CN101693980B - Flat steel and manufacture method thereof - Google Patents

Flat steel and manufacture method thereof Download PDF

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Publication number
CN101693980B
CN101693980B CN2009100756751A CN200910075675A CN101693980B CN 101693980 B CN101693980 B CN 101693980B CN 2009100756751 A CN2009100756751 A CN 2009100756751A CN 200910075675 A CN200910075675 A CN 200910075675A CN 101693980 B CN101693980 B CN 101693980B
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steel
reaches
annealing
steel ingot
forging
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CN101693980A (en
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孟传峰
许洪新
杜义
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Shanxi Taigang Stainless Steel Co Ltd
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Shanxi Taigang Stainless Steel Co Ltd
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Abstract

The present invention relates to flat steel and a manufacture method thereof. The flat steel comprises the following components: 0.17-0.25 percent of C, 1.00-1.50 percent of Si, 2.00-3.50 percent of Mn, 1.00-1.50 percent of Ni, 0.03-0.10 percent of Ti and the balance of Fe and unavoidable impurities. The flat steel is manufactured by the procedures of casting, steel ingot annealing, at least three repeated first jumping-up and then drawing out forging, annealing again, sample quenching and low-temperature tempering, wherein Rm reaches 1570MPa and AKU reaches 118-136J. The manufacture method comprises the following steps: 1, melting by a vacuum induction furnace according to the component requirements; 2, casting molten steel into the steel ingot; 3, annealing the steel ingot under the condition that the temperature is preserved for more than or equal to 4h at 590-690 DEG C; 4, forging the steel ingot under the condition that the temperature is preserved for more than or equal to 3h at 1180-1200 DEG C, repeatedly carrying out jumping-up and then drawing out forging, heating, preserving the temperature, forging and jumping-up and then drawing out for not less than 3 times; and 5, annealing. As a sample of the manufactured flat steel is quenched and tempered at low-temperature, the Rm reaches 1570MPa and the AKU reaches 118-136J.

