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Sidhgiri Overseas is one of the best SS 304L Tube Suppliers in Canada with the latest cold drawing and extrusion facilities along with high-frequency automated welding machines, endowing them with the capability to provide the highest quality in the field of tubes and pipes.
Stainless steel grade 304L is the extra-low carbon version of the 18-8 (chromium-nickel austenitic) family of steels. It is manufactured from the precision controlled manufacturing process so that the total elemental carbon is always below 0.03%. This is an important measure to prevent the formation of chromium carbides along the grain boundaries during the high-temperature welding process, including manual and automated welding, and thus avoid the formation of degraded structure.
The first step in the risk assessment of sensitisation is to control chemistry. Sidhgiri Overseas refines using state-of-the-art Argon Oxygen Decarburisation (AOD) and Vacuum Oxygen Decarburisation (VOD), which provide precise elemental balance. To avoid local chromium depletion, it is necessary to reduce the concentration of carbon. This means that there is no risk of intergranular pitting or stress corrosion cracking in the heat-affected zones (HAZ), thus avoiding the need for costly solution annealing after welding.
Advanced Thermal Processing: The controlled solution annealing of raw billets between 1040°C and 1120°C followed by fast water quenching is provided in our production mills to optimise mechanical properties. This process stabilises the austenitic microstructural configuration in a reliable manner where pressure containment is guaranteed.
High precision – Cold working is done on high-capacity draw benches and heavy mandrel matrices. This ensures strict adherence to international specifications on wall thickness uniformity, ovality variation and micro-inch surface roughness parameters essential for high-purity cleanroom performance.
Engineered to sustain structural integrity and application safety across high-stress industrial environments, our SS 304L pipes conform to standardized international structural codes. The technical matrix below outlines the exact material, chemical, and testing parameters:
| Specification Parameter | Technical Standard Matrix / Operational Metric |
|---|---|
| Standard Classifications | ASTM A312, ASTM A213, ASTM A249, ASME SA312, ASME SA312, ASME SA249 |
| Dimensional Metrics | ANSI B36.19M, ANSI B36.10M, ASME B36.19 |
| Outside Diameter (OD) | 1/8" NB to 24" NB; custom sizes ranging from 6.00 mm up to 914.4 mm |
| Wall Thickness Range | 0.3 mm up to 50.0 mm (Schedules 5S, 10S, 40S, 80S, 160, XXS) |
| Length Profiles | Single Random (5–7 meters), Double Random (10–14 meters), or Cut-to-Length |
| End Configurations | Plain End (PE), Beveled End (BE), Threaded (Male/Female), Threaded Both Ends (TBE) |
| Surface Finish States | No.1 Pickled, No.4 Brush Finish, No.8 Mirror Polish, 2B Matte, Bright Annealed (BA) |
| Chemical Breakdown | Chromium (18.0%–20.0%), Nickel (8.0%–12.0%), Carbon (0.035% Max), Manganese (2.0% Max) |
| Mechanical Thresholds | Tensile Strength: ≥485 MPa (70 ksi); Yield Strength: ≥170 MPa (25 ksi) |
| Hardness Limits | Rockwell B (HRB) ≤92 Max or Brinell Hardness (HBW) ≤201 Max |
| Testing Regimens | Hydrostatic, Eddy Current, Ultrasonic, Radiography (100% X-Ray), PMI Testing |
Understanding the value of SS 304L requires knowledge of the surface chemistry of the material after passivation. In the atmosphere, the lowest chromium content of 18% will react and create an ultra-thin, self-healing layer of chromium oxide. This passive barrier is to protect the underlying iron matrix from oxygen and to prevent the oxidation process all together.
Carbon atoms are able to diffuse to the grain boundaries during the heavy thermal processing of standard 304 stainless steel in the range of 425∘C to 815∘C and to form chromium carbides that combine chromium and carbon. This localised depletion results in the exposure of the boundaries to aggressive intergranular corrosion. For the final structural assembly, Sidhigiri Overseas is able to completely disrupt this mechanism of chemical bonding so that the structure is not affected by corrosion even after long periods of multi-pass welding.
