Stainless Steel 304 Welded / ERW Micro Tubes Manufacturer and Supplier in India
Stainless Steel 304 Welded / ERW Micro Tubes are precision, thin wall tubes formed from flat-rolled stainless steel strips and available in small diameter. The strip is formed into a tube and longitudinally welded by ERW, TIG or laser. Following the welding process, the tubes are then subjected to cold drawing/redrawing in order to attain precise OD, ID, wall thickness, and weld seam dimensions. The SS Grade 304 is an austenitic chromium nickel stainless steel material which has good strength as well as resistance to atmospheric corrosion. In cases where frequent welding/brazing of parts occurs, then the SS 304L is recommended since the carbon content does not exceed 0.030% hence minimizing carbide formation. Amardeep Steel manufactures and supplies these precision micro tubes in different sizes and specifications to meet the requirements of various industrial applications.
Technical Data
SS 304 / 304L Welded & ERW Micro Tube Specifications
| Attribute | Specification Details |
|---|---|
Material Grades | SS 304 (UNS S30400 / 1.4301), SS 304L (UNS S30403 / 1.4307) |
Manufacturing Process | Electric Resistance Welded (ERW), TIG Welded, Laser Welded + Cold Redrawn |
Outer Diameter (OD) | 1.00 mm to 6.35 mm (0.040″ to 0.250″) |
Wall Thickness (WT) | 0.10 mm to 0.90 mm (0.004″ to 0.035″) |
Supply Forms | Straight cut-to-length (up to 6 meters), continuous wound coils, spools |
Material Tempers | Annealed (Soft), 1/4 Hard, 1/2 Hard, Full Hard |
Surface Finishes | Bright Annealed (BA), Pickled, Mechanically Polished, Passivated |
Dimensional Standards | ASTM A269, ASTM A249, ASTM A554, EN 10217-7 |
Certification | EN 10204 3.1 / 3.2 Material Test Certificate, PMI Test Reports |
Chemical Composition of Stainless Steel 304 Welded / ERW Micro Tubes
| Grade / Element (%) | Chromium (Cr) | Nickel (Ni) | Carbon (C) | Manganese (Mn) | Silicon (Si) | Phosphorus (P) | Sulfur (S) | Nitrogen (N) | Iron (Fe) |
|---|---|---|---|---|---|---|---|---|---|
SS 304 (UNS S30400) | 18.00 – 20.00 | 8.00 – 10.50 | 0.08 Max | 2.00 Max | 0.75 Max | 0.045 Max | 0.030 Max | 0.10 Max | Balance |
SS 304L (UNS S30403) | 18.00 – 20.00 | 8.00 – 12.00 | 0.030 Max | 2.00 Max | 0.75 Max | 0.045 Max | 0.030 Max | 0.10 Max | Balance |
Mechanical Properties of Stainless Steel 304 Welded / ERW Micro Tubes
| Condition / Property | Tensile Strength, Min. | Yield Strength (0.2% Offset), Min. | Elongation (in 2 inches), Min. | Hardness (Rockwell B), Max. | Hardness (Brinell), Max. |
|---|---|---|---|---|---|
SS 304 (Annealed Condition) | 75 ksi / 515 MPa | 30 ksi / 205 MPa | 40% | HRB 92 | HBW 201 |
SS 304L (Annealed Condition) | 70 ksi / 485 MPa | 25 ksi / 170 MPa | 40% | HRB 92 | HBW 201 |
Equivalent Grades of Stainless Steel 304 Welded / ERW Micro Tubes
| Product Application | International / USA (ASTM / ASME) | European Union (EN) | Japan (JIS) | United Kingdom (BS) | Germany (DIN) | Sweden (SS) | Russia (GOST) |
|---|---|---|---|---|---|---|---|
SS 304 Welded / ERW Micro Tubes | ASTM A249 / A269 / A632 (UNS S30400 / TP304) | EN 10217-7 / EN 10088-2 (1.4301 / X5CrNi18-10) | JIS G3447 / G3463 (SUS 304) | BS 6362 / BS 3605 (304S31 / En 58E) | DIN 17457 / 17440 (W.Nr. 1.4301) | SS 14 2332 (SS 2332) | GOST 9941 / 5632 (08X18H10) |
Wall Thickness Chart of Stainless Steel 304 Welded / ERW Micro Tubes
| Outside Diameter (OD) in. | Outside Diameter (OD) mm | Extra Thin Wall (WT) in. / mm | Thin Wall (WT) in. / mm | Standard Wall (WT) in. / mm | Heavy Wall (WT) in. / mm |
|---|---|---|---|---|---|
0.050″ | 1.27 mm | 0.005″ (0.13 mm) | 0.008″ (0.20 mm) | 0.010″ (0.25 mm) | 0.012″ (0.30 mm) |
0.062″ (1/16″) | 1.59 mm | 0.006″ (0.15 mm) | 0.010″ (0.25 mm) | 0.014″ (0.35 mm) | 0.020″ (0.50 mm) |
