CN103741044B

CN103741044B - A kind of Hot roll alloy steel material and preparation method thereof

Info

Publication number: CN103741044B
Application number: CN201310701445.8A
Authority: CN
Inventors: 何玉平; 陶国斌; 史承海; 晏绍斌; 屠明安
Original assignee: MAANSHAN FANGYUAN MATERIAL PROJECT CO Ltd
Current assignee: MAANSHAN Fangyuan Material Engineering Co.,Ltd.
Priority date: 2013-12-19
Filing date: 2013-12-19
Publication date: 2015-12-09
Anticipated expiration: 2033-12-19
Also published as: CN103741044A

Abstract

A kind of Hot roll alloy steel material, the chemical element composition that it contains and mass percent thereof are: carbon 0.8-0.9, tungsten 2.5-3, molybdenum 0.25-0.5, vanadium 0.35-0.5, chromium 3.0-3.5, niobium 0.05-0.10, holmium 0.05-0.10, erbium 0.05-0.10, Mn0.2-0.3, Ti0.5-0.8, B0.2-0.4, P≤0.030, S≤0.030, surplus are iron.Steel alloy provided by the invention not only has high hardness, also has good toughness, and wear resisting property is good, the strong height of heat, contact fatigue strength are high, the feature that fracture toughness property is high.Steel alloy of the present invention is applicable to hot roll, meets the demand of hot continuous rolling technology, reduces roll change frequency in rolling, increases substantially the operating rate of milling train, reduces production cost, increases economic efficiency.

Description

A kind of Hot roll alloy steel material and preparation method thereof

Technical field

The present invention relates to field of metal preparation, particularly relate to a kind of Hot roll alloy steel material and preparation method thereof.

Background technology

The environment of pump valve work is various, badly, very high to the requirement of material, the steel alloy of current pump valve has varied, technology has very much progress, but still have a lot of problem to exist, as wear resistance, hardness, rustless property, corrosion resistance nature, high and low temperature resistance, fragility, toughness etc., the requirement of production can't be met in a lot of occasion, also require further improvement, to enhance productivity, reduce costs, improve security, for high-quality precision and sophisticated technology development provides safeguard, for social development provides power, task is also very arduous.

Summary of the invention

The object of the present invention is to provide a kind of Hot roll alloy steel material and preparation method thereof, this alloy material has high rigidity, heat shock resistance, wear-resisting advantage.

Technical scheme of the present invention is as follows:

A kind of Hot roll alloy steel material, is characterized in that: the chemical element composition that it contains and mass percent thereof are: carbon 0.8-0.9, tungsten 2.5-3, molybdenum 0.25-0.5, vanadium 0.35-0.5, chromium 3.0-3.5, niobium 0.05-0.10, holmium 0.05-0.10, erbium 0.05-0.10, Mn0.2-0.3, Ti0.5-0.8, B0.2-0.4, P≤0.030, S≤0.030, surplus are iron.

The production method of described Hot roll alloy steel material, 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) chromium, Mn, B; (2) molybdenum, niobium, holmium; (3) tungsten, erbium; (4) other remaining components; The each batch of timed interval of dropping into element is 20-23 minute, stirs after feeding intake.

Described casting postheat treatment is: first by room temperature with 160-170 DEG C/h of ramp to 750-760 DEG C, insulation 40-50 minute, then with 160-170 DEG C/h of ramp to 910-920 DEG C, insulation 4-5 hour; Be cooled to 600-610 DEG C with 150-160 DEG C/h of speed again, insulation 40-50 minute, then be cooled to 490-500 DEG C with 150-160 DEG C/h of speed, insulation 40-50 minute, then be cooled to 200-210 DEG C with 150-160 DEG C/h of speed, insulation 2-3 hour; 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 500-510 DEG C, insulation 2-3 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, loess 30-40, magnesium oxide 1-2, SODIUMNITRATE 4-5, titanium dioxide 2-3, bauxitic clay 5-7, sepiolite powder 2-3, jade powder 3-4, stalk ashes 4-6, diatomite 1-2; 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 not only has high hardness, also has good toughness, and wear resisting property is good, the strong height of heat, contact fatigue strength are high, the feature that fracture toughness property is high.Steel alloy of the present invention is applicable to hot roll, meets the demand of hot continuous rolling technology, reduces roll change frequency in rolling, increases substantially the operating rate of milling train, reduces production cost, increases economic efficiency.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 Hot roll alloy steel material, the chemical element composition that it contains and mass percent thereof are: carbon 0.8-0.9, tungsten 2.5-3, molybdenum 0.25-0.5, vanadium 0.35-0.5, chromium 3.0-3.5, niobium 0.05-0.10, holmium 0.05-0.10, erbium 0.05-0.10, Mn0.2-0.3, Ti0.5-0.8, B0.2-0.4, P≤0.030, S≤0.030, surplus are iron.

The production method of described Hot roll alloy steel material is as follows:

(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) chromium, Mn, B; (2) molybdenum, niobium, holmium; (3) tungsten, erbium; (4) other remaining components; The each batch of timed interval of dropping into element is 21 minutes, stirs after feeding intake.

Described casting postheat treatment is: elder generation with 165 DEG C/h of ramp to 755 DEG C by room temperature, is incubated 45 minutes, then with 165 DEG C/h of ramp to 915 DEG C, is incubated 4.5 hours; Be cooled to 605 DEG C with 155 DEG C/h of speed again, be incubated 45 minutes, then be cooled to 495 DEG C with 155 DEG C/h of speed, be incubated 45 minutes, then be cooled to 205 DEG C with 155 DEG C/h of speed, be incubated 2.5 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 505 DEG C, be incubated 2.5 hours, take out air cooling and get final product.

Described refining agent is made up of the raw material of following weight part (kilogram): instrument comminuted steel shot 5, loess 30, magnesium oxide 1, SODIUMNITRATE 4, titanium dioxide 2, bauxitic clay 7, sepiolite powder 2, jade powder 4, stalk ashes 6, diatomite 1; 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 Hot roll alloy steel material of the present invention is: tensile strength 1143MPa, yield strength 879MPa, unit elongation 15.8%, relative reduction in area 36%, impact absorbing energy 52J, impelling strength 65J/cm2, hardness 290HB.

Claims

1. a Hot roll alloy steel material, is characterized in that: the chemical element composition that it contains and mass percent thereof are: carbon 0.8-0.9, tungsten 2.5-3, molybdenum 0.25-0.5, vanadium 0.35-0.5, chromium 3.0-3.5, niobium 0.05-0.10, holmium 0.05-0.10, erbium 0.05-0.10, Mn0.2-0.3, Ti0.5-0.8, B0.2-0.4, P≤0.030, S≤0.030, surplus are iron;

The production method of described Hot roll alloy steel material,

(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) chromium, Mn, B; (2) molybdenum, niobium, holmium; (3) tungsten, erbium; (4) other remaining components; The each batch of timed interval of dropping into element is 20-23 minute, stirs after feeding intake;

Described casting postheat treatment is: first by room temperature with 160-170 DEG C/h of ramp to 750-760 DEG C, insulation 40-50 minute, then with 160-170 DEG C/h of ramp to 910-920 DEG C, insulation 4-5 hour; Be cooled to 600-610 DEG C with 150-160 DEG C/h of speed again, insulation 40-50 minute, then be cooled to 490-500 DEG C with 150-160 DEG C/h of speed, insulation 40-50 minute, then be cooled to 200-210 DEG C with 150-160 DEG C/h of speed, insulation 2-3 hour; 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 500-510 DEG C, insulation 2-3 hour, takes out air cooling and get final product;