CN103131950A - Rear-earth-containing seamless steel tube material for high-pressure fertilizer and preparation method thereof - Google Patents
Rear-earth-containing seamless steel tube material for high-pressure fertilizer and preparation method thereof Download PDFInfo
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- CN103131950A CN103131950A CN2013100932393A CN201310093239A CN103131950A CN 103131950 A CN103131950 A CN 103131950A CN 2013100932393 A CN2013100932393 A CN 2013100932393A CN 201310093239 A CN201310093239 A CN 201310093239A CN 103131950 A CN103131950 A CN 103131950A
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Abstract
The invention discloses a rear-earth-containing seamless steel tube material for high-pressure fertilizer. The rear-earth-containing seamless steel tube material comprises the following components in percentage by weight: 0.08%-0.15% of C, 0.28%-0.48% of Si, 0.35%-0.55% of Mn, 4.00%-6.00% of Cr, 0.45%-0.65% of Mo, not more than 0.02% of P, not more than 0.02% of S, 0.002%-0.005% of Re and the balance being Fe. The invention further discloses a preparation method of the rear-earth-containing seamless steel tube material for high-pressure fertilizer. The rear-earth-containing seamless steel tube material for high-pressure fertilizer disclosed by the invention is unique in production process, high in production efficiency, high in cost, energy-saving and environment-friendly in production process; and the produced seamless steel tube has good compression strength and corrosion resistance, and is in good economic benefits, suitable for large-scale production and good in popularization value.
Description
Technical field
The present invention relates to a kind of metallurgical material technology, specifically, relate to a kind of rare earth high pressure chemical fertilizer that contains with weldless steel tube material and preparation method thereof, can prepare have a compressive strength and erosion resistance preferably contain rare earth high pressure chemical fertilizer weldless steel tube.
Background technology
Chemical fertilizer as the important leverage of agriculture production and grain security, through sustained and rapid development for many years, occupies considerable position as important capital goods in the agricultural sector in national product and development.Along with the develop rapidly of chemical engineering industry, drive the continuous increase that the high pressure chemical fertilizer is used the weldless steel tube demand.The high pressure chemical fertilizer requires steel to have good intensity, toughness and mechanical property with the use properties of weldless steel tube.In prior art, in order to guarantee the use properties of weldless steel tube, the one, the method for taking to add alloying element in soft steel strengthens the mechanical property of steel; The 2nd, in the increase steel, the content of Cr, make it have resistance to corrosion preferably; The 3rd, add the appropriate alloying elements such as Mo in steel, improve the hot strength of steel.In steel carbon content than low guaranteed steel higher toughness is arranged, Cr content has guaranteed that steel has good resistance to corrosion, the Mo that adds has in right amount improved the mechanical behavior under high temperature of steel.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of rare earth high pressure chemical fertilizer weldless steel tube material that contains, and has good compressive strength and erosion resistance.
Technical scheme of the present invention is as follows:
A kind of rare earth high pressure chemical fertilizer weldless steel tube material that contains, the quality percentage composition of the composition of described weldless steel tube material is: C0.08～0.15, Si0.28～0.48, Mn0.35～0.55, Cr4.00～6.00, Mo0.45～0.65, P≤0.02, S≤0.02, Re0.002～0.005, all the other are Fe, and each composition quality mark amounts to 100%.
Further, the quality percentage composition of the composition of described weldless steel tube material is: C is that 0.142, Si is that 0.381, Mn is that 0.482, Cr is that 4.85, Mo is that 0.471, P is that 0.012, S is that 0.006, Re is 0.002, and all the other are Fe, and each composition quality mark amounts to 100%; Perhaps, C is that 0.140, Si is that 0.397, Mn is that 0.445, Cr is that 4.64, Mo is that 0.494, P is that 0.015, S is that 0.004, Re is 0.004, and all the other are Fe, and each composition quality mark amounts to 100%; Perhaps, C is that 0.138, Si is that 0.420, Mn is that 0.488, Cr is that 4.67, Mo is that 0.478, P is that 0.020, S is that 0.007, Re is 0.003, and all the other are Fe, and each composition quality mark amounts to 100%; Perhaps, C is that 0.08, Si is that 0.48, Mn is that 0.55, Cr is that 6.0, Mo is that 0.65, P is that 0.10, S is that 0.004, Re is 0.005, and all the other are Fe, and each composition quality mark amounts to 100%; Perhaps, C is that 0.15, Si is that 0.28, Mn is that 0.35, Cr is that 4.0, Mo is that 0.45, P is that 0.02, S is that 0.02, Re is 0.002, and all the other are Fe, and each composition quality mark amounts to 100%.
