30CrMnSi steel, steel ML30CrMnSi. 30CrMnSi is a brand of alloy structural steel specified by the national standard of china. Unified digital code: A24302. Mass fraction (%): C: 0.27 to 0.34, Si: 0.90 to 1.20, Mn: 0.80 to 1.10, Cr: 0.80 to 1.10.
30CrMnSi steel heat treatment
Quenching heating temperature (DEG C): 880; coolant: Oil
Tempering heating temperature (DEG C): 520; coolant: water, oil
30CrMnSi steel mechanical properties
30CrMnSi steel tensile strength (b/MPa): 1100
30CrMnSi steel the yield point (s/MPa): 800
30CrMnSi steel elongation (delta 5/%): 10
30CrMnSi steel section shrinkage (PSI / %): 45
30CrMnSi steel impact absorbing energy (Aku2/J): 50
30CrMnSi steel binell hardness (HBS100/3000) (high temperature annealing or tempering): less than 229
30CrMnSi steel high strength quenched and tempered structural steel. 30CrMnSi steel has high strength and toughness, high hardenability, cold deformation, medium plasticity and good machinability. There is temper brittleness tendency, transverse impact toughness difference. Welding performance is good, but the thickness is greater than 3mm, should be preheated to 150 degrees, heat treatment after welding. General conditioning after use.
30CrMnSi steel used for the manufacture of various important parts of high load, high speed, such as gear, shaft, clutch, chain wheel, wheel shaft, shaft sleeve, bolt, nut, also used in the manufacture of wear resistance, high temperature parts, welding components such as variable load, high pressure blower blade, valve plate and non corrosive pipeline pipe.
The specifications of seamless steel tubes are usually expressed by outer diameter * wall thickness (unit: mm). Seamless steel tube can be divided into two categories: hot-rolled seamless steel tube and cold-rolled (CAST) seamless steel pipe according to production methods. Hot rolled seamless steel tubes are divided into ordinary steel tubes, low and medium pressure boiler tubes, high pressure boiler tubes, alloy steel pipes, stainless steel pipes, oil cracking pipes, geological steel pipes and other steel pipes, etc. Cold rolled seamless steel pipe (DIAL) in general, steel pipe for low and medium pressure boiler tube, high-pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, oil cracking tube and other steel tube, including precision steel pipe, carbon steel pipe, thin-walled steel, alloy thin-walled stainless steel thin-walled steel, special steel pipe etc.The outer diameter of hot-rolled seamless tube is generally greater than 32mm, and the wall thickness is 2.5-75mm. The outer diameter of cold rolled seamless steel tube can reach 6mm, the wall thickness can be up to 0.25mm, the outer diameter of thin-wall pipe can be 5mm, the wall thickness is less than 0.25mm, and the accuracy of cold rolling is higher than that of hot rolling. In pipeline engineering, hot rolling pipes are often used when the pipe diameter exceeds 57mm, and the cold drawn tubes are usually used when the pipe diameter is less than 57mm. Generally used seamless steel pipe is 10#, 20#, 30#, 35#, 45# and other high-quality carbon steel or 16Mn, 5MnV and other low-alloy structural steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other composite steel hot-rolled or cold rolled. Seamless tubes made of low carbon steel such as 10# and 20# are mainly used for fluid delivery pipelines. A seamless tube made of medium carbon steel such as 45# and 40Cr; used to make mechanical parts such as automobiles and tractors. General use of seamless steel pipe to ensure strength and flattening test. Hot rolled steel tubes are delivered in hot rolling or heat treated conditions. Cold rolled in heat treated state. Hot rolling, as the name suggests, is of high temperature and therefore has little deformation resistance and can achieve large deformation. Taking the steel plate rolling as an example, the thickness of the continuous casting slab is about 230mm, and the final thickness is 1~20mm after rough rolling and finishing rolling. At the same time, because of the small width to thickness ratio and low requirement of dimension accuracy, it is difficult to control the crown shape. As for the requirements of the organization, it is generally realized by controlling rolling and controlling cooling, that is to say, to control the rolling temperature, the final rolling temperature and the coiling temperature of the finishing mill to control the microstructure and mechanical properties of the strip. The main alloying elements in alloy seamless steel tubes, except for individual Microalloy Elements, generally represent a few percent.
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