Stainless Steel 321 Flanges

Large Selection of ASTM A182 F321 Blind Flange Manufacturer in India As Per ASME B16.5 Standards

Mortec Manufacturing Co works as a Stainless Steel 321 Flanges Manufacturer in India. Every flange receives individual stamping for complete material traceability. Each flange carries our heat number for complete identification. Blanks are upset and die-forged at our Mumbai manufacturing works. Flanges undergo solution annealing above 1040 °C before rapid quenching. This process keeps titanium bonded with carbon as fine titanium carbide. Chromium therefore remains free in solution throughout the finished flange. This prevents grain-boundary attack after welding or prolonged soaking. It also protects against carbide precipitation between 425-815 °C during service.

Machining, facing and drilling are completed fully in-house to required standards. Manufacturing follows ASME B16.5, ASME B16.47, MSS SP-44, EN 1092-1 and JIS B2220. Sizes range from ½" NB upto 48" NB across Class 150-2500. We supply WNRF, SORF, BLRF, SWRF and lap joint patterns. Spectacle blind and orifice flanges are also available for dispatch. Standard dispatch takes three to five working days. PMI, hydrostatic testing and ASTM A262 Practice E reports are provided. Certification includes EN 10204 3.1 or 3.2 documentation for compliance.

Detailed specifications cover heat treatment, testing, approvals, and packing requirements.

We are a reliable Stainless Steel 321 Flanges Supplier in India, with standard sizes and thread types ready in stock.

321 Stainless Steel Weld Neck Flange

ASME B16.5 • ½″–24″

• Long tapered hub, butt-welded to pipe bore
• Preferred for thermal cycling and creep service

INOX 321 Slip On Flanges

ANSI B16.5 • Class 150–600

• Slides over pipe, filleted inside and out
• Lower cost fit-up for low-pressure headers

AISI 321 Blind Flange

ASME B16.5 • Class 150–2500

• Solid disc closing vessel nozzles and line ends
• Drilled and tapped for instrument tappings

DIN 1.4541 Spectacle Blind Flanges

ASME B16.48 • Positive Isolation

• Figure-of-eight plate swung open or closed
• Visible proof of isolation during shutdowns

UNS S32100 Threaded Flange

NPT / BSPT • Class 150–600

• Screwed connection with no site welding
• Chosen where hot work permits are restricted

321 SS Orifice Flange

ASME B16.36 • Class 300–2500

• Jack screws and radius pressure tappings
• Paired with meter runs for flow measurement

Class 150 flange dimensions follow ASME B16.5, in millimetres. Higher-class and EN 1092-1 charts are available with quotations.

Sectors that put Grade 321 on the line list, almost always because of heat.

Ex-stock inventory and mill-order dispatch to buyers across the Gulf region.

Middle East & GCC

Dubai, UAE

Sharjah, UAE

Dammam, Saudi Arabia

Muscat, Oman

All three share the 18-10 base and the same minimum room-temperature strength - the difference is what happens after heat.

Published service boundaries for Grade 321 in oxidising air, plus the heat-treatment window we hold in the plant.

Face selection follows the gasket and the mating equipment — tell us both and we machine to suit.

Why project engineers keep this grade on the line list once heat enters the equation.

Eight controlled stages from heat-numbered billet to sealed export case, all under Mortec supervision.

Carton and drum-packed shipments moving to buyers across Southern and East Africa.

Africa

Durban, South Africa

Johannesburg, South Africa

Mombasa, Kenya

Nairobi, Kenya

Kampala, Uganda

Choose your preferred shipping route, with lead times confirmed after size, class and finish are finalized.

The questions that come up most often before a purchase order is released.