Duplex stainless steel S31803/S32205: Balance of high strength and corrosion resistance

In chloride corrosion environments where 316L cannot cope, or in projects where nickel-based alloys are excessively costly, duplex stainless steel (Duplex Stainless Steel) S31803/S32205 is the optimal balanced choice.

With its unique structure of 50% ferrite and 50% austenite, it addresses the two major concerns of stockists and end users.

1. Commercial value of strength: substituting thin for thick

The yield strength of S32205 is more than twice that of ordinary 316L. This means that under the same pressure, engineering design can significantly reduce the wall thickness of pipelines (for example, from Sch40 to Sch10s).

Benefits: Although the price per ton is higher than that of 316L, the total tonnage purchased decreases, coupled with reduced transportation and welding costs, often resulting in a lower total project cost.

2. Addressing pain points: Stress Corrosion Cracking (SCC)

In chloride-rich environments (such as seawater desalination and chemical fluids) at temperatures above 60°C, austenitic stainless steel is highly prone to brittle fracture. Dual-phase steel, with its high chromium, molybdenum, and nitrogen content, exhibits excellent resistance to stress corrosion cracking (SCC), making it the preferred choice for chemical containers and marine pipelines.

SMLSCO inventory advantage: addressing the "difficulty in matching"

Inventory providers often face the problem of delivery delays due to the issue of "being able to purchase but unable to obtain all the necessary components". SMLSCO provides a one-stop solution for dual-phase steel inventory:

Full range of products in stock: Regularly stocked S31803/S32205 seamless tubes, flanges, and pipe fittings.

Dual certification: Most of the inventory materials are dual certified (compliant with both S31803/S32205) and hold PED/ISO certificates.

Fully equipped: We synchronously supply butt-welding fittings (ASTM A815) and forged flanges (ASTM A182), ensuring shipment from the same batch and shortening your inventory turnover cycle.

FAQ:

Q: Is there a temperature limit for the use of dual-phase steel? A: Yes, there is. Prolonged exposure to temperatures above 300°C can lead to embrittlement, so it is strictly prohibited for use in ultra-high temperature conditions.

Q: Can S31803 and S32205 be used interchangeably? A: S32205 is a high-end upgraded version of S31803 (with better corrosion resistance). SMLSCO's inventory typically consists of dual-certified materials, which can meet the standards of both. You can purchase with confidence.

SMLSCO, Steel in Stock. Delivered on the Dot.

To obtain a quotation for S32205: info@smlspipestock.com