CN103882294A - Ni-saving type low-temperature steel plate and preparation method thereof - Google Patents
Ni-saving type low-temperature steel plate and preparation method thereof Download PDFInfo
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- CN103882294A CN103882294A CN201410076238.2A CN201410076238A CN103882294A CN 103882294 A CN103882294 A CN 103882294A CN 201410076238 A CN201410076238 A CN 201410076238A CN 103882294 A CN103882294 A CN 103882294A
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Abstract
The invention discloses a Ni-saving type low-temperature steel plate and a preparation method thereof. The steel plate comprises the following chemical components in percentage by weight: 0.03%-0.08% of C, 0.05%-0.20% of Si, 0.85%-1.75% of Mn, 0.85%-1.25% of Ni, not greater than 0.20% of Mo, 0.015%-0.06% of Al, not greater than 0.010% of P, not greater than 0.002% of S, and the balance of Fe and inevitable impurities. The preparation method is as follows: heating for more than 1 hour at a heating temperature of 1100 DEG C-1200 DEG C, and then carrying out rolling; carrying out rough rolling for 2-5 times and fine rolling for 3-7 times with a finish rolling temperature of 780 DEG C-860 DEG C, and then cooling to the room temperature; carrying out quenching and tempering thermal treatment, wherein the quenching heating temperature is 750 DEG C-850 DEG C and the heat-preserving time is 0.5-3 hours; then carrying out tempering thermal treatment; tempering with a tempering temperature of 600 DEG C-700 DEG C and heat-preserving time of 0.5 hour-5 hours, and then carrying out air-cooling on the room temperature to obtain the Ni-saving low-temperature steel plate. The steel plate disclosed by the invention is excellent in performance, and has excellent low temperature toughness.
Description
Technical field
The invention belongs to steel alloy technical field, particularly relate to a kind of joint Ni type low temperature steel plate and preparation method thereof.
Background technology
In today social economy's high speed development in the situation that, domestic petroleum, chemical industry equal energy source industry development are rapid, are used for production, storage and conveying liquified petroleum gas, liquefied ammonia, liquid oxygen, liquid nitrogen plant demand to grow with each passing day.According to " 12 " planning of China, continue to optimize the development of fossil energy, accelerate the exploitation of hydrocarbon resources.This will provide wide market and opportunity to develop to Energy production under low temperature environment service condition and storing device manufacturing, has also promoted greatly the development of Cryogenic Steel simultaneously.
For the production of, storage and transportation equipment low-temperature steel, should there is excellent low-temperature flexibility.At present, the technical way that improves low-temperature steel low-temperature flexibility is the Ni that adds content higher in steel, to obtain lower ductile-brittle transition temperature, thus the low-temperature flexibility of raising steel.Growing along with energy and resources demand in global range, realizing the minimizing of steel and low cost becomes an important development direction of steel industry.It is that the proportion of low-temperature steel cost is very large that the alloying cost of Ni accounts for Ni, and therefore, reducing Ni is that low-temperature steel cost becomes an important problem.By rational technological design, the exploitation that realizes joint Ni type low-temperature steel is significant.
Summary of the invention
The object of the present invention is to provide a kind of joint Ni type low temperature steel plate and preparation method thereof, the method adopts rational alloy element component design, by quenching and the tempering heat treatment process optimized, obtains the low-temperature steel with-101 ℃ of low temperature impact properties excellences.
The object of the invention is to be achieved through the following technical solutions:
A kind of joint Ni type low temperature steel plate, it is characterized in that: in this joint Ni type low temperature steel plate each composition by weight percentage ratio be: C:0.03～0.8%, Si:0.05 ~ 0.20%, Mn:0.85～1.75%, Ni:0.85～1.25%, Mo :≤0.20%, Al:0.015～0.030%, P :≤0.008%, S :≤0.002%, surplus is Fe and inevitable impurity.
In joint Ni type low temperature steel plate of the present invention, can contain following one or both alloying elements: Nb:0～0.05%, V:0～0.05%, the total amount of steel interalloy element is not more than 3%.