Further, Re comprises La and Ce.
Another technical problem to be solved by this invention is to provide a kind of preparation method that rare earth high pressure chemical fertilizer is used weldless steel tube that contains, production efficiency is high, cost is low, energy-conserving and environment-protective, can prepare have a compressive strength and erosion resistance preferably contain rare earth high pressure chemical fertilizer weldless steel tube.
Technical scheme of the present invention is as follows:
A kind of rare earth high pressure chemical fertilizer that contains comprises with the preparation method of weldless steel tube: the operation of rolling of steelmaking process, weldless steel tube and roll attitude weldless steel tube heat treatment process; Production obtains contains rare earth high pressure chemical fertilizer and with the quality percentage composition of the composition of weldless steel tube is: C0.08～0.15, Si0.28～0.48, Mn0.35～0.55, Cr4.00～6.00, Mo0.45～0.65, P≤0.02, S≤0.02, Re0.002～0.005, all the other are Fe, each composition quality mark amounts to 100%; Wherein, Re comprises La and Ce.
Further, described steelmaking process comprises: hot metal pretreatment, converter smelting, LF refining, VD is degassed and round billet continuous casting.
Further, described converter smelting adopts 100 tons of top and bottom combined blown converters, adopt desulphurised hot metal, ferrosilicon, ferromanganese and ferrochrome adopt deoxidation alloying, and single slag technique, finishing slag basicity are 3.0, the quality percentage composition of converter terminal Composition Control S is not more than 0.03%, the quality percentage composition of P is not more than 0.015%, and the converter molten steel temperature is controlled at more than 1600 ℃, adds lime piece 100～300kg in tapping process; Two refining productions are adopted in described LF refining, and whole process is carried out slag making desulfurization, molten steel heating and composition adjustment by the normal Argon of refining according to converter molten steel composition and temperature; Vacuum tightness≤0.10KPa that described VD is degassed, dark vacuum time 〉=13min feeds 150 meters of silicon-calcium wires after vacuum, then carry out soft blow, and the soft blow time is greater than 12min; The target value of the quality percentage composition of the molten steel chemical composition that described round billet continuous casting is used is C0.12%, Si0.4%, Mn0.5%, P≤0.2%, S≤0.15%, Cr5%, Mo0.5%, described round billet continuous casting adopts the induction stirring mode, condensate depression Δ T≤30 ℃, pulling rate is controlled at 0.8m/min, constant pulling rate, cooling employing Slow cooling mode.
Further, the operation of rolling of described weldless steel tube comprises: circle base sawing, heating, perforation, tube rolling, tension reducing, sampling, cooling, crop end, aligning, inspection, pack, weigh and put in storage; During described round base perforation, temperature is 1250～1280 ℃; During tube rolling, temperature is 1180～1220 ℃; Fixed temperature when subtracting is 820～860 ℃.
Further, described rolling in attitude weldless steel tube heat treatment process, 750 ℃ of shove charges, annealing temperature is 820～920 ℃, and soaking time is 60～150 minutes, and the air cooling of coming out of the stove after furnace cooling to 650 ℃ is to room temperature.
Further, it is characterized in that, produce the rare earth high pressure chemical fertilizer that contains obtain and with the quality percentage composition of the composition of weldless steel tube be: C is that 0.142, Si is 0.381, Mn is 0.482, Cr is that 4.85, Mo is that 0.471, P is 0.012, S is 0.006, Re is 0.002, and all the other are Fe, and each composition quality mark amounts to 100%; Perhaps, C is that 0.140, Si is that 0.397, Mn is that 0.445, Cr is that 4.64, Mo is that 0.494, P is that 0.015, S is that 0.004, Re is 0.004, and all the other are Fe, and each composition quality mark amounts to 100%; Perhaps, C is that 0.138, Si is that 0.420, Mn is that 0.488, Cr is that 4.67, Mo is that 0.478, P is that 0.020, S is that 0.007, Re is 0.003, and all the other are Fe, and each composition quality mark amounts to 100%; Perhaps, C is that 0.08, Si is that 0.48, Mn is that 0.55, Cr is that 6.0, Mo is that 0.65, P is that 0.10, S is that 0.004, Re is 0.005, and all the other are Fe, and each composition quality mark amounts to 100%; Perhaps, C is that 0.15, Si is that 0.28, Mn is that 0.35, Cr is that 4.0, Mo is that 0.45, P is that 0.02, S is that 0.02, Re is 0.002, and all the other are Fe, and each composition quality mark amounts to 100%.
