Stainless Steel 304 and 304L - Custom Fabrication in Laval
304 stainless steel is the most widely used grade in global industry. Its chemical composition, primarily iron, chromium (18%) and nickel (8%), provides exceptional corrosion resistance in a wide variety of environments. Whether for food processing, pharmaceutical manufacturing, water treatment or industrial construction, 304 is often the first choice for engineers and industrial purchasers.
What distinguishes 304 from 304L?
Grade 304L is a low-carbon variant of standard 304. This seemingly minor difference has significant implications for industrial applications. The reduced carbon content of 304L (0.03% maximum versus 0.08% for 304) significantly improves the material’s weldability and reduces the risk of intergranular corrosion in thermally affected zones during welding operations.
In practice, 304L is preferred for structures requiring intensive welding, including tanks, field-assembled piping and complex multi-weld equipment. The cost difference between the two grades is generally minimal, leading many buyers to opt for 304L as a precaution, even in applications where standard 304 would have been sufficient.
It is important to note that 304L has slightly lower mechanical properties at elevated temperatures. In applications where hot mechanical strength is critical, standard 304 or a more suitable grade such as 309 should be considered. ADI Laval’s technical team can advise you on the optimal choice for your specific application.
Industrial applications of 304 stainless steel
304 and 304L steel is used in an extremely wide range of industrial and commercial applications. In the food sector, it is the reference material for mixing tanks, conveyors, work tables, cooking and cooling equipment, silos and storage tanks. Its ease of cleaning and resistance to sanitary products make it the logical choice for any equipment in contact with food products.
In the pharmaceutical industry, 304L is widely used in reactors, distillation columns, sanitary piping systems and purified water treatment equipment. Surface finish requirements in this sector are particularly high, and ADI Laval has the polishing equipment needed to meet the strictest specifications, up to mirror finishes.
Wastewater treatment and water management are among ADI Laval’s historical business sectors. 304 stainless steel is used for screens, weirs, scraper bridges, filtration systems and many other treatment plant components. Its resistance to corrosion in chlorine-treated water makes it a well-suited material for these environments.
In pulp and paper, another key sector for ADI, 304 is used to manufacture tanks, agitators, press and washer components, as well as various wear parts. This alloy’s resistance to alkaline solutions used in the pulping process makes it a reliable and cost-effective long-term choice.
Fabrication processes available at ADI Laval
Our Laval workshop is entirely dedicated to custom fabrication in stainless steel and specialty metals. For processing 304 and 304L, we have a complete set of fabrication processes, from cutting to delivery of the finished part.
Laser cutting is one of our key strengths. Our 4,000 W laser, manufactured by Amada with Fanuc technology, is equipped with an interchangeable table measuring 60 inches by 120 inches. The table edges are exclusively stainless steel, ensuring no contamination of finished parts. We can cut stainless steel from 30 ga (0.020 inch) up to 1 inch thick, with delivery possible in under 24 hours for urgent orders.
Bending, rolling, certified TIG and MIG welding, polishing and complete assembly are also performed in-house, allowing us to control every step of the process and guarantee part conformity to your specifications. For more complex projects, our drafting team produces 3D drawings via SolidWorks, enabling feasibility validation before production begins.
ISO 9001 certification and quality commitment
ADI Laval has held ISO 9001 certification since 1999. This quality management system structures our entire approach to fabrication: from material reception to finished part delivery, every step is documented, controlled and traceable. For our clients in the food, pharmaceutical and medical sectors, this certification is often a non-negotiable requirement, and we are proud to have met it for over 25 years.
Our certification requires us to maintain rigorous procedures for non-conformity management, raw material supplier qualification, measurement equipment calibration and operator competency. By choosing ADI Laval, you choose a partner whose quality is verifiable and auditable.
Why choose ADI Laval for your 304 and 304L projects?
With over 40 years of combined experience in stainless steel processing, ADI Laval is recognized as the manufacturing arm of numerous engineering firms and industrial companies in Quebec and beyond. We have completed major projects in South America and Europe, and we are the proud partner of the first building constructed in stainless steel in North America.
Our approach is firmly solution-oriented. As we often say: there are no bad projects, you just need to find how to produce them efficiently. Whether you have complete engineering drawings or a simple idea on paper, our team is here to turn your vision into reality, on time and on budget.
Variant Comparison
| Grade | Characteristic |
|---|---|
| 304 | Most common, general purpose, excellent formability |
| 304L | Low carbon - better weldability, intergranular corrosion resistance |
Technical Specifications
Industries & Typical Uses
- Food processing equipment
- Tanks and vessels
- Industrial piping
- Architecture and structures
- Hospital equipment
Frequently Asked Questions - SS 304
What is the difference between 304 and 316 for my food equipment?
Both grades are accepted for food equipment, but 316 is preferred in environments containing chlorides or more aggressive acids, such as certain clean-in-place (CIP) products. For most standard food applications, 304 is perfectly adequate and more economical. If in doubt, our team can help determine the optimal grade based on the products you process and the cleaning products you use.
Can ADI Laval handle the design of my 304 part if I don’t have drawings?
Absolutely. Our drafting team produces 3D drawings using SolidWorks from your ideas, sketches or functional specifications. We are accustomed to working with clients who have a clear idea of the desired result but not necessarily the internal resources to produce technical drawings. We also integrate our material knowledge to optimize the design for efficient and durable fabrication.