CN103667934B

CN103667934B - A kind of low carbon stainless steel material and preparation method thereof

Info

Publication number: CN103667934B
Application number: CN201310550105.XA
Authority: CN
Inventors: 梅百荣; 徐志勇
Original assignee: TONGLING ANDONG CAST STEEL CO Ltd
Current assignee: TONGLING ANDONG CAST STEEL CO Ltd
Priority date: 2013-11-08
Filing date: 2013-11-08
Publication date: 2016-07-13
Anticipated expiration: 2033-11-08
Also published as: CN103667934A

Abstract

A kind of low carbon stainless steel material, the chemical element component contained and mass percent thereof be: carbon 0.1 0.25, chromium 9.0 9.5, tungsten 0.01 0.03, silicon 0.06 0.1, aluminum 1.3 1.5, molybdenum 2.7 2.8, boron 0.004 0.008, cobalt 0.8 1.1, vanadium 0.03 0.05, titanium 0.006 0.009, P≤0.030, S≤0.030, surplus are ferrum.By the present invention in that and combine with the raw metal such as molybdenum, aluminum, proportioning and production technology are rationally set, rationally arranging input order, the alloy material of formation has preferable mechanical performance, especially has high ductility, toughness, plasticity, elastic limit, tensile strength, the feature of yield point；There is strong corrosion-resistant, rustless property simultaneously；And use part scrap iron as raw material, carry heavy alloyed steady quality homogeneous.By adding refining agent, degree of porosity reduces by 12 degree.

Description

A kind of Low carbon stainless steel material And preparation method thereof

Technical field

The present invention relates to field of metal preparation, particularly relate to a kind of low carbon stainless steel material and preparation method thereof.

Background technology

The development of steel alloy has had the history of more than 100 year, up to the present, diversified steel alloy is industrially employed, mainly have with Types Below: quenched and tempered steel, spring steel, tool steel, high-speed steel, mould steel, high, normal, basic carbon alloy steel etc., so far, although steel alloy technology is greatly developed, but, still with the presence of a lot of problems, such as abrasion resistance, hardness, rustless property, decay resistance, high and low temperature resistance, fragility, toughness, costs etc. can not be taken into account, the requirement produced it is not met by a lot of occasions, also need to improve further, to improve production efficiency, reduce cost, improve safety, provide safeguard for high-quality precision and sophisticated technology development, power is provided for social development, task is the most arduous.

Summary of the invention

It is an object of the invention to provide a kind of low carbon stainless steel material and preparation method thereof, this alloy material has excellent toughness, ductility, welding performance, rustless property.

Technical scheme is as follows:

A kind of low carbon stainless steel material, it is characterised in that: its chemical element component contained and mass percent thereof be: carbon 0.1-0.25, chromium 9.0-9.5, tungsten 0.01-0.03, silicon 0.06-0.1, aluminum 1.3-1.5, molybdenum 2.7-2.8, boron 0.004-0.008, cobalt 0.8-1.1, vanadium 0.03-0.05, titanium 0.006-0.009, P≤0.030, S≤0.030, surplus are ferrum.

The production method of described low carbon stainless steel material, it is characterised in that:

(1), the pig iron is melted as ferrous substrate source as in 1:2 ratio input stove with scrap iron；Carry out desulfurization, deoxidation, alloying, employing refining agent refine, cast, cast after-baking etc.；

(2) lot sequence, putting into alloying element in alloying process in stove is: (1) silicon, boron；(2) aluminum, molybdenum, vanadium；(3) chromium, cobalt；(4) other residual components；It is 10-12 minute that each batch puts into the time interval of element, stirs after feeding intake.

Described casting after-baking is: first by room temperature with 200-230 DEG C/h of ramp to 930-940 DEG C, be incubated 2.5-3 hour；It is cooled to 630-640 DEG C with 130-150 DEG C/h of speed again, is incubated 30-60 minute；It is cooled to 320-340 DEG C with 100-120 DEG C/h of speed again, is incubated 2-3 hour；Again with 130-150 DEG C/h of ramp to 530-540 DEG C, it is incubated 2-3 hour, takes out air cooling and get final product.

Described refining agent is prepared by the raw materials in: instrument comminuted steel shot 3-4, clay 13-16, precipitated calcium carbonate 2-3, silicon dioxide 2-3, zinc oxide 1-2, wollastonite in powder 3-4, magnesium hydroxide 10-12, kieselguhr 4-5, aluminium hydroxide 8-10, jade powder 3-4, montmorillonite 1-2, BaCO3 3-4, BaF₂2-3；Preparation method is to be mixed by each raw material, is heated to molten condition, then, is poured into Quench in pure water, then is ground into 100-200 mesh powder；Gained powder is added the nano-carbon powder being equivalent to the silane resin acceptor kh-550 of powder weight 2-3%, 1-2%, after mix homogeneously, under 8-15Mpa, is pressed into base, then, calcine 3-4 hour at 900-950 DEG C, after cooling, it is ground into 150-250 mesh powder again, to obtain final product.

Beneficial effects of the present invention

By the present invention in that and combine with the raw metal such as molybdenum, aluminum, proportioning and production technology are rationally set, rationally arranging input order, the alloy material of formation has preferable mechanical performance, especially has high ductility, toughness, plasticity, elastic limit, tensile strength, the feature of yield point；There is strong corrosion-resistant, rustless property simultaneously；And use part scrap iron as raw material, carry heavy alloyed steady quality homogeneous.The present invention is suitable for rolling into the various forging processing workpiece such as angle steel, channel-section steel, I-steel, steel pipe, steel band and steel plate.Refining agent of the present invention is used for Foundry Production, hence it is evident that improves the degree of porosity in yield rate, particularly foundry goods and reduces 1-2 degree, is controlled effectively, and will not produce pore at cast(ing) surface, and trapped oxide is significantly reduced, and oxide inclusion is at about 2 grades.