Technique effect of the present invention is as follows:
The invention provides a kind of rare earth high pressure chemical fertilizer weldless steel tube material that contains, Cr makes steel have resistance to corrosion preferably, Mo can improve the hot strength of steel, Re makes steel have good toughness, has good intensity, toughness and mechanical property with the rare earth high pressure chemical fertilizer that contains of its preparation with weldless steel tube.Low temperature of the present invention has unique production technique with weldless steel tube, production efficiency is high, cost is low, the energy-saving production technology environmental protection, and the weldless steel tube of producing has good compressive strength and erosion resistance, and is good in economic efficiency, be suitable for scale operation, good promotional value is arranged.
Embodiment
It is raw material that the present invention adopts the own ore of Baogang, contains rare earth element in this ore.This rare earth element comprises La and Ce.
The steelmaking process of steel is:
Steel smelt the continuous casting process flow process be hot metal pretreatment → converter smelting → LF refining → VD degassed → round billet continuous casting.Wherein converter smelting adopts 100 tons of top and bottom combined blown converters, desulphurised hot metal, and the alloys such as ferrosilicon, ferromanganese adopt deoxidation alloying, single slag technique, finishing slag basicity is controlled by 3.0.Converter terminal Composition Control sulphur is not more than 0.03%, and phosphorus is not more than 0.015%, and the converter molten steel temperature is controlled at more than 1600 ℃, adds lime piece 100～300kg in tapping process.Two refining productions are adopted in the LF refining, and whole process is carried out slag making desulfurization, molten steel heating and composition adjustment by the normal Argon of refining according to converter molten steel composition and temperature.VD vacuum tightness≤0.10KPa, dark vacuum time 〉=13min feeds 150 meters of silicon-calcium wires after vacuum, carry out afterwards soft blow, and the soft blow time is greater than 12min.The target value of the quality percentage composition of the molten steel chemical composition of confession continuous casting is C0.12%, Si0.4%, Mn0.5%, P≤0.2%, S≤0.15%, Cr5%, Mo0.5%.Continuous casting adopts the induction stirring mode, condensate depression Δ T≤30 ℃, and pulling rate is controlled at 0.8m/min, constant pulling rate, cooling employing Slow cooling mode.
LF stove (LADLE FURNACE) is ladle refining furnace, is external refining equipment main in Iron and Steel Production.VD shaped steel bag refining furnace is alloying constituent fine setting under oxygen blast under vacuum, decarburization, vacuum stripping, vacuum, is mainly used in refining ultra low-carbon steel and electrical pure iron etc.; VD shaped steel bag refining furnace can carry out alloying constituent fine setting under general Fruit storage and vacuum to molten steel.
After testing, the quality percentage composition of the composition of each sample is as shown in table 1.
Each sample composition of table 1 (mass percent/%)
The operation of rolling of weldless steel tube is: circle base → sawing → heating → perforation → tube rolling → tension reducing → sampling → cooling → crop end → align → check → pack → weigh → warehouse-in.During its circle base perforation, temperature is 1250～1280 ℃; During tube rolling, temperature is 1180～1220 ℃; Fixed temperature when subtracting is 820～860 ℃.Using Ф 180MPM unit rolling specs is the weldless steel tube of Φ 245mm * 18mm.
Rolling attitude weldless steel tube heat treatment process is: 750 ℃ of shove charges, annealing temperature is 820～920 ℃, soaking time is 60～150 minutes, air cooling come out of the stove after furnace cooling to 650 ℃ to room temperature, adopting 750 ℃ of shove charges is the hot charging stove, 650 ℃ are come out of the stove cooling is mainly for the shortening heat treatment cycle, guarantees that it has good rhythm of production.Do not reach this steel grade austenitizing temperature below 750 ℃, and structural transformation below 650 ℃ is completed thoroughly, the rear air cooling of coming out of the stove can not affect its microstructure and property.。
The microstructure examination result of the weldless steel tube after thermal treatment is as shown in table 2.
Each sample metallographic structure of table 2
Annotate: P perlite in table, F are ferrite
As can be seen from Table 2, the inclusion of each sample is tiny, be evenly distributed, and weave construction is suitable, and crystal grain is tiny.
Because rolling and thermal treatment process affect very little on its chemical composition, so through said process production contain rare earth high pressure chemical fertilizer weldless steel tube, the quality percentage composition of the chemical composition of its material is: C0.08～0.15, Si0.28～0.48, Mn0.35～0.55, Cr4.00～6.00, Mo0.45～0.65, P≤0.02, S≤0.02, Re0.002～0.005, all the other are Fe, each composition quality mark amounts to 100%; Re comprises La and Ce.Main alloy element Cr in the composition of this weldless steel tube makes steel have resistance to corrosion preferably, and Mo can improve the hot strength of steel, and Re makes steel have good toughness.
