Stainless Steel 444 ERW pipes and tubes are Ferritic steel pipe/tube containing molybdenum that is in compliance with UNS S44400, EN 1.4521 (X2CrMoTi18-2). Stabilization with titanium/niobium, 1.75%-2.50% molybdenum and extremely low carbon/nitrogen levels provide excellent resistance to pitting corrosion, crevice corrosion and chloride stress corrosion cracking. Low thermal expansion suits systems that heat and cool repeatedly. Typical uses are heat exchangers, solar water heaters, hot water storage and water handling equipment. Amardeep Steel Centre supplies them in India for domestic and export orders.
Technical Data
Specifications of Stainless Steel 444 ERW Pipes & Tubes
Feature / Attribute | Technical Detail |
|---|---|
Material Grade | Stainless Steel 444 (AISI 444 / UNS S44400) |
Structure | Dual-Stabilized (Ti + Nb) Ferritic Stainless Steel |
Manufacturing Process | High-Frequency Electric Resistance Welded (ERW) |
Governing Specifications | ASTM A268 / ASME SA268 (seamless and welded ferritic tubing), ASTM A240 (base sheet and strip) |
Equivalent Standards | EN / DIN 1.4521 (X2CrMoTi18-2), GB 00Cr18Mo2, JIS SUS444 |
Min. Tensile Strength | 415MPa (60ksi) |
Min. Yield Strength (0.2%) | 275MPa (40ksi) |
Min. Elongation (A5) | 20% |
Common Finish Options | Mill Finish, 240 Grit Satin, 320 Grit, up to 800 Grit Mirror Polish |
Chemical Compositions of SS 444 ERW Pipes and Tubes
Element | Chromium (Cr) | Molybdenum (Mo) | Nickel (Ni) | Titanium + Niobium (Ti + Nb) | Carbon (C) | Nitrogen (N) | Manganese (Mn) | Silicon (Si) | Phosphorus (P) | Sulfur (S) | Iron (Fe) |
|---|---|---|---|---|---|---|---|---|---|---|---|
Min. | 17.50 | 1.75 | — | 0.20+4(C+N) | — | — | — | — | — | — | Balance |
Max. | 19.50 | 2.50 | 1.00 | 0.80 | 0.025 | 0.035 | 1.00 | 1.00 | 0.040 | 0.030 | Balance |
Mechanical Properties of Stainless Steel 444 ERW Pipes & Tubes
Property | Tensile Strength, Min. | Yield Strength (0.2% Offset), Min. | Elongation (A5), Min. | Hardness (Rockwell B), Max. | Hardness (Brinell), Max. | Elastic Modulus |
|---|---|---|---|---|---|---|
Specification Value | 415MPa(60ksi) | 275MPa(40ksi) | 20.0% | 90HRB | 217HB | 200GPa |
Typical Tested Range | 460-520MPa | 310-360MPa | 24.0 - 28.0% | 82-86HRB | 170-190HB | 200GPa |
Stainless Steel 444 ERW Pipes and Tubes Physical Properties
Property | Value |
|---|---|
Density | 7.75 g/cm³ |
Thermal Expansion(0 to 100 °C) | 10.4 × 10⁻⁶/K / 10.4 µm/m·K |
Thermal Conductivity(100 °C) | 26.8 W/m·K |
Specific Heat(0 to 100 °C) | 430 J/kg·K |
Electrical Resistivity | 0.60 µΩ·m |
Melting Range | 1425 °C to 1510 °C |
Equivalent Grades of Stainless Steel 44 ERW Pipes and Tubes
Region / Standard Body | USA (ASTM / UNS) | European Union (EN / DIN) | Japan (JIS) | China (GB) | International (ISO) |
|---|---|---|---|---|---|
Designation Code | UNS S44400 / Grade 444 | 1.4521 / X2CrMoTi18-2 | SUS444 | 00Cr18Mo2 / 022Cr19Mo2Ti | 4521-444-00-I |
Governing Spec | ASTM A268 / ASTM A240 | EN 10217-7 / EN 10088-2 | JIS G4305 | GB/T 3280 / GB/T 12771 | ISO 15510 |
Dimensions Chart of SS 444 ERW Pipes and Tubes
Dimensional Parameter | ERW Manufacturing Range |
|---|---|
Outside Diameter (Round) | 12.70 mm to 114.30 mm |
Wall Thickness | 0.80 mm to 4.50 mm |
Length | 6.0 m, 12.0 m, or custom cut-to-length |
Dimensional Tolerance | Standard per ASTM A268 |
Applications and Industrial Uses of Stainless Steel 444 ERW Pipes & Tubes
- Heat Exchanger Tubes
- Solar Water Heaters
- Hot Water Storage Systems
- Potable Water Piping
- Industrial Water Treatment Equipment
- Food Processing Equipment
- Chemical Processing Equipment
- Exhaust and Thermal Systems
Frequently Asked Questions
What are Stainless Steel 444 ERW Pipes and Tubes?
Stainless Steel 444 ERW Pipes and Tubes are molybdenum-bearing ferritic stainless steel products made by electric resistance welding, offering good corrosion and heat resistance.
What is Stainless Steel 444 used for?
SS 444 is used for heat exchangers, solar water heaters, hot water systems, water-handling equipment, and industrial applications.
What is the difference between Stainless Steel 444 and 316?
SS 444 is a molybdenum-bearing ferritic stainless steel with very low nickel, while SS 316 is an austenitic stainless steel containing nickel and molybdenum.
Why is molybdenum added to Stainless Steel 444?
Molybdenum improves resistance to pitting and crevice corrosion, particularly in chloride-containing environments.
Is Stainless Steel 444 resistant to chloride corrosion?
Yes, SS 444 provides good resistance to pitting, crevice corrosion, and chloride-related corrosion.
Can Stainless Steel 444 be used in solar water heaters?
Yes, SS 444 is suitable for solar water heater components because of its corrosion resistance and low thermal expansion.
Is Stainless Steel 444 suitable for hot water systems?
Yes, SS 444 is commonly used in hot water systems where resistance to corrosion and stress corrosion cracking is required.
Is Stainless Steel 444 magnetic?
Yes, SS 444 is a ferritic stainless steel and is normally magnetic.
