Stainless Steel

Stainless Steel 304L Pipe & Tube

Low-Carbon Austenitic Stainless Steel Seamless, Welded, ERW & Sanitary Tubes for Chemical & Process Industries

Grade SS 304L / TP304L (UNS S30403, Werkstoff 1.4306 / 1.4307, X2CrNi19-11, SUS 304L, 304S11)
Standard ASTM A312, ASME SA312, ASTM A213, ASME SA213, ASTM A269, ASTM A249, ASTM A358, ASTM A554, ASME B36.19M, ASME B36.10M, EN 10216-5, DIN 17456 / 17458
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Product Overview

Om Export India Pvt Ltd is a premier manufacturer, stockist, and global exporter of high-grade Stainless Steel 304L Pipes and Tubes (ASTM A312 TP304L / UNS S30403 / DIN 1.4306 / DIN 1.4307). Grade 304L is an extra-low-carbon modification of the standard 18-8 austenitic stainless steel grade (maximum 0.030% Carbon). This controlled low-carbon chemistry prevents harmful chromium carbide precipitation at grain boundaries during welding, providing complete immunity to intergranular corrosion and eliminating the need for post-weld solution annealing in heavy-wall piping installations.

Our comprehensive production range covers cold-drawn seamless pipes, high-frequency induction ERW tubes, automated TIG/plasma welded piping, and sanitary dairy tubing manufactured strictly to ASTM A312, ASTM A269, and ASME Section II standards. Operating with a density of 8.00 g/cm³, our SS 304L piping solutions exhibit exceptional cold formability, high cryogenic toughness down to -196°C, and structural scaling resistance up to 525°C (977°F). These pipes and tubes serve critical fluid and gas transmission systems across chemical refineries, food and dairy processing, petrochemical piping, and architectural structural engineering.

  • Intergranular Corrosion Immunity: Low carbon content (≤ 0.030% C) prevents carbide sensitization in the heat-affected zone (HAZ) during welding operations.
  • Severe Pressure & Cryogenic Integrity: Retains high impact toughness and mechanical ductility from cryogenic conditions (-196°C) up to elevated process temperatures.
  • Surface Cleanliness & Finishes: Available in bright annealed (BA), pickled & passivated (AP), 2B mill finish, and mechanical mirror polish (up to 600 Grit / No. 8) with laser PE/PVC protection.

Key Features

  • Low-Carbon Sensitization Resistance: Eliminates weld decay and intergranular stress corrosion cracking without post-weld heat treatment.
  • High Cryogenic Toughness: Retains non-magnetic, fully austenitic ductility and high Charpy impact strength down to -196°C (-320°F).
  • Formability & Workability: High elongation (≥40%) permits tight flanging, expanding, cold drawing, and coiling operations.
  • Atmospheric & Chemical Resistance: Chromium oxide passivation layer protects against oxidizing acids, potable water, and rural/urban environments.
  • Wide Structural & Dimensional Range: Available in round, square, rectangular, oval, and slotted profiles with strict outer diameter tolerances.
  • Welding Reliability: Readily weldable using TIG, MIG, and submerged arc welding with matching AWS ER308L filler wire.

Product Specifications

Specification Parameter Standard Specification / Technical Value
Nominal Size Range (Seamless) 1/8" NB to 24" NB (Outer Diameter: 6.00 mm to 609.6 mm OD)
Nominal Size Range (Welded / ERW / EFW) 1/8" NB to 48" NB (Outer Diameter: 6.00 mm to 1219.2 mm OD)
Wall Thickness & Schedules 0.30 mm to 50.0 mm (SCH 5S, SCH 10S, SCH 40S/STD, SCH 80S/XS, SCH 160, SCH XXS)
Governing Standards ASTM A312 / ASME SA312, ASTM A213, ASTM A269, ASTM A249, ASTM A358, ASTM A554
Manufacturing Methods Cold Drawn Seamless (CDS), Cold Rolled, High-Frequency Induction ERW, Automated TIG/Plasma Welded
Heat Treatment & Delivery State Solution Annealed at 1040°C – 1100°C followed by rapid water quench; Bright Annealed (BA)
Standard Lengths Single Random Length (SRL 5–7m), Double Random (DRL 10–12m), Custom Cut Lengths up to 18,000 mm
End Configurations & Protection Plain Square Cut (PE), Beveled End (BE 30°/37.5° per ASME B16.25), Threaded Ends with Plastic End Caps

