Unlock instant, AI-driven research and patent intelligence for your innovation.

Low-cost smelting method for ferrite stainless steel

A smelting method and ferrite technology, which is applied in the field of ferritic stainless steel smelting, can solve the problems of high cost, high dephosphorization cost of molten iron, and long treatment time for dephosphorization of molten iron, so as to reduce production cost and improve furnace feeding conditions Effect

Inactive Publication Date: 2017-09-08
SHANXI TAIGANG STAINLESS STEEL CO LTD
View PDF5 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the dephosphorization time of molten iron is long, the cost of dephosphorization of molten iron is high, the lower the P content in molten iron, the higher the cost, and some P content after dephosphorization of molten iron is ≤0.008%

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Steel Type 430

[0016] Pour the blast furnace molten iron (the first molten iron) in the torpedo tank into the pre-melting bag

[0017] Fold 30t of the first molten iron into the premelting ladle, the ladle number is UE12, the mass percentage of the main elements in the molten iron is: C=4.18%, Si=0.50%, S=0.038%, P=0.063%, and the rest is iron and unavoidable elements at a temperature of 1261°C.

[0018] The intermediate frequency furnace melts high chromium (chromium waste) into a pre-solution, which is folded into the UE12 bag with the first molten iron. The intermediate frequency furnace is equipped with high-carbon ferrochrome 48t for melting. The mass percentage of each main element in high-carbon ferrochrome is: C=7.32%, Cr=50.49%, Si=4.07%, P=0.020%, and the rest are iron and unavoidable elements. After the melt is melted and cleared, the temperature is measured at 1636°C, and the steel is tapped and folded into the UE12 bag.

[0019] After the converter deph...

Embodiment 2

[0023] Steel type 0Cr13R

[0024] Pour the blast furnace molten iron in the torpedo tank into the pre-melting bag

[0025] Fold 28t of the first molten iron into the premelting ladle, the ladle number is UE8, the mass percentages of the main elements in the first molten iron are: C=4.03%, Si=0.38%, S=0.042%, P=0.061%, and the rest For iron and unavoidable elements, the temperature of molten iron is 1257°C.

[0026] The intermediate frequency furnace melts high chromium (chromium waste) into a pre-solution, which is folded into the pre-melting ladle with molten iron

[0027] The intermediate frequency furnace is equipped with 30t of high-carbon ferrochrome and 15t of chrome waste for melting. The mass percentages of the main elements in high-carbon ferrochrome are: C=7.47%, Cr=50.42%, Si=3.98%, P=0.022%, and the rest For iron and unavoidable elements. The mass percentages of the main elements in chromium waste are: C=0.030%, Cr=12.83%, Si=0.31%, P=0.023%, and the rest are ir...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the field of ferritic stainless steel smelting. A low-cost ferritic stainless steel smelting method, pouring the first molten iron with a temperature of 1250-1350°C without dephosphorization into the pre-melting ladle; pouring molten chrome with a temperature of 1630-1650°C Pour into the pre-dissolution bag; pour the dephosphorized second molten iron with a temperature of 1600-1630°C into the pre-dissolution bag; pour all the melt in the pre-dissolution bag into the AOD for blowing, add ferrochrome, Ferrosilicon, electrolytic manganese, lime, and fluorite are smelted until the steel composition requirements are met before tapping, and the tapping temperature is 1610-1650°C. The invention has the beneficial effects of providing a method for smelting ferrite at low cost and reducing production costs.

Description

technical field [0001] The invention relates to the field of ferritic stainless steel smelting. Background technique [0002] At present, the main process of smelting ferritic stainless steel is dephosphorization of molten iron in blast furnace (dephosphorization of molten iron dephosphorization station or converter dephosphorization), then mixing it with AOD (GOR, KOBMS, etc.) for blowing and alloying, as published in the application number 201110184897.4 " A tin-containing ferritic stainless steel and its smelting method", the step is to dephosphorize molten iron and then mix it with KOBMS for smelting. The disadvantage is that the dephosphorization time of hot metal is long, the cost of dephosphorization of hot metal is high, the lower the P content in hot metal, the higher the cost, and some hot metals have P content ≤ 0.008% after dephosphorization. Contents of the invention [0003] The technical problem to be solved by the invention is: how to reduce the dephosphor...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C7/072C21C7/068C22C33/04
CPCC21C7/064C21C7/0685C21C7/072C22C33/006C22C33/04
Inventor 闫志伟赵恕昆陈景锋王鹏谭俊马骏鹏张增武杜晓建
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD