Touch the bottom of the sink and select the top se

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Touch the bottom of the sink and select the top secret information of the stainless steel sink. Exclusive disclosure

purchase tips: how to select the stainless steel sink

I. Basic knowledge of stainless steel: stainless steel is mainly composed of low-carbon alloy steel containing nickel and chromium, which is divided into nickel series stainless steel and chromium series stainless steel according to the proportion of nickel and chromium. Stainless steel is divided into austenite, martensite, ferrite and precipitation hardening stainless steel according to its structure. The chromium content of high-quality stainless steel materials on the market should not be less than 18%, and the nickel content should not be less than 10%. At present, stainless steel hot rolled thick plates are used for stainless steel sinks (thin plates with a thickness of less than 3mm and thick plates with a thickness of more than 3mm)

II. Production process

1. Raw materials: at present, the common raw materials of domestic stainless steel sink manufacturers are 0.8? 1.0mm thick plate, the common model is Japan (JIS) SUS304, corresponding to China (GB) 0Cr18Ni9 (0Cr19Ni9). Too thin plate affects the service life and strength of the sink, and too thick plate is easy to damage the washed tableware

2. Process: there are two processes for the production of stainless steel sink. The first is the welding method. The groove surface and groove body are stamped respectively, and the two are connected by welding method. The weld surface is filled and polished. Generally, there is no welding trace in the front appearance. This production method is simple, small stamping equipment and simple mold can be used, generally 0.5? About 0.7mm stainless steel plate, with less loss in the production process and relatively low cost. The other is the one-time forming method. The water tank is pressed with a whole piece of plate, which has high requirements for processing equipment and molds. Because one-time forming has high requirements for the quality and ductility of the plate, it generally uses 0.8-1mm thick plate stamping, using integral molds and imported stamping equipment. Due to the large cutting loss of plate edges in the production of one-time forming method, coupled with the investment of molds and equipment, the cost is high

3. Surface treatment the surface treatment of the water tank is mainly matte, including wiredrawing, sanding, etc., so that even if it is old, the scratches on it cannot be seen

as an ordinary consumer, how to distinguish stainless steel sinks? Of course, price is the main reference factor, but it is not entirely true. Now there are too many things with inferior quality and high price. In the face of stainless steel sinks with more than 1000 yuan, as consumers, they often have no choice but to follow the trend with the big slip or be misled by JS. Here are some ways to choose stainless steel sinks based on personal experience

1. Specific thickness: as mentioned above, good stainless steel sinks use relatively thick plates. Because the sink has been edge treated, it is difficult to see the thickness at once. The simplest way is to press the surface of the sink with a little force. If it can be pressed down, it means that the material is very thin (hehe, this is how to check the thickness of the steel plate when buying a car on the Internet), Of course, if you can borrow vernier caliper and screw micrometer, don't be so troublesome

2. Weight: stainless steel is a kind of ferroalloy, and the specific gravity of steel is 7.87. Nickel and chromium heavy metals are added in it. The specific gravity of these metals is larger than that of steel, so the weight is relatively heavy (of course, refer to the thickness of the plate). If it is fake, low-quality stainless steel, such as chrome plating of steel plate, the weight is light

3. See the process: there are welding method and integrated molding method. We see some famous brand sinks with the same appearance and size, but the prices vary greatly. There are both material factors and process costs. Of course, it can be said for sure that the materials of stainless steel water tanks with one-piece forming method are better than those with welding method. First class water tanks are generally produced by one-time stamping method. Of course, there are also low-end products in famous brands. There are many welding methods. You can touch them with your hand. Please see the illustration:

4. Scratch the surface: now JS is horizontal and full of traps. Some stainless steel is actually a layer of steel plate plated with a layer of chromium, and the price is not necessarily cheap. This is a bad trick, which should be used under the condition of ensuring safety. If we like a sink, but have doubts about its material, we can take advantage of the time when there are many people in the store, lift the sink sample from the counter, and use the key to scratch the bottom (pay attention not to scratch the surface of the sink, if you want to be beaten, don't scratch the coating and sound insulation pad at the bottom, it's useless), and then go again every 1-2 weeks to see the situation of the scratched part of the sink, If there is no rust trace, the material is OK

this trick must be used with caution. In case of adverse consequences, you should bear your own responsibility

picture description of welding method and integral molding method

2 sinks first look at your face and think about question 1. Guess which size is expensive and which weight is heavy

take another look at their buttocks

integrated molding details zoom in

close up of buttocks details of welding method

stainless steel sinks sold in the decoration market, including some well-known brands, are of questionable production sources. According to a friend who is engaged in hardware, flumes with this welding method can generally be produced in family workshops. As long as there are two small punches and the weld edges are filled and polished, it is difficult for ordinary consumers to find them. Now JS never mentions this process problem when selling. It tells you bullshit all day long that using imported stainless steel plates makes the price high and the surface treated well. The surface treatment process is very simple and does not cost much. It is nothing more than roughening the originally high gloss stainless steel surface and making it into frosted or brushed. Physical principle: mirror reflection is changed into diffuse reflection to cover up scratches (because there must be scratches after use), and the cost of this process is quite low

if you look carefully again?? You will find!!!! There is also a great difference in edge treatment between welding method and integrated forming method

the steel plate must be one-piece thick

welding method: the stainless steel plate is thin, and the corner can be bent to make a big surrounding. (left in the figure below)

one piece method: the steel plate is thick and cannot be bent, so only one more piece can be welded as a fixing strip for installing the hook to fix the sink on the table. (right in the figure below)

>& gt;& gt; Stainless steel sink classification and purchase guide

1: chromium content should not be less than 18%, nickel content should not be less than 10%, that is, 18/10 stainless steel, has reached the level of medical and edible, and the price is relatively high; Generally, many of the stainless steel products we see are 18/8 stainless steel (the chromium content should not be less than 18%, and the nickel content should not be less than 8%), and most of them cannot reach 18/8, but we cannot test this by conventional means

2. One time molding must be good First of all, its steel plate is better. The technical term is "good deep punching resistance", which means that it has good deep punching ability and good toughness. This requires that there is enough nickel in the components, that is, at least 18/8 of the steel plate can be punched out. Even so, the edge of its corner should also be thinner, that is, the part connecting the table top and the basin, because the section angle of this part is relatively the smallest part

3. Please don't ignore the silencing layer at the bottom. Knock, listen, and you will understand the difference. Imagine that you want to eat an apple at night, wash it with water, and water flows to the bottom of the bucket. The bucket in the kitchen is like a drum. What's the feeling

4. Falling components are also important




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