SS 347 Mother CoilASTM A240 · ASTM A480 / mill standard · Manufacturer, stockist & exporter, India
AISI 347 · UNS S34700
An SS 347 mother coil is full-width coil straight from the rolling mill, made from SS 347 to ASTM A240. Mother coils are bought by service centres and tube mills for slitting and processing.
- ASTM A240
- ASTM A480 / mill standard
- 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 Mother Coil?
- What it is
- Full-width coil straight from the rolling mill
- Material
- ASTM A240
- Dimensions
- ASTM A480 / mill standard
- Grade
- SS 347 · UNS S34700
- Best at
- Welded high-temperature piping in refineries and power plants
SS 347 Mother Coil Specification
| Product | SS 347 Mother Coil |
|---|---|
| Material standard | ASTM A240 |
| Dimensional standard | ASTM A480 / mill standard |
| Thickness | 0.1 – 6 mm by route |
| Width | Mill width or slit to order |
| Testing | PMI · dimensional · NDT and IGC on request |
| Documents | EN 10204 3.1 · 3.2 with third-party inspection |
When to Choose a Mother Coil
Mother coils are bought by service centres and tube mills for slitting and processing.
- Full mill width
- Hot or cold rolled
- Heavy coil weights
More on choosing: Mother coil guide.
SS 347 Mother Coil: Why 347 for mother coils
Mother coils are bought by service centres and tube mills for slitting and processing. 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 coil feeds stamping, tube-making and roll-forming lines. SS 347 is picked for welded high-temperature piping in refineries and power plants. |
|---|---|
| Typical service | Refinery hydroprocessing — Reactor effluent piping and exchangers. |
SS 347 Mother Coil 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 Mother Coil 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 Mother Coils for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiSS 347 Mother Coil — questions buyers ask
What width is a mother coil?
Full mill width, typically 1000 – 1600 mm depending on the mill.
Which standard covers SS 347 mother coils?
The material is ASTM A240; dimensions follow ASTM A480 / mill standard. Always state both on your purchase order, with the edition if your project specifies one.
What decides the price of a SS 347 mother coil?
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