What is 304L steel ? It is a specialised low carbon version of 304 stainless steel with enhanced weldability. Stainless steel projects must prioritise reliable fabrication, which often involves a lot of welding, whereas standard stainless steel can be subject to post-weld corrosion. That’s why it is so important.
What is 304L Steel? The Weld-Optimized 304!
304L is an austenitic stainless steel, very similar to 304 steel, the main difference being its carbon content. It has a low maximum carbon content (0.03% vs. 0.08%). This low carbon minimises the precipitation of chromium carbide. This occurs during the welding process and greatly improves post-weld corrosion resistance.
Core Advantages of 304L Steel
Low carbon prevents sensitisation, meaning that the weld is resistant to intergranular corrosion. This is critical in corrosive environments and ensures integrity after fabrication.
The steel is particularly easy to weld, reducing the risk of welding defects. Ensures strong and reliable stainless steel pipe joints.
Like 304 steel, 304L steel is resistant to common corrosive agents. Resistance to atmospheric corrosion makes it ideal for general industrial applications.
It has excellent ductility and is easily formed and deep-drawn. It is favourable for the production of complex shapes.
304L steel is slightly more expensive than 304, but avoids costly failures. Post-weld tratamento térmico is avoided, saving fabrication time and cost.
Chemical Composition of 304L Steel
| Elemento | Cr | Ni | C | Mn | Si | P | S |
|---|---|---|---|---|---|---|---|
| Content (%) | 18.0 – 20.0 | 8.0 – 12.0 | ≤0.03 | ≤2.00 | ≤0.75 | ≤0.045 | ≤0.030 |
O que fazemos
Typical Mechanical Properties of 304L Steel
| Resistência à tracção | Yield Strength (0.2% Offset) | Alongamento | Hardness (HRB) | Densidade | Melting Range |
|---|---|---|---|---|---|
| ≥485MPa(70ksi) | ≥170MPa(25ksi) | ≥40 | ≤92 | 8.0g/cm³ | 1400−1450°C |
304L Steel in Stainless Steel Pipe and Fittings
- WELDED PIPING SYSTEMS: For all welded piping, including general chemical process piping.
- Building structures: Welded railings, brackets and decorative elements are made of 304L.
- Food Processing Equipment: Welded tanks, vessels and pipework. It meets hygiene standards and withstands cleaning agents after welding.
- Brewery and Dairy Equipment: Complex welded components in these industries rely on 304L steel to ensure product purity and system longevity.
- Pharmaceutical industry: Clean-in-place systems often use 304L welded components to minimise the risk of contamination.
Sourcing 304L Steel Pipes and Fittings
Check for compliance with ASTM standards. ASTM A312 covers seamless e tubo de aço inoxidável soldado. ASTM A403 covers wrought austenitic stainless steel fittings.
Ensure that pipes and acessórios meet the required dimensions. This includes specifications (e.g., Sch 10S, Sch 40S). Proper fit is critical.
View Stainless Steel Tube Specification Document
Work with reputable manufacturers who offer reliable 304L steel products and have certifications(e.g. ISO 9001 and CE-PED).
Always ask for Material Test Reports, which confirm chemical composition and verify mechanical properties.
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