SS 347 Mirror No.8 Finish SheetASTM A240 · ASTM A480 (No.8) · Manufacturer, stockist & exporter, India
AISI 347 · UNS S34700
An SS 347 mirror no.8 finish sheet is sheet polished to a mirror surface, made from SS 347 to ASTM A240. No.8 mirror is polished and buffed for signage, décor and cleanroom surfaces.
- ASTM A240
- ASTM A480 (No.8)
- 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 Mirror No.8 Finish Sheet?
- What it is
- Sheet polished to a mirror surface
- Material
- ASTM A240
- Dimensions
- ASTM A480 (No.8)
- Grade
- SS 347 · UNS S34700
- Best at
- Welded high-temperature piping in refineries and power plants
SS 347 Mirror No.8 Finish Sheet Specification
| Product | SS 347 Mirror No.8 Finish Sheet |
|---|---|
| Material standard | ASTM A240 |
| Dimensional standard | ASTM A480 (No.8) |
| Thickness | Below 4.76 mm (3/16") |
| Size | 1000 / 1219 / 1250 / 1500 × 2000 / 2438 / 2500 / 3000 mm or cut |
| Testing | PMI · dimensional · NDT and IGC on request |
| Documents | EN 10204 3.1 · 3.2 with third-party inspection |
When to Choose a Mirror No.8 Finish Sheet
No.8 mirror is polished and buffed for signage, décor and cleanroom surfaces.
- True mirror
- Polished and buffed
- Laser-film protected
More on choosing: Mirror No.8 finish sheet guide.
SS 347 Mirror No.8 Finish Sheet: Why 347 for mirror no.8 finish sheets
No.8 mirror is polished and buffed for signage, décor and cleanroom surfaces. 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 sheet is formed and finished for visible or hygienic surfaces. 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 Mirror No.8 Finish Sheet 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 Mirror No.8 Finish Sheet 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.
Other SS 347 sheets
SS 347 Mirror No.8 Finish Sheets for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiSS 347 Mirror No.8 Finish Sheet — questions buyers ask
How is mirror finish protected?
With a laser-grade PVC film that stays on until installation.
Which standard covers SS 347 mirror no.8 finish sheets?
The material is ASTM A240; dimensions follow ASTM A480 (No.8). Always state both on your purchase order, with the edition if your project specifies one.
What decides the price of a SS 347 mirror no.8 finish sheet?
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