Save a manufacture method for Ni type low temperature steel plate, it is characterized in that the method comprises the following steps:
1) heating: blank is packed in process furnace and heated, and Heating temperature is 1100-1200 ℃, and the time is greater than 1 hour, is rolled after heating;
2) rolling: roughing rolling 2-5 passage, finish rolling rolling 3-7 passage, finishing temperature is 780～860 ℃, rolls rear water-cooled to room temperature;
3) thermal treatment: quench and tempering heat treatment, wherein quenching temperature is 750～850 ℃, and soaking time is 0.5～3 hour, carries out subsequently quenching heat treatment; Tempering temperature is 600～700 ℃, and soaking time is 0.5～5 hour, and after tempering, air cooling, to room temperature, obtains saving Ni type low temperature steel plate.
The effect of the each element of the present invention and proportioning are according to as follows:
Carbon: the alloy carbide that carbon can form disperse educt in steel is strengthened steel, but the low-temperature flexibility of steel can be sharply lowered in the rising of carbon content, and the ductile-brittle transition temperature of steel is raise.The carbon content scope of steel of the present invention is 0.03～0.08%.
Silicon: one of deoxidant element in steel, silicon is non-carbide forming element simultaneously, is stored in ferrite or austenite with the form of sosoloid, has stronger solution strengthening effect, can improve intensity and the hardness of steel.But excessive silicon will reduce toughness and the plasticity of steel to a certain extent.Comprehensive above-mentioned consideration, the silicone content scope of steel of the present invention is 0.05～0.20%.
Manganese: manganese can significantly improve the hardening capacity of steel, can also effectively suppress tempering time, carbide is separated out and segregation from martensite, has certain solution strengthening effect simultaneously.Manganese content range of the present invention is 0.85～1.75%.
Nickel: nickel has the effect that reduces steel ductile-brittle transition temperature.Nickel can improve the activity of carbon, strengthens segregation and the precipitation of carbon atom dislocation around, thereby hinders moving of dislocation and steel is strengthened, but comparatively costliness of its price should be controlled at 0.90 ~ 1.20%.
Molybdenum: molybdenum can significantly improve the hardening capacity of steel, the temper brittleness while being used in conjunction with due to nickel in inhibition steel, the carbide that steel is separated out in the time of tempering is more tiny, even, stable, and makes martensitic small grains and high density dislocation remain to comparatively high temps; In addition, molybdenum can improve the resistance for delayed fracture of steel.Steel molybdenum content of the present invention should be controlled in 0 ~ 0.20%.
Niobium: niobium has the effect of thinning microstructure.Solid solution Nb and deformation induced separate out Nb (C, N) can strongly inhibited austenitic recrystallize under high temperature, thereby in the austenite of non-recrystallization, obtain more shape changeable band, improve follow-up Nucleation rate, the tissue after refinement phase transformation; In addition, the solid solution niobium in austenite can effectively improve the hardening capacity of steel.Steel content of niobium of the present invention is in 0.05%.
Vanadium: vanadium has remarkable precipitation strength effect.The VC particle of small and dispersed can be from martensite or ferrite matrix Precipitation, thereby steel is significantly strengthened, but too high content of vanadium, precipitation strength effect improves not obvious, and cost is higher.Steel content of vanadium of the present invention is controlled in 0.05%.
Aluminium: aluminium is strong deoxidant element, also can be combined with N and form AlN, can play to a certain extent Grain refinement.The aluminium content range of steel of the present invention is 0.015～0.06%.
P and s: impurity element in steel, easily worsen the performance of steel, especially worsen the toughness of steel, its content should be controlled at respectively in 0.010% and 0.002%.
The present invention adopts converter or electrosmelting, adopts continuous casting or die casting production rolling blank.
The invention has the advantages that:
Adopt reasonable design of alloy, by the system of heat treatment process of optimizing, reduce ductile-brittle transition temperature, improve the low-temperature flexibility of steel.Plate property of the present invention is good, and tensile strength is 490 ~ 640MPa, unit elongation >=22%, and-101 ℃ of low-temperature impact >=80J, have excellent low-temperature flexibility.Compared with traditional 3.5Ni low-temperature steel, steel of the present invention not only has excellent low-temperature flexibility, and the content that significantly reduces Ni in steel is more than 1.5% Ni, has obvious cost advantage.
