1. The plastic
Plasticity refers to the ability of a metal material to produce plastic deformation (permanent deformation) without damage under load.
2. The hardness
Hardness is a gauge of how hard or soft a metal material is. In this life in the production of hardness measurement method is the most commonly used in the indenter hardness method, it is to use a certain geometric shape of the indenter head under a certain load into the surface of the metal material to be tested, according to the degree of the indenter to determine the hardness value.
Commonly used methods are Brinell hardness (HB), Rockwell hardness (HRA, HRB, HRC) and Vickers hardness (HV) and other methods.
3. The fatigue
Strength, plasticity and hardness are indicators of the mechanical properties of metals under static load. In fact, many machine parts are operated under cyclic loads, and fatigue can occur under these conditions. The way also needs to have other section shape of special-shaped steel pipe.
Low pressure fluid transport welded steel pipe (GB/T3092-1993) is also known as general welded pipe, commonly known as black pipe. It is a welded steel pipe used for conveying water, gas, air, oil, heating steam and other general lower pressure fluids and other purposes. The wall thickness of steel pipe is divided into ordinary steel pipe and thickened steel pipe. Pipe end form is divided into non - rebar steel tube (light tube) and with rebar steel tube. Steel tube specifications are indicated by nominal diameter (mm), which is an approximation of the inner diameter. It is customary to use inches, such as 11/2. The welded steel pipe used for low pressure fluid transportation is mainly used as the original pipe of galvanized welded steel pipe used for low pressure fluid transportation.
Galvanized welded steel pipe for low pressure fluid transportation (GB/T3091-1993) is also known as galvanized electric welded steel pipe, commonly known as white pipe. It is a hot dip galvanized welded (furnace welding or electric welding) steel pipe used for conveying water, gas, air oil, heating steam, warm water and other general low pressure fluids or other purposes. The wall thickness of steel pipe is divided into ordinary galvanized steel pipe and thickened galvanized steel pipe. The end of the pipe is divided into galvanized steel pipe without thread and galvanized steel pipe with thread.
Common carbon steel wire bushing (GB3640-88) is used to protect the wire in industrial and civil buildings, installation machinery and equipment and other electrical installation projects.
Straight seam electric welded steel pipe (YB242-63) is a steel pipe with longitudinally parallel welds. Usually divided into metric welded steel pipe, welded thin-wall pipe, transformer cooling tubing and so on.
Spiral seam submerged arc welded steel pipe (SY5036-83) for pressure fluid transportation is a spiral seam steel pipe, which is made of hot rolled steel strip as tube blank, often formed at warm temperature and welded by double-sided submerged arc welding method. The steel pipe has strong bearing capacity and good welding performance. It is safe and reliable to use after all kinds of strict scientific inspection and testing. Large diameter steel pipe, high transmission efficiency, and can save the investment of pipeline laying. Mainly used for conveying oil and natural gas pipelines.
The main performance of seamless square tube，The main process
1. Sanitary grade mirror tube process:
Tube billet heating - inspection - skin - - - perforation, pickling, grinding, dry lubrication, welding head, cold drawing, solid solution treatment, pickling, pickling passivation - inspection - cold rolled - oil - cutting head - dry - polishing, polishing, inspection, identification, finished product packaging
2. industrial pipe process
Tube billet heating - inspection - skin - - - perforation, pickling, grinding, dry lubrication, welding head, cold drawing, solid solution treatment, pickling, pickling passivation - inspection
3. Pipe welding process
Uncoiling, leveling, end cutting and welding, looping, forming, welding, welding bead inside and outside to remove - precorrection - induction heat treatment, sizing and straightening, eddy current testing, cutting, hydraulic pressure check, pickling, final inspection, packaging
4. seamless square tube process
Round steel pipe inspection - - - - heating perforation, sizing, hot rolling, flat head, inspection, pickling, ball annealing - cold drawn - molding - mouth - inspection
The main performance of seamless square tube，General purpose
1. Seamless steel pipe for structure (GB/T8162-1999) is used for general structure and mechanical structure of seamless steel pipe.
2. Seamless steel pipe for fluid transportation (GB/T8163-1999) is used for conveying water, oil, gas and other fluids in general seamless steel pipe.
3. Seamless steel tubes for low and medium pressure boilers (GB3087-1999) are high quality carbon structural steel hot-rolled and cold-drawn (rolled) seamless steel tubes, which are used for manufacturing superheated steam pipes, boiling water pipes for various structures of low and medium pressure boilers and superheated steam pipes, big smoke pipes, small smoke pipes and arch brick pipes for locomotive boilers.
4. Seamless steel tube for high pressure boiler (GB5310-1995) is used for manufacturing high pressure and above pressure water tube boiler heating surface with high quality carbon steel, alloy steel and stainless steel seamless steel tube.
5. High pressure seamless steel pipe for chemical fertilizer equipment (GB6479-2000) is suitable for the working temperature of -40~ 400℃, the working pressure of 10~30Ma chemical equipment and pipes of high quality carbon structural steel and alloy steel seamless steel pipe.
6. Seamless steel tube for petroleum cracking (GB9948-88) is suitable for furnace tube, heat exchanger and pipeline seamless steel tube for petroleum refinery.
7. Steel pipe for geological drilling (YB235-70) is used for core drilling by geological department, which can be divided into drill pipe, drill collar, core pipe, casing pipe and precipitation pipe according to its use.
8. Seamless steel pipe for diamond core drilling (GB3423-82) is used for diamond core drilling drill pipe, core rod, casing seamless steel pipe.
9. Oil drilling pipe (YB528-65) is a seamless steel pipe used for both ends of oil drilling thickening inside or outside. Steel pipe can be divided into two kinds: turning wire and non-turning wire. Turning wire pipe is connected with joint, and non-turning wire pipe is connected with tool joint by butt welding method.
10. Seamless carbon steel steel pipe for ships (GB5213-85) is a seamless carbon steel pipe used in the manufacture of class I pressure pipe system, class II pressure pipe system, boiler and superheater. The working temperature of seamless carbon steel pipe wall shall not exceed 450℃, and that of seamless alloy steel pipe wall shall exceed 450℃.
11. Seamless steel pipe for automobile axle sleeve pipe (GB3088-82) is hot rolled seamless steel pipe of high quality carbon structural steel and alloy structural steel for automobile axle sleeve pipe and axle housing pipe of drive axle.
12. High pressure tubing for diesel engine (GB3093-2002) is a seamless cold drawn steel tube for high pressure pipe of diesel engine injection system.
13. Seamless steel tubes with precision inner diameter for hydraulic and pneumatic cylinders (GB8713-88) are cold-drawn or cold-rolled precision seamless steel tubes with precision inner diameter for hydraulic and pneumatic cylinders.
14. Cold drawn or cold rolled precision seamless steel pipe (GB3639-2000) is used for mechanical structure, hydraulic equipment with high dimensional accuracy and good surface finish. The use of precision seamless steel pipe manufacturing machinery structure or hydraulic equipment, can greatly save machining hours, improve material utilization rate, and improve product quality.
15. Stainless steel seamless steel pipe for structure (GB/T14975-2002) is a hot-rolled (extruding, expanding) and cold-drawn (rolling) seamless steel pipe made of stainless steel, which is widely used in chemical, petroleum, textile, medical, food, machinery and other industries for corrosion resistant pipes and structural parts and parts.
16. Seamless stainless steel tubes for fluid transportation (GB/T14976-2002) are hot-rolled (extruded, expanded) and cold-drawn (rolled) seamless steel tubes made of stainless steel for fluid transportation.
17. Special-shaped seamless steel pipe is the general term for seamless steel pipe with other cross section shapes except round pipe.
Post time: May-23-2022