Description

A kind of band steel and manufacture method thereof
Technical field
The present invention relates to a kind of band steel and manufacture method thereof.
Background technology
The applicant is in order to develop a kind of repeatedly quick parts of impact load of little energy that bear, as ejection device, the little energy of high cycle repeatedly impact resistance be based on intensity, require certain plasticity and toughness to match.The mechanical property requirements of this steel is Rm 〉=1500Mpa, Aku 〉=90J.Tensile strength Rm and the impact value AKU of existing band steel are on the low side, after heat treatment, do not reach bear little energy repeatedly the parts of quick impact load to the requirement of steel.
Summary of the invention
In order to overcome the above-mentioned deficiency of existing band steel, the invention provides the high band steel of a kind of plasticity and toughness, the mechanical property of band steel of the present invention is higher, after Overheating Treatment, reach bear little energy repeatedly fast the parts of impact load to the requirement of steel.
Design of the present invention is according to its requirement to the high-strong toughness coupling of material, consider processing performance and suitable cost performance, the ultimate principle of bond material design, analyze each component the strength of materials and flexible are influenced rule, pass through microalloying, make material obtain the tissue of low carbon martensite and equally distributed diffusion alloy carbide, the autstenitic grain size of control steel is narrower than 8 grades.
For obtaining low-carbon martensite, the carbon content in the steel should be less than 0.30%, considers cost performance, and research is main alloy element with steel with Mn, and Mn can increase the hardening capacity of steel significantly and improve the tensile strength of steel, makes steel keep high impelling strength.The atomic radius of alloying element Mn, Si, Ni etc. and the atomic radius of Fe are approximate, thereby these elements can form unlimited Solid solution with Fe, these elements add the impelling strength that can not cause lattice that strong distortion takes place in the steel and reduce steel, these element reinforced ferrites, improve the intensity of steel, do not reduce impelling strength simultaneously again.For satisfying the requirement of high-strong toughness, it is main alloy element that material is intended with Mn, Si, Ni, also suits for crystal grain thinning adds an amount of Ti.
Be lower than 0.30% situation in carbon content, the tensile strength that make steel is more than 1500Mpa, in the steel
Manganese content should be at 2.8-3.0%, and the manganese too high levels can reduce the toughness of steel.Silicon can have desirable influence to containing the 3%Mn rigidity, and when 200 ℃ of tempering, silicon can improve impelling strength significantly, and just the temper brittleness scope of steel moves to the comparatively high temps direction, and this is because silicon has improved martensitic temper resistance.
Silicone content is advisable at 1.0-1.5%, and nickel has good shadow noon to the over-all properties of steel, and nickel and other element combine hardening capacity, intensity, the toughness that can increase steel.Consider that from economic aspect nickel is controlled at about 1%.
The quality per distribution ratio of the composition of this high strength steel is:
C:0.17~0.25% Si:1.00~1.50% Mn:2.00~3.50%
Ni:1.00~1.50% Ti:0.03~0.10%
All the other are Fe and unavoidable impurities.
Through casting, steel ingot annealing, be no less than and dial long forging and anneal again behind three times the first jumping-up more repeatedly, its tensile strength Rm reaches 1250Mpa, impact value AKU reaches 118J, it is again after the steel plate highly malleablized thermal treatment of quenching and low-temperaturetempering, the tensile strength Rm of steel reaches 1570Mpa, and impact value AKU reaches 118~136J.It is that 850~900 ℃ * 40 minutes oil quenchings made the return trip empty in 150~200 ℃ * 120 minutes with the low-temperaturetempering process system that steel plate is strengthened quenching.
Along with increasing substantially of the strength of materials, steel plate tensile strength requires greater than 1500Mpa, material to surface imperfection such as crackle, be mingled with and defective that surface working causes seems very responsive.Reduce the imperfection sensitivity of material, improve the fracture toughness property of steel, improve the toughness of high-strength steel, improve its security and reliability under working conditions, just must reduce the content of impurity, gas and detrimental impurity element in the steel.High quality smelting technology and rational thermal distortion processing technology are to improve the purity of steel and the key of density.
The manufacture method of this high strength steel comprise following each step successively:
(1) vacuum induction furnace smelting
At vacuum induction furnace smelting, the raw material of selecting for use is highly purified pure iron, and C, S, P and harmful element all are not more than 30PPm in the pure iron; The ferromanganese of selecting for use, silicon steel, nickel plate and starting material are all through baking, dry, cleaning, and the quality per distribution ratio of molten steel composition reaches following requirement tapping:
C:0.17~0.25% Si:1.00~1.50% Mn:2.00~3.50%
Ni:1.00~1.50% Ti:0.03~0.10%
All the other are Fe and unavoidable impurities.
(2) casting
Above-mentioned molten steel is cast cylindrical steel ingot, 105 millimeters of the general diameter at butt end Φ of steel ingot, 75 millimeters of top diameter Φ.Gating system accomplishes that cleaning is dry, the level and smooth no concave-convex injustice of ingot mould inwall.
(3) steel ingot annealing
Steel ingot is cooled off room temperature, and hot charging is gone into annealing furnace (generally being well formula annealing furnace) and is carried out anneal, is not less than 4 hours 590~690 ℃ of insulations, and steel ingot is at the stove internal cooling, and the steel ingot temperature is not higher than 400 ℃, again steel ingot is taken out naturally cooling in air.
