321 Stainless Steel Coil: Titanium-Stabilized Grade, Price & Where to Buy

321 stainless steel coil: A Practical Buying Guide

Looking for a reliable 321 stainless steel coil supplier? Huaxiao Stainless keeps 100,000 tons of inventory, ships in 15 days, and is certified to ISO/TS16949. Before you request a quote, here is what actually matters when specifying and sourcing 321 stainless steel coil.

Why Choose 321 Stainless Steel Coil

321 stainless steel coil is a titanium-stabilized 18-8 austenitic grade (Ti added at roughly five times the carbon content). That titanium ties up carbon during welding and service in the 425-815 degC sensitization range, so 321 resists intergranular corrosion after welding without needing a low-carbon variant. It keeps its strength and oxidation resistance at elevated temperatures better than 304, which is why it is the go-to coil for welded structures that operate hot – exhaust, heat exchangers and furnace parts. The high-carbon 321H variant extends the service temperature even further.

If your part is welded and will see 400-800 degC, 321 is the grade that saves you from post-weld sensitization headaches.

Specifications, Sizes & Surface Finish

We stock 321 (UNS S32100) coil to ASTM A240 / A480 and JIS G4305. Thickness ranges from 0.3 mm to 3.0 mm, width from 500 mm to 1500 mm, in coil weights of 3-8 tons.

• Finish: 2B (most common), BA bright annealed, No.4 brushed, 8K mirror
• Temper: annealed / soft for forming, or 1/2 hard and full hard for springy panels
• Stabilizer: titanium present (Ti >= 5xC) – confirmed on every mill certificate
• Coating: PVC film (single or double side) to protect the surface in transit and forming

Typical mechanical properties: tensile 515 MPa minimum, yield 205 MPa minimum, elongation 40% minimum.

321 Stainless Steel Coil Price Factors

The 321 stainless steel coil price per kg carries a premium over 304 because of the titanium addition on top of the usual nickel and chromium. LME nickel movement passes straight through to the base price, so quotes are usually valid for a short window. Beyond raw material, expect these adjustments:

• Thin gauge below 0.5 mm adds rolling passes and cost
• BA and 8K mirror finishes add polishing cost over standard 2B
• Narrow slit widths add a slitting charge
• Full-coil orders price better than cut-to-length sheets

If your application never sees the sensitization temperature range, 304 may be sufficient and cheaper – ask us to compare the two grades for your actual service condition.

Common Applications

321 coil is drawn into automotive and truck exhaust systems, aircraft exhaust manifolds, heat-exchanger shells and tubes, welded tanks and ducting that operate in the 400-800 degC band, furnace and thermal-oxidizer components, and any welded part that must resist intergranular attack after fabrication. It is the stabilized alternative to 304 where welding meets heat.

How to Choose a Reliable Supplier

The single most important check for 321 is titanium content on the mill certificate – titanium is what separates 321 from 304/304L, and graders that skip it cannot prove the grade. Confirm Ti is present at the specified minimum, verify chromium and nickel ranges, and for elevated-temperature service confirm the design allowables match your code. Ask for a sample from the same coil lot for visible parts.

A credible 321 stainless steel coil supplier welcomes all of these checks. Huaxiao Stainless carries 100,000 tons in stock, ships in 15 days, and works to ISO/TS16949, which matters if your coil feeds an automotive or thermal-processing line.

Frequently Asked Questions About 321 stainless steel coil

Get a Quote for 321 stainless steel coil

321 stainless steel coil in stock: 100,000 tons available, 15-day delivery, certified to ISO/TS16949. Browse our 321 stainless steel coil product page or contact us for a quote to get a competitive price today.