Material classification: square pipe is divided into ordinary carbon steel square pipe and low alloy square pipe.
It is a kind of cleaning for the surface of square pipe. Shot blasting is often used to clean the casting surface or strengthen the surface of square pipe.
Heredia.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.
Drawing 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. Let's understand it below.
.Section shape classification square tube is classified according to section shape: simple section square tube: square tube, rectangular square tube.
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.
In the case of dynamic load, plastic design usually calculates the allowable stress according to the safety factor that the allowable stress is not less than the dynamic load and multiplied by the allowable stress. In the case of bending of an axis, it can be calculated by the formula a = W. replacing the calculated strength with plasticity can improve the bearing capacity of the member by 14%.
In order to ensure the stability of the perforation performance and chemical properties of the billet of the square tube, the technical regulations shall be strictly implemented in the operation of the circular furnace, the operation of the heating furnace shall be frequently the abnormal conditions shall be handled in time and recorded, and the follow-up posts and quality management department shall be notified in time for handling.
Square tube for automobile half shaft sleeve (gb3088-8) is a high-quality carbon structural steel and alloy structural steel hot-rolled square tube for automobile half shaft sleeve and drive axle housing.
The surface hardening treatment of qq355b square tube is generally isothermal quenching, that is, heat treatment technology. After isothermal quenching, qq355b square tube will obtain more and better properties, and make qq355b square tube be applied in more fields.
Analysis project.Tensile test is to form seamless q355b into a sample, pull the sample to fracture on the tensile testing machine, and then measure one or more mechanical properties. Usually, only tensile strength yield strength, elongation after fracture and reduction of area are measured.
Stainless steel q355b square pipe for fluid transportation, Standard No.: gbt12771-1991. The representative materials are 0Cr 0cr19ni 00cr19ni 00cr1 0cr18ni11nb, 0017cr17ni14mo2, etc., which are mainly used to transport low-pressure corrosive media.
First, remove the deposits on the surface of the square pipe surface with copper wire brush. Use the perfume oil or other scrubbing oil on the surface layer, or use phosphate or chromate solution, brush, spray or dip coating. After the fixed reaction time, rinse the acid solution with plenty of fresh water on the surface.
Should choose, in the end is galvanized or paint; For paint, it is recommended to match: epoxy zinc rich 50um + epoxy micaceous iron intermediate paint 80um + polyurethane finish paint 60um. In this way, according to the standard of iso12944, you can protect the indoor and outdoor environment for 10 years, and then made by hot rolling, cold rolling or cold drawing. Square pipe plays an important role in steel pipe industry.
Stage (1978 & mdash; 1992)
Chemical polishing: less investment in processing equipment, high speed, high efficiency and good durability. Its defects are poor brightness, demand for ventilation equipment and difficult heating. It is suitable for processing small batch of disordered parts and products with low brightness demand for small parts.
Heredia.Tensile test is to form seamless q355b into a sample pull the sample to fracture on the tensile testing machine, and then measure one or more mechanical properties. Usually, only tensile strength, yield strength, elongation after fracture and reduction of area are measured.
According to production, square tubes are divided into hot-rolled tubes, cold drawn tubes, tubes, pipe jacking, etc. According to the section shape, the square tube is divided into round and special-shaped. The special-shaped tube has many complex shapes, such as square, oval, angular, angular, melon seed, star and winged tube.
The inclusions in the square tube treated with calcium can be denatured well, and the morphology of sulfide in the rolled stock is also improved.