What material is 30CrMnSiA
30CrMnSiA steel plate is an alloy structure steel plate. 30CrMnSiA implements GB/T3077 and GJB2150A two standards, of which GJB2150A is the national military standard, but also the current market demand is relatively large one.
This steel has high strength and toughness and is suitable for the manufacture of mechanical parts requiring high tensile, high bending and high impact, such as vehicle chassis, reinforcing plates, motorcycle chassis and shaft parts. Therefore, it is widely used in automotive, aerospace, construction engineering, petrochemical, rail transit and other fields.
Its specifications are generally 3mm ~ 50mm in thickness and 1000mm ~ 1800mm in width. In the production process, the hot rolling process is used to ensure that the steel has a certain plasticity and toughness, and the surface finish is high. At the same time, the composition design and heat treatment are also optimized to improve the weldability and corrosion resistance of the product.
In general, 30CrMnSiA steel plate has good mechanical properties and comprehensive properties, and can meet the needs of high strength and low alloy structural steel in a variety of different fields. With the continuous progress of technology and the development of the market, its application prospects will be broader.
30CrMnSiA heat treatment process
The heat treatment process of 30CrMnSiA alloy steel generally includes two steps: quenching and tempering. 1. Quenching will be heated 30CrMnSiA steel parts in the air or oil rapid cooling, so that it reaches a state of high hardness and high strength. The quenching temperature is generally about 860 ° C, and the quenching medium can be air, water or oil according to the specific situation. 2. Tempering after quenching, the brittleness of 30CrMnSiA steel is very high. In order to improve its plasticity and toughness, it needs to be tempered. The choice of tempering temperature and time depends on the required mechanical properties. The general tempering temperature is about 500 ° C, and the time is more than 2 hours. Higher tempering temperatures reduce hardness, but also reduce wear and heat resistance. In addition, before quenching and tempering treatment, it is also necessary to preheat 30CrMnSiA steel to eliminate internal stress and improve the machinability of the material. The preheating temperature is generally about 500℃, and the time is about 2 hours.
30CrMnSiA welding properties
30CrMnSiA material has good weldability, and the commonly used welding methods are manual arc welding, gas shielded welding, submerged arc welding and electron beam welding. Among them, gas shielded welding is the most commonly used method, and the commonly used protective gases are pure Ar gas and mixed gas. Preheating treatment should be carried out before welding, the usual preheating temperature is 250-300℃, and annealing treatment should be carried out after welding, so that the organization of the welding area is homogenized and softened, and the strength and plasticity of the weld should be improved.
