Production technique of lead treated steel

Abstract

The invention belongs to the field of metallurgy, and provides a production process of free-cutting steel containing lead, comprising a smelting process, a lead adding process and a continuous casting process; in the smelting process, the baking temperature of molten steel tundish is 1000-1150 DEG C; the sulfur content in the molten steel is 0.28-0.33%; the manganese content in the molten steel is 1.2-1.25%; in the lead adding process, inert gas is blown through the bottom of the steel ladle so as to carry out the mixing; lead grains are uniformly added into the steel ladle from above the steel ladle at low speed; the inert gas is blown on the lead-added conduit; in the continuous casting process, the pulling speed of the continuous casting ingot is 1.8-2.4m/min; the continuous casting adopts a method of full-protection casting; a long-gate argon-sealed protection method is adopted from the steel ladle to the tundish; an immersion typed gate protection casting method is used from the tundish to a crystallizer; the over-heat temperature of the tundish of the first furnace for continuous cast starting is 35-45 DEG C; the over-heat temperature of the tundish of normal furnace is 25-35 DEG C. The production process has the advantages of low production cost, easy control of operation and the like; the production method has successful continuous casting pouring and good surface quality of the plate slab.

Description

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AI Technical Summary

Benefits of technology

This technology controls the contents of manganoid (Mn) and sulfide (S), resulting in more desirable properties for steels used in various industries such as construction or transportation vehicles. These benefits include reducing impurity levels during melts while maintaining good mechanical strength without increasing their risk of failure due to cracks formed when they break down under heavy loads over time. Additionally, this method allows for easier manufacturing processes that improve productivity at lower costs compared to traditional methods like blast furnaces.

Problems solved by technology

This patents discuss different methods that can help prevent unwanted oxide formation when making lead-free free-cuttings from iron sources like copper (Cu). These processes involve removing impurities with acidic solutions called acids while still allowing some metals present within them to dissolve into solution. However, there may exist issues related to controlling these factors accurately without causing harmful side effects over time.