Based on the fluid dynamics, structural loads and the budget of the projects, clients can choose among various physical setups:
SS 304L Tubing Configurations
|
+-----------------------+-----------------------+
| |
Seamless (SMLS) Welded (WLD)
| |
+--> Hot Extruded / Cold Drawn +--> ERW (Electric Resistance)
+--> EFW (Electric Fusion)
+--> CDW (Cold Drawn Welded)
Seamless Pipes (SMLS): These are pipes that are formed without longitudinal welds through the process of piercing solid steel billets over a piercing mandrel. Designed for use in high-pressure and high-temperature lines that can experience stress fatigue.
Electric Resistance Welded – ERW: Continuous Sheet (Electric Resistance Welded – ERW). Provides an extremely cost-effective solution that has close tolerances.
Electric Fusion Welded (EFW): Made using heavy plate rolling and high-energy electric arcs, with deep weld penetration, validated by continuous radiography testing for thick-walled applications.
Cold Drawn Welded (CDW): Made by pulling a welded base tube through a precision die and a mandrel in the core of the tube. This places the grain in the direction of the seam, and it also drastically diminishes eccentricity and surface roughness.
The price of SS 304L parts varies according to the iron ore, elemental nickel and ferrochromium futures prices on the international market, as well as specific process factors (such as seamless cold drawing and/or high-speed automated material roll-forming).
Premium Seamless Piping (ASTM A312 TP304L): ₹320 – ₹410 per kg depending on size run scales and special heat treatments.
Meanwhile, welded/ERW piping lines (ASTM A312/A249) range from approximately ₹270 to ₹340 per kilogram, making them a cost-effective option for low- to moderate-pressure pipelines.
| Size Designation (NB) | Outside Diameter (OD) | Wall Thickness | Schedule Rating | Approximate Weight | Indicative Price (Canada) |
|---|---|---|---|---|---|
| 15 NB (1/2 Inch) | 21.30 mm | 2.11 mm | Schedule 10S | 1.04 kg/meter | ₹623 per Meter |
| 15 NB (1/2 Inch) | 21.30 mm | 2.77 mm | Schedule 40S | 1.31 kg/meter | ₹789 per Meter |
| 20 NB (3/4 Inch) | 26.70 mm | 2.11 mm | Schedule 10S | 1.33 kg/meter | ₹798 per Meter |
| 20 NB (3/4 Inch) | 26.70 mm | 2.87 mm | Schedule 40S | 1.75 kg/meter | ₹1,052 per Meter |
| 25 NB (1 Inch) | 33.40 mm | 2.77 mm | Schedule 10S | 2.17 kg/meter | ₹1,168 per Meter |
| 25 NB (1 Inch) | 33.40 mm | 3.38 mm | Schedule 40S | 2.60 kg/meter | ₹1,372 per Meter |
| 50 NB (2 Inch) | 60.30 mm | 2.77 mm | Schedule 10S | 4.08 kg/meter | ₹2,193 per Meter |
| 50 NB (2 Inch) | 60.30 mm | 3.91 mm | Schedule 40S | 5.64 kg/meter | ₹2,982 per Meter |
Sidhgiri Overseas has a strong distribution channel in the region, making us the leading SS 304L Tube Suppliers in Canada. Our network is extensive and goes deep into key industrial areas and supply centres locally, meaning we can hold large amounts of stock there and distribute materials on the spot without dealing with long manufacturing lead times.
Precision Pre-processing: Distribution centres have heavy-duty band saws, precision laser-cutting arrays and pipe-bevelling machines capable of high speed to provide pre-configured pipe which is ready for field installation.
Positive Material Identification (PMI): Spectrometers are available in our facilities for the re-verification of alloy chemistry before dispatch, giving absolute traceability to the original steel melt heat sequences, as part of a Non-Destructive Material Validation (NDMV) process.
