Description

ASTM A**0 ASME SA**0 **7L /UNS S****3/ W. Nr. 1.***8 stainless steel plate

**7L (UNS S****3) is a molybdenum-bearing austenitic stainless steel with greatly increased resistance to chemical attack as compared to the conventional chromium-nickel austenitic stainless steels such as Alloy **4. In addition, Alloy **7L offers higher creep, stress-to-rupture, and tensile strength at elevated temperatures than conventional stainless steels. It is a low carbon or "L" grade which provides resistance to sensitization during welding and other thermal processes.

General Properties
**7L (UNS S****3) is a lowcarbon corrosion resistant austenitic chromium-nickel-molybdenum stainless steel. The high levels of these elements assure the alloy has superior chloride pitting and general corrosion resistance to the conventional **4/**4L and **6/**6L grades. The alloy provides improved resistance relative to **6L in strongly corrosive environments containing sulfurous media, chlorides, and other halides.

The low carbon content of **7L enables it to be welded without intergranular corrosion resulting from chromium carbide precipitation enabling it to be used in the as-welded condition. With the addition of nitrogen as a strengthening agent, the alloy can be dual certified as **7 (UNS S****0).

**7L is non-magnetic in the annealed condition. It cannot be hardened by heat treatment, however the material will harden due to cold working. **7L can be easily welded and processed by standard shop fabrication practices.

Applications

• Air Pollution Control — flue gas desulfurization systems (FGD)
• Chemical and Petrochemical Processing
• Explosives
• Food and Beverage Processing
• Petroleum Refining
• Power Generation — condensers
• Pulp and Paper