CN102162071B - Limit mandrel steel material for rolled tubes and preparation method thereof - Google Patents

Limit mandrel steel material for rolled tubes and preparation method thereof Download PDF

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CN102162071B
CN102162071B CN 201010112417 CN201010112417A CN102162071B CN 102162071 B CN102162071 B CN 102162071B CN 201010112417 CN201010112417 CN 201010112417 CN 201010112417 A CN201010112417 A CN 201010112417A CN 102162071 B CN102162071 B CN 102162071B
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steel
steel material
temperature
mandrel
tubes
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CN102162071A (en
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蔡海燕
田玉新
陆明和
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Baoshan Iron and Steel Co Ltd
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Abstract

The invention relates to high-performance limit mandrel steel material for rolled tubes and a preparation method thereof. The steel material comprises the following components in percentage by mass: 0.40-0.48% of C, 0.40-0.80% of Si, 0.30-0.60% of Mn, at most 0.010% of P, at most 0.008% of S, 2.30-3.00% of Cr, 2.0-2.5% of Mo, 1.0-1.5% of V, 0.50-0.80% of Ni, 0.04-0.10% of Nb, 0.015-0.035% of Al, and the balance of Fe and inevitable impurity. The limit mandrel steel material for rolled tubes has favorable high-temperature properties, and greatly prolongs the service life of the mandrel. The mandrel prepared from the steel material provided by the invention can be used for rolling 3500-4200 tubes by one charging, but H13 steel can only be used for rolling 2000-3000 rubes under the same conditions. The invention prolongs the service life by about 50%, lowers the production cost of the steel tubes and enhances the production efficiency.

