Stainless Steel 347 Plates Manufacturer and Supplier

Stainless Steel 347 is a niobium-stabilised austenitic stainless steel produced to ASTM A240 and ASME SA-240 standards. It contains 17.0-19.0% chromium and 9.0–13.0% nickel. Niobium (together with tantalum) is added to prevent intergranular corrosion when the steel is used between 800 and 1500 °F (427–816 °C). SS 347 plates have a minimum tensile strength of 75 ksi (515 MPa), a minimum yield strength of 30 ksi (205 MPa), and a minimum elongation of 35%. For aerospace applications, the material may be ordered to AMS 5512.

Sachiya Steel International is a reliable manufacturer and supplier of Stainless Steel 347 plates based in Mumbai, India. We have over 20 years of experience in stainless steel flat products. Our facility is ISO 9001, ISO 14001, and ISO 45001 certified, and every shipment comes with mill test certificates as per EN 10204 3.1/3.2. We specialise in wide-width plates. These plates are available in thicknesses from 3/16 inches (4.8 mm) to 4 inches (101.6 mm), in widths up to 120 inches and lengths up to 480 inches. Surface finishes include hot-rolled, annealed and pickled (HRAP), 2D, 2B, No.1 and No.4, and plates can be custom cut to non-standard sizes on request.

Also known as UNS S34700, this alloy is resistant to intergranular corrosion after being heated to temperatures between 800 and 1500 °F (427-816 °C). The 347 grade is particularly effective in sensitised environments. After prolonged high-temperature exposure, it retains corrosion resistance that unstabilised grades lose. 347 SS plate is readily weldable using GTAW (TIG), SMAW and GMAW methods.

This page covers the following information about TP 347 plates:

Specifications
Pricing
Chemical Composition
Mechanical Properties
Equivalent Grades
Industrial Applications
Grade Comparison
Shipping & Packaging
Frequently Asked Questions

Specifications of Stainless Steel 347 Plates

The table below shows the standard specifications of Stainless Steel 347 plates. It gives a clear overview of the available options to help you choose the right material for different industrial and high-temperature applications.

Property	Details
Standard	ASTM A240 / ASME SA-240, ASTM A480
Thickness	3 mm to 150 mm
Width	1000 mm to 2500 mm
Length	2000 mm to 6000 mm
Common Stock Sizes	4 ft × 8 ft, 5 ft × 10 ft, custom-cut to size
Finish	HRAP (No. 1), 2B, BA, #4 Polished
Form	Flat plate, chequered / safety plate
Condition	Hot rolled, annealed, and pickled
Processing	Cutting, bending, machining, and surface polishing

Available Sizes for Stainless Steel 347 Plates

SS 347 plates are available in thicknesses from 3/16 inches (4.8 mm) to 4 inches (101.6 mm). Standard widths go up to 120 inches, and lengths up to 480 inches. Custom sizes can be supplied on request.

Dimension	Range
Thickness	3/16 inches (4.8 mm) to 4 inches (101.6 mm)
Width	48, 60, 72, 96, 120 inches
Length	Up to 240 inches (standard); up to 480 inches (plate mill)

Forms

SS 347 plates are usually supplied in hot-rolled, annealed and pickled (HRAP) condition. Material thinner than 3/16 inches is called sheet, and thicker than 3/16 inches (4.8 mm) is called plate.

Surface Finishes

2B Finish
No. 1 Finish (Hot Rolled Annealed & Pickled – HRAP)
BA Finish (Bright Annealed)
No. 4 Finish
No. 8 Finish (Mirror Finish)

Stainless Steel 347 Plates Price

Stainless Steel 347 plate prices in India are typically between Rs 280 and Rs 390 per kg, depending on thickness and order quantity. In the United States, prices can range from about $4.00 to $9.50 per kg, depending on the plate dimensions and the surface finish. The final price is influenced by thickness, width, length, surface finish, order quantity, and current raw material costs. For an exact and up-to-date quotation, please contact our sales team.

Chemical Composition of Stainless Steel 347 Plates

The table below lists the chemical composition of ASTM A240 Type 347 plate per ASME SA-240. Niobium stabilisation is the defining feature of this grade.

Carbon C

Max 0.08%

Manganese Mn

Max 2.00%

Phosphorus P

Max 0.045%

Sulphur S

Max 0.030%

Silicon Si

Max 1.00%

Chromium Cr

17.0 – 19.0%

Nickel Ni

9.0 – 13.0%

Niobium + Tantalum Nb+Ta

10xC min, 1.00% max

Mechanical Properties of SS 347 Plates

ASTM A240 Type 347 plate has a minimum tensile strength of 75 ksi (515 MPa) and a yield strength of 30 ksi (205 MPa). The values below are as per ASME SA-240.

490 (71)

MPa (ksi)

Tensile Strength

515 (75)

MPa (ksi)

Yield Strength

35%

(min)

Elongation

Property	Details
Tensile Strength (min)	75 ksi (515 MPa)
Yield Strength, 0.2% Offset (min)	30 ksi (205 MPa)
Elongation in 2 inches (min)	35%

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Equivalent Grades of Stainless Steel 347 Plates

The table below shows international equivalent grades of Stainless Steel 347 plates. It helps engineers and buyers find matching standards used in different countries so they can choose the right material and meet project requirements.

