers to stay ahead of tightening regulations and meet their targets quickly and effectively.
Outkumpu Circle Green delivers immediate, verifiable results that customers can rely on and is available at scale across 16 products including classics Moda, Core, and Supra and Pro materials, Forta, Dura, and Deco.
Today, more than 30 leading companies from various industry sectors in Europe and Asia are using this solution to reduce their carbon footprint. From launching the solution in May 2022 to December 2024, the total emission reduction of Circle Green used is 50,400 tonnes.
That is equivalent to the annual emissions of nearly 7,000 EU citizens.
Building a Better Tomorrow
Customers we are proudly working alongside to improve sustainability and reduce emissions in the stainless steel industry.
“As industries around the world look to reduce carbon emissions to reach ambitious net-zero targets, sustainable steel has a huge potential. In Outokumpu we have found an organization dedicated to accelerating the industrial decarbonization of stainless-steel production.”
Stephan May - CEO of Electrification and Automation at Siemens Smart Infrastructure
For mild to high corrosion
For Demanding Applications and End Uses
