Stainless Steel 347 / 347H Coil/Foil/Shim Supplier, Exporter & Manufacturer in Mumbai, India

Stainless Steel 347/347H Coils, Foils, and Shims are manufactured from niobium-stabilized austenitic stainless steel alloys containing chromium, nickel, niobium, and controlled levels of carbon, along with other alloying elements. Each constituent contributes to the material’s overall performance, providing a combination of corrosion resistance, mechanical strength, toughness, thermal stability, and durability for demanding industrial applications. Chromium forms a protective passive film on the surface, helping minimize corrosion and oxidation, while nickel enhances toughness and supports corrosion resistance. Niobium helps stabilize the steel against harmful chromium carbide precipitation during exposure to elevated temperatures, supporting resistance to intergranular corrosion under suitable service conditions. Grade 347H contains a higher carbon level than standard 347, which improves creep strength for certain elevated-temperature applications. Depending on project requirements, Stainless Steel 347/347H Coils, Foils, and Shims can be supplied in different thicknesses, widths, lengths, coil dimensions, shim sizes, surface finishes, dimensional tolerances, and manufacturing specifications. Their combination of corrosion resistance, thermal stability, mechanical integrity, dimensional consistency, and long-term durability makes them suitable for applications across chemical processing, petrochemical facilities, power generation, heat exchangers, high-temperature process equipment, industrial machinery, fabrication, precision engineering, and general industrial manufacturing. The appropriate grade, product form, and material specification can be selected according to operating temperature, environmental exposure, fabrication requirements, and applicable industry standards to support reliable performance in the intended service environment.

Specification	SS 347	SS 347H
ASTM Standard	ASTM A240	ASTM A240
ASME Standard	SA 240	SA 240
UNS	S34700	S34709
Werkstoff No.	1.4550	1.4961
EN / DIN	X6CrNiNb18-10	X6CrNiNb18-10*
Product Forms	Coil, Foil, Shim, Sheet, Strip, Plate	Coil, Foil, Shim, Sheet, Strip, Plate
Manufacturing Process	Hot Rolled / Cold Rolled	Hot Rolled / Cold Rolled
Finish	2B, BA, No. 1, No. 4, Mirror	2B, BA, No. 1, No. 4, Mirror
Thickness	As per customer requirements	As per customer requirements
Width	As per customer requirements	As per customer requirements
Edge	Mill Edge / Slit Edge	Mill Edge / Slit Edge
Condition	Annealed	Annealed

Specification

SS 347

SS 347H

ASTM Standard

ASTM A240

ASME Standard

SA 240

UNS

S34700

S34709

Werkstoff No.

1.4550

1.4961

EN / DIN

X6CrNiNb18-10

X6CrNiNb18-10*

Product Forms

Coil, Foil, Shim, Sheet, Strip, Plate

Manufacturing Process

Hot Rolled / Cold Rolled

Finish

2B, BA, No. 1, No. 4, Mirror

Thickness

As per customer requirements

Width

As per customer requirements

Edge

Mill Edge / Slit Edge

Condition

Annealed

Chemical Element	SS 347 (%)	SS 347H (%)
Carbon (C)	0.08 max.	0.04–0.10
Chromium (Cr)	17.0–19.0	17.0–19.0
Nickel (Ni)	9.0–13.0	9.0–13.0
Manganese (Mn)	2.00 max.	2.00 max.
Silicon (Si)	0.75 max.	0.75 max.
Phosphorus (P)	0.045 max.	0.045 max.
Sulfur (S)	0.030 max.	0.030 max.
Niobium + Tantalum (Nb + Ta)	10 × C min.; 1.00 max.	8 × C min.; 1.00 max.
Iron (Fe)	Balance	Balance

Chemical Element

SS 347 (%)

SS 347H (%)

Carbon (C)

0.08 max.

0.04–0.10

Chromium (Cr)

17.0–19.0

Nickel (Ni)

9.0–13.0

Manganese (Mn)

2.00 max.

Silicon (Si)

0.75 max.

Phosphorus (P)

0.045 max.

Sulfur (S)

0.030 max.

Niobium + Tantalum (Nb + Ta)

10 × C min.; 1.00 max.

8 × C min.; 1.00 max.

Iron (Fe)

Balance

Mechanical Property	SS 347	SS 347H
Tensile Strength	515 MPa (75 ksi) min.	515 MPa (75 ksi) min.
Yield Strength (0.2% offset)	205 MPa (30 ksi) min.	205 MPa (30 ksi) min.
Elongation	40% min.	40% min.
Hardness	201 HBW max.	201 HBW max.

Mechanical Property

SS 347

SS 347H

Tensile Strength

515 MPa (75 ksi) min.

Yield Strength (0.2% offset)

205 MPa (30 ksi) min.

Elongation

40% min.

Hardness

201 HBW max.

Physical Property	SS 347	SS 347H
Density	7.96 g/cm³	7.96 g/cm³
Melting Range	1398–1446°C	1398–1446°C
Specific Heat Capacity	500 J/kg·K	500 J/kg·K
Thermal Conductivity (at 100°C)	16.3 W/m·K	16.3 W/m·K
Electrical Resistivity (at 20°C)	72 µΩ·cm	72 µΩ·cm
Modulus of Elasticity	193 GPa	193 GPa
Poisson’s Ratio	0.30	0.30
Coefficient of Thermal Expansion (20–100°C)	16.0 × 10⁻⁶/K	16.0 × 10⁻⁶/K
Magnetic Properties (Annealed)	Generally non-magnetic; may become slightly magnetic after cold working	Generally non-magnetic; may become slightly magnetic after cold working

Physical Property

SS 347

SS 347H

Density

7.96 g/cm³

Melting Range

1398–1446°C

Specific Heat Capacity

500 J/kg·K

Thermal Conductivity (at 100°C)

16.3 W/m·K

Electrical Resistivity (at 20°C)

72 µΩ·cm

Modulus of Elasticity

193 GPa

Poisson’s Ratio

0.30

Coefficient of Thermal Expansion (20–100°C)

16.0 × 10⁻⁶/K

Magnetic Properties (Annealed)

Generally non-magnetic; may become slightly magnetic after cold working

Stainless Steel 347/347H Coils, Foils, and Shims are widely used in industrial applications where corrosion resistance, mechanical reliability, thermal stability, dimensional precision, and long-term material performance are essential. Their niobium-stabilized composition makes them suitable for certain elevated-temperature applications, while the chromium and nickel content contributes to corrosion resistance and overall material durability. Grade 347H, with its higher carbon content, provides improved creep strength for specific high-temperature service conditions. These products are commonly utilized in chemical processing, petrochemical plants, power generation, heat exchangers, high-temperature process equipment, industrial machinery, fabrication, precision engineering, and specialized equipment manufacturing. Depending on the application and project specifications, they can be supplied as coils, thin-gauge foils, and precision shims, with different thicknesses, widths, lengths, dimensions, and surface finishes to suit specific fabrication and operating requirements. Their resistance to intergranular corrosion under suitable conditions, combined with appropriate mechanical properties and fabrication suitability, makes them a practical choice for industrial components, thermal equipment, precision assemblies, and specialized engineering projects. Proper material selection remains important, as corrosion resistance and service performance depend on temperature, chemical concentration, environmental exposure, fabrication methods, and other operating conditions. With their combination of corrosion resistance, thermal stability, mechanical strength, dimensional consistency, and durability, Stainless Steel 347/347H Coils, Foils, and Shims offer a dependable material solution for demanding industrial environments where reliability and extended service life are important.