Baosteel 65mn spring steel stamping spring steel spring steel spring steel spring steel ..

Spring steel according to production methods can be divided into hot-rolled and cold-drawn spring steel (rolled) spring steel. Hot rolled spring steel coil spring ﹑ including manufacturing torsion bar with round or trapezoidal steel and manufacturing of flat leaf spring; cold drawn (rolled) spring steel including making small size of the coil spring cold drawn steel wire and manufacturing and a variety of spring cold-rolled steel leaf spring. Manganese alloy spring steel usually ﹑ ﹑ ﹑ chromium molybdenum tungsten ﹑ ﹑ vanadium and boron trace amounts of silicon, these alloying elements can improve the steel hardenability, manganese and silicon solid dissolved in ferrite, can increase the yield strength. Chrome vanadium ﹑ ﹑ tungsten can improve the elastic limit steel ﹑ yield ratio and heat resistance. Press the alloying elements commonly used spring steel can be divided into the following: ??? low carbon spring steel prices, and versatile. And heat treating the same surface as the state organization, the fatigue limit is not lower than alloy spring steel. The disadvantage is that the yield is low hardenability and strength; large cross-section of the spring, not when oil quenching hardenability, easy to crack when water quenching. As the carbon content increases, although able to improve the strength and elastic limit, but it will reduce the impact toughness and ductility, especially lower temperature toughness. China's carbon spring steel have 65﹑70﹑75﹑85 four steel. ???? Pure manganese as spring steel 65Mn, the manganese content is 0.90 to 1.20%. Increasing the manganese content improves hardenability and strength of steel, reducing decarbonization tendencies; drawback is overheating sensitivity and temper brittleness, and easy to produce quenching cracks, so only suitable for the manufacture of various small-sized flat spring ﹑ round spring . ???? Silico-manganese spring steel is a major hot-rolled alloy spring steel, China has 55Si2Mn 60Si2Mn ﹑ ﹑ ﹑ 70Si3MnA 60Si2MnA four steel. A silicon content of 1.50 to 2.80%, a manganese content of 0.60 to 0.90%. Plus silicon steel can significantly increase the elastic limit and yield ratio, improve the tempering stability; it is easy to form silicate inclusions increase decarbonization sensitivity. When the carbon content in steel and silicon are high, easy-graphitizable carbon. Such steel is widely used in the production of damping spring and coil spring automobile, tractor ﹑ locomotive, as well as requirements to withstand high stress spring. ??? Chromium spring steel is very common in the international arena, China has 50CrMn and 50CrVA two steel. 50CrMn because it contains about 1% of chromium and manganese, have high hardenability, small decarbonization tendencies; the disadvantage is the tendency of chromium and manganese are worse temper brittleness, need fast cooling after tempering, more for the manufacture of large cross-section and more important spring and coil springs. 50CrVA steel has good hardenability; plus vanadium can refine organized, easy to overheat, and can increase the strength ﹑ toughness, reduced notch sensitivity. This steel decarburization tendency of small, low temperature impact toughness, work at higher temperatures, the performance is more stable, mainly for the manufacture of the valve spring ﹑ valve spring and spring to work at higher temperatures. Appropriate increase in other alloying elements on the basis of 50CrVA steel, can achieve more than grades are shown in Table 6-4 of the two spring steel and better mechanical properties and hardenability common alloy spring steel, chemical composition, heat treatment, mechanical properties and uses . Common alloy spring steel have 60Si2Mn, 50CrVA, 30W4Cr2VA like. 60Si2Mn steel is the most widely used alloy spring steel, which produce about 80 percent alloy spring steel output. Its strength, hardenability, tempering resistance than the high carbon spring steel, operating temperature up to 250 ℃, the disadvantage is a greater tendency to decarburization, suitable for manufacturing leaf springs and cross-sectional dimensions smaller than the thickness of less than 25mm, 10mm screw spring, the heavy machinery, railway vehicles, cars, tractors have a wide range of applications. 50CrVA mechanical properties of steel and steel 60Si2Mn similar, but higher hardenability, Cr and V in steel can improve the elastic limit, strength, toughness and resistance to tempering, commonly used in the production of heavy load, high temperature and cross-sectional dimensions larger spring. 30W4Cr2VA heat-resistant high-strength spring, the main valve spring for boilers below 500 ℃ work, the turbine steam seal spring. ?? The above information is provided by the Dongguan City, Jia Wang contact Metal Materials Co.; Lin Tel 13712969796; 0769-81629576 or 81629676