CN103741036B - A kind of wire rod machine roll is with containing rare earth alloy steel and preparation method thereof - Google Patents

Abstract

A kind of wire rod machine roll is with containing rare earth alloy steel, and the chemical element composition that it contains and mass percent thereof are: carbon 0.8-0.9, tungsten 1.5-2, molybdenum 1.5-2.5, vanadium 1.0-2.0, chromium 3.5-4.5, niobium 0.05-0.10, lanthanum 0.05-0.10, cerium 0.05-0.10, titanium 0.03-0.05, tungsten 0.06-0.08, P≤0.030, S≤0.030, surplus are iron.Steel alloy provided by the invention has the performance of high temperature resistant, red hard height, high temperature-proof cracking, owing to the addition of rare earth element, makes steel alloy rigidity high, fatigue resistance is good, and surface abrasion resistance is good, and resistance to flaking is good, be suitable for making support roll, because alloying element is lower, cost is lower.Refining agent of the present invention is used for Foundry Production, and significantly improve yield rate, can not produce pore at cast(ing) surface, trapped oxide also obviously reduces.

Description

A kind of wire rod machine roll is with containing rare earth alloy steel and preparation method thereof

Technical field

The present invention relates to roll technology field, particularly relating to a kind of wire rod machine roll with containing rare earth alloy steel and preparation method thereof.

Background technology

Roll is the central module of wire rod machine, carries out gadolinium processing to gadolinium part, makes metal produce the main tool of viscous deformation.Roll working load is large, bears very large gadolinium pressing pressure and torsional moment, and has very strong shock load and very large mass force; In addition, the Working environment of roll is harsh, bear very high temperature, have water coolant again, is in the cold and hot lower work that accompanies each other, serious wear.

High carbon and chromium cast steel, the several types such as ordinary steel and Wimet.High carbon and chromium cast steel is owing to there being certain wear resistance, and low price, is therefore widely used, and the material that high carbon and chromium running roller steel is conventional has 13Cr13WMoV and 18Cr20WMoV.Because these two kinds of steel hardness and wear resistance mainly rely on the carbide Cr of chromium ₇c ₃and Cr ₂₃c ₆, thermostability is poor, generally more than 450 DEG C, starts agglomeration and softens gradually.550 DEG C time, hardness will be down to below HRC50.And the temperature of wire rod running roller under running can reach about 550 DEG C, this just makes running roller obviously reduce work-ing life.The secondary hardening temperature of ordinary steel is at about 550 DEG C, and hardness maintains HRC62 ~ 64, can improve the work-ing life of running roller significantly; Wimet also has good hot hardness and wear resistance.But because the manufacturing cost of ordinary steel and Wimet is too high, the use of high line running roller material is restricted.Therefore study excellent performance, the roll material that cost is cheaper just seems particularly important.

Summary of the invention

The object of the present invention is to provide a kind of wire rod machine roll with containing rare earth alloy steel and preparation method thereof, this alloy material has good, the good heat crack resistance of wear resistance, resistant to elevated temperatures advantage.

Technical scheme of the present invention is as follows:

A kind of wire rod machine roll, with containing rare earth alloy steel, is characterized in that: the chemical element composition that it contains and mass percent thereof are: carbon 0.8-0.9, tungsten 1.5-2, molybdenum 1.5-2.5, vanadium 1.0-2.0, chromium 3.5-4.5, niobium 0.05-0.10, lanthanum 0.05-0.10, cerium 0.05-0.10, titanium 0.03-0.05, tungsten 0.06-0.08, P≤0.030, S≤0.030, surplus are iron.

The production method of described wire rod machine roll containing rare earth alloy steel, is characterized in that:

(1), the preparation pig iron and scrap iron are originated as ferrous substrate in 1:0.5-1.5 ratio, the pig iron is added drop in stove and melt, carry out desulfurization, deoxidation, employing refining agent initial refining, add alloying constituent and carry out alloying, then add scrap iron fusing, add refining agent secondary refining, detection adjust chemical element component content to qualified, casting, casting postheat treatment etc.;

(2) lot sequence, dropping into alloying element in alloying process in stove is: (1) vanadium, chromium, cerium; (2) tungsten, niobium, lanthanum; (3) other remaining components; The each batch of timed interval of dropping into element is 22-25 minute, stirs after feeding intake.

Described casting postheat treatment is: first by room temperature with 200-210 DEG C/h of ramp to 670-680 DEG C, insulation 40-50 minute, then with 220-230 DEG C/h of ramp to 930-940 DEG C, insulation 4-5 hour; 670-680 DEG C is cooled to again, insulation 50-60 minute with 170-180 DEG C/h of speed; 220-230 DEG C is cooled to again, insulation 3-4 hour with 180-190 DEG C/h of speed; Again with 100-110 DEG C/h of ramp to 330-350 DEG C, insulation 40-50 minute, then with 100-110 DEG C/h of ramp to 540-550 DEG C, insulation 3-4 hour, takes out air cooling and get final product.

Described refining agent is made up of the raw material of following weight part: instrument comminuted steel shot 3-5, clay 10-12, Sodium Silicofluoride 3-4, sodium carbonate 2-3, sodium tetraborate 1-2, stalk ashes 4-5, potassium felspar sand 36-40, jade powder 3-4, carclazyte 6-8, ground dolomite 3-4; Each raw material mixes by preparation method, is heated to 2600-2900 DEG C to molten state, stirs 10-15 minute, is poured into Quench in pure water, then is ground into 100-200 order powder, washes with water for several times, dries and get final product.

