SS 347 Clad PlateASTM A240 · ASTM A264 / A265 · Manufacturer, stockist & exporter, India
AISI 347 · UNS S34700
An SS 347 clad plate is carbon-steel plate bonded to a corrosion-resistant alloy layer, made from SS 347 to ASTM A240. Clad plate puts a thin alloy layer where the fluid is, on a cheaper carbon-steel base that carries the pressure — often far cheaper than solid alloy for thick vessels.
- ASTM A240
- ASTM A264 / A265
- EN 10204 3.1 / 3.2
- Export packing
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is an SS 347 Clad Plate?
- What it is
- Carbon-steel plate bonded to a corrosion-resistant alloy layer
- Material
- ASTM A240
- Dimensions
- ASTM A264 / A265 · ASME SA-264 / SA-265
- Grade
- SS 347 · UNS S34700
- Best at
- Welded high-temperature piping in refineries and power plants
SS 347 Clad Plate Specification
| Product | SS 347 Clad Plate |
|---|---|
| Material standard | ASTM A240 |
| Dimensional standard | ASTM A264 / A265 · ASME SA-264 / SA-265 |
| Thickness | 4.76 mm (3/16") and up |
| Size | Mill plates or cut to drawing |
| Testing | PMI · dimensional · NDT and IGC on request |
| Documents | EN 10204 3.1 · 3.2 with third-party inspection |
When to Choose a Clad Plate
Clad plate puts a thin alloy layer where the fluid is, on a cheaper carbon-steel base that carries the pressure — often far cheaper than solid alloy for thick vessels.
- Explosion-bonded or roll-bonded
- Alloy layer 2–6 mm typical
- Base: SA-516 or SA-387
More on choosing: Clad plate guide.
SS 347 Clad Plate: Why 347 for clad plates
Clad plate puts a thin alloy layer where the fluid is, on a cheaper carbon-steel base that carries the pressure — often far cheaper than solid alloy for thick vessels. In SS 347, the choice usually comes down to the medium and temperature — the rows here are the points buyers check for this exact combination.
| Why this grade | Stainless plate goes into vessels and heavy sections. SS 347 is picked for welded high-temperature piping in refineries and power plants. |
|---|---|
| Typical service | Refinery hydroprocessing — Reactor effluent piping and exchangers. |
| Matching filler | ER347 (AWS A5.9) |
SS 347 Clad Plate Chemical Composition
| Element | Weight % |
|---|---|
| Chromium | 17.0 – 19.0 |
| Nickel | 9.0 – 13.0 |
| Niobium | 10 × C min, 1.00 max |
| Carbon | 0.08 max |
| Manganese | 2.00 max |
| Silicon | 0.75 max |
| Phosphorus | 0.045 max |
| Sulphur | 0.030 max |
SS 347 Clad Plate Mechanical Properties
| Annealed plate & sheet | Value |
|---|---|
| Tensile strength | 515 MPa · 75 ksi |
| Yield strength 0.2% | 205 MPa · 30 ksi |
| Elongation | 40% |
| Hardness | 201 HB max |
Full chemistry, properties and equivalents are on the SS 347 grade page.
SS 347 Clad Plates for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiSS 347 Clad Plate — questions buyers ask
When is clad plate cheaper than solid alloy?
Usually when the total thickness is well above the corrosion allowance — the thicker the vessel, the bigger the saving.
Which standard covers SS 347 clad plates?
The material is ASTM A240; dimensions follow ASTM A264 / A265 · ASME SA-264 / SA-265. Always state both on your purchase order, with the edition if your project specifies one.
What decides the price of a SS 347 clad plate?
The alloy price, the size and dimensions, quantity, and the testing and documents required. Send your list and we quote the same working day.
What documents do you supply?
EN 10204 3.1 mill certificates as standard, 3.2 with third-party inspection on request, plus dimensional and PMI reports.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026