Detailed description of the invention

A kind of low carbon stainless steel material: its chemical element component contained and mass percent thereof are carbon 0.1-0.25, chromium 9.0-9.5, tungsten 0.01-0.03, silicon 0.06-0.1, aluminum 1.3-1.5, molybdenum 2.7-2.8, boron 0.004-0.008, cobalt 0.8-1.1, vanadium 0.03-0.05, titanium 0.006-0.009, P≤0.030, S≤0.030, surplus are ferrum.

The production method of described low carbon stainless steel material:

(1), the pig iron is melted as ferrous substrate source as in 1:1 ratio input stove with scrap iron；Carry out desulfurization, deoxidation, alloying, employing refining agent refine, cast, cast after-baking etc.；

(2) lot sequence, putting into alloying element in alloying process in stove is: (1) silicon, boron；(2) aluminum, molybdenum, vanadium；(3) chromium, cobalt；(4) other residual components；It is 11 minutes that each batch puts into the time interval of element, stirs after feeding intake.

Described casting after-baking is: first by room temperature with 220 DEG C/h of ramp to 936 DEG C, be incubated 2.8 hours；It is cooled to 635 DEG C with 140 DEG C/h of speed again, is incubated 45 minutes；It is cooled to 330 DEG C with 110 DEG C/h of speed again, is incubated 2.5 hours；Again with 140 DEG C/h of ramp to 535 DEG C, it is incubated 2.6 hours, takes out air cooling and get final product.

Described refining agent is made up of the raw material of following weight portion (kilogram): instrument comminuted steel shot 4, clay 13, precipitated calcium carbonate 2, silicon dioxide 3, zinc oxide 1, wollastonite in powder 4, magnesium hydroxide 12, kieselguhr 4, aluminium hydroxide 8, jade powder 3, montmorillonite 2, BaCO3 3, BaF₂2；Preparation method is to be mixed by each raw material, is heated to molten condition, then, is poured into Quench in pure water, then is ground into 100-200 mesh powder；Gained powder is added the nano-carbon powder being equivalent to the silane resin acceptor kh-550 of powder weight 2-3%, 1-2%, after mix homogeneously, under 8-15Mpa, is pressed into base, then, calcine 3-4 hour at 900-950 DEG C, after cooling, it is ground into 150-250 mesh powder again, to obtain final product.

The mechanical performance of low carbon stainless steel material of the present invention is: hot strength 950MPa, yield strength 865MPa, elongation percentage 15%, the contraction percentage of area 35%, impact absorbing energy 55J, impact flexibility 65J/cm2, hardness 285HB.

Claims

1. a low carbon stainless steel material, it is characterised in that: its chemical element component contained and mass percent thereof be: carbon 0.1-0.25, chromium 9.0-9.5, tungsten 0.01-0.03, silicon 0.06-0.1, aluminum 1.3-1.5, molybdenum 2.7-2.8, boron 0.004-0.008, cobalt 0.8-1.1, vanadium 0.03-0.05, titanium 0.006-0.009, P≤0.030, S≤0.030, surplus are ferrum.

The production method of low carbon stainless steel material the most according to claim 1, it is characterised in that:

(1) pig iron is melted as ferrous substrate source as in 1:2 ratio input stove with scrap iron；Carry out desulfurization, deoxidation, alloying, employing refining agent refine, cast, cast after-baking；

(2) lot sequence putting into alloying element in alloying process in stove is: (1) silicon, boron；(2) aluminum, molybdenum, vanadium；(3) chromium, cobalt；(4) other residual components；It is 10-12 minute that each batch puts into the time interval of element, stirs after feeding intake.

The production method of low carbon stainless steel material the most according to claim 2, it is characterised in that: described casting after-baking is: first by room temperature with 200-230 DEG C/h of ramp to 930-940 DEG C, be incubated 2.5-3 hour；It is cooled to 630-640 DEG C with 130-150 DEG C/h of speed again, is incubated 30-60 minute；It is cooled to 320-340 DEG C with 100-120 DEG C/h of speed again, is incubated 2-3 hour；Again with 130-150 DEG C/h of ramp to 530-540 DEG C, it is incubated 2-3 hour, takes out air cooling and get final product.

The production method of low carbon stainless steel material the most according to claim 2, it is characterised in that: described refining agent is prepared by the raw materials in: instrument comminuted steel shot 3-4, clay 13-16, precipitated calcium carbonate 2-3, silicon dioxide 2-3, zinc oxide 1-2, wollastonite in powder 3-4, magnesium hydroxide 10-12, kieselguhr 4-5, aluminium hydroxide 8-10, jade powder 3-4, montmorillonite 1-2, BaCO3 3-4, BaF2 2-3；Preparation method is to be mixed by each raw material, is heated to molten condition, then, is poured into Quench in pure water, then is ground into 100-200 mesh powder；Gained powder is added the nano-carbon powder being equivalent to the silane resin acceptor kh-550 of powder weight 2-3%, 1-2%, after mix homogeneously, under 8-15MPa, is pressed into base, then, calcine 3-4 hour at 900-950 DEG C, after cooling, it is ground into 150-250 mesh powder again, to obtain final product.