The painting of the square tube has to go through a process， which requires us to conduct comprehensive consideration and analysis. In particular， 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， but should be placed for a period of time and wait until the paint is dry!
7Shot blasting and sand blasting are widely used in repair and shipbuilding industry. However whether shot blasting or sand blasting， compressed air is used. Professional sales of square tubes， square rectangular tubes seamless square tubes，產品展示 galvanized square tubes，125 galvanized square pipeSexual factors in use galvanized tubes， high pressure rating， good waterproof performance， high temperature resistance， strong overload capacity， radiation protection and long service life. Of course， it is not shot blasting that requires high-speed rotating impellers. In the repair and shipbuilding industry， shot blasting (small steel shot) is mostly used in square pipe pretreatment (rust removal before coating); Sand blasting (mineral sand is used in repair and shipbuilding) is mostly used in formed ships or sections to remove the old paint and rust on the square tube and repaint it. In the repair and shipbuilding industry， the main function of shot blasting and sand blasting is to increase the adhesion of square tube coating paint.
dPrecision inner diameter square tubes for hydraulic and pneumatic cylinders (gb-) are cold drawn or cold-rolled precision square tubes with precision inner diameter for hydraulic and pneumatic cylinders.
Stainless steel qb square pipe for fluid transportation，產品展示 Standard No.: gbt-. The representative materials are Cr crni crni cr crninb， crnimo， etc. It is mainly used to transport low-pressure corrosive media.
QAnadaraIt 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.
ScAll seamless qb square tubes shall be tested for mechanical properties. Mechanical property tests are mainly divided into two categories: tensile test and hardness test.
In the process of square pipe， we will conduct a variety of tests on it to ensure that the square pipe can be better used in practice. In order to make better use of large-diameter steel pipe， we will continue to innovate. Lets introduce the main elements contained in the lower pipe. For the martensitic chromium square tube， the main elements affecting the are chromium， carbon and molybdenum; For Martensitic chromium nickel square tube， the main influencing elements are nickel，產品展示 molybdenum， aluminum，125 galvanized square pipeSexual factors in use cobalt， nitrogen and titanium.
In the process of square pipe， we will conduct a variety of tests on it to ensure that the square pipe can be better used in practice. In order to make better use of large-diameter steel pipe， we will continue to innovate. Lets introduce the main elements contained in the lower pipe. For the martensitic chromium square tube， the main elements affecting the are chromium， carbon and molybdenum; For Martensitic chromium nickel square tube， the main influencing elements are nickel， molybdenum，鍍鋅管_鍍鋅方管_無縫鋼管_方矩管 -無錫嘉航 aluminum， cobalt， nitrogen and titanium.
yThe square tube for fluid transportation (gbt-) is a general square tube for transporting water， oil， gas and other fluids.
DTherefore， QA is usually not preheated. However， when the plate is very thick， it should be preheated because it cools quickly. Once # steel was cracked by J welding. If the plate thickness is more than mm， there is a great risk of not preheating.
QRecommendation and consultationThe purpose of heat is to prevent the generation of cold cracks. Cold crack is directly related to carbon equivalent. Therefore， it is necessary to distinguish the carbon equivalent of the qb square tube， and the carbon equivalent of the qb square tube is the same. If the carbon equivalent of Q is less than .%， it can be said that the weldability is OK. Generally speaking， the cold crack increases when the carbon equivalent is .%.
sRFunctional index analysis of square tube - angular plasticity refers to the power of plastic deformation (permanent deformation) without destruction of square tube data under load.
The flattening speed of the sample can be ~ mmin.
Square tube is a kind of square tube type. Many materials can form square tube body. It is used for what purpose and where. Most square tubes are steel tubes， mostly structural square tubes， decorative square tubes and building square tubes. Square tubes can be divided into seamless and welded joints. Seamless square tubes are formed from seamless circular tubes.
Encyclopedic knowledgeoThe welded joints of square pipes are subject to on-line continuous ultrasonic automatic flaw detector to ensure the NDT coverage of spiral welds. If there are defects， it will automatically alarm and spray marks. The production will adjust the process parameters at any time to eliminate the defects in time.
WChange to square pipe: generally， the strip steel is unpacked， leveled， crimped and welded to form a round pipe， then rolled into a square pipe from the round pipe and then cut into the required length. Stage ( & mdash; )
before slicing. Highlight: push your hand straight up and down without bending and tremor. Dont know when its down. Take a constant speed and hand power to stabilize it. Dont slice or cut it completely.
bWhen the square tube is processed， it needs to be properly polished to ensure durability， including mechanical polishing， chemical polishing and electrochemical polishing.
dWAfter the process of polishing the surface effect of the square tube is quite good. The quality of the polishing process directly affects the external image of the square tube. Therefore， we must choose the appropriate polishing according to the above， and pay more attention to the polishing process of the square tube.
Hardness test is to use a hard indenter to slowly the sample surface according to the specified conditions， so as to determine the hardness of the material. Hardness test is simple， rapid and easy to implement in material mechanical property test. Hardness test is non-linear， and there is an approximate conversion relationship between material hardness value and tensile strength value. The hardness value of material can be converted into tensile strength value， which is of great practical significance.