Property	Details
UNS	S34700
Europe (EN)	1.4550 (X6CrNiNb18-10)
Japan (JIS)	SUS 347
China (GB/T)	0Cr18Ni11Nb
UK (BS)	347S31
South Korea (KS)	STS 347
France (AFNOR)	Z6CNNb18-10
Russia (GOST)	08Kh18N12B

Industrial Applications of Stainless Steel 347 Plates

SS 347 plates are mainly used in four major industries. Their strong resistance to corrosion at high temperatures makes them a good choice for equipment in these sectors.

Chemical and Petrochemical Processing

Alloy 347 plates are used in reactor vessels, heat exchangers and distillation columns exposed to high temperatures and corrosive media in refineries and chemical plants.

Power Generation and Waste Heat Recovery

Type 347 plate serves in superheater tubing support plates, recuperators and boiler components that operate above 800 degrees F for extended periods.

Food Processing and Pharmaceutical Equipment

The grade’s resistance to sensitisation makes it suitable for sterilisation vessels and process tanks that undergo repeated heating and cooling cycles.

Aerospace Components

SS 347 plates conforming to AMS 5512 are used in aircraft exhaust stacks, collector rings and engine components where high-temperature strength is required.

Stainless Steel 347 vs 347H Plate

This comparison explains the main differences between Stainless Steel 321 and 347 plates so you can choose the right one based on how they are stabilised, resistance to corrosion, and high temperature performance.

Parameter	Stainless Steel 347 Plate	Stainless Steel 347H Plate
Carbon Content	Max 0.08%	0.04% – 0.10%
Grade Type	Standard stabilised austenitic grade	High-carbon version of 347
High-Temperature Performance	Suitable for moderate temperatures	Improved creep resistance at high temperatures
Temperature Suitability	Below 1000°F (537°C)	Above 1000°F (537°C)
Creep Resistance	Standard	Enhanced due to higher carbon
Typical Application	General corrosion and moderate heat service	Pressure vessels and sustained high-temperature service
Dual Certification	Possible (when carbon overlaps)	Possible (0.04–0.08% carbon range)

347 vs 321 Stainless Steel Plate for High-Temperature Service

This comparison outlines the key differences between Stainless Steel 321 and 347 plates, helping in selecting the right grade based on stabilisation method, corrosion resistance, and specific high-temperature service requirements.

Parameter	Stainless Steel 347 Plate	Stainless Steel 321 Plate
Stabilising Element	Niobium (Columbium)	Titanium
Grade Type	Nb-stabilised austenitic stainless steel	Ti-stabilised austenitic stainless steel
Intergranular Corrosion Resistance	Excellent	Excellent
Performance in Oxidising Environments	Slightly better	Good
Polythionic Acid Resistance	Preferred choice	Less preferred
Typical Applications	Petroleum refining, chemical processing	Aerospace, high-temperature equipment
Selection Criteria	Used where Nb stabilisation is preferred	Used when Ti stabilisation is specified by design codes

Shipping & Packaging

Heavy-duty wooden boxes Packing

Export Packaging Standard

We strictly follow seaworthy export handling standards to protect SS 347 plate from transit damage, moisture ingress, and surface contamination during long-distance dispatch.

Heavy-duty wooden boxes with moisture barrier lining
HDPE stretch film wrapping on all bundles
Edge and corner protection with plastic padding
Silica gel desiccants to minimize moisture exposure
ISPM-15 fumigated wooden packaging for export

Plate Bundle Yard Staging

Plate Bundle Edge Protection

Wrapped Export-Ready Bundles

We Export Worldwide

Sachiya Steel International supplies stainless steel products to major industrial markets across North America, Europe, the Middle East, Asia and Africa with export-ready documentation and logistics support.

USA
Canada

Frequently Asked Questions:

What thicknesses are available for Stainless Steel 347 Plates? +

SS 347 plates are available in thicknesses from 3/16 inches (4.8 mm) to 4 inches (101.6 mm). Custom thicknesses may be available on request, depending on mill schedules.

What is the difference between 347 and 347H Stainless Steel Plate? +

347H has higher carbon content (0.04–0.10% vs 0.08% max) for improved creep resistance above 1000 °F. Most plates can be dual-certified to both grades when carbon falls within the overlap range.

Can SS 347 Plates be welded without post-weld heat treatment? +

Yes. Niobium stabilisation in 347 prevents sensitisation, so post-weld heat treatment isn’t required for most service conditions. Use ER347 or E347 filler metals.

What is the maximum service temperature for 347 Stainless Steel Plates? +

347 stainless steel plates can handle continuous service up to approximately 1500 degrees F (816 degrees C). Intermittent service at higher temperatures is possible depending on the specific environment.

What is the current price of Stainless Steel 347 Plates? +

Prices range from approximately Rs 280–390/Kg in India, depending on thickness and quantity. US market pricing varies widely by cut dimensions. Contact us for a current quote.