Stainless Steel 304L

Stainless Steel 304L is a widely used stainless steel alloy known for its corrosion resistance, formability, and weldability.

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Stainless steel 304L CNC machined housing part with passivated finish

1.4307
X2CrNi18-9
S30403

485-600 MPa

Ultimate Tensile Strength
170-310 MPa

Yield Strength
191 GPa

Young's Modulus(Elasticity)
35 %

Elongation at Break

At a Glance

Material Type
Metal
Material Name
Stainless Steel 304L
Alternative Names
1.4307 | X2CrNi18-9 | S30403
Process Compatibility
CNC Milling, CNC Turning

Properties Table of Stainless Steel 304L

Properties

Ultimate Tensile Strength 485-600 MPa
Yield Strength 170-310 MPa
Young's Modulus(Elasticity) 191 GPa
Elongation at Break 35 %(min)
Physical Properties
Corrosion Resistance Good
Magnetism No
UV Resistance Excellent
Weldability Excellent
Thermal Properties
Maximum Service Temperature 750-925 °C
Thermal Expansion Coefficient 16.5 x 10^-6/°C
Thermal Conductivity 16.2 W/(m·°C)
Electrical Properties
Electrical Resistivity 70 μΩ*cm

Applications of Stainless Steel 304L

Kitchen Sinks
Pipe and Tubing for Water Treatment
Surgical Instruments
Aerospace Exhaust Systems
Pharmaceutical Equipment
Automotive Trim
Food Processing Equipment
Textile Machinery Components

Advantages of Stainless Steel 304L

Excellent corrosion resistance
Low carbon content reduces the risk of intergranular corrosion during welding
Easy weldability
Retains strength and corrosion resistance at high temperatures
Smooth surface for easy cleaning, resistant to bacterial and fungal growth
High durability, long lifespan
Visually appealing, shiny finish for aesthetic appeal

Raw Stock

CNC Machined

Finished Parts

Stainless Steel 304L — Machining Notes

Stainless Steel 304L in
is Stainless Steel 304L?

Stainless Steel 304L in CNC Machining

Stainless Steel 304L is a widely used stainless steel alloy known for its corrosion resistance, formability, and weldability.

Choosing sharp carbide tools, preferably coated for extended tool life, is important when machining this material using CNC processes. Adjust cutting speeds and feeds accordingly, considering the workpiece complexity and CNC machine capabilities. Using a water-based coolant helps dissipate heat, preventing work hardening. Secure workpieces well to minimize vibrations and ensure effective chip control to prevent tool wear. Post-machining processes like deburring may be necessary, and achieving a desired surface finish may require specific tooling and parameters. Regularly monitor tool wear and maintain a clean machining environment to avoid contamination.

Stainless Steel 304 and Stainless Steel 304L are closely related alloys with similar corrosion resistance and mechanical properties. The key difference lies in their carbon content, where 304 has about 0.08% carbon and 304L (the “L” denotes low carbon) has a maximum of 0.03%. This small difference makes Stainless Steel 304L more resistant to sensitization and intergranular corrosion after welding. That’s why 304L is preferred in applications involving extensive welding, such as fabricating pressure vessels, where corrosion resistance post-welding is important. Plus, 304L may be more suitable in regions where it is readily available and cost-effective.

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What is Stainless Steel 304L?

Stainless Steel 304L is an austenitic stainless steel known for its corrosion resistance and versatility. It belongs to the 300 series and has a lower carbon content than standard 304 stainless steel. The reduced carbon content helps prevent carbide precipitation during welding, enhancing corrosion resistance.

This steel is widely used in the food and beverage industry, chemical processing, and pharmaceuticals. Its ease of fabrication and formability make it a popular choice for manufacturing pipes, tanks, and heat exchangers.

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FAQ

What does the L stand for in 304L stainless steel?

The "L" in 304L stainless steel stands for "Low Carbon." It indicates that the steel has a lower carbon content than standard 304 stainless steel. The reduced carbon content helps minimize carbide precipitation during welding.

Why is 304L better than 304?

304L stainless steel is considered better than 304 in certain applications. Its lower carbon content helps prevent sensitization and intergranular corrosion that can occur in the heat-affected zones of welds in standard 304 stainless steel. This makes 304L more suitable for welding applications.

Is 304L stainless steel waterproof?

Stainless steel, including 304L, is highly resistant to corrosion and rust but is not completely immune to water-related issues. While it is inaccurate to say that stainless steel is "waterproof," it is highly water-resistant.

Which is better 304L or 316?

Both are austenitic stainless steels with similar properties, but 316 contains molybdenum, which enhances corrosion resistance, especially in chloride environments. If the application involves exposure to harsh chemicals or saltwater, 316 stainless steel may be better. However, 304L is often preferred in less corrosive environments because it is cheaper.