Third-Party Inspection Coordination: Regularly work with trusted international inspection bodies such as Bureau Veritas, SGS, TUV and Lloyd's Register to meet strict requirements as required by the project.
Maintaining straightness, shiny surfaces and exact bevel angles throughout handling and shipping long distances is an essential objective.
Bundle Strapping & Surface Protection: Piping is bundled in heavy steel bands in a secure hexagonal matrix with a high-density polyethylene (HDPE) plastic sheathing and surface protection and fitted with dedicated lifting straps to prevent metal-on-metal contact.
End caps & thread guarding: Heavy-gauge plastic caps are used on exposed pipe ends to prevent debris from entering and to buffer the structural weld prep angles to prevent impact damage.
Heavy-Duty Wooden Enclosures: Thin walled capillary tubes, instrument lines and electropolished items are packed in completely enclosed wooden crates with shock-absorbing internal framing.
Its consistently predictable mechanical behaviour makes SS 304L truly irreplaceable in demanding processing applications:
Chemical Process Systems: Manages long-distance transport lines for mild organic acids, oxidising fluids and various chemicals where localized weld decay may lead to catastrophic environmental failure.
Food, Beverage, & Dairy Processing: The ultra-smooth inner surfaces provide high value in sanitary circuits, where biological growth is a concern and where aggressive Clean-in-Place (CIP) chemical wash cycles are applied.
Nuclear & Power Generation Lines: Selected for its exceptional low-temperature toughness, high-stress mechanical properties and proven ability to perform at elevated temperatures up to 525°C.
Cold Machining & Bending: High ductility allows for even bending with rotary draw or mandrel benders under high hydraulic force with precise control of the bending rate, considering the natural work-hardening nature of the material.
Welding Integration: Easily weldable with Gas Tungsten Arc Welding (GTAW/TIG), Gas Metal Arc Welding (GMAW/MIG), and Shielded Metal Arc Welding (SMAW). A low-carbon chemistry is maintained that helps prevent corrosion at joint lines without post-weld thermal treatment.
Pickling & Passivation: Chemical immersion of fabricated assemblies in a controlled nitric–hydrofluoric (NF) acid solution to remove oxide scales generated by high-temperature exposure and to immediately regenerate the protective chromium passive layer.
Standard Round Pipes: These are used for structural fluid transport, utility mains and cooling loops.
Square & Rectangular Tubing: Strong and durable structural tubing for equipment frameworks and architectural supports in corrosive applications.
Electropolished Tubing (EP): Ultra-pure, high-purity lines designed for biotechnology, pharmaceutical cleanrooms and semiconductor processing applications.
Heavy-Wall High-Pressure Tubing: Designed for chemical injection systems, high-pressure steam headers and heavy high-pressure hydraulic manifolds.
Sidhgiri Overseas is an established SS 304L Tube Exporter in Canada that works completely in line with world standard frameworks. We arrange imports and exports from countries around the world, from the Middle East to Southeast Asia, South America, Europe and North American distribution centres.
Each shipment of exports is accompanied by full documentation, including European Standard EN10204 Type 3.1 Mill Test Certificates. Located close to the international seaports, we ensure smooth customs clearance, safe container packing and timely delivery for international buyers. We offer a strong product line, from lightweight transport piping (Schedules 5S & 10S) to heavy wall (Schedules 80S & 160S) products, giving users the freedom to choose without incurring lead time during emergency plant shutdowns or fast-track international buildouts.
Our pipes integrate seamlessly into international engineering assemblies by maintaining strict adherence to standard dimensional ratings:
Safe operating pressures are functions of design temperature, pipe diameter, and wall thickness. Governed by ASME B31.3 processing rules and calculated via Barlow’s formula, the maximum allowable pressure scales downward at elevated temperatures as the alloy's mechanical strength undergoes thermal reduction.
