CN105256248A - Steel plate special for cable bridge and thermal treatment method for steel plate - Google Patents
Steel plate special for cable bridge and thermal treatment method for steel plate Download PDFInfo
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- CN105256248A CN105256248A CN201510769114.7A CN201510769114A CN105256248A CN 105256248 A CN105256248 A CN 105256248A CN 201510769114 A CN201510769114 A CN 201510769114A CN 105256248 A CN105256248 A CN 105256248A
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Abstract
The invention discloses a steel plate special for a cable bridge. The steel plate comprises, by mass, 0.52%-0.66% of C, 3.48%-3.70% of Cr, 0.16%-0.35% of Si, 0.85%-1.50% of Mn, 0-0.015% of P, 0.020%-0.050% of Nb, 0.008%-0.020% of Ti, 0.25%-0.65% of V, 0.11%-0.18% of Mo, 0.15%-0.35% of Al, 0.03%-0.07% of Cu, 0.80%-0.87% of Ni, 1.15%-2.35% of rare earth elements, and the balance Fe and inevitable impurities. The produced high-strength and corrosion-resistant steel plate special for the cable bridge has good transverse yield strength and high plasticity; the yield strength is 1060-1180 MPa, the tensile strength is 1120-1180 MPa, the ductility is 18%-25%, and minus 40 DEG C low-temperature impact energy is larger than or equal to 75 J.
Description
Technical field
The present invention relates to a kind of corrosion-resistant steel and heat treating method thereof, specifically a kind of cable testing bridge steel plate special and heat treating method thereof.
Background technology
Cable testing bridge be mainly used in powering supporting power transmission and line telecommunications the comprehensive wiring such as to pass on, the bracing member of cabling.This bracing member is in supply of electric power department, and the concentrated power transmission system for distribution of industrial and mining enterprises, hotel, comprehensive office facility and line telecommunications etc. are most widely used general.Existing crane span structure base plate mostly is slab construction, and in order to reach the weight of crane span structure carrying cable line, it is very thick that crane span structure base plate thickness usually designs, and materials consumption is serious, and crane span structure own wt is comparatively large, and long-time suspension can bending phenomenon occurs, shortens the work-ing life of crane span structure.Therefore the transverse yield strength and the corrosion resistance that how effectively to improve burglary-resisting window steel are those skilled in the art's technical issues that need to address always.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the shortcoming of prior art, provides a kind of cable testing bridge steel plate special and heat treating method thereof, has strong corrosion resistance, and has excellent transverse yield strength.
The technical scheme that the present invention solves above technical problem is: provide a kind of cable testing bridge steel plate special, it is characterized in that: the composition of described steel and mass percent are: C:0.52 ~ 0.66%, Cr:3.48 ~ 3.70%, Si:0.16 ~ 0.35%, Mn:0.85 ~ 1.50%, P :≤0.015%, Nb:0.020 ~ 0.050%, Ti:0.008 ~ 0.020%, V:0.25 ~ 0.65%, Mo:0.11 ~ 0.18%, Al:0.15 ~ 0.35%, Cu:0.03 ~ 0.07%, Ni:0.80 ~ 0.87%, rare earth element: 1.15 ~ 2.35%, surplus is Fe and inevitable impurity,
The chemical composition mass percentage of described rare earth element is: Nd:8 ~ 12%, Ce:14 ~ 19%, Er:6 ~ 10%, Pr:6 ~ 9%, Pm:8 ~ 14%, Dy:0 ~ 5%, and surplus is La.
The technical scheme that the present invention limits further is: aforesaid cable testing bridge steel plate special, and the yield strength of described steel is 1060 ~ 1180MPa, and tensile strength is 1120 ~ 1180MPa, and unit elongation is 18 ~ 25% ,-40 DEG C of low-temperature impact >=75J.
Aforesaid cable testing bridge steel plate special, the composition of described steel plate and mass percent are: C:0.52%, Cr:3.48%, Si:0.16%, Mn:0.85%, P:0.015%, Nb:0.020%, Ti:0.008%, V:0.35%, Mo:0.11%, Al:0.15%, Cu:0.03%, Ni:0.80%, rare earth element: 1.15%, surplus is Fe and inevitable impurity;
The chemical composition mass percentage of described rare earth element is: Nd:8%, Ce:14, Er:6%, Pr:6%, Pm:8%, and surplus is La.
