In the 1930s, wire ropes were designed and developed, mainly used in mine excavation lifting equipment. With the further development of the first industrial revolution, the use of wire rope has been popularized and used more widely.
In the dynamic system, the wire rope is widely used in the hoisting of the crane and elevator, the transmission of the mechanical power, the control of the car cockpit, the operation of the aircraft control system and so on. In the static system, New railings design and other industries, wire rope also has a wide range of applications.
With the early 20th century, the invention of stainless steel and the rapid development of new stainless steel materials are used in the field of wire rope manufacturing. With stainless steel material special physical and chemical properties, in Europe and the United States, stainless steel wire rope in many areas to be quickly accepted and popularized. Stainless steel wire rope manufacturing industry has developed rapidly, the rapid rise of many enterprises, domestic stainless steel wire rope has long been out of the country, export the world, the industry development prospects bright
Now a lot of industrial manufacturing products, will use stainless steel wire rope material production, in order to identify the stainless steel material shoddy, you can take some measures and methods. But many customers do not know what method can be used to identify
1, magnetic test method
Magnetic test method is the most primitive of the most common way to distinguish between austenitic stainless steel and ferritic stainless steel. The austenitic stainless steel is a non-magnetic steel, but it will have mild magnetic properties after cold pressing. Both chrome and low alloy steels are ferromagnetic steel.
2, nitric acid point test method
One of the salient features of the stainless steel wire rope is its inherent corrosion resistance to concentrated nitric acid and dilute nitric acid, which makes it easy to distinguish it from most other metals or alloys.
But the high-carbon type 420 and 440 steel in the nitric acid point test is slightly corroded, non-ferrous metals encountered concentrated nitric acid was immediately corroded, and dilute nitric acid on the carbon steel has a strong corrosive
3, copper sulfate test method
Copper sulfate test is a quick distinction between ordinary carbon steel and all types of stainless steel wire rope the most simple way, the use of copper sulfate solution concentration of 5% -10%, in the point before the test area should be completely clear the oil Quality or other impurities, and polished with a grinder or soft cloth to wear a small area, and then drop the test solution to the polished place, ordinary carbon steel or iron in a few seconds will form a layer of surface metal copper, and point of stainless steel The surface does not produce copper precipitation or show the color of copper.
4, sulfuric acid test method
Sulfuric acid soaked stainless steel can distinguish 302 and 304 from 316 and 317. The trimming of the sample shall be finely ground and then washed and passivated for half an hour in sulfuric acid at a volume concentration of 20% to 30% and at a temperature of 60 to 66 ° C. The volume concentration of the sulfuric acid solution is 10% and heated to 71 ° C , 302 and 304 are immersed in the solution, the steel is rapidly corroded and produces a large number of bubbles, the sample in a few minutes to black; and 316 and 317 steel samples are not subject to corrosion or corrosion is very slow (no bubbles) Test in 10 to 15 minutes do not change color. The test can be made more accurate by using a test with a sample with a known composition at the same time.
What are the common uses of stainless steel wire rope?
1, general purpose stainless steel wire rope (including galvanized steel wire rope): the use of the range
2, stainless steel wire rope for the elevator: for high-rise buildings in the elevator equipment, the requirements of the structure close, soft, structural elongation is small, usually 8-strand structure.
3, aviation stainless steel wire rope: for aircraft on the sailing or navigation cable, requires a high fatigue performance and corrosion resistance.
4, oil wire rope: bearing strong, corrosion resistance
5, aerial ropeway and cable car rope: for air transport track, with the cable car as a means of transport, requiring a greater safety factor wire rope, corrosion-resistant, stainless steel rope surface smooth
6, lifting stainless steel wire rope: wire rope required high tensile strength, soft and good performance, do not rotate resistance to distortion fatigue, not loose.
7, fishing with stainless steel wire rope: for trawling, network, network, and so on, are in rivers, lakes, sea water work, requiring corrosion resistance, soft performance.