Introduction to 304 Stainless Steel
304 stainless steel is a common stainless steel, also known in the industry as 18/8 stainless steel. Its corrosion resistance is better than 430 stainless steel, but the price is cheaper than 316 stainless steel, so it is widely used
In life, for example: some high-end stainless steel tableware, outdoor railings, etc. Although this kind of stainless steel is very common in China, the name "304 stainless steel" comes from the United States. Many people think that 304 stainless steel is a model name in Japan, but strictly speaking,
Japan's official name for 304 stainless steel is "SUS304" 304 is a versatile stainless steel, which is widely used in the production of equipment and parts that require good comprehensive performance (corrosion resistance and formability). In order to maintain the inherent properties of stainless steel Corrosion resistance, steel must contain more than 12% chromium. 304 stainless steel is a grade of stainless steel produced according to the American ASTM standard. 304 is equivalent to my country's 0Cr19Ni9 (0Cr18Ni9) [according to GB/T 20878-2007 has been changed to 06Cr19Ni10 ]Stainless steel.
304 stainless steel round tubes are used in towel racks, bathroom products, mechanical components, hardware and other parts; in order to meet processing requirements such as flaring and bending, many steel tubes need to be heat treated to soften the structure and improve their plasticity. However, as its hardness decreases, the wear resistance also decreases; and the 304 material is also prone to rust in some environments. In order to solve this problem, chrome plating can generally be used. Is 304 stainless steel round tube chrome-plated? Let's introduce it in detail:
Before chrome plating of stainless steel, the method of activation-pre-nickel plating can be used to obtain the bottom layer, and then chrome plating on the nickel layer can obtain a chromium layer with good adhesion. Chrome plating is also divided into protective chrome, wear-resistant chrome and milky white chrome layer.
The benefits of chrome plating for 304 round tubes
1. Protective chromium
Also commonly known as decorative chromium, the coating is thin, bright and beautiful, and improves the appearance; it is usually used as the outermost layer of multi-layer electroplating. Plated with a thin layer of chromium of 0.25-0.5 μm.
After the surface of the polished 304 stainless steel round tube is plated with protective chrome, it can obtain a silver-blue mirror luster. Products that will change color in the atmosphere and are prone to rust in humid environments are coated with a layer of chromium, which can isolate air oxidation and directly play a role in corrosion protection.
2. Wear-resistant chrome
The chromium plating layer has a high hardness, and its hardness can vary within a wide range of 400-1200HV according to the composition of the plating solution and the process conditions. The chromium plating layer has good heat resistance. When heated below 500°C, its gloss and hardness will not change significantly. When the temperature is higher than 500°C, it will start to oxidize and change color, and the hardness will begin to decrease when the temperature is higher than 700°C.
The friction coefficient of the low chromium plating layer is small, especially the dry friction coefficient, which is the lowest among all metals, so the chrome plating layer has good wear resistance. Especially the austenitic stainless steel 304 round tube has low hardness. Although it has good corrosion resistance, it is not wear-resistant. Therefore, hard chrome plating is required to increase hardness, increase wear resistance and prolong service life.
3. Wear-resistant chrome
Milky white, low gloss, good toughness, low porosity, soft color, lower hardness than wear-resistant chromium and protective chromium, but high corrosion resistance. In order to improve its hardness, a layer of wear-resistant chrome can be plated on the surface of the milky white coating, which is the so-called double-layer chrome coating, which has the characteristics of both milky white chrome coating and wear-resistant chrome coating. It is mostly used in industries that require both corrosion resistance and wear resistance.
Is 304 stainless steel round tube chrome-plated? Of course! Like the more common protective chromium layer, it has a silver-blue mirror luster and improves its oxidation resistance; the wear-resistant chromium layer can improve the hardness of the surface of 304 stainless steel round tubes, reduce the friction coefficient, improve its wear resistance, and prolong the product life; Milky white The chrome layer has the strongest corrosion resistance, good toughness, low porosity, and soft color.
304 Stainless Steel Plate wholesalers
Shangyi International Trade Co., Ltd. is a company specializing in the production of stainless steel products. The 304 stainless steel plate produced by our company has excellent performance and is well recognized by the market. If you have this need, please contact us.
