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ZG35Cr24Ni7SiN Heat-resistant steel castings
ZG35Cr24Ni7SiN The chemical composition is: C: 0.30~0.40, Si: 1.30~2.00, Mn: 0.80~1.50, S: 0.03, P: 0.04, Cr: 23-25.5, Ni: 7.00~8.50, N: 0.20~0.28
ZG35Cr24Ni7SiN Products are: quenching furnace, well furnace, bell cover furnace, degenerative furnace, box furnace bottom plate, annealing box, heat treatment material basket, heat resistant steel plate, hanging basket, material frame, furnace chassis, output shaft frame, well furnace hanger, heat treatment furnace blade, impeller, vacuum furnace material plate, vacuum heat treatment furnace material basket
ZG35Cr24Ni7SiN Standard: GB 8492-87 characteristics and scope of application: the highest use temperature is 1100℃, high high temperature strength, good oxidation resistance.
ZG35Cr24Ni7SiN Refining process, process contains the molten steel package preparation electric arc furnace at the beginning of the package refining + package blowing ammonia gas, the use of the rich resources and cheap ammonia gas as raw materials, through the steel blow ammonia alloying, can greatly reduce the production cost of ammonia steel, through reasonable process to improve alloy recovery, solve the problem of chemical composition is not easy to control, improve the quality of molten steel metallurgy.
ZG35Cr24Ni7SiN The lower limit of nickel component 7.00% and the lower limit of chromium composition 23.00% calculate the amount of nickel and chromium respectively, Add nickel plate and ferrochrome and ferrochrome nitrogen (add ferrochromium nitrogen at 0.3%), And add ferrochromium and ferronitride, Before adding iron nitride, the nitrogen at the bottom shall be replaced in advance, Nitrogen gas pressure of 2.5~3.5kg, Flow rate, ranging from 45 to 65 L/min, Ferrochrome has to be added in three to four batches, Make sure the first ferrochrome melts completely before joining the latter batch, After up to 70%, Sampling for the full analysis, Adjust the addition amount of alloy elements to the specifications according to the sampling results;
ZG35Cr24Ni7SiN The smelting of nitrogen-containing high-alloy heat-resistant steel casting in the past was the smelting of electric arc furnace smelting, smelting, oxidation, reduction three stages, The smelting method has the following defects: (1), nitrogen alloying is generally in the smelting period of adding hydrogenation alloy (such as nitrogen iron, nitric iron nitride) to achieve the nitrogen iron, manganese nitride general impurity content is high, Polluted steel liquid; (2) Due to the low yield of nitrogen when the hydrogenated alloy is expensive, The cost of smelting alloys is very high; (3) Chemical composition is difficult to control, Easy to cause carbon, nitrogen and other components out of line; (4) Large demand for chromium alloy and unstable recovery rate is easy to cause waste; (5), melting and oxidation process blowing into a lot of oxygen resulting in high oxygen content of molten steel, High inclusion and gas content of the casting surface is easy to produce high stoma waste rate; (6) High water viscosity of molten steel, Not easy to pour.
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