Chemical polishing: less investment in processing equipment, high speed, high efficiency and good durability. Its defects are poor brightness, gas overflow, the hardness method is commonly used to measure the hardness in production. It uses the indenter with fixed geometry to measure the hardness value of the metal material surface tested under fixed load according to the degree of hardness.
Ajax.Stage (1961 & mdash; 1978)
Under the international investigation, there has been a new improvement, which ensures that the square tube can be used for a long time. With the development of the times, square tubes are used in more and more fields. So how can we correctly choose square tubes? Next, I will introduce the process of square tubes for you.
.You can really feel that the square tube is widely used in the development, and q355b square tube factory continues to extend in the technical level,Ajax350 galvanized pipe, which makes the current square tube develop more widely.
The painting of the square tube has to go through a process which requires us to conduct comprehensive consideration and analysis. In particular, but should be placed for a period of time and wait until the paint is dry!
Square pipe the quality and level of the paint and the relevant technical level deserve our attention. Note that the square tube should not be used immediately after painting, is referred to as square pipe and rectangular pipe for short. The allowable deviation of wall thickness of square pipe is f and J q355b respectively. When the wall thickness is no more than 10mm, it shall not exceed plus or minus 10% of the nominal wall thickness. Long term square pipe, rectangular pipe, seamless square pipe, galvanized square pipe, galvanized pipe, 20-year-old brand, price advantage and quality guarantee! When the wall thickness is greater than 10mm, it is plus or minus 8% of the wall thickness, except for the wall thickness of corners and weld areas.
Hot rolled q355b square tube continuous casting slab or blooming slab is used as raw material, heated by stepping heating furnace and descaled by high-pressure water into roughing mill. Roughing material enters finishing mill after head cutting, tail cutting and then computer rolling. After final rolling, it is rolled into straight hair coil through laminar cooling and coiler. The head and tail of straight hair curl are often tongue shaped and fish tail shaped, with poor accuracy of thickness and width, and there are often defects such as wave shape, hem, tower shape and so on. The coil weight is heavy and the inner diameter of the steel coil is 690mm.
Superior square tubular steel (both P and s ≤ 0.035%)
Now, Fangguan can achieve such good results in the market, which is completely inseparable from the manufacturers' hard work in technology. I believe that the Fangguan market will be better and better in the future.
Do a good job in the following aspects to effectively improve the use of square tubes
Except for the thickening of the wall thickness, the corner size and edge flatness of the square pipe are uniform
how much.Hardness test is to determine the hardness of seamless q355b square pipe by slowly pressing a hard indenter on the sample surface according to the specified conditions, and then testing the indentation depth or size.
Because the green billet can be pressed into any shape, it is easy to weld the square tube into difficult products.
Square pipe is an important type of square pipe, which has great similarities with seamless steel pipe, but it is different. Square pipe is of great use in square pipe, which is generally used in the field of building materials and pipes. Today we tell you about the painting of square pipe. In fact, most manufacturers need to do this function, not only painting but also galvanizing. Zinc will precede others The base material of the square tube is corroded. If painting is not for you, it will cost you two money. If painting, it is recommended that you brush the zinc rich primer, because you brush other paints, so as to achieve the top coat on the zinc rich primer. In fact, you should brush the zinc rich primer before galvanizing
Ajax.Banded due to improper hot working temperature, that is, when the hot working stop forging temperature is in the phase zone (between, and 40), ferrite precipitates in bands from austenite along the metal flow direction, and the undigested austenite is cut into bands. When it is cooled to a, the banded austenite is transformed into banded pearlite. This can be improved or eliminated by increasing the final rolling temperature, increasing the forging ratio, diffusion annealing and normalizing.
The quality of the solid square tube after the square tube formwork removal and curing can be tested according to the requirements and the following ways: use a magnifying glass to observe whether there are non external force cracks on the structural surface of the solid seamless q355b square tube. When non external force cracks appear on the surface of q355b square pipe the crack width on the structural surface of ordinary q355b square pipe shall not be greater than 0.20mm.
Shot blasting is a high-speed rotating impeller that throws small steel shot or small iron shot out and hits the surface of the square tube at high speed, so the oxide layer on the surface of the square tube can be removed. At the same time,AjaxGalvanized pipe manufacturer,AjaxWelded square pipe, the steel shot or iron shot strikes the surface of the square tube at high speed, resulting in lattice distortion and deformation on the surface of the square tube and increasing the surface hardness