High temperature oxidation resistance stainless steel plates have high temperature oxidation resistance, but the oxidation rate will be affected by inherent factors such as environment and product form.
Among the steel products exported by China, steel pipe has always been the focus of foreign anti-dumping and countervailing investigations. The Russian Ministry of industry and trade announced an anti-dumping investigation on China's cold-rolled stainless steel seamless steel pipes exported to the Russian Belarus Kazakhstan customs union. Before that, the Brazilian foreign trade chamber also said that it would impose an anti-dumping tariff of US $743 per ton (about RMB 4748 yuan) on China's steel pipe products, which is valid for five years.
.600 Series & mdash; martensitic precipitation hardening stainless steel pipe.
410— Martensite (high strength chromium steel), good wear resistance and poor corrosion resistance.
.Process performance inspection: flattening test, tensile test, impact test, flaring test, hardness test, metallographic test bending test and nondestructive testing (including eddy current testing, X-ray testing and ultrasonic testing).
For example, if the actual thickness of stainless steel 51 round pipe is 0.9, the weight of a single 6-meter-long stainless steel pipe is (51-0.90.920.024916 = 87kg, the weight of a single 6-meter-long stainless steel pipe of stainless steel square pipe 7545 with a thickness of 0.92 is [(75 + 4214-014-0.920.920.024916 = 38kg). If the weight of stainless steel pipe per meter is calculated, and there shall be no tendency of intergranular corrosion.
4: stainless steel strip (stainless steel coil): or coil, coil, plate coil. There are many names, and the hardness of the strip varies from dozens to hundreds. The customer needs to determine which hardness to use first. (8K mirror luminosity)
Hardness test: annealed stainless steel pipes with inner diameter of more than 0mm and wall thickness of less than 13mm can be tested by w-b75 Vickers hardness tester, which is very fast and simple, and is suitable for rapid and nondestructive qualification test of stainless steel pipes. For stainless steel pipes with inner diameter of more than 30mm and wall thickness of more than 2mm, Rockwell hardness tester shall be used to test HRC hardness. Stainless steel pipes For stainless steel pipes with inner diameter greater than 30mm and wall thickness less than 2mm, the surface Rockwell hardness tester shall be used to test HRT or hrn hardness. For stainless steel pipes with inner diameter less than 0mm and greater than 8mm, the special Rockwell hardness tester for pipes shall be used to test hr15t hardness. When the inner diameter of stainless steel pipes is greater than 26mm, the Rockwell or surface Rockwell hardness tester can also be used to test the hardness of pipes.
The two ends of the 6m long steel pipe are mechanically cut, and the pipe end is relatively sharp to prevent direct contact with the sealing ring of the pipe fitting. It is necessary to cut off a small section at both ends of the pipe or grind off the corner edge with a hand grinder, and then clamp the pipe fittings.
ranking.The inventory of stainless steel pipes may be an important factor in market conditions. This is because at this stage steel inventory has become an important index to investigate and judge the situation of stainless steel pipeline shopping malls, and has become a wind vane to judge the future market trend. What was the stock of stainless steel tubes at that time? It directly affects the air of shopping malls, and then distributes the business behavior of participants in shopping malls
In the past few years, the United States has imposed anti-dumping and countervailing duties on a variety of steel pipe products exported from China, including ring welded pipe, rectangular pipe, pipeline pipe, welded stainless steel pressure pipe, oil well pipe and seamless steel pipe. These foreign double back pressures have greatly reduced the number of steel pipes exported by China.
Stainless steel with domestic (imported) stainless steel belt: stainless steel coil belt, stainless steel spring belt, stainless steel stamping belt, stainless steel precision belt, stainless steel mirror belt, stainless steel cold rolling belt, but improper use and maintenance will cause & ldquo; Floating rust& ldquo; Mildew & rdquo; And other undesirable phenomena.
Latest quotation.The corrosion resistance of duplex stainless steel, which is widely used in many media, is better than that of ordinary l austenitic stainless steel, while super duplex stainless steel has very high corrosion resistance. In some media, such as acetic acid and formic acid, it can even replace high alloy austenitic stainless steel and even corrosion resistant alloy.
When the addition of chromium reaches 5%, the atmospheric corrosion resistance of steel increases significantly, but when the chromium content is higher, although the corrosion resistance can still be improved, it is not obvious. The reason is that when alloying steel with chromium, the type of surface oxide is changed to be similar to that formed on pure chromium metal. This tightly adhered chromium rich oxide protects the surface from further oxidation. This oxide layer is very thin. Through it you can see the natural luster of the steel surface, which makes the stainless steel have a unique surface. Moreover, if the surface layer is damaged, the steel surface will react with the atmosphere to repair itself, re form this passive film and continue its protective effect.
The pipes for pipe cutting shall be professionally cut by stainless steel. Rotate it for two circles, then slightly tighten the piece and then rotate it for two circles until it is cut off. It must not be enough to allow personal strength to be in place at one time to lock the piece to cut off the pipe, otherwise the pipe end will be cut off, and the pipe fittings or rubber rings cannot be inserted; After the pipe above DN65 is cut, the internal and external burrs must be removed with a hand grinder, and an appropriate outer slope opening shall be opened at the same time to avoid damaging the sealing ring.
.Stainless steel belt, stainless steel conveyor belt, stainless steel packing belt, stainless steel belt, stainless steel coil belt, ultra-thin stainless steel belt.
Both ends of the steel pipe shall be cut into right angles and burrs shall be removed.
Windproof and ventilation. Where there is wind, please take measures to block the net, and take appropriate ventilation measures indoors.