Strength structural steel， with carbon content of .% - .%， adding main alloy elements such as manganese， silicon， vanadium， it is divided into four levels: ，Q345B square tube ，35 galvanized square pipeQuality improvement and MPa.
9Mechanical polishing: after processing， the parts have good levelness， short gloss， dull and rusty. Suitable for processing simple parts， medium and small products.
nWhen the vehicle is replaced with seamless square tube blank， the material is too soft to affect the requirements， so as to ensure the quality of parts and avoid wrinkles.
After isothermal quenching， qqb square tube will have excellent rolling fatigue characteristics and corrosion resistance. Wear resistance， fracture toughness，Q345B square tube impact toughness and bending strength. Therefore， in the subsequent production and application， qqb square tube will be used as the material of rolling mill flap ball screw. The qqb square tube of case hardening steel also has the surface compressive stress characteristics obtained by heat treatment， and its application range is expected to be improved and expanded.
FLocanoStainless steel qb square pipe for fluid transportation Standard No.: gbt-. The representative materials are Cr crni crni cr crninb， crnimo， etc. It is mainly used to transport low-pressure corrosive media.
RlThe square tube adopts the electric contact pressure gauge to press down the pressure of the oil cylinder on both sides of the conveyor to ensure the smooth transportation of the strip steel.
Square tubes have a good performance in practical application. When we choose square tubes in practice， we should choose them according to their characteristics. We have different types of square tubes in different fields. What is the difference between the characteristics of square tubes and ordinary steel tubes? Lets introduce them today to let us have a deeper understanding of each others tubes.
Compared with other traditional pipes， square pipe supply steel pipe has lighter raw materials， high strength， good resistance，Q345B square tube can withstand high internal pressure， sensitive application，35 galvanized square pipeQuality improvement and can get used to messy or bad geological conditions.
wReinforcing phases such as reinforcing particles， short fibers and whiskers can be added to the solder to form composites.
ZDrawing process flow of square tube in the production process of square tube， it needs a lot of processes to complete the production process， so that the production quality of square tube can be more strictly guaranteed. This paper mainly introduces the drawing process flow of square tube. Lets understand it below.
XScheme customizationThe level of R-angle square tube is generally - times of the wall thickness. R-angle square tube of the size required by customers can also be produced according to the needs of customers; Square tube is a kind of long steel with hollow section and no joints around. It is a square tube formed by four sides of seamless tube mold. Square tube has hollow section. It is specialized in selling square tube， square rectangular tube， seamless square tube， galvanized square tube， galvanized tube，Galvanized pipe_ Galvanized square pipe_ Seamless steel pipe_ Square tube - Wuxi Jiahang strict testing and quality assurance. In the process of preferential activities， welcome to consult. It is widely used as a pipeline for conveying fluid. It is mainly used in conveying， hydraulic support and mechanical structure， Medium and low pressure， heat exchange tubes， gas， oil and other industries. It is stronger than welded and will not crack.
The disadvantage of solid bending is that it has tensile thinning effect. The actual bending will produce tension at the bending point， and the tensile effect will shorten the longitudinal length of the bending line; The metal at the real bend will become thinner due to stretching.
Performance index analysis of square tube - impact toughness the load acting on the part at a great speed is called impact load， and the ability of metal under impact load is called impact toughness.
Welcome calls gApplication of square tube products: for mechanical equipment， solar energy equipment， steel structure， automobile parts， guardrail and ship internal structure.
AThe 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.
Mechanical property is an important index to ensure the end use performance (mechanical property) of square pipe， which depends on the chemical composition and heat treatment of steel. In the steel pipe standard， according to different service requirements， the tensile properties (tensile strength， yield strength or yield point， elongation)， hardness and toughness indexes， as well as the high and low temperature properties required by users are specified.
g， the blank holder area is insufficient， which easily leads to instability wrinkle; If the fillet is too small， the resistance of the material into the die will increase in the deformation process and the material is not easy to move and transfer inward， which may lead to tensile cracking.
sAShould choose thus increasing the large tensile stress in the force transfer area， it is recommended to match: epoxy zinc rich um + epoxy micaceous iron intermediate paint um + polyurethane finish paint um. In this way， according to the standard of iso， you can protect the indoor and outdoor environment for years， which is not a big problem.
The advantages of real bending are small reverse， accurate forming， the R of inner corner forming is more accurate. The disadvantage of solid bending is that it has tensile thinning effect. The actual bending will produce tension at the bending point， and the tensile effect will shorten the longitudinal length of the bending line; The metal at the real bend will become thinner due to stretching.