Accompanying drawing explanation
Fig. 1 is that the embodiment 1 of steel of the present invention organizes photo, and tissue is take ferrite bainite as main.
Fig. 2 is that the embodiment 3 of steel of the present invention organizes photo, and tissue is take ferrite bainite as main.
Embodiment
A kind of joint Ni type low temperature steel plate and preparation method thereof, the thermal treatment process that adopts reasonable component design and optimize, guarantees that steel plate Microstructure and properties is even, has obtained the steel plate of-101 ℃ of low temperature performance excellents.In the present invention, the composition of each embodiment is shown in Table 1.
Table 1 steel chemical composition of the present invention (wt.%)
| Embodiment | C | Si | Mn | P | S | Al | Ni | Mo |
| Embodiment 1 | 0.064 | 0.20 | 1.27 | 0.0096 | 0.0016 | 0.029 | 0.97 | 0.07 |
| Embodiment 2 | 0.065 | 0.19 | 1.43 | 0.0084 | 0.0015 | 0.028 | 1.03 | 0.05 |
| Embodiment 3 | 0.070 | 0.22 | 1.35 | 0.0078 | 0.0015 | 0.030 | 0.95 | 0.06 |
Above-mentioned steel billet is rolled after being greater than 1 hour 1180 ℃ of heat-up times.Adopt two-stage control rolling technology, roughing rolling 2-5 passage; Finishing temperature is 780～860 ℃, and rolling 3-7 passage is rolled rear water-cooled to room temperature.Technique is shown in Table 2.
Table 2 heating rolling technique
| Embodiment | Thickness/mm | Tapping temperature/℃ | Rolling pass | Finishing temperature/℃ |
| Embodiment 1 | 12 | 1182 | 4+7 | 858 |
| Embodiment 2 | 20 | 1176 | 3+7 | 847 |
| Embodiment 3 | 35 | 1198 | 3+6 | 841 |
Thermal treatment process is: quench and tempering heat treatment, wherein quenching temperature is 750～850 ℃, and soaking time is 0.5～3 hour, carries out subsequently quenching heat treatment; Tempering temperature is 600～700 ℃, and soaking time is 0.5～5 hour, and after tempering, air cooling is to room temperature.Technique is shown in Table 3.
Table 3 thermal treatment process
| Embodiment | Thickness/mm | Quench | Tempering |
| Embodiment 1 | 12 | 830℃×60min | 660℃×70min |
| Embodiment 2 | 20 | 820℃×75min | 650℃×80min |
| Embodiment 2 | 35 | 810℃×85min | 665℃×90min |
The tensile property of steel plate and Xia Bi v-notch ballistic work after thermal treatment, result is as shown in table 4.From table, steel of the present invention has excellent low-temperature flexibility, more than-101 ℃ of ballistic works can reach 80J.
Table 4 mechanical property
Claims (4)
1. a joint Ni type low temperature steel plate, it is characterized in that: in this joint Ni type low temperature steel plate each composition by weight percentage ratio be: C:0.03～0.8%, Si:0.05 ~ 0.20%, Mn:0.85～1.75%, Ni:0.85～1.25%, Mo :≤0.20%, Al:0.015～0.030%, P :≤0.008%, S :≤0.002%, surplus is Fe and inevitable impurity.
2. joint Ni type low temperature steel plate according to claim 1, is characterized in that: in this joint Ni type low temperature steel plate, contain following one or both alloying elements: Nb:0～0.05%, V:0～0.05%, the total amount of steel interalloy element is not more than 3%.
