It has a remarkable improvement in hardenability and strength. It is an advanced spring mainly used for leaf springs and coil springs that work under extremely important and heavy loads. Disadvantages: Due to its hardness, strength and elasticity, the coiled spring should be heated immediately to eliminate residual stress and prevent cracking.

50C four A carbon is low, at the same strength, higher plasticity, good fatigue performance, hardenability better than 60SiZMn, 5CrMn, 60G material n, etc., mainly used for valve springs. 5SIMnVB features: assisted by 60512 60CrMh, 5CrMn characteristics: good hot workability, good hardenability, good mechanical properties after heat treatment, decarburization tends to be better than SIMn steel. Mainly used for leaf springs, coil springs, etc. with large cross sections. After adding B and M., the hardenability is higher. According to its own technical and technical conditions, Nanjing Iron and Steel Co., Ltd. decided to pre-test 605 MnA bars, and then developed 50CrVA, OA, S S, Cr, 551 shanshan vB (cast slab export) and other varieties. Their process route is: 10 tons UH Wei electric furnace - LF refining furnace VD vacuum furnace five machine five-flow continuous casting cooling furnace rolling cooling fixed length cut a package of people.

The quality of smelting spring steel, especially its performance, is largely determined by the quality of the ingot, the most important being the chemical composition of the steel, the cleanliness of the molten steel (gas, harmful elements, inclusions) and the quality of the slab (component segregation) , macro structure and its surface conditions), these aspects are the key control points of smelting operations.

The cleanliness of spring steel on the cleanliness of molten steel: (1) 0 falls 15PRm, N [60pPm, H [3pPm, (2) residual inclusions are mainly small, uniform, diffuse plastic inclusions. (3) So.oro, P. 0.010. The chemical composition of spring steel has a strict control range, and S, P, O, N, H and residual elements should be as low as possible.

Spring steel control of residual elements: (l) use high-quality scrap steel, large pig iron ratio or iron-to-water ratio, reduce residual N and H in steel materials, and promote non-inclusion floating, which is J fine element. (2) The use of high-purity iron alloys to reduce the optimum conditions for alloying furnaces. The resulting residual elements increase.

Optimize the deoxidation process, using high alkalinity slag and strontium, VD and other control oxygen content and inclusions have important meaning for vacuum steel degassing technology. Add 50t of aluminum and iron before tapping. Studies have shown that when the oxygen content in the steel is less than 15PPtn, the refining time of the furnace should not be less than 30 minutes, the fine-tuning composition, refining can ensure high strength, and the plasticity and toughness are unchanged, and the fatigue process is enhanced to strengthen the deoxidation, desulfurization and agitation operation.

Maintain a full white life. Generally speaking, the fatigue strength increases with the increase of steel hardness. When VD vacuum treatment is not used, the static gas agitation time of Ar gas is not increased linearly. However, when the hardness exceeds soHV for less than 5 minutes, the molten steel is strictly avoided. When guaranteed, the linear relationship between the fatigue performance and the hardness depends on the steel M11 and the S ratio is greater than 50, so that the MnS is divided into inclusions, surface decarburization and surface defects in a fine dispersion.

Therefore, the purpose of the inclusion cloth. After the composition and temperature are fine-tuned to meet the requirements, the presence of Si will reduce the fatigue strength of the steel.

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