The following data table maps the maximum allowable internal working pressures (expressed in pounds per square inch gauge – psig) for seamless ASTM A312 TP304L pipes:
Carbon capped at 0.030% against 0.08% for 304, with chromium and nickel unchanged at 18–20% and 8–12%. No molybdenum, so no particular chloride resistance — PREN sits around 19.
On tube the low carbon matters because the assembly is welded. Orbital welds on hygienic runs, tube-to-tubesheet joints, field terminations on instrument lines: each one takes the heat affected zone through the sensitisation band, and in 304 that leaves a chromium-depleted strip along the weld. 304L does not form the carbides in the first place.
A213 and A269 annealed minima are 485 MPa (70 ksi) tensile, 170 MPa (25 ksi) yield and 35% elongation, hardness to HRB 92.
Two ceilings worth knowing. Chlorides: if the line carries brine, chlorinated water or sits in coastal air, 304L will pit and 316L is the grade. And temperature: above roughly 425 °C in sustained service the low carbon costs creep strength, and 321 or 347H take over. Inside those two limits 304L is the most economical welded tube on the list.
| Property | 304 | 304L | What it decides |
|---|---|---|---|
| Carbon, max | 0.08% | 0.030% | Whether a weld sensitises the heat affected zone |
| Chromium | 18–20% | 18–20% | Unchanged |
| Nickel | 8–10.5% | 8–12% | Marginally wider band on 304L |
| Molybdenum | none | none | Neither grade resists chlorides; that is 316 territory |
| Tensile, min | 515 MPa (75 ksi) | 485 MPa (70 ksi) | Wall thickness where allowable stress governs |
| Yield, min | 205 MPa (30 ksi) | 170 MPa (25 ksi) | As above |
| Sustained service | to approx. 425 °C | lower, creep limited | Above that, 321 or 347H |
| Post-weld anneal | Often required | Not required | Fabrication cost and schedule |
On tube the carbon ceiling earns its keep more often than on pipe, because tube assemblies are welded constantly: orbital welds on hygienic runs, tube-to-tubesheet joints, field terminations on instrument lines. Each one takes the heat affected zone through the 425–815 °C band.
SS 304L tube supplied by Siddhgiri Overseas is manufactured to the chemical and mechanical limits set out in ASTM A213, ASTM A249 and ASTM A269 (and the corresponding ASME SA specifications), summarised below.
|
Chromium |
18.0% – 20.0% |
|
Nickel |
8.0% – 12.0% |
|
Carbon |
0.035% max (low-carbon grade, held near 0.03% in production) |
|
Manganese |
2.0% max |
|
Tensile Strength |
485 MPa min (70 ksi) |
|
Yield Strength |
170 MPa min (25 ksi) |
|
Hardness |
Rockwell B (HRB) 92 max, or Brinell (HBW) 201 max |
|
Applicable Standards |
ASTM A213, ASTM A249, ASTM A269, ASME SA213, ASME SA249 |
|
Dimensional Standards |
ANSI B36.19M, ANSI B36.10M |
The lower carbon ceiling of 304L comes with a modest mechanical trade-off compared to standard 304, which carries slightly higher yield and tensile minimums. Where a project needs both the higher strength rating of 304 and the welding advantages of 304L, dual-certified 304/304L tube — manufactured to satisfy both specifications simultaneously — is available. Every heat is traceable to its original melt, and mill test certificates are provided with each dispatch.
SS 304L tube is supplied by Siddhgiri Overseas in both seamless and welded construction, selected according to the project's pressure rating, fluid handling requirements and budget.
Seamless (SMLS): Produced without a longitudinal weld seam by piercing a solid billet over a mandrel, then hot extruding or cold drawing to final size. Seamless construction is specified for high-pressure and high-temperature duty and for installations where a weld joint would be a potential point of failure.
Electric Resistance Welded (ERW): Formed by cold-rolling strip into a cylindrical shape and joining the seam using high-frequency electric resistance welding. This is an economical construction method that holds close dimensional tolerances.