3. a manufacture method for joint Ni type low temperature steel plate claimed in claim 1, is characterized in that the method comprises the following steps:
1) heating: blank is packed in process furnace and heated, and Heating temperature is 1100-1200 ℃, and the time is greater than 1 hour, is rolled after heating;
2) rolling: roughing rolling 2-5 passage, finish rolling rolling 3-7 passage, finishing temperature is 780～860 ℃, rolls rear water-cooled to room temperature;
3) thermal treatment: quench and tempering heat treatment, wherein quenching temperature is 750～850 ℃, and soaking time is 0.5～3 hour, carries out subsequently quenching heat treatment; Tempering temperature is 600～700 ℃, and soaking time is 0.5～5 hour, and after tempering, air cooling, to room temperature, obtains saving Ni type low temperature steel plate.
4. the manufacture method of joint Ni type low temperature steel plate according to claim 3, is characterized in that: adopt converter or electrosmelting, adopt continuous casting or die casting production rolling blank.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109234625A (en) * | 2018-10-10 | 2019-01-18 | 南京钢铁股份有限公司 | A kind of used at ultra-low temperature steel plate of strain-aging function admirable and preparation method thereof |
| CN110747409A (en) * | 2019-10-30 | 2020-02-04 | 鞍钢股份有限公司 | Low-nickel steel for low-temperature storage tank and manufacturing method thereof |
| CN111590238A (en) * | 2020-05-28 | 2020-08-28 | 南京钢铁股份有限公司 | Ni-saving low-temperature steel submerged-arc welding wire for cryogenic environment and welding process |
| CN113151650A (en) * | 2021-04-10 | 2021-07-23 | 河南科技大学 | Heat treatment process for low alloy steel |
| CN113186466A (en) * | 2021-04-27 | 2021-07-30 | 江苏省沙钢钢铁研究院有限公司 | Low-temperature steel bar and production method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5114815A (en) * | 1974-07-27 | 1976-02-05 | Nippon Steel Corp | Koenseio jusuru kojinseichoshitsukono seizoho |
| CN1840723A (en) * | 2005-03-30 | 2006-10-04 | 宝山钢铁股份有限公司 | Superhigh strength steel plate with yield strength more than 1100Mpa and method for producing same |
| CN101705433A (en) * | 2009-09-29 | 2010-05-12 | 燕山大学 | 196 DEG C below zero ultralow-temperature quake-proof structural steel |
-
2014
- 2014-03-04 CN CN201410076238.2A patent/CN103882294A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5114815A (en) * | 1974-07-27 | 1976-02-05 | Nippon Steel Corp | Koenseio jusuru kojinseichoshitsukono seizoho |
| CN1840723A (en) * | 2005-03-30 | 2006-10-04 | 宝山钢铁股份有限公司 | Superhigh strength steel plate with yield strength more than 1100Mpa and method for producing same |
| CN101705433A (en) * | 2009-09-29 | 2010-05-12 | 燕山大学 | 196 DEG C below zero ultralow-temperature quake-proof structural steel |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109234625A (en) * | 2018-10-10 | 2019-01-18 | 南京钢铁股份有限公司 | A kind of used at ultra-low temperature steel plate of strain-aging function admirable and preparation method thereof |
| CN110747409A (en) * | 2019-10-30 | 2020-02-04 | 鞍钢股份有限公司 | Low-nickel steel for low-temperature storage tank and manufacturing method thereof |
| CN110747409B (en) * | 2019-10-30 | 2021-02-23 | 鞍钢股份有限公司 | Low-nickel steel for low-temperature storage tank and manufacturing method thereof |
| CN111590238A (en) * | 2020-05-28 | 2020-08-28 | 南京钢铁股份有限公司 | Ni-saving low-temperature steel submerged-arc welding wire for cryogenic environment and welding process |
| CN113151650A (en) * | 2021-04-10 | 2021-07-23 | 河南科技大学 | Heat treatment process for low alloy steel |
| CN113186466A (en) * | 2021-04-27 | 2021-07-30 | 江苏省沙钢钢铁研究院有限公司 | Low-temperature steel bar and production method thereof |
| CN113186466B (en) * | 2021-04-27 | 2022-05-17 | 江苏省沙钢钢铁研究院有限公司 | Low-temperature steel bar and production method thereof |
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Application publication date: 20140625 |