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SS 321 / 321H Sheets and Plates Dealers and Importers

SS 321 / 321H Stainless Steel Sheets and Plates Supplier

SS 321/321H Stainless Steel Sheets and Plates

Petrofit Alloys And Engineering LLP is a trusted supplier, dealer and importer of SS 321 and SS 321H sheets and plates used in high-temperature industrial environments. Stainless Steel 321 is a titanium-stabilized austenitic stainless steel grade designed to provide improved resistance to intergranular corrosion after welding.

SS 321 and SS 321H sheets and plates are commonly used in aerospace components, heat exchangers, refinery equipment and high-temperature processing systems. The addition of titanium stabilizes the material and prevents chromium carbide precipitation during welding, making it suitable for applications exposed to elevated temperatures.

For applications primarily requiring corrosion resistance rather than high-temperature stability, industries often use SS 316 / 316L sheets and plates. However, SS 321 and SS 321H are preferred where materials are exposed to prolonged heating and welding conditions.

As part of our broader stainless steel sheets and plates supply, Petrofit maintains ready inventory of SS 321 and SS 321H materials in various thicknesses, finishes and plate dimensions to support fabrication companies, EPC contractors and industrial distributors worldwide.

SS 321 / 321H Sheet and Plate Specifications

Specification Details
Material Grade Stainless Steel 321 / 321H
UNS Number S32100 / S32109
Standard ASTM A240 / ASME SA240
Type Sheet, Plate, Coil
Thickness 0.3 mm – 120 mm
Width 1000 mm, 1250 mm, 1500 mm, 2000 mm
Surface Finish 2B, No.4, Hairline, Polished
Production Process Hot Rolled / Cold Rolled

Chemical Composition

SS 321

Element Percentage
Carbon 0.08% max
Chromium 17.00 – 19.00%
Nickel 9.00 – 12.00%
Titanium 5x (C + N) min
Manganese 2.00% max
Silicon 0.75% max

SS 321H

Element Percentage
Carbon 0.04 – 0.10%
Chromium 17.00 – 19.00%
Nickel 9.00 – 12.00%
Titanium Stabilized
Manganese 2.00% max
Silicon 0.75% max

The titanium stabilization in SS 321 helps prevent intergranular corrosion and improves performance during welding and high-temperature exposure.

Mechanical Properties

Property SS 321 SS 321H
Tensile Strength 515 MPa min 515 MPa min
Yield Strength 205 MPa min 205 MPa min
Elongation 40% min 40% min
Hardness 217 HB max 217 HB max

These properties allow SS 321 and SS 321H sheets and plates to maintain mechanical integrity in elevated temperature environments.

Key Features of SS 321 / 321H Sheets and Plates

SS 321 and SS 321H stainless steel grades are widely used in industries where resistance to high temperatures and welding stability are important.

Important features include:

  • Titanium stabilization for improved resistance to intergranular corrosion
  • Good oxidation resistance at elevated temperatures
  • Excellent performance in welded structures
  • Strong mechanical strength and durability
  • Suitable for high-temperature industrial applications

Applications of SS 321 / 321H Sheets and Plates

SS 321 and SS 321H sheets and plates are used in industries where materials must perform reliably under high-temperature conditions and welding environments.

  • Heat exchangers and furnace components
  • Aerospace equipment and exhaust systems
  • Oil and gas refinery equipment
  • Chemical processing systems
  • Expansion joints and high-temperature piping
  • Industrial boilers and pressure vessels

Equivalent Grades

Standard SS 321 SS 321H
ASTM / ASME 321 321H
UNS S32100 S32109
EN 1.4541 1.4878
JIS SUS321 SUS321H
DIN X6CrNiTi18-10 X8CrNiTi18-10

Export Supply

From India, Petrofit exports SS 321 and SS 321H sheets and plates to industrial distributors, engineering companies and project contractors across international markets.

Our export markets include:

  • Middle East – Saudi Arabia, Qatar, Oman, Kuwait, Bahrain
  • Asia Pacific – Malaysia, Singapore, Australia
  • Europe – Germany, Italy, Netherlands, Spain, UK
  • North America – United States and Canada

Why Choose Petrofit for SS 321 / 321H Sheets and Plates

Industrial buyers require dependable suppliers capable of delivering high-quality materials along with reliable logistics and documentation.

Petrofit offers:

  • Extensive inventory of stainless steel sheets and plates
  • Competitive pricing for fabrication and EPC projects
  • Global export experience across industrial markets
  • Compliance with international material standards
  • Material traceability and inspection certification
  • Efficient shipment coordination for international delivery

Frequently Asked Questions

Q: What are SS 321 sheets and plates used for?

A: SS 321 sheets and plates are commonly used in aerospace components, refinery equipment, heat exchangers and high-temperature industrial systems.

Q: What is the difference between SS 321 and SS 321H?

A: SS 321H contains a higher carbon content, which improves creep resistance and high-temperature strength compared to SS 321.

Q: Why is SS 321 used in high-temperature applications?

A: SS 321 contains titanium stabilization, which prevents carbide precipitation during welding and improves resistance to intergranular corrosion at elevated temperatures.

Q: Do you supply SS 321 sheets and plates with certification?

A: Yes. Petrofit supplies SS 321 and SS 321H materials with EN 10204 3.1 material test certificates along with inspection documentation if required.

Request a Quote

If you are searching for reliable SS 321 / 321H sheet and plate dealers and importers, Petrofit Alloys And Engineering LLP can assist with product specifications, stock availability and delivery schedules.

Contact our team to request technical information, pricing or quotations for your industrial project requirements.

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