Take you to understand the forging process and forging in detail

The difference between forging process and forging is that forging steel is to be hammered in all directions, and forging parts, the direction of force and the direction of component molding. The former is to improve the structure and performance of the forging part, the latter is more in order to get a specific forging shape.

Mill rolling, also known as rolling, refers to the process of making steel by rolling the metal on a rolling mill to change its shape. Forging is a steelmaking method that changes the structure and shape of the inner part through the impact force of the hammer after heating the metal and beating it many times.



Notes for forging: forging adhere to multi-heading, repeatedly upsetting, drawing long, mesh carbide and eutectic carbide broken, remove the inhomogeneity of carbide, after forging should pay attention to slow cooling and timely annealing.



Generally speaking, the longitudinal strength of rolled steel is greater than the transverse strength (the so-called "anisotropy"). In order to ensure better mechanical strength in all force directions (to achieve "isotropic"), the benefits of forging as a good solution are: It can remove the defects such as loose casting state produced in the smelting process of steel, optimize the microstructure, and obtain a complete metal streamline, so that the subsequent processing parts have better mechanical properties.

For example, the carbide precipitated during crystallization of Cr12 high carbon and high chromium cold working die steel is quite stable and cannot be refined by conventional heat treatment. The forging method can break the eutectic carbide, change its uneven distribution, play a role in refining, from the source to ensure the strength, toughness and service life of the die.

The forging not only makes the carbide distribution in the steel uniform, the strength and toughness increase, but also forms a reasonable streamline arrangement in the die, which makes the quenching deformation trend in all directions the same. Therefore, the die steel, especially the blank of precision die and heavy die, should be reasonably changed, which is not only related to the efficiency of manufacturing and processing and the quality of heat treatment, but also can significantly increase the service life of the die.



In general, the quality of the forging is much higher than that of the rolling stock, but actual market conditions may vary.

Most of the forging die steel seen on the market is produced by small factories. Small factory survival is not easy, is the lower price competition, this competition is very likely to occur jerry-building, resulting in the material is not up to standard; Second, even if the ingredients reach the standard, small factories are limited by equipment ability and technical strength, the quality of steel itself has congenital defects; After forging, it is necessary to cooperate with pre-heat treatment in time. The heat treatment capacity of many small factories is also unqualified.

In this case, the quality of forging material can be imagined. Cracking during processing or heat treatment is not uncommon. Users buy forging materials, the original intention is to pursue better material properties, but the result may be just the opposite.

This is not to say that the performance of forging steel material has no advantages, but the market status quo is such that if the pursuit of forging material, the risk of the material increases instead.

Under the premise of standard operation of initial rolling, forging process and heat treatment, the quality of forged parts is undoubtedly higher than that of machine rolled steel materials.