Aforesaid burglary-resisting window framework Special high-strength corrosion-resistant steel, the composition of described steel plate and mass percent are: C:0.64%, Cr:3.56%, Si:0.25%, Mn:1.1%, P:0.015%, Nb:0.041%, Ti:0.015%, V:0.65%, Mo:0.15%, Al:0.21%, Cu:0.05%, Ni:0.82%, rare earth element: 2.25%, surplus is Fe and inevitable impurity;
The chemical composition mass percentage of described rare earth element is: Nd:11%, Ce:15%, Er:8%, Pr:7%, Pm:11%, Dy:2%, and surplus is La.
A heat treating method for cable testing bridge steel plate special, comprises following steps:
(i) heat after steel air cooling good for rolling again, Heating temperature 1060 ~ 1150 DEG C;
(ii) carry out austenite phase field quench treatment, quenching temperature is at 890 ~ 950 DEG C, and Quenching Soaking Time is 1.5min/mm × thickness of slab, and after quenching, steel obtain uniform hardening lath martensite, and original austenite grains is tiny;
(iii) 580 ~ 630 DEG C of tempering after quenching, tempering adopts water-cooled to be combined with air cooling, first adopt water-cooled, with the rate of cooling of 7-9 DEG C/s, stainless steel water is chilled to 420-450 DEG C, then air cooling is to 350-370 DEG C, then adopts water-cooled, with the rate of cooling of 4-6 DEG C/s, stainless steel water is chilled to room temperature.
The invention has the beneficial effects as follows:
The effect that in high-strength corrosion-resistant steel composition of the present invention, the control of each constituent content is played is: the present invention adds rare-earth elements of lanthanum, cerium and praseodymium, and add martensitic stucture by austenite can be obtained in conjunction with thermal treatment process, in this stainless steel, first-phase is austenite, second-phase is martensite, at thickness place, surface to 1/4, second-phase percent by volume is 4.1-4.3%, and 1/4 thickness is 6.3-6.5% to center second-phase percent by volume; Thus successfully produce cable testing bridge Special high-strength corrosion-resistant steel, have good transverse yield strength and high-ductility, yield strength is 1060 ~ 1180MPa, and tensile strength is 1120 ~ 1180MPa, and unit elongation is 18 ~ 25% ,-40 DEG C of low-temperature impact >=75J.
The effect that thermal treatment control of the present invention plays is: by heat treated control, obtain rational two-phase when fine austenite add martensitic stucture, stainless steel is 4.5-4.7 μm at thickness place, surface to 1/4 austenite average crystal grain diameter, martensite average crystal grain diameter is 3.0-3.2 μm, 1/4 thickness is 7.0-7.2 μm to center austenite average crystal grain diameter, martensite average crystal grain diameter is 9.0-9.2 μm, thus improve thickness directional properties and low-temperature flexibility and improve corrosion resistance, thus control effectively to improve stainless corrosion resistance by microtexture.
Embodiment
Below in conjunction with specific embodiment, technical scheme of the present invention is described in further detail, but protection scope of the present invention is not limited thereto.
embodiment 1
The present embodiment is a kind of cable testing bridge steel plate special, and the composition of described steel plate and mass percent are: C:0.52%, Cr:3.48%, Si:0.16%, Mn:0.85%, P:0.015%, Nb:0.020%, Ti:0.008%, V:0.35%, Mo:0.11%, Al:0.15%, Cu:0.03%, Ni:0.80%, rare earth element: 1.15%, surplus is Fe and inevitable impurity;
The chemical composition mass percentage of rare earth element is: Nd:8%, Ce:14, Er:6%, Pr:6%, Pm:8%, and surplus is La.
