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Forging refers to the use of forging machinery to apply pressure to metal billet to promote plastic deformation, so as to obtain a certain mechanical properties, specific shape and size of forging, it is one of the two major components of forging (including forging and stamping). Through forging, it can eliminate defects such as metal smelting, and optimize the microstructure. At the same time, because the complete metal streamline is retained, the mechanical properties of the forging is usually better than the casting of the same material. In the relevant machinery, for the important parts with high load and strict working conditions, except for the relatively simple shape that can use the rolled plate, profile or welding parts, most of the forgings will be used.

In the field of metal processing, quenching is a common and critical heat treatment process, designed to improve the hardness, wear resistance and strength of metal materials. Among them, high frequency quenching are two widely used quenching methods, which have unique characteristics and application range.

Given the wide variety of stainless steels, there are as many as over 140 types in the GB/T 20878—2007 standard, and approximately 200 types in practical applications. Stainless steel forgings differ in composition, performance, and usage, and there are numerous classification methods.

Disk-shaped forgings are often also called short-axis forgings. According to the difficulty of forming, their processing flow can be roughly divided into the following three different situations: ordinary forgings, high-hub deep-hole forgings, and high-rib thin-walled complex forgings. Generally speaking, their processing flow mainly covers key steps such as upsetting, vertical upsetting to remove the scale, and final forging. Next, let's have a more detailed and comprehensive understanding of the detailed elaboration in this regard.

Usually, the heat treatment of large forgings is often combined with the cooling of forgings. This is because the section size of large forgings is large and the production process is complex. During the heat treatment, due to the unevenness of the microstructure and properties of the forgings, some forgings are prone to white spot defects. Therefore, in addition to eliminating stress and reducing hardness, the main purpose of the heat treatment of large forgings is first to prevent the forgings from generating white spots, improve the uniformity of the chemical composition of the forgings, and adjust and refine the microstructure of the forgings.

Overnight, LME nickel fell 0.14%, while Shanghai nickel rose 1.07%. On the inventory side, LME nickel inventories rose 120 tonnes to 89,562 tonnes yesterday, while domestic SHFE warehouse orders fell 517 tonnes to 20,543 tonnes yesterday. In terms of the premium, the LME premium remained negative in 0-March; the imported nickel premium decreased by 50 yuan / ton to-50 yuan / ton.

1. Main iron and steel material characteristics and application fields

①Carbon steel

Carbon steel is an iron and ferric carbon alloy material containing carbon elements, usually containing between 0.12% and 2.0%. According to the different carbon content, carbon steel is divided into low carbon steel (carbon content is less than 0.3%), medium carbon steel (carbon content is 0.3% -0.6%) and high carbon steel (carbon content is more than 0.6%). Carbon steel has good plasticity, weldability and machinability, is widely used in structural parts, mechanical parts, automobile manufacturing and other fields.