Beneficial effect of the present invention

Steel alloy provided by the invention has the performance of high temperature resistant, red hard height, high temperature-proof cracking, owing to the addition of rare earth element, makes steel alloy rigidity high, fatigue resistance is good, and surface abrasion resistance is good, and resistance to flaking is good, be suitable for making support roll, because alloying element is lower, cost is lower.Refining agent of the present invention is used for Foundry Production, significantly improves yield rate, and the degree of porosity particularly in foundry goods reduces 1-2 degree, and can not produce pore at cast(ing) surface, trapped oxide also obviously reduces, and oxide inclusion is at about 2 grades.

Embodiment

A kind of wire rod machine roll is with containing rare earth alloy steel, and the chemical element composition that it contains and mass percent thereof are: carbon 0.8-0.9, tungsten 1.5-2, molybdenum 1.5-2.5, vanadium 1.0-2.0, chromium 3.5-4.5, niobium 0.05-0.10, lanthanum 0.05-0.10, cerium 0.05-0.10, titanium 0.03-0.05, tungsten 0.06-0.08, P≤0.030, S≤0.030, surplus are iron.

Described wire rod machine roll is as follows by the production method containing rare earth alloy steel:

(1), the preparation pig iron and scrap iron are originated as ferrous substrate in 1:1 ratio, the pig iron is added drop in stove and melt, carry out desulfurization, deoxidation, employing refining agent initial refining, add alloying constituent and carry out alloying, then add scrap iron fusing, add refining agent secondary refining, detection adjust chemical element component content to qualified, casting, casting postheat treatment etc.;

(2) lot sequence, dropping into alloying element in alloying process in stove is: (1) vanadium, chromium, cerium; (2) tungsten, niobium, lanthanum; (3) other remaining components; The each batch of timed interval of dropping into element is 23 minutes, stirs after feeding intake.

Described casting postheat treatment is: elder generation with 205 DEG C/h of ramp to 675 DEG C by room temperature, is incubated 45 minutes, then with 225 DEG C/h of ramp to 935 DEG C, is incubated 4.5 hours; Be cooled to 675 DEG C with 175 DEG C/h of speed again, be incubated 55 minutes; Be cooled to 225 DEG C with 185 DEG C/h of speed again, be incubated 3.5 hours; Again with 105 DEG C/h of ramp to 340 DEG C, be incubated 45 minutes, then with 105 DEG C/h of ramp to 545 DEG C, be incubated 3.5 hours, take out air cooling and get final product.

Described refining agent is made up of the raw material of following weight part (kilogram): described refining agent is made up of the raw material of following weight part (kilogram): instrument comminuted steel shot 3, clay 10, Sodium Silicofluoride 4, sodium carbonate 2, sodium tetraborate 1, stalk ashes 4, potassium felspar sand 36, jade powder 3, carclazyte 6, ground dolomite 3; Each raw material mixes by preparation method, is heated to 2600-2900 DEG C to molten state, stirs 10-15 minute, is poured into Quench in pure water, then is ground into 100-200 order powder, washes with water for several times, dries and get final product.

The mechanical property of wire rod machine roll of the present invention containing rare earth alloy steel is: tensile strength 1280MPa, yield strength 925MPa, unit elongation 14%, relative reduction in area 30%, impact absorbing energy 61J, impelling strength 62J/cm2, hardness 288HB.

Claims (1)

1. wire rod machine roll is with containing the production method of rare earth alloy steel, it is characterized in that: described wire rod machine roll with containing the chemical element composition of rare earth alloy steel and mass percent thereof is: carbon 0.8-0.9, tungsten 1.5-2, molybdenum 1.5-2.5, vanadium 1.0-2.0, chromium 3.5-4.5, niobium 0.05-0.10, lanthanum 0.05-0.10, cerium 0.05-0.10, titanium 0.03-0.05, tungsten 0.06-0.08, P≤0.030, S≤0.030, surplus are iron;

This production method is:

(1), the preparation pig iron and scrap iron are originated as ferrous substrate in 1:0.5-1.5 ratio, the pig iron is added drop in stove and melt, carry out desulfurization, deoxidation, employing refining agent initial refining, add alloying constituent carry out alloying, then add scrap iron fusing, add refining agent secondary refining, detection and adjust chemical element component content to qualified, casting, casting postheat treatment;

(2) lot sequence, dropping into alloying element in alloying process in stove is: (1) vanadium, chromium, cerium; (2) tungsten, niobium, lanthanum; (3) other remaining components; The each batch of timed interval of dropping into element is 22-25 minute, stirs after feeding intake;

Described casting postheat treatment is: first by room temperature with 200-210 DEG C/h of ramp to 670-680 DEG C, insulation 40-50 minute, then with 220-230 DEG C/h of ramp to 930-940 DEG C, insulation 4-5 hour; 670-680 DEG C is cooled to again, insulation 50-60 minute with 170-180 DEG C/h of speed; 220-230 DEG C is cooled to again, insulation 3-4 hour with 180-190 DEG C/h of speed; Again with 100-110 DEG C/h of ramp to 330-350 DEG C, insulation 40-50 minute, then with 100-110 DEG C/h of ramp to 540-550 DEG C, insulation 3-4 hour, takes out air cooling and get final product;

Described refining agent is made up of the raw material of following weight part: instrument comminuted steel shot 3-5, clay 10-12, Sodium Silicofluoride 3-4, sodium carbonate 2-3, sodium tetraborate 1-2, stalk ashes 4-5, potassium felspar sand 36-40, jade powder 3-4, carclazyte 6-8, ground dolomite 3-4; Each raw material mixes by preparation method, is heated to 2600-2900 DEG C to molten state, stirs 10-15 minute, is poured into Quench in pure water, then is ground into 100-200 order powder, washes with water for several times, dries and get final product.