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The difference between 304 and 304L stainless steel
Release Date:
2024-08-26
Author:
304 stainless steel is the most widely used grade of stainless steel. As a versatile material, it exhibits excellent corrosion resistance, heat resistance, low‑temperature strength, and mechanical properties. It also boasts superior hot‑working characteristics, such as excellent formability in processes like stamping and bending, and does not undergo quench hardening during heat treatment. Additionally, it is non‑magnetic and can be used over a temperature range from –196°C to 800°C.
1. What type of steel is stainless steel?
Stainless steel is a type of steel. Steel with a carbon content below 2% is classified as steel, while that above 2% is considered iron. During the smelting process, alloying elements such as chromium (Cr), nickel (Ni), manganese (Mn), silicon (Si), titanium (Ti), and molybdenum (Mo) are added to enhance the steel’s properties, imparting corrosion resistance—commonly referred to as rust resistance. This is what we call stainless steel.
What are “steel” and “iron”? What are their respective properties, and how are they related? What do the designations 304, 304L, 316, and 316L refer to, and how do they differ from one another?
Steel: A material whose primary constituent is iron, with a carbon content typically below 2% and containing other alloying elements. — GB/T 13304-91 “Classification of Steels”
Iron: a metallic element with atomic number 26. Iron materials exhibit strong ferromagnetism, as well as excellent ductility and heat resistance.
Stainless steel refers to steels that can resist weakly corrosive media such as air, steam, and water. Commonly used grades include 304, 304L, 316, and 316L, all of which belong to the 300 series of austenitic stainless steels.
-304 stainless steel-
Detailed Feature Description
304 stainless steel is the most widely used grade of stainless steel. As a versatile material, it exhibits excellent corrosion resistance, heat resistance, low‑temperature strength, and mechanical properties. It also boasts superior hot‑working characteristics, such as excellent formability in processes like stamping and bending, and does not undergo quench hardening upon heat treatment. Additionally, it is non‑magnetic and suitable for service temperatures ranging from –196°C to 800°C.
Application areas
Household goods (Classes 1 and 2: tableware, cabinets, indoor plumbing, electric water heaters, boilers, bathtubs)
Automotive components (windshield wipers, mufflers, molded products)
Medical devices, decorative building materials, chemical products, the food industry, agriculture, and shipbuilding components.
-304L stainless steel-
(L stands for low carbon)
Detailed Feature Description
As a low-carbon grade of 304 stainless steel, it exhibits corrosion resistance comparable to that of 304 steel under normal conditions; however, after welding or stress relief, its resistance to intergranular corrosion is particularly outstanding. Moreover, even without heat treatment, this material maintains stable corrosion resistance across a temperature range from –196°C to 800°C.
Application areas
It is suitable for outdoor mechanical equipment in industries such as chemical, coal, and petroleum, where high resistance to intergranular corrosion is required, as well as for heat‑resistant components of decorative building materials and for parts subjected to complex heat‑treatment processes.
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Let us introduce you to what aluminum tubing is.
Aluminum tubing typically refers to pipes made from aluminum alloys. Aluminum alloys are materials composed of aluminum combined with other metallic elements, characterized by their light weight, high strength, and excellent corrosion resistance, making them widely used across various industries.
Aluminum tubes are mainly classified into the following types.
Classified by precision: ordinary aluminum tubes and precision aluminum tubes; the latter typically undergo secondary processes such as cold drawing and rolling after extrusion.
With the rapid growth of the new‑energy vehicle industry, automotive thermal management systems are confronting entirely new challenges and opportunities. In this field, aluminum tubing, thanks to its superior performance and broad range of applications, has steadily emerged as an unsung leader in thermal management for new‑energy vehicles, providing robust support for enhanced vehicle performance and safe operation.
Production and Manufacturing of Aluminum Tubes
Aluminum tubes are classified into four main types based on their forming process: hot-extruded aluminum tubes (the mainstream), cold-drawn and precision-rolled aluminum tubes, welded aluminum tubes, and impact-extruded pharmaceutical aluminum tubes. Among these, the most widely used in the industry is seamless or split‑die extruded aluminum tubing.
What is the difference between 409 stainless steel and 430 stainless steel?
Compared with ordinary low‑carbon steel, 409 stainless steel sheet exhibits poorer thermal conductivity and lower elongation; consequently, greater deformation forces are required during shearing and bending. For 321 stainless steel sheet, springback during bending is more pronounced than in carbon steel. Moreover, since the elongation of stainless steel sheet is lower than that of carbon steel, the bend radius R of the workpiece should be larger than that for carbon steel during bending operations; otherwise, cracking is likely to occur.
What is the difference between 202 stainless steel and 304 stainless steel?
202 stainless steel and 304 stainless steel are both austenitic stainless steels at their core, non-magnetic, and visually quite similar. However, the key difference lies in their nickel content, which results in significant variations in their mechanical properties and price.
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