304L Stainless Steel Pipe is the low‑carbon variant of 304 stainless steel, with a maximum carbon content of 0.03%. This reduced carbon level significantly enhances resistance to intergranular corrosion after welding, making 304L ideal for applications involving heavy welding, pressure systems, and corrosive environments.
304L maintains nearly identical corrosion resistance and mechanical performance to 304, while offering superior weldability and reduced risk of carbide precipitation.
Key Advantages:
Low carbon content prevents carbide precipitation during welding
Excellent resistance to intergranular corrosion
Suitable for pressure vessels and welded piping systems
Good general corrosion resistance in many industrial environments
Available in seamless and welded forms with multiple finishes
🟧 Standards
ASTM A312 / A312M
ASTM A213
EN 10216‑5
JIS G3463
GB/T 14976
🟧 Grade
304L (UNS S30403)
🟧 Product Specifications & Available Sizes
Outer Diameter (OD)
Seamless: 6–530 mm
Welded: 12–630 mm
Wall Thickness (WT)
0.5–30 mm
Length
6 m / 12 m / custom cut‑to‑length
Type
Seamless (Cold Drawn / Hot Rolled)
Welded (ERW / TIG / Laser Welded)
Surface Finish Options
2B
BA
180 / 240 / 320 / 400 / 600 Grit Polish
8K Mirror
Pickled
🟧 Chemical Composition (ASTM A312 TP304L)
Element
Content (%)
C
≤ 0.03
Si
≤ 1.00
Mn
≤ 2.00
P
≤ 0.045
S
≤ 0.030
Cr
18.0–20.0
Ni
8.0–13.0
N
≤ 0.10
🟧 Mechanical Properties
Property
Requirement
Tensile Strength
≥ 485 MPa
Yield Strength
≥ 170 MPa
Elongation
≥ 40%
The strength of 304L is slightly lower than that of 304, but its superior weldability is the alloy’s key advantage.
🟧 Physical Properties
Property
Value
Density
7.93 g/cm³
Melting Point
1400–1450°C
Thermal Conductivity
16.2 W/m·K
Electrical Resistivity
0.72 μΩ·m
🟧 Manufacturing Processes
Hot Rolling
Cold Drawing
TIG Welding
Laser Welding
Annealing
Pickling
Polishing
Eddy Current Testing
Hydrostatic Testing
🟧 Primary Industry Usage
Welded pipelines and manifolds
Pressure vessels and storage tanks
Chemical and petrochemical equipment
Heat exchangers and condensers
Marine and offshore piping
Structural and architectural tubing
Pharmaceutical and sanitary process lines
🟧 Why Use 304L Stainless Steel Pipe
Low carbon content prevents intergranular corrosion after welding
Ideal for heavily welded structures and pressure systems
Maintains similar corrosion resistance to 304
Suitable where post‑weld heat treatment is not feasible
Widely accepted in international engineering specifications
🟧 Why Choose WelSteels
Stable supply of 304L seamless & welded pipes
Full MTC 3.1 and third‑party inspection available
Professional support for welding, material selection & project documentation
Reliable export packaging and container loading supervision
Competitive pricing and fast delivery for global customers