Description

Tube rolling retained mandrel steel
Technical field
The invention belongs to field of alloy steel, relate generally to a kind of manufacturing tube rolling high-performance retained mandrel steel and manufacture method thereof.
Background technology
At present, tube rolling is mainly to make with USS hot-work die steel H13 with retained mandrel.This steel has the characteristics such as obdurability has both, technology stability is good, production cost is relatively low and is widely adopted.But H13 only is suitable for using at the working condition below 600 ℃.Due to plug in work will penetrate greater than the high temperature hollow billet of 1000 ℃ in engineering, the plug body externally forces still to need under cooling conditions to bear the high temperature up to 700 ℃, when thermal cycling stresses surpasses the high-temperature yield strength of plug itself, mandrel surface will produce heat fatigue cracking, accelerates the early failure of plug.Existing H13 retained mandrel after 2000~3000 cold and hot fatigue and cyclic, because the thermal fatigue well damage causes scrapping, causes production cost to increase with steel, and production efficiency reduces.Therefore, use the life-span of retained mandrel in order to improve tube rolling, must improve the fatigue lifetime of steel.
Adopt the investigator of constant stress controlled thermal fatigue test to generally believe, the strength of materials is higher, and fatigue lifetime is longer, because high yield strength can be resisted the stress that thermal cycling produces.As long as the stress that thermal cycling produces is no more than the yield strength of material, material just can not ftracture.Therefore, improving high-temperature yield strength and the anti-temper softening ability of mandrel steel material, is the key point that improves its work-ing life.
For obtaining this high-performance retained mandrel steel, to consider from the Composition Design angle, the composition of reply H13 steel is suitably adjusted, and adds the strong alloying element of some anti-temper softening abilities, to improve the mechanical behavior under high temperature of steel.Steel as disclosed in patent application CN200510085632.3, although have some improvement with H13 phase specific tenacity, but because Mo in steel, V content are lower, and do not contain the Nb element, therefore its mechanical behavior under high temperature is close with the H13 performance with anti-temper softening ability, does not reach obvious improvement.And for example the disclosed steel of patent application CN200410075066.3, improve performance although added one or more alloying elements such as RE, W, B, Zr, Mg, Ti, also makes manufacturing process complicated simultaneously, and production cost increases.In addition, its C, Mo, V content are lower, and Si, Cr content are higher, and the intensity of improving steel is also had certain restriction.
Therefore, need a kind of steel of at high temperature excellent property badly, as the material of tube rolling with retained mandrel.
Summary of the invention
The object of the present invention is to provide a kind of high-performance tube rolling retained mandrel steel.
For achieving the above object, steel provided by the present invention, its composition quality degree is: C:0.40~0.48%, Si:0.40~0.80%, Mn:0.30~0.60%, P :≤0.010%, S :≤0.008%, Cr:2.30~3.00%, Mo:2.00~2.50%, V:1.00~1.50%, Ni:0.50~0.80%, Nb:0.04~0.10%, Al:0.015~0.035%, surplus are Fe and inevitable impurity.
In addition, the present invention also provides a kind of manufacture method of above-mentioned steel, comprises successively electric arc furnace and ladle furnace vacuum refinement, esr, forging, annealing, modifier treatment, and wherein modifier treatment comprises oil quenching and two steps of high tempering.
Preferably, the temperature of described oil quenching is 1050-1100 ℃.
Preferably, the temperature of described high tempering is 620-700 ℃.Further preferably, described high tempering temperature is 650-700 ℃.
The below will further illustrate the present invention.
The present invention reduces Cr content on Composition Design, increase Mo, V content, to promote high-temperature stable phase Mo 2C and V 4C 3Formation, and reduce high temperature unstable phase Cr 7C 3And Cr 23C 6Formation, thereby improve its use temperature.In addition, make V 4C 3Dissolve in austenite, need to adopt the austenitizing temperature more than 1050 ℃, will cause the alligatoring of austenite crystal.Therefore after adding the Nb micro alloying element in steel, can form the better tiny NbC particle of stability, to stop growing up of austenite crystal, make the obvious refinement of austenite crystal, thereby improve the plasticity and toughness of steel.Simultaneously, the present invention utilizes this rule to make invention steel grade tempering temperature when producing obviously to improve just, thereby has obviously improved the anti-temper softening ability of steel.In addition, more near its use temperature, make the invention steel in use have better structure stability due to tempering temperature.Moreover, because of after adding appropriate Ni, its ductility and toughness at room temperature is further improved in steel.
Below the design of composition of steel of the present invention is described:
The increase of C:C content can make the hot strength of steel, hot hardness and wearability improve, and therefore the C content of H13 steel suitably can be improved.But C content is too high, can cause its toughness to reduce, and therefore, the C content of steel of the present invention adopts 0.40~0.48%.
Si:Si adds and has played deoxidation in steel and improved corrosion proof effect.But Si can reduce the thermal conductivity of steel, increases the heat accumulation effect of plug, thereby reduces the work-ing life of plug.And Si content increases, and can reduce the impelling strength of material.Therefore, the Si mass percentage content in steel remains on 0.40~0.80% scope, helps to obtain best tough cooperation.
Mn:Mn is the essential element of obdurability that improves steel, and limiting its mass percentage content scope at this is 0.30~0.60%.
Cr: the Cr part in steel is dissolved in and is played solution strengthening effect in steel, and another part is combined with C and is formed Cr 7C 3And Cr 23C 6, but these two kinds of carbide are at high temperature unsettled, at high temperature can not play good strengthening effect.In addition, when Cr mass percentage content>3%, can stop V 4C 3Generation and postpone Mo 2The coherence of C is separated out, and affects the strengthening effect of Mo and V.Therefore, must reduce Cr content.The mass percentage content of Cr is 2.30~3.00% in steel of the present invention.
Adding of Mo:Mo is in order to improve the secondary hardening effect.Generally in order to produce the secondary hardening effect, the add-on of Mo is not less than 1.0%, adds 3.0% just to reach the extreme value effect, adds 2.00~2.50% can obtain best effect.Therefore, the mass percentage content of Mo is 2.00~2.50% in steel of the present invention.
The effect of V:V is mainly crystal grain thinning and tissue, increases temper resistance and secondary hardening effect.When V content hangs down, the not enough V that forms 4C 3, can not produce the secondary hardening effect; When surpassing 1.5% because the precipitate alligatoring makes mis-behave.Therefore, controlling its mass percentage content is 1.00~1.50%.
Ni:Ni is in order to improve temperature-room type plasticity and toughness.Add-on is lower than 0.30%, DeGrain, and still, in hot-work die steel, Ni can promote in the quench cooled process to have reduced carbide forming element in matrix, thereby to have reduced its thermostability along the austenite grain boundary carbide precipitate.Therefore, do not add too much Ni in high performance hot-work die steel, controlling in the present invention its quality percentage composition is 0.50~0.80%.
Adding of Nb:Nb is for crystal grain thinning, the intensity that has improved material and plasticity.But add-on lower than 0.04% the time, DeGrain, when surpassing 0.10% because the precipitate alligatoring makes mis-behave.
Al:Al has played the effect of desoxydatoin and crystal grain thinning in steel.When add-on lower than 0.015% the time, DeGrain, add-on surpasses 0.035%, the mechanical property variation.
The present invention is conceived to improve high-temperature behavior and the anti-temper softening ability of material on design of material, suitably improve the content of Mo, V alloy element, reduce the Cr constituent content, and add appropriate Nb, Ni element, control the foreign matter contents such as P, S, after final modified thermal treatment, can obtain high performance retained mandrel steel.
Compare with steel with existing retained mandrel, the present invention has following beneficial effect:
1, high-temperature behavior is good, greatly improved the plug life-span, but to 3500~4200 of the wroughtsteel pipes of reparation that roll off the production line, and H13 steel 2000~3000 of wroughtsteel pipes under similarity condition improve 50% left and right its work-ing life to the plug of invention steel manufacturing through installation once;
2, reduce steel pipe's production cost and enhancing productivity.
Embodiment
According to the chemical composition requirement of steel grade of the present invention, steel billet is through electric arc furnace and ladle furnace vacuum refinement, esr, forging and annealing.In modifier treatment, at 1060 ℃ of lower oil quenchings, afterwards respectively at 620 ℃ and 700 ℃ of lower high temperings, to make the steel sample of different size.In order to contrast, in production steel of the present invention, the Comparative Examples that adopts same process to produce the H13 steel.Embodiment/Comparative Examples is taken a sample, carry out respectively room temperature and high temperature tension test, room temperature shock test and upper machine certification test.Its result is as follows.
The chemical composition of table 1 embodiment and Comparative Examples (wt%)
Figure GSA00000036642900041
The mechanical property of table 2 embodiment steel and Comparative Examples steel and work-ing life are relatively
Figure GSA00000036642900051
Tube rolling of the present invention is good with retained mandrel steel mechanical behavior under high temperature, and anti-temper softening ability is strong, and greatly improve work-ing life, can replace common H13 retained mandrel steel.Its successful design and development will bring huge economic benefit, and its market outlook will be very huge.

