316L Stainless Steel Threaded Blind Flange, Corrosion Resistant Plug Flange for Chemical & Seawater Pipelines

316L corrosion-resistant threaded blind flange is a professional blocking fitting for chemical, seawater, salt fog and sewage corrosive conditions. Forged from molybdenum-containing ultra-low carbon 316L stainless steel, it provides far better resistance to chloride, weak acid, sewage and salt fog than 304 steel, solving long-term rusting, pitting and sealing failure problems of ordinary blind flanges. The thick solid structure ensures stable pressure resistance without bulging and deformation during high-pressure testing and long-term isolation. Welding-free bolt locking suits chemical explosion-proof and coastal fire-prohibited construction. Ultra-low carbon design resists intergranular corrosion, avoiding rust, perforation and leakage in humid corrosive environments to reduce maintenance cost. Precisely flat passivated sealing surface resists medium scouring and aging for long-term stable tightness. Standard NPT thread ensures flexible reusable installation for corrosion pipe pressure test and isolation. Manufactured per ASME B16.5 standards with accurate dimension and strong interchangeability for all 316L threaded pipes and equipment. Widely used in chemical corrosive pipelines, seawater desalination, coastal municipal pipes, sewage treatment and salt fog factory equipment blocking.

Core Selling Points

1. Molybdenum 316L resists seawater, salt fog and chemical corrosion;

2.  Ultra-low carbon anti-pitting design avoids perforation and rust in corrosive environments;

3.  Thickened solid forging ensures pressure resistance without deformation;

4.  Welding-free explosion-proof installation for corrosive fire-prohibited areas;

5.  Precise sealing surface achieves long-term isolation zero leakage;

6.  Reusable for high corrosion engineering flexibility;

7.  Enhanced passivation resists medium scouring and aging;

8.  ASME standard size for universal interchangeability.

   
   

Application Scenarios

Weak acid chemical pipeline blocking, seawater desalination equipment pipes, coastal salt fog pipe networks, industrial sewage pipe isolation, environmental corrosive equipment ports, chemical pressure test projects, seaside municipal maintenance blocking, salt medium pipe network closure.

Why Choose Us

We specialize in genuine 316L anti-corrosion blind flanges with solid forging, no stamping or fake material. PMI test, thickness verification and flatness inspection ensure long-term safety and stability in corrosive conditions, providing complete quality guarantee documents for chemical and seawater projects

Customization Ability

Custom thickened high-pressure threaded blind flanges, non-standard large-bore threaded plugs, NPT/BSP multi-thread blind flanges, high-strength pressure test blocking flanges, mirror polished sanitary blind flanges, project laser marking, export anti-rust packaging, special pressure grade customization

FAQ

1:How long is the custom lead time for stainless steel flanges in Wenzhou?

— 8 to 10 working days

2:What is the fastest delivery time?

— 3 working days

3:Do you support non-standard custom flanges?

— Yes, we do.

4:Can you process special sizes?

— Yes. Max processing size: 4000 mm, Min processing size: 30 mm.

5:Do you have stainless steel flanges of standard sizes in stock?

— Yes.

6:Can we customize flanges based on customer drawings or samples?

— Yes.

7:Will material test certificates and inspection reports be provided for the purchased flanges?

— Yes, they will.

8:Is there a quality warranty for the flange products?

— Yes.

9:How to handle quality defects if they occur?

— Product return and exchange available.