Low-phosphorus smelting process for martensitic stainless steel main shaft

Abstract

The invention relates to a martensitic stainless steel smelting process for a main shaft used on an esterification reactor. The smelting process adopts a smelting method of electric furnace+inductionfurnace smelting-LF steel ladle refining-vacuum refining and comprises the following steps that high-phosphorus-content molybdenum iron alloy and a nickel plate are loaded into a furnace along with furnace materials, and the phosphorus content brought in steel by the molybdenum iron alloy is removed through dephosphorization reaction in the electric furnace smelting process after melting; low-phosphorus alloy steel material heads are selected and are mixed into a steel ladle together with chromium iron alloy after being melted utilizing an induction furnace, and the low phosphorus content is guaranteed to obtain; and the vacuum refining is performed after electric furnace and induction furnace primary smelting liquid steel is mixed into the steel ladle, and steel ingot pouring is performedafter the temperature and the composition are adjusted to be qualified. By means of the low-phosphorus smelting process for a martensitic stainless steel main shaft, the produced liquid steel can remove the phosphorus content brought in the steel by the high-phosphorus alloy sufficiently, and a good precondition is created for obtaining of the final low-phosphorus liquid steel; an electric furnace and the induction furnace smelt the primary smelting liquid steel simultaneously, the smelting cycle can be shortened, and the production efficiency is improved; and the composition uniformity can be improved, local high phosphorus caused by component segregation is reduced, and expectation of the low-phosphorus liquid steel is obtained.

Description

technical field [0001] The invention relates to a martensitic stainless steel smelting process for the main shaft used in an esterification reactor. Using this low-phosphorus smelting process, the DIN1.4122 main shaft can obtain a relatively low phosphorus content, and at the same time, the composition is uniform to prevent composition segregation from causing The low-phosphorus smelting process of the martensitic stainless steel spindle with high local phosphorus content. Background technique [0002] The esterification reactor adopts the martensitic stainless steel DIN1.4122 main shaft used in the field of chemical machinery. It is the main load-bearing part in the reactor. It loads all the stirring plates and bears impact and strain loads at the same time, which requires high quality materials. DIN1.4122 is a German stainless steel grade, which is a medium-carbon high-alloy steel. The main element content is 0.33%~0.43%C, 15%~17%Cr, 0.8%~1.3%Mo, ≤1%Mn, ≤1%Ni, ≤1%Si, ≤0.0...

AI Technical Summary

Problems solved by technology

DIN1.4122 is a German stainless steel grade, which is a medium-carbon high-alloy steel. The main element content is 0.33%~0.43%C, 15%~17%Cr, 0.8%~1.3%Mo, ≤1%Mn, ≤1%Ni, ≤1%Si, ≤0.040%P, ≤0.015%S, high alloy content, long smelting cycle, in order to control production cycle and cost, most iron and steel enterprises mainly adopt non-vacuum induction furnace-electroslag remelting smelting production mode, the The induction furnace in the smelting method has no dephosphorization function, and the process is short. The molten steel has not been fully refined and degassed. Furnace raw materials, so this smelting method has a strong dependence on raw materials, and the production capacity is limited