Stainless steel screws and carbon steel screws choose industry solutions.

Stainless steel screws and carbon steel screws choose industry solutions.

Stainless steel can resist corrosion by air, water, acids, alkalis, salts, or other media. According to the different alloy compositions, respectively, focus on stainless steel and acid resistance. Some steel, although stainless, is not necessarily acid-resistant; acid-resistant steel is usually stainless. Used in the production of fasteners are mainly austenitic stainless steel; in people's daily lives, often referred to as stainless steel, it is also austenitic stainless steel.

Stainless steel screws products: hexagon socket head cap screws, hexagon socket head cap screws (cup head), hexagon socket set screws with concave end (concave end machine meter), hexagon socket set screws with flat end (flat end machine meter), hexagon socket set screws with tip end (tip machine meter), hexagon socket set screws with column end (column end machine meter), countersunk hexagon socket head cap screws (flat cup), hexagon socket head cap screws with half-round head (cup), cross recessed pan head machine screws, cross recessed countersunk head machine screws, cross recessed flat head machine screws, cross recessed pan head tapping screws, cross suspended countersunk head tapping screws, cross recessed flat head tapping screws, full-threaded screws (bars), hexagonal nuts, flange nuts, nylon nuts, cap nuts, butterfly nuts, flat washers, spring washers, serrated washers, cotter pins and so on.

The main uses are environmental protection equipment, medical equipment, communication equipment, power facilities, electronic products, food machinery, petrochemicals, ship assembly, pumps, valves, pipelines, building curtain walls, and open-air occasions.

In the selection of stainless steel screws is not clear exactly how to distinguish between stainless steel screws and iron screws, there are often some inexperienced buyers will be in the procurement of errors, so in the end in the procurement of how to go to distinguish it?

First of all, from the appearance of the identification of stainless steel screws:whether sufficiently flat and smooth, Wu burr, as well as whether the thickness of the plating layer is up to standard, are the primary reference data. Next, we can test the thickness of stainless steel screw plating through the market gauge: micrometer, vernier calipers, and so on. Like a magnetic method, the timing liquid flow method and microscope method are also prevalent for different types of stainless steel screws for detailed testing and identification.

In the identification of stainless steel screws in the method, the professionals for the plating adhesion strength will also be more tests. Standard methods are mainly by friction polishing, scratch method and file method test, after these three methods of test, there is no significant wear and tear, and the data are still controlled in the industry standard products, naturally qualified stainless steel screws. We also need to know some stainless steel screws corrosion resistance test methods, you can buy professional reagents, drops in the stainless steel screws, through whether there is a black or green situation to identify. If there is enough time, contact a third-party testing organization, and let them carry out professional salt spray tests (NSS tests), acid salt spray tests (ASS tests, and accelerated acetic acid salt spray tests (CASS tests) are fast and highly accurate practices.

Directly with a magnet, it can be well sucked up; it must be iron screws. It cannot be sucked up; it must be stainless steel screws. Screw head type selection generally takes into account the tamper-evident performance; it is likely to be used to hexagonal or other unique shapes, and some will also consider its appearance. If the requirements of the screw a stable and reliable, it is likely to choose more resistant to fall screws or is direct with the gasket screws, so we must select the screws in the selection of screws according to the use of the scene to choose the appropriate screw products.

Use scientific machines to test. For example, salt spray test, hardness test, spectrometer material analysis, acid resistance, etc., to distinguish stainless steel screws and iron screws.

Carbon steel screws and stainless steel screws from the performance to distinguish stainless steel screws' corrosion resistance, high-temperature resistance, and rust prevention. Carbon steel screws have these properties, and stainless steel screws than no way. Stainless steel does not rust; iron rust, in addition to stainless steel, has weaker thermal and electrical conductivity than carbon steel.

Currently on the market are 201 stainless steel, 202 stainless steel, 304 stainless steel, 316L stainless steel, and several other kinds of stainless steel, of which 316L is a high-grade stainless steel. Corrosion resistance is the strongest, but the cost is very high. And 201/202 stainless steel screws and 304 stainless steel screws can be distinguished from the surface gloss, product hardness, salinity resistance, and so on. Several aspects of the general production of regular manufacturers of products in the packaging are marked.

Recommend the following low-cost and relatively simple way to distinguish:

Salt by the ratio of 5:100 water, and then put different materials (mark) stainless steel screws in which to soak for 24 hours, and then observe the surface of the stainless steel screw there is no change, the general situation 201/202 stainless steel screws on the surface of some pores and bubbles, and the water will become iron-red rust, and 304/316L stainless steel screws will not get up the pores and red rust.

Please get in touch with me if you want high-quality stainless steel screws fasteners or technical support for structural design. Thanks.Email:adelajonly@gmail.com

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