Stainless Steel 441 ERW Pipes & Tubes are dual stabilized ferritic tubes produced to UNS S44100, EN 1.4509 (X2CrTiNb18). Ti and Nb additions prevent weld zone sensitization and ensure excellent oxidation resistance and heat resistance to thermal cycles of heating and cooling. The tubes are produced from steel strip and welded using electric resistance welding. Typical uses are automotive exhaust systems and manifolds, heat exchangers, furnace equipment and catering equipment. Amardeep Steel is a manufacturer and supplier of Stainless Steel 441 ERW Pipes & Tubes in India.
Technical Data
Specifications of Stainless Steel 441 ERW Pipes & Tubes
Attribute | Technical Parameter |
|---|---|
Grade & Designation | AISI 441 / UNS S44100 / EN 1.4509 |
Microstructural Family | Ferritic Stainless Steel (Dual Ti + Nb Stabilized) |
Manufacturing Process | Electric Resistance Welded (ERW) |
Governing Specifications | ASTM A268 / ASME SA268 (Note: A731 was withdrawn by ASTM) |
Chromium Range | 17.50% to 19.50% |
Min. Tensile Strength | 427 MPa (62 ksi) |
Min. Yield Strength (0.2% Offset) | 248 MPa (36 ksi) |
Min. Elongation | 18% in 2 inches |
Max. Hardness | Per ASTM A268 specification |
Primary Industrial Uses | Automotive exhaust systems & manifolds, heat exchangers, food equipment |
Chemical Compositions of SS 441 ERW Pipes & Tubes
Chemical Element | Specification Limit (% Mass) |
|---|---|
Chromium (Cr) | 17.50 to 19.50 |
Titanium (Ti) | 0.10 to 0.50 |
Niobium (Nb) | 0.30 + 9 × C min, 0.90 max |
Carbon (C) | 0.03 max |
Manganese (Mn) | 1.00 max |
Silicon (Si) | 1.00 max |
Phosphorus (P) | 0.040 max |
Sulfur (S) | 0.030 max (ASTM A240 limit) |
Nickel (Ni) | 1.00 max |
Nitrogen (N) | 0.03 max |
Iron (Fe) | Balance |
Stainless Steel 441 ERW Pipes & Tubes Mechanical Properties
Mechanical Property | Specification Minimum | Typical Value (Reference Only) |
|---|---|---|
Tensile Strength (Ultimate) | 427 MPa (62 ksi) | 520 to 560 MPa (75.4 to 81.2 ksi) |
Yield Strength (0.2% Offset) | 248 MPa (36 ksi) | 335 to 365 MPa (48.6 to 52.9 ksi) |
Elongation (in 2 in / 50 mm) | 18% min | 34.0% to 38.0% |
Hardness (Rockwell B) | Per the tube specification | 72 to 76 HRB |
Equivalent Grades of Stainless Steel 441 ERW Pipes & Tubes
Standard | Designation |
|---|---|
UNS | S44100 |
EN / Werkstoff No. | 1.4509 |
EN Name | X2CrTiNb18 |
AISI | 441 |
JIS | SUS 441 |
Dimensions Chart of Stainless Steel 441 ERW Pipes & Tubes
Dimensional Parameter | ERW Manufacturing Capabilities |
|---|---|
Outer Diameter (OD) | 12.70 mm to 114.30 mm OD |
Wall Thickness (WT) | 0.80 mm to 4.50 mm (SWG 10 to SWG 22) |
Tube/Pipe Lengths | Single Random, Double Random, 6 Meter Fixed, or Cut-to-Length |
End Configurations | Square Cut Plain Ends (PE), Deburred Ends, Beveled Ends (BE) |
Surface Conditions | Mill Finish (2B), Bright Annealed (BA), Mechanical Polish (180, 240, 320 Grit) |
Dimensional Tolerances | Per ASTM A268 |
Applications and Industrial Uses of Stainless Steel 441 ERW Pipes & Tubes
- Automotive Exhaust Systems
- Exhaust Manifolds
- Heat Exchanger Components
- Furnace and Heating Equipment
- Commercial Catering Equipment
- Thermal Processing Equipment
- High-Temperature Industrial Piping
Frequently Asked Questions
What is Stainless Steel 441?
Stainless Steel 441 (UNS S44100 / EN 1.4509) is a titanium- and niobium-stabilized ferritic stainless steel with good heat resistance, oxidation resistance, and formability.
Is Grade 441 available in ERW (Electric Resistance Welded) form?
Yes, Grade 441 is available in ERW form and is commonly used for exhaust, heat-transfer, and other elevated-temperature applications.
What is the difference between SS 441 ERW and Seamless tubing?
SS 441 ERW tubing is formed from steel strip and longitudinally welded, while seamless tubing is produced without a welded seam. ERW tubing generally offers good dimensional control and cost efficiency.
What specification governs SS 441 ERW pipe and tube?
SS 441 tubular products are commonly specified to ASTM A268. The applicable specification should be confirmed based on the product form and application.
Why is Grade 441 preferred over Grade 430 or Grade 439 for exhaust systems?
Grade 441 uses both titanium and niobium stabilization, providing good high-temperature strength, thermal fatigue resistance, and oxidation resistance for exhaust applications.
Is Stainless Steel 441 magnetic?
Yes, Stainless Steel 441 is a ferritic stainless steel and is normally magnetic.
What sizes are available in SS 441 ERW pipes?
SS 441 ERW Pipes and Tubes can be supplied in various outside diameters, wall thicknesses, and cut lengths, depending on the manufacturer's production capabilities and project requirements.