Electric Fusion Welded (EFW): Used for heavier-wall tube, formed from rolled plate joined with a high-energy electric arc for deep weld penetration, typically verified by continuous radiographic testing.
Cold Drawn Welded (CDW): A welded tube that is subsequently cold-drawn through precision dies over an internal mandrel, which refines grain alignment at the weld seam and reduces eccentricity and surface roughness.
Available end configurations include plain end, beveled end and threaded ends, in single random, double random or cut-to-length profiles, with surface finishes ranging from No.1 pickled and 2B matte through No.4 brushed to bright annealed (BA) and mirror-polished (No.8) options. Every batch is verified through dimensional inspection, hydrostatic testing, eddy current or ultrasonic testing, and chemical composition (PMI) verification before dispatch.
The combination of corrosion resistance and reliable weldability makes SS 304L tube suitable across a wide range of process and instrumentation duties:
Siddhgiri Overseas supplies SS 304L tube in the sizes, wall thicknesses and surface finishes needed across these applications, manufactured and tested at our Mumbai facility.
Siddhgiri Overseas is ISO certified for quality, occupational health & safety and environment management, and holds the import and export certification required to supply stainless steel pipe and tube to customers worldwide. Certificate copies are available on request for buyers who need them for their own compliance records.
Total material traceability: All production lots are tracked from the raw material melt furnace to dimensional testing, along with the EN 10204 Type 3.1 Mill Test Certificate.
Seamless and welded pipes : are available in a wide range of sizes and schedules and can be dispatched immediately.
Custom Fabrication Capabilities: Capable of meeting custom project requirements such as non-standard lengths, precise bevelling profiles and special finishes.
Global Logistics Infrastructure: Dependable shipping partnerships provide the security and efficiency of timely delivery to commercial yards and construction locations around the world.
Market-Aligned Pricing: Optimised supply chains enable the delivery of high-quality materials in compliance with international standards at highly competitive commercial pricing.
Talk to our Engineering Sales Division today and check your exact sized, technical and layout volumes. We have fast, market-competitive pricing, flexible logistics timelines and extended material documentation for your company's corporate procurement requirements. Call, send e-mail, or use our online inquiry system to get a quick response.
The "L" stands for Extra-Low Carbon, meaning the elemental carbon content of the alloy is strictly controlled to remain below 0.03%. In standard 304 stainless steel, exposure to high-temperature welding (425°C to 815°C) causes carbon to bond with chromium, forming chromium carbides along the grain boundaries. This causes localized chromium depletion and leaves the Heat-Affected Zone (HAZ) highly vulnerable to intergranular corrosion. The low-carbon chemistry of SS 304L completely disrupts this mechanism, preventing weld decay without the need for costly post-weld solution annealing.
SS 304L is engineered to sustain high structural integrity across high-stress environments. Its core mechanical metrics include:
Ultimate Tensile Strength: ≥ 485 MPa (70 ksi)
Yield Strength: ≥ 170 MPa (25 ksi)
Hardness Limits: Rockwell B (HRB) ≤ 92 Max or Brinell Hardness (HBW) ≤ 201 Max
Thermal Capability: Proven ability to perform reliably at elevated temperatures up to 525°C.
Depending on structural loads, fluid dynamics, and budgets, welded 304L tubing is offered in three primary types:
Electric Resistance Welded (ERW): Formed from a continuous sheet; represents a highly cost-effective option with very close dimensional tolerances.
Electric Fusion Welded (EFW): Manufactured using heavy plate rolling and high-energy electric arcs. It features deep weld penetration and is validated by 100% continuous radiography for thick-walled applications.
Cold Drawn Welded (CDW): Produced by pulling a welded base tube through a precision die and core mandrel. This aligns the grain structure with the seam, drastically reducing eccentricity and micro-inch surface roughness.