Mechanical property after thermal treatment is as shown in table 3.
Each sample mechanical property of table 3
As can be seen from Table 3, each sample has good strength, toughness and mechanical property, with the weldless steel tube of its preparation, has good compressive strength and erosion resistance.Properties satisfies the requirement of high pressure chemical fertilizer use weldless steel tube under severe condition.
Claims (9)
1. one kind contains rare earth high pressure chemical fertilizer weldless steel tube material, it is characterized in that, the quality percentage composition of the composition of described weldless steel tube material is: C0.08～0.15, Si0.28～0.48, Mn0.35～0.55, Cr4.00～6.00, Mo0.45～0.65, P≤0.02, S≤0.02, Re0.002～0.005, all the other are Fe, each composition quality mark amounts to 100%.
2. the rare earth high pressure chemical fertilizer weldless steel tube material that contains as claimed in claim 1, it is characterized in that, the quality percentage composition of the composition of described weldless steel tube material is: C is that 0.142, Si is 0.381, Mn is 0.482, Cr is that 4.85, Mo is that 0.471, P is 0.012, S is 0.006, Re is 0.002, and all the other are Fe, and each composition quality mark amounts to 100%; Perhaps, C is that 0.140, Si is that 0.397, Mn is that 0.445, Cr is that 4.64, Mo is that 0.494, P is that 0.015, S is that 0.004, Re is 0.004, and all the other are Fe, and each composition quality mark amounts to 100%; Perhaps, C is that 0.138, Si is that 0.420, Mn is that 0.488, Cr is that 4.67, Mo is that 0.478, P is that 0.020, S is that 0.007, Re is 0.003, and all the other are Fe, and each composition quality mark amounts to 100%; Perhaps, C is that 0.08, Si is that 0.48, Mn is that 0.55, Cr is that 6.0, Mo is that 0.65, P is that 0.10, S is that 0.004, Re is 0.005, and all the other are Fe, and each composition quality mark amounts to 100%; Perhaps, C is that 0.15, Si is that 0.28, Mn is that 0.35, Cr is that 4.0, Mo is that 0.45, P is that 0.02, S is that 0.02, Re is 0.002, and all the other are Fe, and each composition quality mark amounts to 100%.
3. the described rare earth high pressure chemical fertilizer weldless steel tube material that contains as arbitrary in claim 1 or 2, is characterized in that, Re comprises La and Ce.
4. one kind contains rare earth high pressure chemical fertilizer with the preparation method of weldless steel tube, it is characterized in that, comprising: the operation of rolling of steelmaking process, weldless steel tube and roll attitude weldless steel tube heat treatment process; Production obtains contains rare earth high pressure chemical fertilizer and with the quality percentage composition of the composition of weldless steel tube is: C0.08～0.15, Si0.28～0.48, Mn0.35～0.55, Cr4.00～6.00, Mo0.45～0.65, P≤0.02, S≤0.02, Re0.002～0.005, all the other are Fe, each composition quality mark amounts to 100%; Wherein, Re comprises La and Ce.
5. the rare earth high pressure chemical fertilizer that contains as claimed in claim 4 with the preparation method of weldless steel tube, is characterized in that, described steelmaking process comprises: hot metal pretreatment, converter smelting, LF refining, VD is degassed and round billet continuous casting.
6. the rare earth high pressure chemical fertilizer that contains as claimed in claim 5 is with the preparation method of weldless steel tube, it is characterized in that: described converter smelting adopts 100 tons of top and bottom combined blown converters, adopt desulphurised hot metal, ferrosilicon, ferromanganese and ferrochrome adopt deoxidation alloying, single slag technique, finishing slag basicity is 3.0, the quality percentage composition of converter terminal Composition Control S is not more than 0.03%, the quality percentage composition of P is not more than 0.015%, the converter molten steel temperature is controlled at more than 1600 ℃, adds lime piece 100～300kg in tapping process; Two refining productions are adopted in described LF refining, and whole process is carried out slag making desulfurization, molten steel heating and composition adjustment by the normal Argon of refining according to converter molten steel composition and temperature; Vacuum tightness≤0.10KPa that described VD is degassed, dark vacuum time 〉=13min feeds 150 meters of silicon-calcium wires after vacuum, then carry out soft blow, and the soft blow time is greater than 12min; The target value of the quality percentage composition of the molten steel chemical composition that described round billet continuous casting is used is C0.12%, Si0.4%, Mn0.5%, P≤0.2%, S≤0.15%, Cr5%, Mo0.5%, described round billet continuous casting adopts the induction stirring mode, condensate depression Δ T≤30 ℃, pulling rate is controlled at 0.8m/min, constant pulling rate, cooling employing Slow cooling mode.
