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How does q345qd steel plate resist wear?

Posted by: Alloy 2021-07-15 Comments Off on How does q345qd steel plate resist wear?

How does q345qd steel plate resist wear?

  • 1. The wear-resistant layer resists the wear of the wear medium, and the substrate receives the load of the medium, so it has good impact resistance and can accept the high drop and equal impact in the material transportation system. Good heat resistance: q345qd steel plate is recommended for use in ≤ Used under 650℃ working conditions, if alloys such as vanadium and molybdenum are added to the q345qd steel plate, it can accept high temperature wear of ≤800℃.
  • 2. The recommended application temperature is as follows: ordinary carbon steel substrates are recommended for use under 420℃; low alloy heat-resistant steel plates (15CrMo, 12Cr1MOV, etc.) substrates are recommended for use under 580℃; heat-resistant stainless steel substrates are recommended for use under working conditions. Used in working conditions higher than 800℃. Better corrosion resistance The alloy layer of q345qd steel plate contains a high percentage of metallic chromium, so it has certain rust and corrosion resistance.
  • 3. It can be used in occasions such as coal hoppers and hoppers to avoid coal sticking. Higher price performance ratio q345qd steel plate has a very high performance price ratio. Compared with ordinary steel plates, the service life can be increased by more than 10 times, which greatly reduces repair costs and downtime losses. Therefore, its performance-price ratio is 3 to 6 times that of ordinary materials.

Surface porosity is a common defect of q345qd steel slab, especially on the small standard Φ150mm section. Once it occurs, it requires a lot of manpower and material resources to gather and grind the defective billet. At the same time, a lot of discarded blanks were presented, which is more harmful.

When we make a q345qd steel plate, we must perform related heat treatment. After preheating, forging and processing are carried out. The processing technology and use are also relatively good. So the time and division temperature of the heat treatment of q345qd steel plate is indeed a technical activity. The temperature must be properly controlled, so how to control the temperature?

The heating temperature of q345qd steel plate is 800-830℃, and the heat preservation time is determined according to the furnace loading method. Tempering temperature: 320℃, always sufficient, oil cooling after tempering, reduce temper brittleness. The treatment is to pay attention to the deformation of the workpiece, and it is best to have anti-deformation tooling. It is best to press hardened back.

q345qd steel plate is easy to overheat, pay attention to the heating temperature and heat preservation time. It is recommended to heat up to 820°C for proper insulation. Tempering temperature: 320℃ should be sufficient at all times. Hardness: 45-48HRC has better application performance. Salt bath NaCl:BaCl=3:7 can be heated at a temperature of 820℃, time 30 seconds/mm (mm refers to the effective thickness of the part), oil cooling. The tempering temperature is 280℃, the air furnace time is 2 hours, and the nitrate furnace time is 30 minutes (for reference only, the specific temperature and time depends on the technical requirements).

The rolling of seamless q345qd steel plate requires high temperature, and can be manufactured after high temperature melting and rolling. The raw material of rolled steel pipe is round tube billet, and the round tube billet must be cut and processed into a length of about 1 meter through the cutting machine. The blanks are sent to the furnace for heating via the conveyor belt.

The billet of the q345qd steel plate is fed into the furnace and heated at a temperature of approximately 1250°C. The fuel is hydrogen or acetylene. The temperature control in the furnace is a key issue. After the round tube billet is out of the furnace, it is pierced through a pressure piercing machine. Generally, the more common piercing machine is the tapered roller piercing machine. This type of piercing machine has high production efficiency, good product quality, large perforation diameter expansion, and can wear a variety of steel grades. After piercing, the round tube billet is cross-rolled, continuously rolled or kneaded by three rolls one after another. After kneading, take off the tube and calibrate. The sizing machine rotates at a high speed through a conical drill bit into the steel blank to punch holes to form a steel pipe. The inner diameter of q345qd steel plate is determined by the length of the outer diameter of the drill bit of the sizing machine. After the q345qd steel plate is sized, it enters the cooling tower and is cooled by spraying water. After the q345qd steel plate is cooled, it will be straightened.

After the q345qd steel plate is straightened, it is sent to the metal flaw detector (or hydraulic test) by the conveyor belt for internal flaw detection. If there are cracks, bubbles, etc. inside the steel pipe, it will be detected. After q345qd steel plate quality inspection, strict manual selection is required. After q345qd steel plate quality inspection, paint the serial number, standard, production batch number, etc. with paint. It is hoisted into the warehouse by a crane.

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