Dimensions & Sizes

Nominal Pipe Size (NPS) Outside Diameter (OD mm / in.) Wall Thickness (WT mm / in.) Nominal Schedule Nominal Weight (kg/m) Nominal Weight (lb/ft)
1/2" NB 21.34 mm (0.840") 1.65 mm (0.065") SCH 10S 0.81 kg/m 0.54 lb/ft
1/2" NB 21.34 mm (0.840") 2.77 mm (0.109") SCH 40S / STD 1.29 kg/m 0.85 lb/ft
1/2" NB 21.34 mm (0.840") 3.73 mm (0.147") SCH 80S / XS 1.65 kg/m 1.09 lb/ft
3/4" NB 26.67 mm (1.050") 1.65 mm (0.065") SCH 10S 1.03 kg/m 0.69 lb/ft
3/4" NB 26.67 mm (1.050") 2.87 mm (0.113") SCH 40S / STD 1.71 kg/m 1.13 lb/ft
3/4" NB 26.67 mm (1.050") 3.91 mm (0.154") SCH 80S / XS 2.23 kg/m 1.48 lb/ft
1" NB 33.40 mm (1.315") 1.65 mm (0.065") SCH 5S 1.31 kg/m 0.88 lb/ft
1" NB 33.40 mm (1.315") 2.77 mm (0.109") SCH 10S 2.13 kg/m 1.43 lb/ft
1" NB 33.40 mm (1.315") 3.38 mm (0.133") SCH 40S / STD 2.54 kg/m 1.68 lb/ft
1" NB 33.40 mm (1.315") 4.55 mm (0.179") SCH 80S / XS 3.29 kg/m 2.17 lb/ft
1-1/4" NB 42.16 mm (1.660") 2.77 mm (0.109") SCH 10S 2.73 kg/m 1.83 lb/ft
1-1/4" NB 42.16 mm (1.660") 3.56 mm (0.140") SCH 40S / STD 3.44 kg/m 2.31 lb/ft
1-1/2" NB 48.26 mm (1.900") 2.77 mm (0.109") SCH 10S 3.16 kg/m 2.12 lb/ft
1-1/2" NB 48.26 mm (1.900") 3.68 mm (0.145") SCH 40S / STD 4.11 kg/m 2.72 lb/ft
1-1/2" NB 48.26 mm (1.900") 5.08 mm (0.200") SCH 80S / XS 5.49 kg/m 3.63 lb/ft
2" NB 60.33 mm (2.375") 2.77 mm (0.109") SCH 10S 3.99 kg/m 2.64 lb/ft
2" NB 60.33 mm (2.375") 3.91 mm (0.154") SCH 40S / STD 5.52 kg/m 3.66 lb/ft
2" NB 60.33 mm (2.375") 5.54 mm (0.218") SCH 80S / XS 7.60 kg/m 5.03 lb/ft
2-1/2" NB 73.03 mm (2.875") 3.05 mm (0.120") SCH 10S 5.35 kg/m 3.59 lb/ft
2-1/2" NB 73.03 mm (2.875") 5.16 mm (0.203") SCH 40S / STD 8.77 kg/m 5.89 lb/ft
3" NB 88.90 mm (3.500") 3.05 mm (0.120") SCH 10S 6.56 kg/m 4.34 lb/ft
3" NB 88.90 mm (3.500") 5.49 mm (0.216") SCH 40S / STD 11.47 kg/m 7.58 lb/ft
3" NB 88.90 mm (3.500") 7.62 mm (0.300") SCH 80S / XS 15.51 kg/m 10.26 lb/ft
4" NB 114.30 mm (4.500") 3.05 mm (0.120") SCH 10S 8.50 kg/m 5.62 lb/ft
4" NB 114.30 mm (4.500") 6.02 mm (0.237") SCH 40S / STD 16.32 kg/m 10.80 lb/ft
4" NB 114.30 mm (4.500") 8.56 mm (0.337") SCH 80S / XS 22.67 kg/m 15.00 lb/ft
6" NB 168.28 mm (6.625") 3.40 mm (0.134") SCH 10S 14.04 kg/m 9.30 lb/ft
6" NB 168.28 mm (6.625") 7.11 mm (0.280") SCH 40S / STD 28.69 kg/m 18.99 lb/ft
6" NB 168.28 mm (6.625") 10.97 mm (0.432") SCH 80S / XS 43.21 kg/m 28.60 lb/ft
8" NB 219.08 mm (8.625") 3.76 mm (0.148") SCH 10S 20.27 kg/m 13.62 lb/ft
8" NB 219.08 mm (8.625") 8.18 mm (0.322") SCH 40S / STD 43.20 kg/m 28.55 lb/ft
8" NB 219.08 mm (8.625") 12.70 mm (0.500") SCH 80S / XS 65.63 kg/m 43.39 lb/ft

Chemical Composition

Element ASTM A312 TP304L (%) UNS S30403 (%) DIN 1.4306 / 1.4307 (%)
Carbon (C, Max) 0.030 0.030 0.030
Chromium (Cr) 18.00 – 20.00 18.00 – 20.00 17.50 – 19.50
Nickel (Ni) 8.00 – 12.00 8.00 – 12.00 8.00 – 12.00 (10.0–12.5 for 1.4306)
Manganese (Mn, Max) 2.00 2.00 2.00
Silicon (Si, Max) 1.00 (0.75 Max) 0.75 1.00
Phosphorus (P, Max) 0.045 0.045 0.045
Sulfur (S, Max) 0.030 0.030 0.015
Nitrogen (N, Max) 0.10 0.10 0.10
Iron (Fe) Balance Balance Balance

