CN1360068A - Process for producing low-Ti high-C ferrochronium - Google Patents

Abstract

A low-Ti high-C ferrochromium is prepared from chromium ore (Cr2O3 greater than 40%, Cr/Fe greater than 1.8, (MgO+CaO)Al2O3=1-1.6, and Ti less than 0.1%, coke (fixed coke greater than 82%, ash less than 15%, P less than 0.025%, and Ti less than 0.15%), and silica (SiO2 greater than 97% and Al2O3 less than 1.5%) through proportional mixing and smelting at 1600-1800 deg.c while controlling components of slags (MgO 32-38%, SiO2 28-32% and Al2O3 22-27%) and supplementing coke and magnesium substance. Its advantages are low Ti content less than 0.03% and high strength and antiwear performance.

Description

Process for producing low-Ti high-C ferrochronium

Technical field.

The present invention relates to a kind of smelting process for production of low titanium carbon chromium.

Background technology.

At present, low titanium carbon chromium is mainly as the steel-making additive of special steel grade, as bearing steel etc.Before this product invention, owing to lack the low titanium additives of high-quality, aspects such as the intensity of China's bearing and wear resistance exist obvious defects.

Summary of the invention.

The object of the present invention is to provide a kind of production technique of low-Ti high-C ferrochronium.

The objective of the invention is to realize: a kind of production technique of low-Ti high-C ferrochronium by following approach:

Get chrome ore: Cr ₂O ₃〉=40%, Cr/Fe 〉=1.8, (MgO+CaO) Al ₂O ₃=1-1.6, Ti≤0.10%, granularity 40mm;

Coke: fixed carbon 〉=82%, ash content≤15%, P≤0.025%, Ti≤0.15%, granularity 6-18mm;

Silica: SiO ₂〉=97%, Al ₂O ₃≤ 1.5%, washing inclusion-free, granularity 20-40mm;

Above-mentioned raw materials mixed to put in the stove smelts, in the stove temperature between 1600-1800, control slag ternary slag type MgO32-38% in smelting process, SiO ₂28-32%, Al ₂O ₃22-27% in time replenishes furnace charge in smelting process, especially at regularly additional coke in iron notch zone and magnesian.

The present invention contains Ti≤0.03%, satisfied the requirement to this class feature kind, by on probation, wear resistance and the intensity of making the special steel of Additive Production with the present invention all are met, market outlook are good, will make the quality of China's special steel steel obtain big breakthrough.

Embodiment.

As shown in Figure 1; A kind of process for producing low-Ti high-C ferrochronium:

Chrome ore: Cr ₂O ₃〉=40%, Cr/Fe 〉=1.8, (MgO+CaO) Al ₂O ₃=1-1.6, Ti≤0.10%, granularity 40mm;

Coke: fixed carbon 〉=82%, ash content≤15%, P≤0.025%, Ti≤0.15%, granularity 6-18mm;

Silica: SiO ₂〉=97%, Al ₂O ₃≤ 1.5%, washing inclusion-free, granularity 20-40mm;

Above-mentioned raw materials mixed to put in the stove smelts, in the stove temperature between 1600-1800, control slag ternary slag type MgO32-38% in smelting process, SiO ₂28-32%, Al ₂O ₃22-27% in time replenishes furnace charge in smelting process, especially at regularly additional coke in iron notch zone and magnesian.

Claims (1)

1, a kind of process for producing low-Ti high-C ferrochronium is characterized in that:

Chrome ore: Cr ₂O ₃〉=40%, Cr/Fe 〉=1.8, (MgO+CaO) Al ₂O ₃=1-1.6, Ti≤0.10%, granularity 40mm;

Coke: fixed carbon 〉=82%, ash content≤15%, P≤0.025%, Ti≤0.15%, granularity 6-18mm;

Silica: SiO ₂〉=97%, Al ₂O ₃≤ 1.5%, washing inclusion-free, granularity 20-40mm;

Above-mentioned raw materials mixed to put in the stove smelts, in the stove temperature between 1600-1800, control slag ternary slag type MgO32-38% in smelting process, SiO ₂28-32%, Al ₂O ₃22-27% in time replenishes furnace charge in smelting process, especially at regularly additional coke in iron notch zone and magnesian.