Hot rolling is relative to cold rolling, cold rolling is below the recrystallization temperature of rolling, and hot rolling is above the recrystallization temperature of rolling. Process flow: raw material (cold rolled steel coil) uncoiling shear end welding 8594 alkaline spray washing alkaline washing electrodegreasing 8594; water washing first water washing 8594; second water washing hot air dry 8594 inleloop 85Reducannealing 8594 hot dip galvanizing 85zinzinc layer control 8594 cooling 8594 \8594 8594 8594 electrodegreasing 8594 \\\\\\\\\\\Drying to Export It is composed of electrostatic oiling, export cutting, coiling, unloading, volume weighing, packaging and warehousing.
Hello, the hot-dip galvanizing of steel pipes adopts the mechanical principle of dialing in, pressing down, screw, pulling out and lifting by the full-dip semi-automatic galvanizing method of tooth disc to complete the hot-dip galvanizing process.
1. Process parameter control: zinc liquid temperature should be controlled between 440-460%, zinc dipping time should be controlled between 30-60 seconds, aluminum content (zinc liquid surface aluminum content 0.01-0.02%).
2, the use of zinc ingots should be the national standard Zn0-3 zinc ingots.
3. Maintain and control the reliability of pull-in screw and pull-out lifting device, strengthen the lubrication of cylinder, adjust the height and angle of galvanized pipe distributor, and adjust the equipment to the best state.
4. The position of the proximity switch should be accurate; the thermocouple wires and watches should be used in a unified model; otherwise, the temperature error is large, and the protective sleeve of the thermocouple should be checked and replaced frequently.
5. Operators of the operating table should adjust the speed manually to prevent pipe jamming according to the operation of the equipment before the furnace and the gesture command.
6. The tools used in front of the furnace should be preheated before being used to prevent people from being injured by zinc splashing; the steel pipes should be cleared if they fall into the pot; and the equipment should be adjusted in time to ensure the safety of the equipment.
What is the technological process of hot rolled seamless steel pipe? Recommended answer: (1) main production process of hot rolled seamless steel pipe (main inspection procedure):
Preparing and checking of tube blank heating of tube blank piercing rolling reheating of tube sizing heat treatment straightening finishing checking storage
(II) main production processes of cold rolled (drawn) seamless steel tubes:
Billet preparation, pickling, lubrication, cold rolling (drawing), heat treatment, straightening, finishing, and testing.
Hot-rolled (extruded seamless steel pipe): tube blank heating perforation three-roll cross-rolling, continuous rolling or extrusion stripping sizing (or reducing diameter) cooling straightening hydrostatic test (or flaw detection) labeling storage of seamless tube raw material is round tube blank, tube embryo to be cut through the cutting machine processing growth of about 1 meter, and The conveyor belt is sent to the furnace for heating.
The billet is heated into a furnace and the temperature is about 1200 degrees Celsius.
The fuel is hydrogen or acetylene.
The temperature control in the furnace is a key problem. The round tube billets need to pass through the pressure perforator after they are put out.
The common piercer is conical roller piercer. This kind of piercer has high production efficiency, good product quality, large piercing enlargement and can pierce many kinds of steel.
After piercing, the round billet is successively rolled, rolled or extruded by three rolls.
After extrusion, the diameter must be removed.
The sizing machine punched through the tapered bit into the steel embryo to form a steel pipe.
The inner diameter of the steel pipe is determined by the length of the diameter of the drill bit.
After sizing, the steel pipe enters the cooling tower and is cooled by spraying water. After cooling, the steel pipe will be straightened.
After being straightened, the steel pipe is sent to the metal flaw detector (or water pressure test) through the conveyor belt for internal detection.
If there are cracks inside the steel pipe, bubbles and other problems will be detected.
After the quality inspection, the steel pipe should be selected by strict manual selection.
After the quality inspection of the steel pipe, paint numbers, specifications, production batch numbers and so on.
The crane is hoisted into the warehouse.
What is the technological process of the heat shrinkable sleeve? Recommended Answer: In production, the heat pipe is heated to a high elastic state, the load is applied to make it expand, while maintaining the expansion of the rapid cooling, so that it enters the glass state, this state is fixed.
When heated, it will return to high elastic state, but when the load is gone, it will shrink back.
In short, granulating - extrusion - radiation crosslinking - expansion - Packaging - finish.
The thermoplastic polyolefin (TPO) is used as the base material, and flame retardants and additives without toxic substances are added to form a composite polymer material. After extrusion, some segments of the linear molecule are crosslinked to form a "shape memory" after being irradiated by gamma rays or bombarded by high energy electron beams. "Solid" material, heating and expanding the diameter several times after the original cooling stereotypes.
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