Mechanical Properties

Mechanical Property ASTM A312 TP304L Specified Limits Typical Production Values
Tensile Strength, Ultimate (Min) 485 MPa (70 ksi / 70,000 psi) 520 – 580 MPa
Yield Strength (0.2% Offset, Min) 170 MPa (25 ksi / 25,000 psi) 210 – 260 MPa
Elongation in 2 in. / 50 mm (Min) 35% – 40% Min 45% – 55%
Hardness (Rockwell B / Brinell, Max) 92 HRB Max / 201 HBW Max 78 – 85 HRB (140 – 170 HBW)
Density & Modulus of Elasticity Density: 8.00 g/cm³ (8000 kg/m³) Modulus of Elasticity: 193 GPa (28 x 10⁶ psi)
Thermal Expansion (0–100°C / 0–538°C) 17.2 µm/m·°C (0–100°C) 18.4 µm/m·°C (0–538°C)
Thermal Conductivity & Resistivity 16.2 W/m·K at 100°C Electrical Resistivity: 720 nΩ·m

Standards & Specifications

Standard Designation Governing Organization Scope & Product Type
ASTM A312 / ASME SA312 ASTM / ASME Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes (TP304L)
ASTM A213 / ASME SA213 ASTM / ASME Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes
ASTM A269 / ASME SA269 ASTM / ASME Seamless and Welded Austenitic Stainless Steel Tubing for General Service
ASTM A249 / ASME SA249 ASTM / ASME Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes
ASTM A554 ASTM International Welded Stainless Steel Mechanical and Ornamental Tubing (Round, Square, Rectangular)
EN 10216-5 / DIN 17456 European / German Standards Seamless Steel Tubes for Pressure Purposes (Grade 1.4306 / 1.4307 / X2CrNi19-11)
ASME B36.19M / B36.10M ASME Standards Stainless Steel and Wrought Steel Dimensions, Wall Thicknesses, and Schedules
Indian Boiler Regulations (IBR) Central Boilers Board IBR Certified Steam and High-Pressure Stainless Steel Boiler Piping

Applications

Stainless Steel 304L pipes and tubes are utilized across global process industries, food and beverage facilities, and structural installations:

  • Food, Dairy & Beverage Processing: Sanitary fluid transfer, pasteurization loops, beer brewing lines, milk storage routing, and CIP (Clean-In-Place) piping.
  • Chemical & Petrochemical Plants: Transport of organic chemicals, mild inorganic acids, solvent recovery loops, and chemical storage manifold networks.
  • Pharmaceutical & Biotechnology: High-purity process piping, water for injection (WFI) loops, bioreactor vessels, and cleanroom process lines.
  • Water Treatment & Desalination: Municipal water filtration headers, potable water delivery pipelines, and reverse osmosis pre-treatment systems.
  • Architectural & Structural Projects: Ornamental square/rectangular handrails, balustrades, airport terminal canopies, and transport vehicle frames.
  • Cryogenic Engineering: Liquid nitrogen/oxygen transmission pipelines and liquefied gas storage equipment operating down to -196°C.

Frequently Asked Questions

Q1: What is the main metallurgical difference between SS 304 and SS 304L pipes?
The primary difference is carbon content: SS 304 has a maximum carbon limit of 0.08%, whereas SS 304L is restricted to a maximum of 0.030%. The lower carbon content in 304L prevents chromium carbide precipitation during welding, providing high resistance to intergranular corrosion in the as-welded condition without requiring post-weld annealing.

Q2: Can SS 304L pipes be used in high-pressure and high-temperature environments?
Yes, SS 304L is code-approved under ASME Section VIII and ASME B31.3 for pressure service. However, because its allowable design stress drops above 425°C (800°F) compared to standard 304 or 304H, design engineers typically utilize thicker pipe schedules (such as Schedule 40 or 80) for elevated pressure duties up to 525°C.

Q3: What surface finishes are available for SS 304L tubes?
We provide SS 304L in No. 1 (hot-rolled, annealed, and pickled), 2B (smooth cold-rolled), Bright Annealed (BA), mechanical grit polish (180, 240, 320, 400 Grit), and No. 8 Mirror Polish with protective laser peel-off PVC/PE films.

Q4: What non-destructive tests (NDT) are performed on ASTM A312 TP304L pipes?
All pipes undergo 100% hydrostatic pressure testing or automated Eddy Current testing, along with optional Ultrasonic Testing (UT), intergranular corrosion testing per ASTM A262 Practice E, and 100% Positive Material Identification (PMI).

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