(4) forge
In process furnace internal heating to 1180~1200 ℃, insulation is not less than taking-up in 3 hours with the steel ingot after the annealing.The steel ingot of heating (is adopted the cross forging method, makes steel have the good tropism that waits with the cross forging method.Transverse toughness and plasticity are respectively longitudinally 78% and 93%, to the work-ing life of improving the ejection device be useful.) forging molding as requested.Elder generation dials behind the jumping-up long again, and jumping-up is dialled longly more again, heats, is incubated, forges jumping-up so repeatedly and dial long being no less than 3 times again, and last forging temperature is 850 ℃~920 ℃, and (being meant final forging temperature) generally reaches 880 ℃ ± 20 ℃, is swaged into band steel at last.In air, slowly be chilled to room temperature after being swaged into band steel.
(5) annealing
Cooled band steel in annealing furnace, is heated to 680 ℃, is incubated 4~5 hours anneal.
(6) thermal treatment of steel sample and service check
Get from band steel that its blank quenches and low-temperaturetempering is handled, system is that 850~900 ℃ * 40 minutes oil quenchings made the return trip empty in 150~200 ℃ * 120 minutes.Sample is made the impact specimen of 25 millimeters tensile test bars of Φ and 10 * 10 * 55mm, and the tensile strength Rm of steel reaches 1570Mpa after the quenching low-temperaturetempering technology, and impact value AKU reaches 118~136J.
The band steel that the present invention makes is after quenching and low-temperature tempering heat treatment, and the tensile strength Rm of steel reaches 1570Mpa, and impact value AKU reaches 118~136J.Can satisfy bear little energy repeatedly fast the parts of impact load to the requirement of material.
Embodiment
Describe the embodiment of this high tough band steel and manufacture method thereof in detail below in conjunction with embodiment, but the embodiment of this high tough band steel and manufacture method thereof is not limited to the following examples.Steel plate embodiment
The principal character of this high tough band steel embodiment is:
(1) the quality per distribution ratio of its composition is:
C:0.19% Si:1.1% Mn:2.6% Ni:1.6% Ti:0.06%
P:0.012 S:0.010 O:0.0015 N:0.0027
All the other are Fe and unavoidable impurities.
(2) through vacuum induction furnace smelting, cross forges becomes a useful person, and after the annealing, its tensile strength Rm reaches 1250Mpa, and impact value AKU reaches 118J.Sample is through the quenching low-temperaturetempering, and process system is that 850~900 ℃ * 40 minutes oil quenchings made the return trip empty in 150~200 ℃ * 120 minutes, and after the thermal treatment of steel plate highly malleablized, the tensile strength Rm of steel reaches 1570Mpa, and impact value AKU reaches 118~136J.Its macrostructure (level) sees Table 1
Table 1
General Loosen Center porosity Pattern segregation Subsurface bubble General spot segregation The edge spot segregation
1 1 0 0 0 0
The ultrasonic testing result does not find the defective that 3mm is above, and detected result is qualified.Steel plate is made embodiment
The present embodiment manufacturing be above-mentioned steel plate embodiment.Its manufacture method is a following sequential steps:
(1) vacuum induction furnace smelting
The nominal capacity of vacuum induction furnace is 200kg.Real batch is 130kg.
Pure iron 120kg. (model is YT01) is added in the vacuum induction furnace and smelts, and all raw material is all through baking, dry, cleaning.Smelting the added ferromanganese trade mark is FeMn78C8.0, adds 4.5kg, and the ferrosilicon trade mark is FeSi75A, adds 1.9kg, and nickel plate add-on is 2.1kg, and the titanium alloy trade mark is FeTi30A, adds 0.43kg.The quality per distribution ratio target call of molten steel composition:
C:0.19% Si:1.1% Mn:2.6% Ni:1.6% Ti:0.06%
P:0.012 S:0.010 O:0.0015 N:0.0027
All the other are Fe and unavoidable impurities.[O] content target≤20ppm in the steel, [N] content≤40ppm.
(2) casting
Above-mentioned molten steel is cast 105 millimeters of diameter at butt end Φ, 75 millimeters steel ingots of top diameter Φ.
(3) steel ingot annealing
Steel ingot is cooled to 0 ± 20 ℃ of hot charging goes into well formula annealing furnace and carry out anneal, 590~690 ℃ of insulations 4 hours 30 minutes, steel ingot took out naturally cooling in air at stove internal cooling to 400 ℃ with steel ingot.
(4) forge
Steel ingot after the annealing cell-type process furnace internal heating to 1180~1200 ℃, is incubated taking-up in 3 hours.The steel ingot of heating is used cross forging method forging molding as requested on electric liquid hammer.Elder generation dials behind the jumping-up long again, and jumping-up is dialled long again, heats, is incubated, forges jumping-up so repeatedly and dial longly 4 times again, and the 4th time forging temperature is that 880 ℃ (temperature measurer measurements) are swaged into 55 * 150 * 650mm band steel at last.Be swaged into behind the band steel in air slowly cold 4 hours, final temp is not higher than 40 ℃.
(5) annealing
Cooled band steel in annealing furnace, is heated to 600~680 ℃, is incubated 4 hours anneal, at the stove internal cooling.
(6) thermal treatment of steel sample and service check
Get from band steel that its blank quenches and low-temperaturetempering is handled, system is that 850~900 ℃ * 40 minutes oil quenchings made the return trip empty in 150~200 ℃ * 120 minutes.Sample is made the impact specimen of 25 millimeters tensile test bars of Φ and 10 * 10 * 55mm, and the tensile strength Rm of steel reaches 1570Mpa after the quenching low-temperaturetempering technology, and impact value AKU reaches 118~136J.
Its macrostructure (level) sees Table 2, and (the macrostructure check does not need thermal treatment with flaw detection, and service check is that performance is heat-treated and detected to the small sample of steel.)
Table 2
General Loosen Center porosity Pattern segregation Subsurface bubble General spot segregation The edge spot segregation
1 1 0 0 0 0
The ultrasonic testing result does not find the defective that 3mm is above, and detected result is qualified.

