Preparation method of low-cost sulfuric-acid-corrosion-resistant 09CrCuSbRE hot-rolled round steel

Abstract

The invention discloses a preparation method of low-cost sulfuric-acid-corrosion-resistant 09CrCuSbRE hot-rolled round steel. A steelmaking technological process of the preparation method comprises the steps of converter smelting, external refining, VD vacuum treatment and continuous casting. A steel rolling technological process comprises the steps of casting blank heating, high-pressure water dephosphorization, phi 850 mm cogging mill treatment, phi 700 mm*3+phi 550 mm*4 continuous rolling unit rolling, saw cutting, slow cooling, nondestructive testing, stacking, checking, trimming, bundling, warehousing and delivery. The technical parameters controlled in the rolling process are as follows: the heating temperature is 1150 to 1200 DEG C, and the heat preservation time is more than or equal to 3 hours; the initial rolling temperature is lower than or equal to 1100 DEG C; the final rolling temperature is lower than or equal to 780 DEG C; the slow cooling time is longer than or equal to48 hours; and a rolled tissue is a ferrite and pearlite tissue. Through delivery in a hot-rolled state, a complex heat treatment process is not needed, and a wide process window is realized.

Description

technical field [0001] The invention relates to the technical field of material metallurgy, in particular to a method for preparing a low-cost sulfuric acid corrosion-resistant 09CrCuSbRE hot-rolled round steel. Background technique [0002] At present, the energy problem is becoming more and more serious. With the massive exploitation of fossil energy such as coal and oil, the sulfur content in the fuel is getting higher and higher, which leads to serious corrosion of combustion, heat exchange and other equipment, especially in the heat exchange process. Sulfuric acid dew point corrosion occurs. Such as flue, chimney, desulfurization device, etc. The fuel usually contains 2% to 3% sulfur by mass fraction, and after combustion, SO2 with a volume fraction of about 0.2% is produced in the flue gas, and SO2 with a volume fraction of 1% to 2% is affected by particulate dust, metal oxides, etc. SO3 is generated by the catalysis of the flue gas, and then combined with the moistu...

AI Technical Summary

Problems solved by technology

The content range of C, Cr and Sb in this steel is relatively wide, and it is not easy to control

In addition, due to its high C content, the Ti element content should not be too high, because too high Ti content is easy to precipitate larger carbide and carbonitride particles in the process of solidification and high temperature rolling under the condition of high C content, Not only does it affect the precipitation strengthening effect of Ti, but the large precipitates are also detrimental to toughness, so the alloy design of this patent is not conducive to popularization and use

[0005] The preparation process and chemical composition of the above-mentioned documents are relatively complicated, and the manufacturing cost is relatively high, which is difficult to meet the production needs of large-scale industrial production of sulfuric acid corrosion-resistant steel

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