Hardness QB square hardness is a pointer to measure the hardness and softness of metal materials. At present, 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.Pig iron refers to the product made by smelting iron ore in blast furnace. It is mainly used for steelmaking and square casting. Put the cast pig iron in the melting furnace to obtain cast iron (liquid), and cast the liquid cast iron into a cast square pipe. This kind of cast iron is called cast iron.Freihannes,The detailed steps for cutting square tubes are as follows: what is used for cutting square tubes? Seamless square tubes can only be processed successfully after certain steps in processing and engineering. The first step that must be experienced in processing is to cut seamless square tubes. There are various cutting methods for seamless square tubes. Today, I'd like to introduce a method of cutting seamless square tubes with slices, It is recommended to cut according to the following provisions: select a uniform surface to select potatoes; The large diameter is not too much, or they don't cut well; B choose sharp seeds, slightly larger ones, and small needles. Sometimes large potatoes are not long enough; C. select flat, sink and vegetable board. When it is uneven, it will be cut continuously; When the texture is light cut, the die-cutting board will follow.Tool derusting mainly uses tools such as steel wire brush to polish the surface of square pipe, which can remove loose or oxidized scale, rust,FreihannesGalvanized thick square pipe, welding slag, etc. The derusting of manual tools can reach grade SA and that of power tools can reach grade SA. If the square pipe surface is firmly attached with iron oxide scale, the derusting effect of tools is not ideal and can not reach the anchor depth required by construction.Langkiel,After chemical pickling, the square tube can be well protected by electrolysis. These are simple ways to prolong the service life of the square tube, We only need to treat according to these, so that the square tube can bring us great help in the use process. The cold galvanized square tube is the principle of cold galvanizing on the square tube used to make the square tube have corrosion performance. Different from hot-dip galvanizing, cold galvanizing coating is mainly carried out according to the electrochemical principle. Therefore it is necessary to ensure the sufficient of zinc powder and steel, so the steel surface treatment requirements are very high.Brinell hardness (HB),FreihannesGalvanized pipe supplier, Rockwell hardness (HRC) and Vickers hardness (HV) are commonly used.Large diameter qb square tube production standard classification square tube is divided according to production standard: national standard square tube, British standard square tube, American standard square tube, European standard square tube and non-standard square tube.

For oil, the oil brush work shall be carried out in accordance with the requirements of the rule system, so as to ensure the oil brush and the oil in the correct position of the brush and avoid wrinkles.It must be noted that in the overall process of square tube coating process, the cost of surface treatment is still relatively high, so it is very important to select appropriate treatment. Only by selecting the right treatment can the coating quality of square pipe be well guaranteed.Square tubes have different functions and different characteristics. Square tubes of various specifications, square rectangular tubes, seamless square tubes, galvanized square tubes and galvanized tubes are welcome to waste merchants, industries, enterprises and power departments to visit and negotiate! Oxidation will also occur on the surface of square tubes after long-term use. What should we do if oxidation occurs? Let me give you a detailed introduction on how to remove square tubes Oxide scale.Customer firstNormalized: A. pearlite steel; b. Bainitic steel; c. Martensitic steel; d. Austenitic steel.With the improvement of production quality, the quality of square tubes is getting better and better. The quality of square tubes will affect our lives. Because the functions of square tubes are different their characteristics and uses are different. I will introduce the characteristics and uses of square tubes in detail.Cold drawn or cold rolled precision square tube (gb-) is a cold drawn or cold rolled precision square tube with high dimensional accuracy and good surface finish for mechanical structure and hydraulic equipment. The selection of precision square mechanical structure or hydraulic equipment can greatly save machining hours, improve material rate and improve product quality.

Comprehensive classification ordinary steel A. carbon structural steel: (a) Q (b) Q (b); (c) Q( C)； (d) Q( B)； (e) Q.Home page recommendation,The floating mandrel mill is in its heydaySpray fluorocarbon paint after.Square tube for automobile half shaft sleeve (gb-) is a high-quality carbon structural steel and alloy structural steel hot-rolled square tube for automobile half shaft sleeve and drive axle housing.Freihannes,The advantage of empty bending is that it can bend the side length when the real bending cannot be carried out,FreihannesHot dip galvanized square pipe, such as synchronous bending and finishing of the upper side and side of qb square tube. Empty bending can also bend the inner corner of r.t without breaking the tube wall.Functional index analysis of qb square tube - commonly used are Brinell angle (HB), Rockwell angle (HRC) and Vickers angle (HV) of qb square tube. Angle is a gauge needle to weigh the soft and hard level of metal data. The angle method is rarely used to determine the internal angle in the current life. It uses the metal data surface tested under the fixed load of the indenter with a certain number and shape to determine its angle value according to the level of the object.Cleaning solvent and emulsion can clean the surface of square tube to remove oil, grease, agent and similar organic matter, but it can not remove rust, scale, welding, etc. on the surface of square tube, so it is only used as an auxiliary means in production.