Stainless steel 429 ERW pipes and tubes are ferritic types of tubes which have been manufactured according to the specification of UNS S42900 (AISI 429). Stainless steel 429 contains 14-16% chromium and has an alloy content between 410 and 430 types. It is magnetic and can be welded effectively at high temperature levels. These tubes are used in exhaust parts, furnace equipment, heat exchanger assemblies and appliance parts. Amardeep Steel Centre supplies them in India for industrial and export orders.
Technical Data
Specifications of SS 429 ERW Pipes & Tubes
Specification Parameter | Technical Detail |
|---|---|
Material Grade | SS 429 / AISI 429 / Type 429 |
UNS Designation | UNS S42900 |
EN / Werkstoff Equivalent | No exact EN match. Closest: 1.4001 (X7Cr14) |
Applicable Standards | ASTM A268 / ASME SA268 (Welded & Seamless Ferritic/Martensitic Tubing) |
Manufacturing Type | Electric Resistance Welded (ERW) / High-Frequency Induction Welded |
Form Factor | Round Pipes, Square/Rectangular Tubing, Custom Profiles |
Surface Finishes | Mill Finish (2B), Bright Annealed (BA), Satin/Polished (180/320 Grit) |
Certifications & Compliance | EN 10204 3.1 / 3.2 MTC |
Chemical Compositions of Stainless Steel 429 ERW Pipes & Tubes
Chemical Element | Specification Limit (% Mass) |
|---|---|
Chromium (Cr) | 14.00 to 16.00 |
Carbon (C) | 0.12 Max |
Manganese (Mn) | 1.00 Max |
Silicon (Si) | 1.00 Max |
Phosphorus (P) | 0.040 Max |
Sulfur (S) | 0.030 Max |
Nickel (Ni) | 0.50 Max |
Iron (Fe) | Balance |
Stainless Steel 429 ERW Pipes & Tubes Mechanical Properties
Mechanical Property | ASTM A268 Minimum Requirement | Typical Value (Reference Only) |
|---|---|---|
Tensile Strength (Ultimate) | 415 MPa (60,000 psi) | 480 to 520 MPa (69,600 to 75,400 psi) |
Yield Strength (0.2% Offset) | 240 MPa (35,000 psi) | 275 to 310 MPa (39,800 to 44,900 psi) |
Elongation in 2 in (50 mm) | 20% min | 25.0% to 28.0% |
Hardness (Rockwell B) | 88 HRB max, annealed | 78 to 84 HRB |
Hardness (Brinell) | 183 HBW max, annealed | 150 to 170 HBW |
Physical Properties of SS 429 ERW Pipes & Tubes
Physical Property | Metric Value | Imperial Equivalent |
|---|---|---|
Density | 7.75 g/cm³ (7,750 kg/m³) | 0.280 lb/in³ |
Modulus of Elasticity (E) | 200 GPa | 29,000 ksi |
Thermal Conductivity(at 100 °C) | 24.9 W/m·K | 14.4 Btu/ft·h·°F |
Electrical Resistivity(at 20 °C) | 600 nΩ·m | 60.0 µΩ·cm |
Specific Heat Capacity(0 to 100 °C) | 460 J/kg·K | 0.11 Btu/lb·°F |
Coeff. of Thermal Expansion(0 to 100 °C) | 10.4 µm/m·K | 5.8 µin/in·°F |
Range and Dimensions Chart of SS 429 ERW Pipes & Tubes
Dimensional Parameter | Manufacturing Range Capabilities |
|---|---|
Outer Diameter (OD) | 12.70 mm to 114.30 mm OD |
Wall Thickness (WT) | 0.80 mm to 4.50 mm (mm or SWG) |
Pipe / Tube Length | 6.0 Meters, 12.0 Meters, or Precision Cut-to-Length Parts |
Surface Condition | Mill Finish (2B), Bright Annealed (BA), Exterior Polished (180/320 Grit) |
Dimensional Tolerances | Per ASTM A268 |
Applications and Industrial Uses of Stainless Steel 429 ERW Pipes & Tubes
- Automotive Exhaust Systems
- Furnace Tubing
- Heat Exchanger Components
- Industrial Heating Equipment
- Appliance Components
- Boiler and Thermal Equipment
- Industrial Piping Systems
- High-Temperature Fabricated Components
Frequently Asked Questions
What are Stainless Steel 429 ERW Pipes and Tubes?
Stainless Steel 429 ERW Pipes and Tubes are ferritic stainless steel products made using electric resistance welding, offering good corrosion resistance, weldability, and heat resistance.
What is Stainless Steel 429 used for?
Stainless Steel 429 is used for automotive exhaust systems, furnace equipment, heat exchangers, appliances, and other industrial applications.
What is the difference between Stainless Steel 429 and 430?
SS 429 has lower chromium content than SS 430 and is designed for applications requiring moderate corrosion resistance, heat resistance, and weldability.
Is Stainless Steel 429 suitable for high-temperature applications?
Yes, SS 429 can be used in moderately high-temperature applications such as exhaust components, furnace equipment, and thermal systems.
Can Stainless Steel 429 ERW Pipes be welded easily?
Yes, SS 429 has good weldability and can be welded using suitable conventional welding methods with proper fabrication practices.
Is Stainless Steel 429 magnetic?
Yes, Stainless Steel 429 is ferritic and normally magnetic.
Can Stainless Steel 429 be used for heat exchanger tubes?
Yes, SS 429 can be used for heat exchanger tubes where moderate corrosion resistance and thermal performance are required.
