Typical applications
- Automotive applications
- Industrial exhaust systems
The stainless steel of tomorrow
Stainless steel grades available in Circle Green
Circle Green Moda 409/4512
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.
- EN: 1.4512
- ASTM type: 409 / S40910
- Microstructure: Ferritic
Product forms
Chemical composition
- C: 0.02
- Cr: 11.5
- Ni: 0.2
- Mo:
- N:
- Other: Ti:0.30
Circle Green Moda 430/4016
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.
- EN: 1.4016
- ASTM type: 430 / S43000
- Microstructure: Ferritic
Typical applications
- Kitchen equipment
- Household appliances
- Sinks
- Flanges and valves
Product forms
Chemical composition
- C: 0.05
- Cr: 16.2
- Ni:
- Mo:
- N:
- Other:
Circle Green Moda 410L/4003
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.
- EN: 1.4003
- ASTM type: - / S40977, S41003
- Microstructure: Ferritic
Typical applications
- Railroad and road vehicles
- Shipping containers
- Industrial applications
- Mining conveyors
Product forms
Chemical composition
- C: 0.02
- Cr: 11.5
- Ni: 0.5
- Mo:
- N:
- Other:
Circle Green Core 304/4301
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.
- EN: 1.4301
- ASTM type: 304 / S30400
- Microstructure: Austenitic
Typical applications
- Household appliances and consumer goods
- Kitchen equipment
- Indoor and outdoor cladding, handrails, and window frames
- Food and beverage industry equipment
- Storage tanks
- Flanges and valves
Product forms
Chemical composition
- C: 0.04
- Cr: 18.1
- Ni: 8.1
- Mo:
- N:
- Other:
Circle Green Core 304L/4307
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.
- EN: 1.4307
- ASTM type: 304L / S30403
- Microstructure: Austenitic
Typical applications
- Food and beverage industry equipment
- Chemical and pharmaceutical industry equipment
- Heat exchangers
- Storage tanks and containers
- Pipes
- Flanges and valves
Product forms
Chemical composition
- C: 0.02
- Cr: 18.1
- Ni: 8.1
- Mo:
- N:
- Other:
Circle Green Core 441/4509
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.
- EN: 1.4509
- ASTM type: - / S43940
- Microstructure: Ferritic
Typical applications
- Indoor cladding
- Restaurant equipment and appliances
- Tubes
- Heat exchangers
Product forms
Chemical composition
- C: 0.02
- Cr: 17.6
- Ni:
- Mo:
- N:
- Other:
Circle Green Supra 316/4401
Circle Green® is the world’s first towards zero carbon stainless steel. It has the lowest carbon footprint in the industry.
- EN: 1.4401
- ASTM type: 316 / S31600
- Microstructure: Austenitic
Typical applications
Product forms
Chemical composition
- C: 0.04
- Cr: 17.2
- Ni: 10.1
- Mo: 2.1
- N: 0.04
- Other:
Circle Green Supra 316L/4404
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.
- EN: 1.4404
- ASTM type: 316L / S31603
- Microstructure: Austenitic
Typical applications
- Equipment in the chemical and petrochemical industry
- Pulp and paper industry equipment
- Textile industry equipment
- Food and beverage industry equipment
- Pharmaceutical industry equipment
- Medical applications
- Flanges and valves
Product forms
Chemical composition
- C: 0.02
- Cr: 17.2
- Ni: 10.1
- Mo: 2.1
- N:
- Other:
Circle Green Dura 4116
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.
- EN: 1.4116
- ASTM type: - / -
- Microstructure: Martensitic
Typical applications
- Cutting instruments
Product forms
Chemical composition
- C: 0.5
- Cr: 14.4
- Ni:
- Mo: 0.6
- N:
- Other: V:0.11
Tomorrows Standards Today
A breakthrough in sustainable stainless steel
Renewable
Renewable and low-carbon energy
By using only renewable sources and low-carbon electricity in our production we have eliminated 95% of all scope 1 and 2 CO2 emissions
Recycled
100% recycled content
We replaced primary raw materials with recirculated raw materials, and as a result, our Circle Green is made of up to 100% recycled material.
Optimized
Optimized production processes
Achieved by looking into the entire value chain and then acting on it, such as used biogas instead of natural gas in the production process.
How is Circle Green’s carbon footprint calculated?
We use our TÜV SÜD-verified and award-winning Product Carbon Footprint to calculate environmental 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 in the world to provide a Product Carbon Footprint (PCF) certificate using third party-verified methodology. The data distinguishes Outukumpu Circle Green® from other, conventional stainless steel offerings.
We even provide batch-specific CO2 figures for Outokumpu Circle Green®. Green energy plays a significant role in the production of the low carbon 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 towards zero carbon 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.
The Smart Choice for Sustainable Stainless Steel
Why choose Outkumpu Circle Green?
Be more attractive
Meet the growing demand for sustainable solutions.
Be faster
Accelerate your journey to sustainability leadership and achieve CO2 reduction targets.
Be better prepared
Stay ahead of tightening regulations and sustainability compliance.
Be smarter
The same high-performance material with low-CO2 footprint delivered.
Feel The Benefit
Helping our customers reduce scope 3 emissions
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® low-carbon 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.
Towards industry-wide adoption
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
Our customers
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
Resources
Learn more about Outkumpu Circle Green
FAQ
What are some common questions about Circle Green?
Answering the most important questions about Circle Green.
Read the FAQ articleWebinar
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Join us on October 14th at 4:00 pm CEST to discover how Outokumpu Circle Green® is redefining stainless steel across industries, and what it means for your business.