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A Simple Classification of Stainless Steel
Release Date:
2024-05-27
Author:
Stainless steel is a high-alloy steel that resists corrosion, with a smooth, aesthetically pleasing surface that requires no additional surface treatments such as plating or painting. Consequently, many machinery manufacturers often leave it in its natural finish to highlight the material’s stainless‑steel qualities, whereas black‑colored materials—commonly referred to as ordinary steels—must undergo anti‑corrosion treatment. Among these, stainless steel enjoys the broadest range of applications.
1. Definition of Stainless Steel
Stainless steel is a high-alloy steel that resists corrosion, featuring a smooth, aesthetically pleasing surface that requires no plating, painting, or other surface treatments. Consequently, many machinery manufacturers often forgo additional coatings to highlight the material’s inherent stainless‑steel qualities, whereas black‑colored materials—commonly referred to as ordinary carbon steel—must undergo anti‑corrosion treatment. Among these, stainless steel enjoys the broadest range of applications.
2. Simple Classification of Stainless Steel
Stainless steel can be broadly classified into three main series: the 200 series, the 300 series, and the 400 series.
Among these, the 300 series is the most widely used. The 200 and 400 series can, to some extent, serve as substitutes for the 300 series. Strictly speaking, the 400 series is not stainless steel but rather acid-resistant steel. Because it contains no nickel, it is attracted by a magnet.
The 200 and 300 series are made of nickel, so they are non-magnetic and will not be attracted to iron.
304 is the most common grade in the 300 series, so the overall price trend of stainless steel can typically be gauged by tracking changes in 304 prices.
The 200 series has a lower nickel content, the 400 series contains no nickel, and the 300 series has the highest nickel content; consequently, the 300 series is most susceptible to fluctuations in nickel prices.
The 300 series can be broadly categorized into grades such as 304, 304L, 316, 316L, 321, 309S, and 310S. These grades are distinguished by their varying alloying element contents. Stainless steels with different compositions also exhibit distinct properties, primarily reflecting differences in carbon (C) content. In this context, the designation “L” indicates low carbon content; it is also referred to as “low‑carbon steel,” and the two terms carry the same meaning.
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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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