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Information Name: | Supply of manganese steel AISI1074 spring steel SPS9 spring steel imports |
Published: | 2012-03-15 |
Validity: | 30 |
Specifications: | Complete |
Quantity: | 1.00 |
Price Description: | |
Detailed Product Description: | 1 Heat treatment Require a higher strength spring steel and the fatigue limit, usually in the quenching + tempering temperature of the state to use in order to obtain a higher elastic limit. Heat treatment technology inherent quality of the spring has a critical influence. Therefore, how to further improve the fatigue life of spring, require further study, particularly in the chemical surface modification of heat treatment, shot peening fatigue life of spring and so have an important impact. To further strengthen the surface of the valve spring strength, increased stress, increased fatigue life, valve spring after forming, to further after nitriding, cryogenic liquid carbonitriding or diltiazem permeation process, and then by shot peening. For example, Japan will f4mm the si-cr oil quenched steel after 450 ℃ × 4.5h carbonitriding and body temperature after 400 ℃ × 15min in the tempering temperature to compare the fatigue limit can be increased 240mpa. Nitrogen into not only eliminates the adverse effects of decarburization, but also improve the residual stress, and by the low-temperature liquid nitriding and carbonitriding of high-strength valve spring increase, 150 ℃ when the deformation of 0.2% (requirement value of 0.5%), 250 ℃ deformation of 0.56%, to improve the thermal stability of the valve springs and anti-relaxation stability, but the liquid nitriding and carbonitriding time should be strictly controlled, otherwise it will form a network sulfide and mesh nitride, but will reduce its fatigue strength. Way to improve strength valve spring can also choose to shot peening, the surface of the valve spring production practice Shot There are two pills, a diameter of 0.8mm, the microhardness 720hv0.2, another diameter 0.25mm, the microhardness 800hv0.2, three blasting can be enhanced to achieve better results, but also make the surface quality is improved. 2. Alloying Carbon is the main strengthening element in steel, spring steel on the impact of often more than other alloying elements. According to requirements, spring steel material should be in the high-carbon steel. Widely used in today's world of spring steel, carbon content of most of the 0.45% to 0.65%. In order to overcome the spring steel strength was raised to reduce the problem of toughness and ductility, but also reduce the carbon content of the trend. China's low-carbon martensitic steel spring conducted in-depth research, such as 28mnsib, 35mnsib, with its carbon content of 0.30 percent. Practice shows that the spring steel in the tempering of lath martensite is used, adequate strength and good mechanical properties, especially ductility, toughness is excellent. Japanese research and development of several high-strength spring steel, such as uhs1900, vhs2000, nd120s, nd250s, etc., carbon content of 0.40 percent. Spring steel alloy elements in the main role is to improve the mechanical properties, improved process performance and to give some special properties (such as high temperature, corrosion), etc. A lot of spring steel with silicon as the main alloying elements, it is a play by the greatest impact resistance of the alloy elements, mainly because silicon has a strong solid solution strengthening effect; the same time, silicon can inhibit the process of cementite in tempered crystal nuclear formation and growth, changes in precipitation of carbides at tempering the number, size and shape, to improve the stability of steel tempering. At present, domestic steel grades in wsi 1.8% to 2.2%, the highest existing standard silicon spring steel. However, if the silicon content is too high, will promote the rolling and heat treatment of steel in the process of decarbonization and the tendency of graphite, and the smelting of difficult and easy to form inclusions, therefore, high silicon content spring steel still use caution. Because chromium can significantly improve the hardenability of steel, to prevent si-cr steel ball of annealing the graphite tendency to reduce the decarburization, the spring steel is commonly used alloying elements in order to strengthen the elements of chromium as the main spring steel 50crv wider use. Manganese is to improve the hardenability of the most effective alloying elements, which dissolve in the ferrite solid solution of of role. Studies have shown that, wmn must be greater than 0.5%, so that when spring steel hardened heart completely over into the Department of martensite, but wmn more than 1.5%, the toughness decreased significantly, which in the choice of spring steel should be a priority. Mo can improve the hardenability of steel, to prevent temper brittleness, improved fatigue properties, plus the existing standard few molybdenum spring steel, adding content is generally below 0.4%. Vanadium is a strong carbide forming elements, the precipitation of small solid-state diffusion under the mc carbide has a strong precipitation strengthening effect. Added steel in 35crmnb 0.11% v, can significantly improve the hardenability of steel, also found that can effectively reduce 35simnb vanadium steel decarburization sensitivity that this is the effective solution of vanadium to reduce the carbon steel to prevent grain growth and prevent grain boundary diffusion and increase the oxidation resistance. |
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You are the 100202 visitor
Copyright © GuangDong ICP No. 10089450, Yao Tai Metal line All rights reserved.
Technical support: ShenZhen AllWays Technology Development Co., Ltd.
AllSources Network's Disclaimer: The legitimacy of the enterprise information does not undertake any guarantee responsibility