Claims (2)

1. tube rolling retained mandrel steel, its composition quality degree is:
Figure FSB00001024779400011
Surplus is Fe and inevitable impurity;
The method manufacturing of described steel by in turn including the following steps: electric arc furnace and ladle furnace vacuum refinement, esr, forging, annealing, modifier treatment, wherein, modifier treatment comprises oil quenching and two steps of high tempering;
The temperature of described oil quenching is 1050-1100 ℃;
The temperature of described high tempering is 620-700 ℃.
2. a kind of tube rolling retained mandrel steel as claimed in claim 1, is characterized in that, the temperature of described high tempering is 650-700 ℃.
CN 201010112417 2010-02-23 2010-02-23 Limit mandrel steel material for rolled tubes and preparation method thereof Active CN102162071B (en)

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CN103033463A (en) * 2012-12-26 2013-04-10 江南大学 Method for simultaneously detecting two pathogenic bacteria by employing quantum dot marked aptamer recognition and flow cytometry
CN104227350A (en) * 2014-09-02 2014-12-24 中原特钢股份有限公司 Preparing method of retained mandrel
CN105568173B (en) * 2014-10-15 2017-07-28 宝钢特钢有限公司 A kind of high-obdurability low-alloy heat resisting steel and its manufacture method
CN104451028A (en) * 2014-11-25 2015-03-25 南通新正大特钢有限公司 Smelting process for mandrel steel

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CN1251786A (en) * 1999-10-19 2000-05-03 赵士英 Technology for manufacturing mandrel used to roll seamless steel tube
CN1616700A (en) * 2003-08-28 2005-05-18 河南中原特殊钢厂 Steel for processing movement limiting core stick of continuous tube grimper and its producing process

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CN1616700A (en) * 2003-08-28 2005-05-18 河南中原特殊钢厂 Steel for processing movement limiting core stick of continuous tube grimper and its producing process

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