USA Piping Solution is a trusted supplier of Stainless Steel 420 Welded Tubes and SS 420 ERW Tubing to industrial customers in USA and worldwide. ASTM A268 TP420 Welded Tubes are made from flat stainless steel strip rolled into tubes with the seam welded by processes of Electric Resistance Welding (ERW) or Electric Fusion Welding (EFW). Welded Manufacturing Route is a cost efficient solution for seamless manufacturing and can be used to achieve a wider diameter range and faster delivery from stock for Stainless Steel 420 Welded Tubes. When used in the annealed condition, SS 420 Welded Tubes exhibit the same basic material characteristics as their seamless counterparts: good ductility, machinability and moderate corrosion resistance. The higher carbon content of UNS S42000 compared to Type 410 results in a higher hardness that can be achieved through heat treatment, when required by the application, in TP420 Welded Tubes. Alloy 420 Welded Tubes develop a close adhesion of chromium oxide on the surface which helps in resisting atmospheric corrosion, attack by potable water and mild organic and mineral acids. USA Piping Solution provides 3.1 mill test certificates, dimensional inspection reports and export packing for Stainless Steel 420 Welded Tubes to all parts of USA and abroad.
SS 420 Welded Tubes Specifications
Specification | Details |
|---|---|
Standard | ASTM A268 / ASME SA268 / ASTM A312 / ASTM A249 |
Grade | TP420 / AISI 420 / SS 420 |
UNS No. | UNS S42000 |
DIN / EN No. | DIN 1.4021 / X20Cr13 |
Manufacture Process | Welded (ERW / EFW) |
Size Range (ERW) | 1/2” NB to 24” NB |
Size Range (EFW) | 6” NB to 100” NB |
General Tube Size (OD) | 6.35 mm to 609.6 mm |
Wall Thickness | 0.5 mm to 20 mm |
Length | Single / Double Random / Cut to Length (as per order) |
End Condition | Plain End / Beveled End |
Surface Finish | 2B / No.1 (HR) / Polished (No.4, BA, Mirror) |
Hardness (Annealed) | Max 97 HRB / Max 241 HBW |
Testing | Hydrostatic, Eddy Current, PMI, Flattening Test, Dimensional Inspection |
Documentation | EN 10204 3.1 MTCs, Mill Test Reports, NABL Lab Reports |
Types of Stainless Steel 420 Welded Tubes
- SS 420 ERW Round Welded Tubes
- SS 420 EFW Large Diameter Welded Tubes
- SS 420 Welded Square Tubes
- SS 420 Welded Rectangular Tubes
- ASTM A268 TP420 Welded Instrumentation Tubes
- SS 420 HFW (High Frequency Welded) Tubes
- TP420 Polished Welded Tubes (Mirror / Hairline / Satin)
- UNS S42000 Welded Coiled Tubes
- SS 420 Sanitary Welded Tubes (for mild acid food service)
SS 420 Welded Tubes to ASTM A268 — ERW up to 609.6 mm OD, EFW up to 100-inch NB, annealed condition with PWHT guidance available.
Contact USA Piping Solution for project-specific pricing.
Get a QuoteChemical Composition of SS 420 Welded Tubes (UNS S42000)
Element | Min (%) | Max (%) |
|---|---|---|
Carbon (C) | 0.15 | - |
Manganese (Mn) | - | 1.00 |
Phosphorus (P) | - | 0.040 |
Sulfur (S) | - | 0.030 |
Silicon (Si) | - | 1.00 |
Chromium (Cr) | 12.00 | 14.00 |
Nickel (Ni) | - | - |
Iron (Fe) | Balance | Balance |
Mechanical Properties of ASTM A268 TP420 Welded Tubes
Property | Annealed Condition |
|---|---|
Tensile Strength (min) | 620 MPa (90 ksi) |
Yield Strength 0.2% Proof (min) | 450 MPa (65 ksi) |
Elongation in 50 mm (min) | 15% |
Hardness (max) | 97 HRB / 241 HBW |
Density | 7.74 g/cm3 |
Oxidation Resistance (Continuous) | Up to 650 deg C (1200 deg F) |
Post-Weld Heat Treatment (PWHT) for TP420 Welded Tubes
Post-weld heat treatment is important for TP420 Welded Tubes to minimize the risk of hardening and cracking in the heat-affected zone (HAZ) during and after welding. The following parameters are recommended:
Step | Temperature / Procedure |
|---|---|
Preheat before welding | 150 to 260 deg C (300 to 500 deg F) |
Post-weld anneal (stress relief) | 650 to 760 deg C (1200 to 1400 deg F), air cool |
Full post-weld anneal | 830 to 885 deg C (1525 to 1625 deg F), slow furnace cool |
Filler Metal (if required) | AWS E/ER 420 or AWS E/ER 309L for as-welded ductile joints |
Cooling Requirement | Avoid rapid cooling through the 425 to 595 deg C range (embrittlement zone) |
Applications of SS 420 Welded Tubes
- Chemical plant fabrication and process lines in mild acid service
- Food industry equipment and conveyor tubing
- Water treatment plant structural tubing
- Mining and mineral processing equipment
- Oil refinery mild service lines and structural sections
- Automotive trim, exhaust, and decorative sections
- Marine structural components
- Architectural cladding, railings, and facades
- Pump bodies and housing fabrications
- Equipment manufacturing for aluminium and steel plants
- Industrial construction frameworks and support structures
Related Products
- Stainless Steel 420 Tubes
- Stainless Steel 420 Seamless Tubes
- Stainless Steel 410 Seamless Tubes
- Stainless Steel 410 Welded Tubes
- Stainless Steel 409 Pipes and Tubes
Frequently Asked Questions
Do you maintain stock of SS 420 Welded Tubes for fast dispatch?
Yes, we maintain stocking inventory of commonly ordered SS 420 Welded Tube sizes, allowing faster dispatch compared to fully made-to-order production runs.
Can SS 420 Welded Tubes be supplied with a sanitary food-grade finish?
Yes, SS 420 Sanitary Welded Tubes with smooth internal bores and polished finishes are available for mild-acid food processing and conveyor applications.
What filler metal is recommended when field-welding SS 420 tubes?
AWS E/ER 420 filler is typically recommended for matching properties, while AWS E/ER 309L is used where as-welded ductility is more important than hardness.
How do I open a stocking distributor account for repeat orders?
Contact our sales team with your expected order volume and frequency. We'll set up a stocking distributor account with agreed pricing and priority lead times.
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