The heat treating method of the cable testing bridge steel plate special that the present embodiment provides, comprises following steps:
(i) heat after steel air cooling good for rolling again, Heating temperature 1060 ~ 1150 DEG C;
(ii) carry out austenite phase field quench treatment, quenching temperature is at 890 ~ 950 DEG C, and Quenching Soaking Time is 1.5min/mm × thickness of slab, and after quenching, steel obtain uniform hardening lath martensite, and original austenite grains is tiny;
(iii) 580 ~ 630 DEG C of tempering after quenching, tempering adopts water-cooled to be combined with air cooling, first adopt water-cooled, with the rate of cooling of 7-9 DEG C/s, stainless steel water is chilled to 420-450 DEG C, then air cooling is to 350-370 DEG C, then adopts water-cooled, with the rate of cooling of 4-6 DEG C/s, stainless steel water is chilled to room temperature.
embodiment 2
The present embodiment is a kind of burglary-resisting window framework Special high-strength corrosion-resistant steel, and the composition of described steel plate and mass percent are: C:0.64%, Cr:3.56%, Si:0.25%, Mn:1.1%, P:0.015%, Nb:0.041%, Ti:0.015%, V:0.65%, Mo:0.15%, Al:0.21%, Cu:0.05%, Ni:0.82%, rare earth element: 2.25%, surplus is Fe and inevitable impurity;
The chemical composition mass percentage of described rare earth element is: Nd:11%, Ce:15%, Er:8%, Pr:7%, Pm:11%, Dy:2%, and surplus is La.
The heat treating method of the burglary-resisting window framework Special high-strength corrosion-resistant steel that the present embodiment provides, comprises following steps:
(i) heat after steel air cooling good for rolling again, Heating temperature 1060 ~ 1150 DEG C;
(ii) carry out austenite phase field quench treatment, quenching temperature is at 890 ~ 950 DEG C, and Quenching Soaking Time is 1.5min/mm × thickness of slab, and after quenching, steel obtain uniform hardening lath martensite, and original austenite grains is tiny;
(iii) 580 ~ 630 DEG C of tempering after quenching, tempering adopts water-cooled to be combined with air cooling, first adopt water-cooled, with the rate of cooling of 7-9 DEG C/s, stainless steel water is chilled to 420-450 DEG C, then air cooling is to 350-370 DEG C, then adopts water-cooled, with the rate of cooling of 4-6 DEG C/s, stainless steel water is chilled to room temperature.
The stainless performance of each embodiment is as shown in table 1.
The stainless performance of each embodiment of table 1
| Embodiment | Tensile strength, MPa | Yield strength, MPa | Unit elongation, % | -40 DEG C of Charpy-V impact powers, J | CLR, % | CTR, % | CSR,% | SSC |
| Embodiment 1 | 1147 | 1160 | 19 | 125 | 0 | 0 | 0 | Flawless |
| Embodiment 2 | 1127 | 1099 | 24 | 106 | 0 | 0 | 0 | Flawless |
As seen from the above table, stainless steel of the present invention has good intensity, plasticity and low-temperature flexibility, Properties of HIC resistance and anti-SSC performance.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (5)
1. a cable testing bridge steel plate special, it is characterized in that: the composition of described steel and mass percent are: C:0.52 ~ 0.66%, Cr:3.48 ~ 3.70%, Si:0.16 ~ 0.35%, Mn:0.85 ~ 1.50%, P :≤0.015%, Nb:0.020 ~ 0.050%, Ti:0.008 ~ 0.020%, V:0.25 ~ 0.65%, Mo:0.11 ~ 0.18%, Al:0.15 ~ 0.35%, Cu:0.03 ~ 0.07%, Ni:0.80 ~ 0.87%, rare earth element: 1.15 ~ 2.35%, surplus is Fe and inevitable impurity;
The chemical composition mass percentage of described rare earth element is: Nd:8 ~ 12%, Ce:14 ~ 19%, Er:6 ~ 10%, Pr:6 ~ 9%, Pm:8 ~ 14%, Dy:0 ~ 5%, and surplus is La.
2. cable testing bridge steel plate special as claimed in claim 1, is characterized in that: the yield strength of described steel is 1060 ~ 1180MPa, and tensile strength is 1120 ~ 1180MPa, and unit elongation is 18 ~ 25% ,-40 DEG C of low-temperature impact >=75J.
3. cable testing bridge steel plate special as claimed in claim 1, is characterized in that: the composition of described steel plate and mass percent are: C:0.52%, Cr:3.48%, Si:0.16%, Mn:0.85%, P:0.015%, Nb:0.020%, Ti:0.008%, V:0.35%, Mo:0.11%, Al:0.15%, Cu:0.03%, Ni:0.80%, rare earth element: 1.15%, surplus is Fe and inevitable impurity;
The chemical composition mass percentage of described rare earth element is: Nd:8%, Ce:14, Er:6%, Pr:6%, Pm:8%, and surplus is La.
