SS 321 Pipe Supplier in India — Titanium Stabilized Stainless Steel

SS 321 contains titanium (Ti ≥ 5×C%) which stabilizes the grain boundary carbides, preventing sensitization in the 425-870°C range. Standard SS 304 is susceptible to intergranular corrosion after exposure to this temperature range due to chromium carbide precipitation at grain boundaries. If your application involves welding or service between 425-870°C, SS 321 eliminates the risk of weld decay and intergranular attack that would affect unstabilized 304. Creative Metal Industries recommends SS 321 for any piping operating above 400°C where welded joints are present.

SS 321 pipe can operate continuously up to 870°C in oxidizing environments. The titanium stabilization specifically prevents sensitization in the 425-870°C range where unstabilized grades like 304 suffer intergranular corrosion. For intermittent service, SS 321 can handle brief excursions to 900°C. Above 870°C, consider SS 310/310S which offers superior oxidation resistance due to higher chromium and nickel content. CMI stocks SS 321 pipes for refinery, petrochemical, and power plant applications across India.

We maintain ready stock of SS 321/321H seamless pipes from 1/2 inch (15NB) to 16 inches (400NB) in schedules SCH 10S, 20S, 40S, 80S, 120, and 160 as per ASTM A312 TP321. Standard lengths are 5-7 metres (random length). Fixed-length and cut-to-length services are available on request. For tube requirements per ASTM A213 TP321/321H, we stock OD 12.7mm to 114.3mm. All material comes with complete MTC documentation.

SS 321 seamless pipe prices in India typically range from Rs 350-800 per kg depending on size, wall thickness, schedule, and order quantity. SS 321 carries a modest premium over SS 304 (approximately 10-15%) due to the titanium addition. Welded SS 321 pipes are approximately 20-30% cheaper than seamless equivalents. For exact pricing, contact Creative Metal Industries at +91 99982 80619. We offer competitive rates through direct mill procurement from Sandvik, Ratnamani, and imported sources.

SS 321 offers excellent weldability — in fact, weldability is one of the primary reasons for choosing this grade. The titanium stabilization prevents sensitization in the heat-affected zone (HAZ), eliminating the need for post-weld solution annealing in most applications. Use ER347 filler wire (niobium-stabilized) rather than ER321, as titanium does not transfer well across the welding arc. For SMAW, use E347-16 electrodes. Pre-heat is not required, and interpass temperature should be maintained below 175°C.

SS 321H is the high-carbon variant of SS 321 with controlled carbon content of 0.04-0.10% (vs ≤0.08% for standard 321). The higher carbon provides significantly better creep rupture strength at temperatures above 525°C, making 321H the preferred choice for boiler tubes, superheaters, and pressure vessels in high-temperature service. Standard SS 321 is specified where corrosion resistance and weldability are primary concerns, while 321H is specified where long-term elevated temperature strength (creep) is the design criterion.