Safe operating pressures are governed by ASME B31.3 processing rules (calculated via Barlow’s formula). As operating temperatures rise, the alloy's mechanical strength undergoes thermal reduction, causing the maximum allowable internal working pressure to scale downward. For example, a 1/2-inch Schedule 40S seamless pipe drops from an ambient rating of 3,120 psig (at -20°F to 100°F) down to 2,150 psig under severe heat limits (750°F).
To ensure absolute material validation and readiness for field installation, supplier distribution centers utilize:
Advanced Testing: Hydrostatic, Eddy Current, Ultrasonic, Radiography (100% X-Ray), and Positive Material Identification (PMI) spectroscopy testing to guarantee total traceability to the original melt heat sequences.
Precision Pre-processing: High-capacity draw benches, heavy mandrel matrices, high-speed band saws, precision laser-cutting arrays, and pipe-bevelling machines to provide custom pre-configured pipes.
Inspection Coordination: Regular verification partnerships with trusted international inspection bodies such as Bureau Veritas, SGS, TUV, and Lloyd's Register.
To maintain straightness, exact weld prep angles, and flawless surface states over long distances, products are packed based on fragility:
Standard Piping: Secured in a hexagonal matrix using heavy steel bands, wrapped in high-density polyethylene (HDPE) plastic sheathing, and fitted with dedicated lifting straps to prevent metal-on-metal friction.
Exposed Ends: Guarded with heavy-gauge plastic caps to keep out debris and protect beveled edge profiles from impact.
Capillary, Instrument, & Electropolished (EP) Lines: Enclosed entirely within heavy-duty wooden crates utilizing shock-absorbing internal framing.
SS 304L is the low-carbon version of standard 18-8 austenitic stainless steel grade 304. The only significant compositional difference is carbon content — capped at 0.035% maximum for 304L against 0.08% maximum for standard 304 — which prevents chromium carbide formation during welding and gives 304L its resistance to weld decay.
During welding, the metal near the joint heats through the 425°C–815°C range, where carbon in standard 304 combines with chromium to form chromium carbides at the grain boundaries. This depletes chromium in the heat-affected zone and leaves it prone to intergranular corrosion. With carbon held below 0.035% in 304L, there is not enough carbon present for this reaction to significantly occur, so the heat-affected zone keeps its corrosion resistance without needing post-weld solution annealing.
Argon oxygen decarburisation (AOD) is a secondary steelmaking process used to reduce carbon content precisely while minimising chromium loss during melting. Siddhgiri Overseas uses AOD refining to achieve the tight carbon control that SS 304L requires, followed by solution annealing at 1040°C–1120°C and water quenching to set the final austenitic microstructure and mechanical properties.
Our SS 304L tube is manufactured to ASTM A213 (ferritic and austenitic alloy steel tubes for boilers and heat exchangers), ASTM A249 (welded austenitic tube) and ASTM A269 (general-service austenitic tube), along with the corresponding ASME SA specifications and dimensional standards such as ANSI B36.19M.
Yes. Siddhgiri Overseas supplies SS 304L tube as seamless (SMLS), Electric Resistance Welded (ERW), Electric Fusion Welded (EFW) and Cold Drawn Welded (CDW) construction. Seamless tube is chosen for high-pressure and high-temperature duty, while welded and cold-drawn-welded options offer a cost-effective alternative for lower-pressure applications.
We supply SS 304L tube in No.1 pickled, 2B matte, No.4 brushed, bright annealed (BA) and No.8 mirror-polished finishes, selected according to whether the application prioritises hygienic cleanability, corrosion resistance or appearance.
Every batch undergoes dimensional inspection, hydrostatic pressure testing, eddy current or ultrasonic testing, and chemical composition (PMI) verification, with mill test certificates provided to confirm traceability back to the original melt heat.
SS 304L tube is widely used in chemical process systems, food and dairy processing, pharmaceutical and high-purity systems, instrumentation and control lines, low-temperature and cryogenic service, and any application involving heavy field welding where avoiding post-weld heat treatment matters.