Claims (2)

1. band steel is characterized in that:
(1) the quality per distribution ratio of its composition is:
C:0.17~0.25% Si:1.00~1.50% Mn:2.00~3.50%
Ni:1.00~1.50% Ti:0.03~0.10%
All the other are Fe and unavoidable impurities;
(2) through casting, steel ingot annealing, be no less than and dial long forging and anneal again behind three times the first jumping-up more repeatedly, its tensile strength Rm reaches 1250Mpa, impact value AKU reaches 118J, it is again after the steel plate highly malleablized thermal treatment of quenching and low-temperaturetempering, the tensile strength Rm of steel reaches 1570Mpa, and impact value AKU reaches 118~136J; It is that 850~900 ℃ * 40 minutes oil quenchings made the return trip empty in 150~200 ℃ * 120 minutes with the low-temperaturetempering process system that steel plate is strengthened quenching.
2. the manufacture method of the described band steel of claim 1, it comprises following sequential steps:
(1) vacuum induction furnace smelting
At vacuum induction furnace smelting, the raw material of selecting for use is highly purified pure iron, and C, S, P and harmful element all are not more than 30PPm in the pure iron; The ferromanganese of selecting for use, silicon steel, nickel plate and starting material are all through baking, dry, cleaning, and the quality per distribution ratio of molten steel composition reaches following requirement tapping:
C:0.17~0.25% Si:1.00~1.50% Mn:2.00~3.50%
Ni:1.00~1.50% Ti:0.03~0.10%
All the other are Fe and unavoidable impurities;
(2) casting
Above-mentioned molten steel is cast cylindrical steel ingot, and gating system accomplishes that cleaning is dry, the level and smooth no concave-convex injustice of ingot mould inwall;
(3) steel ingot annealing
Steel ingot is cooled off room temperature, and hot charging is gone into annealing furnace and is carried out anneal, is not less than 4 hours 590~690 ℃ of insulations, and steel ingot is at the stove internal cooling, and the steel ingot temperature is not higher than 400 ℃, again steel ingot is taken out naturally cooling in air;
(4) forge
In process furnace internal heating to 1180~1200 ℃, insulation is not less than taking-up in 3 hours with the steel ingot after the annealing; With the steel ingot of heating cross forging method forging molding as requested, dial long behind elder generation's jumping-up again, jumping-up is dialled long more again, heat, be incubated, forge jumping-up so repeatedly and dial long being no less than 3 times again, last forging temperature is 850 ℃~920 ℃, be swaged into band steel at last, in air, slowly be chilled to room temperature after being swaged into band steel.
CN2009100756751A 2009-09-30 2009-09-30 Flat steel and manufacture method thereof Active CN101693980B (en)

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CN102011048B (en) * 2010-09-29 2012-11-14 山西太钢不锈钢股份有限公司 Nickel-based low-temperature pressure vessel steel and manufacturing method thereof
CN102441631B (en) * 2011-11-16 2013-09-25 抚顺特殊钢股份有限公司 Method for forging alloy steel ingot with smaller diameter and larger height-diameter ratio into wider flat billet
CN102581187B (en) * 2012-02-21 2014-01-22 山西太钢不锈钢股份有限公司 Method for forging flat steel by using universal hammerhead
CN102864382B (en) * 2012-07-26 2014-06-04 四川六合锻造股份有限公司 Method for reducing X20Cr13 longitudinal and transverse mechanical property differences
CN104841823A (en) * 2015-05-25 2015-08-19 无锡市派克重型铸锻有限公司 Forging process for improving 1Cr11Ni2W2MoV forging grain size
CN109402512B (en) * 2018-11-28 2021-04-20 武汉重工铸锻有限责任公司 Heat treatment method capable of improving strength of 25Cr3NiMoW material forged piece
CN109825763B (en) * 2019-01-23 2021-04-30 邢台钢铁有限责任公司 Industrial pure iron for high-conductivity cathode flat steel and production method thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1079513A (en) * 1991-12-30 1993-12-15 浦项综合制铁株式会社 Hadfield Steel and manufacturing process thereof with superior formability, intensity and weldability
CN1113391A (en) * 1993-08-04 1995-12-13 新日本制铁株式会社 High tensile strength steel having superior fatigue strength and weldability at welds and method for manufacturing the same
CN1254765A (en) * 1998-10-27 2000-05-31 川崎制铁株式会社 Electric steel sheet with better deformability and magnetic properties and its making method
CN101348882A (en) * 2007-07-20 2009-01-21 常曙光 High stress, high plasticity and high hardenability large cross section spring steel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1079513A (en) * 1991-12-30 1993-12-15 浦项综合制铁株式会社 Hadfield Steel and manufacturing process thereof with superior formability, intensity and weldability
CN1113391A (en) * 1993-08-04 1995-12-13 新日本制铁株式会社 High tensile strength steel having superior fatigue strength and weldability at welds and method for manufacturing the same
CN1254765A (en) * 1998-10-27 2000-05-31 川崎制铁株式会社 Electric steel sheet with better deformability and magnetic properties and its making method
CN101348882A (en) * 2007-07-20 2009-01-21 常曙光 High stress, high plasticity and high hardenability large cross section spring steel

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