Stage ( & mdash; )
Square pipe for conveying flammable and non flammable fluids， Standard No.: gbt (gbt - ). The representative material is l-l pipeline steel. It is mainly used to transport flammable and non flammable fluids. Low pressure or high pressure square pipes have high requirements. The purpose of large-diameter qb square pipe is qb square pipe，La luville18 galvanized square pipe， C-shaped steel and H-shaped steel. It is mainly used in the construction of simple plant， steel structure and other infrastructure. Qb square pipe is generally used as the frame and purlin of the plant. C-shaped steel Steel is an important support for the plant， and H-section steel is used as load-bearing. Especially in recent years， a large number of small and medium-sized enterprises have started to build spacious and bright plants. If traditional buildings are built， the time is slow， the work progress is affected， and the investment is large. For some small and medium-sized enterprises， the capital will be produced after operation Serious impact. The plant built with qb square tube， C-section steel and H-section steel has the characteristics of time saving， money saving and fast use. Therefore， the sales of qb square tube， C-section steel and H-section steel have increased significantly in recent years and become the first choice for plant construction. Qb square tube， C-section steel and H-section steel are mainly used in the construction of simple plant， steel structure and other infrastructure The qb square tube is used as the frame and purlin of the plant. The C-shaped steel is used as the important support of the plant， and the H-shaped steel is used as the load-bearing. Especially in recent years， a large number of small and medium-sized enterprises around the country have started to build spacious and bright plants. If the traditional buildings are built， the time is slow， the work progress is affected， and the investment is large. For some small and medium-sized enterprises Said that if the investment in the plant is too high， it will have a serious impact on the capital after operation. The plant built with qb square pipe， C-section steel and H-section steel has the characteristics of time saving， money saving and fast use. Therefore， the sales of qb square pipe， C-section steel and H-section steel have increased significantly in recent years， becoming the first choice for plant construction. Large diameter qb square pipe plant is introduced Shao measures for effective wrinkle of seamless square pipe: check the wrinkle state， even when the wrinkle around the part is determined to be less than the clamping force， and the gradual increase of the roll gap force can be. When drawing the cone and hemispherical components， it should be increased to increase the inner diameter of the inner plate and the tensile stress of the wrinkle drawbead. Adopt the principle of loosening after tightening to loosen after tightening and ask Question.
La luvilleThe cutting surface of the square tube shall be true circle， and the cutting line shall be at right angles to the axis of the square tube. Excessive force is the reason for cutting the square tube into flat or oval，La luville25 price of galvanized square pipe， so the square tube should be cut with appropriate force.
According to smelting classification and furnace type A. open hearth steel: (a) acid open hearth steel; (b) Alkaline open hearth steel.
Xu ShiIn this period， the technology of continuous rolling pipe was not mature.
If there is only a single plane weld， the step-by-step back welding shall be adopted from the middle，La luville200 galvanized pipe， that is， ammoniated steel and surface quenching steel; (c) Easy to cut structural steel; (d) Steel for cold plastic forming: including steel for cold stamping and steel for cold heading.
Put the pig iron for steelmaking into the steelmaking furnace according to the specified process to obtain steel. The products of steel include ingots， continuous casting billets and various steel castings made of straight square tubes. Generally speaking， steel refers to the steel rolled into various square tubes. Square tube steel belongs to ferrous metal， but steel is not completely equal to ferrous metal.
Hardness test is to determine the hardness of seamless qb 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.
Hot dip galvanized square tube is a kind of square tube which is welded after using steel plate or steel strip to curl and form， and on the basis of this square tube， the square tube is placed in the hot dip galvanized pool and formed through a series of chemical reactions; The production process of hot-dip galvanized square pipe is relatively simple， but the production efficiency is very high and there are many specifications and varieties， but this kind of square pipe needs little equipment and capital， which is more suitable for the production of small galvanized square pipe manufacturers.
projectHigh pressure oil pipe for diesel engine (gb-) is a cold drawn square pipe for high pressure pipe of diesel engine system.
The reason why it is divided into two types is that chemical cleaning can only clean the surface very thoroughly， and it is difficult to achieve the desired results in some fine cracks.
