CN105543668A - Reinforcing bar for ultralow temperature environments - Google Patents

Reinforcing bar for ultralow temperature environments Download PDF

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Publication number
CN105543668A
CN105543668A CN201610036635.6A CN201610036635A CN105543668A CN 105543668 A CN105543668 A CN 105543668A CN 201610036635 A CN201610036635 A CN 201610036635A CN 105543668 A CN105543668 A CN 105543668A
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CN
China
Prior art keywords
reinforcing bar
low temperature
ultra
temperature environments
temperature
Prior art date
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Pending
Application number
CN201610036635.6A
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Chinese (zh)
Inventor
王剑平
王雪峰
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Guangxi Congxin Industry Co Ltd
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Guangxi Congxin Industry Co Ltd
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Priority to CN201610036635.6A priority Critical patent/CN105543668A/en
Publication of CN105543668A publication Critical patent/CN105543668A/en
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention discloses a reinforcing bar for ultralow temperature environments and relates to the technical field of reinforcing bars. The reinforcing bar comprises the following chemical components in percentage by weight: 0.04-0.07% of C, 0.18-0.3% of Si, 0.8-1.5% of Mn, less than or equal to 0.005% of S, less than or equal to 0.008% of P, 5-7.5% of Ni, 0.01-0.03% of Ti, 0.01-0.03% of Nb, 0.1-0.25% of Cu, 0.02-0.04% of Al, 0.003-0.0066% of N, 0.001-0.005% of Ca and the balance being Fe and inevitable impurities. The reinforcing bar solves the problem that a conventional low-temperature resistant reinforcing bar has a relatively poor low temperature property under the ultralow temperature environments of below minus 165 DEG C.

Description

For the reinforcing bar of ultra-low temperature surroundings
Technical field
The present invention relates to reinforcing bar technical field, especially a kind of reinforcing bar for ultra-low temperature surroundings.
Background technology
Reinforcing bar is the Constructional Steel be widely used in modern various building structure, the kind of reinforcing bar is a lot, the reinforcing bar of respective performances should need be used according to different engineering demands, wherein, low temperature resistant reinforcing bar is mainly used in the skeleton construction that construction project under the civil engineering construction of severe cold area, low temperature ocean environment and LNG tank engineering build etc.At present, the domestic reinforcing bar for low temperature environment depends on the low temperature resistant special reinforced of import, cost is higher, and existing low temperature resistant reinforcement yielding intensity is lower than 500MPa, maximum, force downward-extension rate is about 5%, cannot meet the Low temperature property requirements required for the ultra-low temperature surroundings below-165 DEG C.
Summary of the invention
The object of this invention is to provide a kind of reinforcing bar for ultra-low temperature surroundings, it can solve the lower problem of the low-temperature performance of the ultra-low temperature surroundings of existing low temperature resistant reinforcing bar below-165 DEG C.
In order to solve the problem, the technical solution used in the present invention is: a kind of reinforcing bar for ultra-low temperature surroundings comprises the chemical composition of following mass percentage: C0.04-0.07%, Si0.18-0.3%, Mn0.8-1.5%, S≤0.005%, P≤0.008%, Ni5-7.5%, Ti0.01-0.03%, Nb0.01-0.03%, Cu0.1-0.25%, Al0.02-0.04%, N0.003-0.0066%, Ca0.001-0.005%, all the other are Fe and inevitable impurity.
In the technical scheme of the above-mentioned reinforcing bar for ultra-low temperature surroundings, technical scheme can also be more specifically: C0.052%, Si0.25%, Mn1.25%, S0.002%, P0.005%, Ni6.8%, Ti0.02%, Nb0.02%, Cu0.18%, Al0.03%, N0.004%, Ca0.004%, all the other are Fe and inevitable impurity.
Further, C0.04%, Si0.18%, Mn0.8%, S0.005%, P0.006%, Ni5%, Ti0.03%, Nb0.01%, Cu0.1%, Al0.04%, N0.003%, Ca0.005%, all the other are Fe and inevitable impurity.
Further, C0.07%, Si0.3%, Mn1.5%, S0.005%, P0.008%, Ni7.5%, Ti0.01%, Nb0.03%, Cu0.25%, Al0.02%, N0.0066%, Ca0.001%, all the other are Fe and inevitable impurity.
Owing to have employed technique scheme, the present invention compared with prior art has following beneficial effect: C controls within 0.07%, can avoid the toughness and the welding property that reduce steel; Mn, Si significantly can increase the intensity of steel, and control Mn content, is conducive to the welding property improving steel, and improves toughness; Control S, P content, can reduce the impelling strength of steel under ultra-low temperature surroundings and the infringement of welding property as far as possible; Ni can improve the intensity of steel, and makes steel obtain excellent low-temperature flexibility; Ti and N can improve the toughness of steel, reduces the cold shortness of steel; Add the intensity that Nb can significantly improve steel, add the corrosion resistance nature that Cu, Ca can significantly improve steel; Al and N forms AlN and forms crystal grain thinning, improves intensity, also can improve the corrosion resistance nature of steel simultaneously; The yield strength of reinforcing bar reaches more than 560MPa, and tensile strength is at more than 670MPa, and elongation is greater than 10%, and under the maximum, force at-180 DEG C, percentage of total elongation is more than or equal to 6%.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail:
Embodiment 1
The reinforcing bar for ultra-low temperature surroundings of the present embodiment comprises the chemical composition of following mass percentage: C0.052%, Si0.25%, Mn1.25%, S0.002%, P0.005%, Ni6.8%, Ti0.02%, Nb0.02%, Cu0.18%, Al0.03%, N0.004%, Ca0.004%, all the other are Fe and inevitable impurity.
During production, converter is adopted to smelt by above-mentioned chemical composition, after external refining, continuous casting steel billet, sends into steel billet in process furnace and heats, be rolled, send cold bed natural air cooling to room temperature after rolling, carry out Quench and temper process to the reinforcing bar of cooling, quenching temperature is 920 DEG C, and tempering temperature is 600 DEG C.
The room-temperature property of reinforcing bar that the present embodiment is used for ultra-low temperature surroundings is as follows: yield strength 589MPa, tensile strength at 693MPa, elongation after fracture 12.8%; 180 DEG C of low-temperature performancies are as follows: yield strength 746MPa, percentage of total elongation 7% under maximum, force.
Embodiment 2
The reinforcing bar for ultra-low temperature surroundings of the present embodiment comprises the chemical composition of following mass percentage: C0.04%, Si0.18%, Mn0.8%, S0.005%, P0.006%, Ni5%, Ti0.03%, Nb0.01%, Cu0.1%, Al0.04%, N0.003%, Ca0.005%, all the other are Fe and inevitable impurity.
During production, converter is adopted to smelt by above-mentioned chemical composition, after external refining, continuous casting steel billet, sends into steel billet in process furnace and heats, be rolled, send cold bed natural air cooling to room temperature after rolling, carry out Quench and temper process to the reinforcing bar of cooling, quenching temperature is 920 DEG C, and tempering temperature is 600 DEG C.
The room-temperature property of reinforcing bar that the present embodiment is used for ultra-low temperature surroundings is as follows: yield strength 575MPa, tensile strength at 672MPa, elongation after fracture 11.7%; 180 DEG C of low-temperature performancies are as follows: yield strength 728MPa, percentage of total elongation 6.5% under maximum, force.
Embodiment 3
The reinforcing bar for ultra-low temperature surroundings of the present embodiment comprises the chemical composition of following mass percentage: C0.07%, Si0.3%, Mn1.5%, S0.005%, P0.008%, Ni7.5%, Ti0.01%, Nb0.03%, Cu0.25%, Al0.02%, N0.0066%, Ca0.001%, all the other are Fe and inevitable impurity.
During production, converter is adopted to smelt by above-mentioned chemical composition, after external refining, continuous casting steel billet, sends into steel billet in process furnace and heats, be rolled, send cold bed natural air cooling to room temperature after rolling, carry out Quench and temper process to the reinforcing bar of cooling, quenching temperature is 920 DEG C, and tempering temperature is 600 DEG C.
The room-temperature property of reinforcing bar that the present embodiment is used for ultra-low temperature surroundings is as follows: yield strength 562MPa, tensile strength at 681MPa, elongation after fracture 10.2%; 180 DEG C of low-temperature performancies are as follows: yield strength 712MPa, percentage of total elongation 6% under maximum, force.

