Thick wall seamless steel tube rolling crack situation:The thick wall seamless steel pipe steel hot rolling crack location 38118 m away from the strip head respectively, mainly is located in the middle of the strip.By rolling crack of big hole morphology speculate that tear started in the middle of the strip width, the reason is that in the process of rolling rolling force and shear force caused by rupture tensile and the formation of a clear macro big hole morphology.
Cold rolled seamless steel pipe steel in the production process of interruption with fracture surface is smooth, no obvious surface defect before and after fracture.But on the fracture microstructure observation, is a typical toughening, ductile impact beam tubes fracture morphology, fracture presents layered shape at the same time, the center of toughening nest is bigger, near the surface of ductile fossa narrow, crack spread present mainly center fracture extension type fracture morphology, fracture depth is deeper, the center at that this broken belt of layered morphology is closely related to the center segregation situation.
In the storage of seamless steel tube, the priority for selecting suitable sites, we need think about many external factors, corrosion of steel pipe and so on, so the site must be cleaned clean, dry and ventilated, harmful gas present place, Seamless steel tube are not present, weeds and other debris to keep clear of in time, to keep the steel surface clean. If warehouse such as acid and alkali salt easily with the steel pipe, the steel corrosion, so as far as possible to separate, don't let it touch.
Else, if higher prices on the metal, can think in very good to keep beam impact tubes in the warehouse. On the basis of geographical conditions, have sealed type warehouse, but ventilation set outstanding
Precision steel tube is characterized by high precision, and it is not easy to rust. But is not to say that since precision steel tube is not easy to rust we usually they will take care of it, directly put it aside. It would be side impact door beams wrong to do so because if precision steel tube ordinary maintenance, it will shorten the service life, also can bring unnecessary loss to our precision steel pipe. Customers buy precision steel tube inevitably, pushed for a longer service life, so you should pay attention to the daily maintenance of precision steel pipe.