4. burglary-resisting window framework Special high-strength corrosion-resistant steel as claimed in claim 1, is characterized in that: the composition of described steel plate and mass percent are: C:0.64%, Cr:3.56%, Si:0.25%, Mn:1.1%, P:0.015%, Nb:0.041%, Ti:0.015%, V:0.65%, Mo:0.15%, Al:0.21%, Cu:0.05%, Ni:0.82%, rare earth element: 2.25%, surplus is Fe and inevitable impurity;
The chemical composition mass percentage of described rare earth element is: Nd:11%, Ce:15%, Er:8%, Pr:7%, Pm:11%, Dy:2%, and surplus is La.
5. the heat treating method of the cable testing bridge steel plate special as described in claim arbitrary in claim 1-4, comprises following steps:
(i) heat after steel air cooling good for rolling again, Heating temperature 1060 ~ 1150 DEG C;
(ii) carry out austenite phase field quench treatment, quenching temperature is at 890 ~ 950 DEG C, and Quenching Soaking Time is 1.5min/mm × thickness of slab, and after quenching, steel obtain uniform hardening lath martensite, and original austenite grains is tiny;
(iii) 580 ~ 630 DEG C of tempering after quenching, tempering adopts water-cooled to be combined with air cooling, first adopt water-cooled, with the rate of cooling of 7-9 DEG C/s, stainless steel water is chilled to 420-450 DEG C, then air cooling is to 350-370 DEG C, then adopts water-cooled, with the rate of cooling of 4-6 DEG C/s, stainless steel water is chilled to room temperature.
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| CN201510769114.7A CN105256248A (en) | 2015-11-12 | 2015-11-12 | Steel plate special for cable bridge and thermal treatment method for steel plate |
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| CN201510769114.7A CN105256248A (en) | 2015-11-12 | 2015-11-12 | Steel plate special for cable bridge and thermal treatment method for steel plate |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108913977A (en) * | 2018-06-15 | 2018-11-30 | 荣马电器有限公司 | A kind of composite material cable slot box |
| CN109066512A (en) * | 2018-09-10 | 2018-12-21 | 镇江朝阳机电科技有限公司 | A kind of adjustable cable gantry and preparation method thereof |
| CN109055872A (en) * | 2018-09-07 | 2018-12-21 | 镇江朝阳机电科技有限公司 | A kind of cable testing bridge of heat-and corrosion-resistant |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004084068A (en) * | 2002-06-26 | 2004-03-18 | Nippon Steel Corp | Non-haettreated low yield ratio high tensile strength steel having excellent high temperature strength and production method therefor |
| CN103443302A (en) * | 2011-03-18 | 2013-12-11 | 新日铁住金株式会社 | Steel pipe quenching method |
| CN104694834A (en) * | 2015-03-20 | 2015-06-10 | 苏州市神龙门窗有限公司 | High-strength corrosion resistant steel special for anti-theft window frame and thermal treatment method thereof |
-
2015
- 2015-11-12 CN CN201510769114.7A patent/CN105256248A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004084068A (en) * | 2002-06-26 | 2004-03-18 | Nippon Steel Corp | Non-haettreated low yield ratio high tensile strength steel having excellent high temperature strength and production method therefor |
| CN103443302A (en) * | 2011-03-18 | 2013-12-11 | 新日铁住金株式会社 | Steel pipe quenching method |
| CN104694834A (en) * | 2015-03-20 | 2015-06-10 | 苏州市神龙门窗有限公司 | High-strength corrosion resistant steel special for anti-theft window frame and thermal treatment method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108913977A (en) * | 2018-06-15 | 2018-11-30 | 荣马电器有限公司 | A kind of composite material cable slot box |
| CN109055872A (en) * | 2018-09-07 | 2018-12-21 | 镇江朝阳机电科技有限公司 | A kind of cable testing bridge of heat-and corrosion-resistant |
| CN109066512A (en) * | 2018-09-10 | 2018-12-21 | 镇江朝阳机电科技有限公司 | A kind of adjustable cable gantry and preparation method thereof |
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