Superior square tubular steel (both P and s ≤ .%)
Section shape classification square tubes are classified according to section shape: simple section square tubes & mdash& mdash; Square tube， rectangular tube and complex section square tube & mdash& mdash; Surface treatment classification of flower shaped square pipe， open square pipe， corrugated square pipe and special-shaped square pipe square pipe is divided into hot-dip galvanized square pipe， electro galvanized square pipe， oil coated square pipe and pickling square pipe according to surface treatment. Square pipe is classified according to purpose & mdash& mdash; Square tubes for decoration， machine tools and equipment， machinery industry， chemical industry steel structure， shipbuilding， automobile， steel beam and column and special purpose are classified by wall thickness & mdash& mdash; Super square tube， square tube and thin-walled square tube plasticity refers to the ability of metal materials to produce plastic deformation (deformation) without deformation under load.
DiscountZinc layer thickness: there is a great difference between cold galvanized square pipe and hot galvanized square pipe in galvanizing process; Cold galvanized square pipes are prone to & ldquo; Electric burning & rdquo; The color of this part is gray and the zinc layer is thick. It is easy to form a current dead angle at the corner， resulting in an under current area. The zinc layer at this part is thin， and there is no zinc layer attached to the cold galvanized square pipe. The cold galvanized square pipe has no zinc lump and caking as a whole， but the overall zinc layer is thin， and the thickness of the outer wall zinc layer is μ m-μ m. The and outer walls of the hot-dip galvanized square tube are attached with zinc layer， and there will be water marks and a few zinc tumors， but the overall zinc layer is thick， and the thickness of the zinc layer on the inner and outer walls of the square tube is -mu; M above. The nature of QB square tube!
D. do not cut your hands boring， especially for girls. Holding or fingers will bind themselves.
Comprehensive classification ordinary steel A. carbon structural steel: (a) Q (b) Q (b); (c) Q( C)； (d) Q( B)； (e) Q.
La luvilleWith the progress of the times and the faster and faster economic development， because Baosteel"s materials are subject to grade flaw detection and the density of steel is relatively good. After cold drawing and heating， it is convenient to line up. The steel is cold drawn at room temperature to produce plastic deformation， so as to improve the yield strength. This process is called cold drawing strengthening. Square tube is generally used for product parts with high requirements. It has good willfulness and strength. The surface is better after cold drawing. Cold drawing principle.
Square tube heating process square tube calculates the chip thickness of workpiece. After each regrinding， the main drive AC motor spindle rotates stepless speed change AC motor feed capacity stepless speed change feed fast return to a constant value center system brush device hydraulic saw cutting system system system represents the quality RA flatness， large burr height cutting Chip length tolerance dimension: width and length . ~ .mm ~ m ~ ~ min kW ~ rpm ( kw ~ mmmin mmmin .kw .kw & times; kW S & mu; m . mm & plusmn; mm about mm about mm about mm high. The total weight of each billet square tube is seconds (including， pipe blank cutting， opening device pipe blank discharge， head and tail cutting time， but excluding pipe blank transportation time). The large production capacity of the three saws is T / A. the pipe blank saw has a special reversing device (hydraulic servo device) to reduce vibration and improve the service life of the saw (only during feeding). The sawing machine has two devices distributed at the inlet and outlet (the input area is supported by roller table to ensure the bending of billet) The inlet end after sawing. Open it to ensure that the saw blade does not contact the blank when it returns. & mdash; feed saw gear & mdash; saw gear vibration reduction， which is composed of a fixed gear vibration reduction， as a movable vibration reduction to avoid the axial of the saw blade. & mdash; brush and sweep device & mdash; a driving brush and sweep device is installed at the bottom of the saw blade to clean the iron filings on the teeth and will not affect the service life of the saw blade. &Mdash; saw blade. In order to improve the service life of the saw blade a small amount of high load agent container is atomized by air and poured on the saw blade without residue. & mdash; saw blade cooling device. A special nozzle is used to spray cold air at - oC on the saw blade. The cut-off blank is transferred to the buffer chain in front of the loader after passing through the outlet roller table and weighing device (Note: # before sawing， there is a feeding bench for single size billets that need to be cut， and after weighing， there is a feeding bench for returned billets). The buffer transfer chain transports the billets to the lower roller table of the loader. The billets are turned over from the chain to the roller table by the turnover hook. The weighed qualified billets are loaded into the annular furnace by the loader， and the weighed unqualified billets are transported from the roller table to the removal bench for removal.