0.094″ (3/32″) | 2.38 mm | 0.008″ (0.20 mm) | 0.012″ (0.30 mm) | 0.016″ (0.40 mm) | 0.022″ (0.55 mm) |
0.125″ (1/8″) | 3.18 mm | 0.010″ (0.25 mm) | 0.016″ (0.40 mm) | 0.020″ (0.50 mm) | 0.028″ (0.71 mm) |
0.156″ (5/32″) | 3.97 mm | 0.010″ (0.25 mm) | 0.020″ (0.50 mm) | 0.028″ (0.71 mm) | 0.035″ (0.89 mm) |
0.188″ (3/16″) | 4.76 mm | 0.012″ (0.30 mm) | 0.020″ (0.50 mm) | 0.028″ (0.71 mm) | 0.035″ (0.89 mm) |
0.250″ (1/4″) | 6.35 mm | 0.016″ (0.40 mm) | 0.028″ (0.71 mm) | 0.035″ (0.89 mm) | 0.049″ (1.24 mm) |
0.312″ (5/16″) | 7.94 mm | 0.020″ (0.50 mm) | 0.028″ (0.71 mm) | 0.035″ (0.89 mm) | 0.049″ (1.24 mm) |
0.375″ (3/8″) | 9.53 mm | 0.020″ (0.50 mm) | 0.035″ (0.89 mm) | 0.049″ (1.24 mm) | 0.065″ (1.65 mm) |
0.500″ (1/2″) | 12.70 mm | 0.028″ (0.71 mm) | 0.035″ (0.89 mm) | 0.049″ (1.24 mm) | 0.065″ (1.65 mm) |
Pressure Rating Chart of Stainless Steel 304 Welded / ERW Micro Tubes
| Outer Diameter (OD) | Wall Thickness (WT) | Min. Tensile Strength (PSI) | Min. Yield Strength (PSI) | Theoretical Burst Pressure (PSI) | Theoretical Yield Point (PSI) | Working Pressure (25% Burst) (PSI) | Collapse Pressure (PSI) |
|---|---|---|---|---|---|---|---|
0.250″ | 0.020″ | 75,000 | 30,000 | 14,286 | 5,714 | 3,571 | 4,416 |
0.250″ | 0.035″ | 75,000 | 30,000 | 29,167 | 11,667 | 7,292 | 7,224 |
0.250″ | 0.065″ | 75,000 | 30,000 | 81,250 | 32,500 | 20,313 | 11,544 |
Types of Stainless Steel 304 Welded / ERW Micro Tubes
Stainless Steel Welded Pipe Astm A312
ASTM A312 ERW Pipe
SS ERW Round Pipe
SS Welded Pipe
ASME B36.10 SS Welded Pipe
Welded Austenitic Stainless Steel Pipes
ASTM A312 Stainless Steel Welded Pipe
Schedule 40 SS Welded High Pressure Tube
1/4 In X 10 Ft Stainless Steel Welded Pipe
Custom Size 5 Inch Stainless Steel Pipe
4 Inch Stainless Steel Welded Pipe
6 inch welded pipe Stainless steel
Schedule 80 SS Welded Pipe
1/2" X 10 Ft. SS Welded Pipe, Pipe Schedule 40
ASME SA312 Spiral Welded Pipe
3/4" X 10 Ft. Stainless Steel Pipe, Pipe Schedule 40
Stainless Steel Spiral Pipe
Stainless Steel Spiral Welded Pipe
Spiral Wound Stainless Steel Pipe
Large Diameter Stainless Steel Welded Pipe
Applications and Industrial Uses of Stainless Steel 304 Welded / ERW Micro Tubes
- Instrumentation and Control Lines
- Chemical Process Instrumentation
- Oil & Gas Instrumentation Systems
- Hydraulic and Pneumatic Control Systems
- Heat Exchanger and Condenser Systems
- Pharmaceutical Processing Equipment
- Food and Beverage Processing Equipment
- Semiconductor and High-Purity Gas Systems
Frequently Asked Questions
What are Stainless Steel 304 Welded / ERW Micro Tubes?
They are small-diameter tubes made from SS 304 strip and joined along the length by welding, such as ERW. They are used where accurate dimensions and corrosion resistance are required.
What are SS 304 Welded Micro Tubes used for?
They are used for instrumentation, fluid lines, process equipment, and hydraulic applications where corrosion-resistant tubing is required.
Are SS 304 Welded Micro Tubes corrosion resistant?
Yes. SS 304 provides good corrosion resistance for general service and atmospheric environments.
What is the difference between SS 304 seamless and welded micro tubes?
Seamless tubes are manufactured without a weld seam, while welded tubes are formed from strip and joined longitudinally. Both can be suitable for corrosion-resistant service when properly specified.
Are SS 304 ERW Micro Tubes suitable for high-pressure applications?
Yes, when manufactured and specified for the required pressure service. High-pressure applications require appropriate wall thickness, strength condition, testing, and design verification.
Can SS 304 ERW Micro Tubes be used in hydraulic systems?
Yes. Welded 304/304L stainless steel tubing is specifically covered by SAE standards for hydraulic lines and other corrosion-resistant applications.