7. the rare earth high pressure chemical fertilizer that contains as claimed in claim 4 is with the preparation method of weldless steel tube, it is characterized in that, the operation of rolling of described weldless steel tube comprises: circle base sawing, heating, perforation, tube rolling, tension reducing, sampling, cooling, crop end, aligning, inspection, pack, weigh and put in storage; During described round base perforation, temperature is 1250～1280 ℃; During tube rolling, temperature is 1180～1220 ℃; Fixed temperature when subtracting is 820～860 ℃.
8. the rare earth high pressure chemical fertilizer that contains as claimed in claim 4 is with the preparation method of weldless steel tube, it is characterized in that, described rolling in attitude weldless steel tube heat treatment process, 750 ℃ of shove charges, annealing temperature is 820～920 ℃, soaking time is 60～150 minutes, and the air cooling of coming out of the stove after furnace cooling to 650 ℃ is to room temperature.
9. the described rare earth high pressure chemical fertilizer that contains as arbitrary in claim 4 to 8 is with the preparation method of weldless steel tube, it is characterized in that, produce the rare earth high pressure chemical fertilizer that contains obtain and with the quality percentage composition of the composition of weldless steel tube be: C is that 0.142, Si is 0.381, Mn is 0.482, Cr is that 4.85, Mo is that 0.471, P is 0.012, S is 0.006, Re is 0.002, and all the other are Fe, and each composition quality mark amounts to 100%; Perhaps, C is that 0.140, Si is that 0.397, Mn is that 0.445, Cr is that 4.64, Mo is that 0.494, P is that 0.015, S is that 0.004, Re is 0.004, and all the other are Fe, and each composition quality mark amounts to 100%; Perhaps, C is that 0.138, Si is that 0.420, Mn is that 0.488, Cr is that 4.67, Mo is that 0.478, P is that 0.020, S is that 0.007, Re is 0.003, and all the other are Fe, and each composition quality mark amounts to 100%; Perhaps, C is that 0.08, Si is that 0.48, Mn is that 0.55, Cr is that 6.0, Mo is that 0.65, P is that 0.10, S is that 0.004, Re is 0.005, and all the other are Fe, and each composition quality mark amounts to 100%; Perhaps, C is that 0.15, Si is that 0.28, Mn is that 0.35, Cr is that 4.0, Mo is that 0.45, P is that 0.02, S is that 0.02, Re is 0.002, and all the other are Fe, and each composition quality mark amounts to 100%.
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| CN103361561A (en) * | 2013-07-05 | 2013-10-23 | 内蒙古包钢钢联股份有限公司 | Seamless steel tube material for coupling material and preparation method thereof |
| CN103820707A (en) * | 2014-02-21 | 2014-05-28 | 内蒙古包钢钢联股份有限公司 | Rare earth-containing ferrite alloy seamless steel pipe and making method thereof |
| CN105803344A (en) * | 2016-05-30 | 2016-07-27 | 苏州双金实业有限公司 | Steel with high stability |
| CN113005276A (en) * | 2021-02-22 | 2021-06-22 | 包头钢铁（集团）有限责任公司 | Novel annealing heat treatment process for seamless steel pipe for 12Cr5Mo high-pressure fertilizer equipment |
| CN114350881A (en) * | 2021-12-03 | 2022-04-15 | 包头钢铁（集团）有限责任公司 | Method for producing low-carbon medium-alloy round pipe billet by LD-LF-VD-MCC system through double refining process |
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| CN102400047A (en) * | 2011-11-15 | 2012-04-04 | 内蒙古包钢钢联股份有限公司 | Method for preparing rare earth-containing seamless steel tube for petroleum cracking |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103361561A (en) * | 2013-07-05 | 2013-10-23 | 内蒙古包钢钢联股份有限公司 | Seamless steel tube material for coupling material and preparation method thereof |
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| CN105803344A (en) * | 2016-05-30 | 2016-07-27 | 苏州双金实业有限公司 | Steel with high stability |
| CN113005276A (en) * | 2021-02-22 | 2021-06-22 | 包头钢铁（集团）有限责任公司 | Novel annealing heat treatment process for seamless steel pipe for 12Cr5Mo high-pressure fertilizer equipment |
| CN114350881A (en) * | 2021-12-03 | 2022-04-15 | 包头钢铁（集团）有限责任公司 | Method for producing low-carbon medium-alloy round pipe billet by LD-LF-VD-MCC system through double refining process |
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Application publication date: 20130605 |