Claims (4)

1., for a reinforcing bar for ultra-low temperature surroundings, it is characterized in that the chemical composition comprising following mass percentage: C0.04-0.07%, Si0.18-0.3%, Mn0.8-1.5%, S≤0.005%, P≤0.008%, Ni5-7.5%, Ti0.01-0.03%, Nb0.01-0.03%, Cu0.1-0.25%, Al0.02-0.04%, N0.003-0.0066%, Ca0.001-0.005%, all the other are Fe and inevitable impurity.
2. the reinforcing bar for ultra-low temperature surroundings according to claim 1, is characterized in that: C0.052%, Si0.25%, Mn1.25%, S0.002%, P0.005%, Ni6.8%, Ti0.02%, Nb0.02%, Cu0.18%, Al0.03%, N0.004%, Ca0.004%, all the other are Fe and inevitable impurity.
3. the reinforcing bar for ultra-low temperature surroundings according to claim 1, is characterized in that: C0.04%, Si0.18%, Mn0.8%, S0.005%, P0.006%, Ni5%, Ti0.03%, Nb0.01%, Cu0.1%, Al0.04%, N0.003%, Ca0.005%, all the other are Fe and inevitable impurity.
4. the reinforcing bar for ultra-low temperature surroundings according to claim 1, is characterized in that: C0.07%, Si0.3%, Mn1.5%, S0.005%, P0.008%, Ni7.5%, Ti0.01%, Nb0.03%, Cu0.25%, Al0.02%, N0.0066%, Ca0.001%, all the other are Fe and inevitable impurity.
CN201610036635.6A 2016-01-20 2016-01-20 Reinforcing bar for ultralow temperature environments Pending CN105543668A (en)

Priority Applications (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113832321A (en) * 2021-08-27 2021-12-24 马鞍山钢铁股份有限公司 Aluminum-treated high-corrosion-resistance steel bar for 500 MPa-grade ocean island concrete engineering and production method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103103441A (en) * 2013-02-06 2013-05-15 武汉钢铁(集团)公司 Pressure container steel with high toughness at -140 DEG C and production method thereof
CN104018081A (en) * 2014-06-25 2014-09-03 武汉钢铁(集团)公司 Low-temperature resistant special steel bar and production method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103103441A (en) * 2013-02-06 2013-05-15 武汉钢铁(集团)公司 Pressure container steel with high toughness at -140 DEG C and production method thereof
CN104018081A (en) * 2014-06-25 2014-09-03 武汉钢铁(集团)公司 Low-temperature resistant special steel bar and production method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113832321A (en) * 2021-08-27 2021-12-24 马鞍山钢铁股份有限公司 Aluminum-treated high-corrosion-resistance steel bar for 500 MPa-grade ocean island concrete engineering and production method thereof

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