Comprehensive analysis of 304L stainless steel tube

1、 Core characteristics and compositional differences

304L stainless steel tube is a low-carbon derivative of 304 stainless steel (carbon content ≤ 0.03%), corresponding to the Chinese grade 022Cr19Ni10. Its main components include:

Chromium (Cr): 18% -20%, providing basic corrosion resistance;

Nickel (Ni): 8% -12%, enhances material toughness and high temperature resistance;

Low carbon design: reduces the risk of intergranular corrosion, especially suitable for scenarios that do not require heat treatment after welding.

Compared with ordinary 304 stainless steel, its intergranular corrosion resistance is better, but its strength is slightly lower (tensile strength ≥ 520 MPa, yield strength ≥ 205 MPa).

2、 Application Fields and Advantages

304L stainless steel tube, with its low-carbon characteristics, is widely used in the following scenarios:

Chemical and pharmaceutical equipment: such as heat exchangers, reaction vessel pipelines, suitable for corrosive media environments;

Food processing equipment: meets hygiene standards and is suitable for dairy and beverage production equipment;

Welded components: corrosion resistance can be maintained without heat treatment after welding, reducing processing costs;

Petroleum and energy industry: used for transporting pipelines and high-temperature resistant components.

3、 International standards and production processes

Execution standards:

China: GB/T 20878-2007 (Seamless Steel tube Standard);

United States: ASTM A276-2017 (S30403 grade);

Europe: EN 10216-2 7.

Process requirements: It is necessary to use internal welding bead leveling treatment to ensure smooth surface and stable mechanical properties.

4、 Key points for selection and identification

Component verification: Confirm material compliance by detecting Cr, Ni content, and carbon content (≤ 0.03%);

Surface treatment: Prioritize seamless or precision welded pipes to reduce potential defects;

5、 Maintenance and usage suggestions

Cleaning and maintenance: Regularly remove surface stains to avoid pitting corrosion caused by long-term contact with chloride ions;

Welding precautions: Use matching welding materials and control heat input to maintain corrosion resistance.