CN101787490A - Micro-alloyed steel Q345R - Google Patents
Micro-alloyed steel Q345R Download PDFInfo
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- CN101787490A CN101787490A CN201010133833A CN201010133833A CN101787490A CN 101787490 A CN101787490 A CN 101787490A CN 201010133833 A CN201010133833 A CN 201010133833A CN 201010133833 A CN201010133833 A CN 201010133833A CN 101787490 A CN101787490 A CN 101787490A
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Abstract
The invention discloses micro-alloyed steel Q345R. The following elements in parts by weight are added into steel Q345R with a section 170 and a section 210: 0.018-0.035 of Ti; and the following elements in parts by weight is added into steel Q345R with a section 240: 0.018-0.035 of Ti and 0.020-0.030 of V. According to GB713-2008 Steel Plates for Boiler and Pressure Vessels implemented since September 1, 2008, the pass rate of the final comprehensive performance of the steel plate Q345R produced through micro-alloying treatment is 97.06 percent, and the pass rate deducted abnormal fractures is 98.40 percent, close to the pass rate of 99 percent of the performance of steel 16MnR prior to the implementation of new national standards. Moreover, the pass rate of the hot rolling performance is 95.91 percent, the pass rate deducted abnormal fractures is 98.06 percent, and the pass rate of the normalizing performance is 98.58 percent, which are significantly improved compared with the pass rate of the steel plate Q345R produced in the prior art.
Description
Technical field
The present invention relates to a kind of steel of producing boiler and pressurized vessel, particularly a kind of Q345R steel of microalloying of being mainly used in.
Background technology
In smelting iron and steel, in order to remedy the imperfection of equipment and Technology aspect, when smelting, add non-steel alloy and the low alloy steel of minor N b, V or Ti sometimes, be called the microalloying of steel, do not require the check of making mentioned component during delivery.
According to the new classification of the GB713-2008 " Steel Plates For Boiler And Pressure Vessels " that implemented on September 1st, 2008,16Mng and 16MnR, 19Mng merge into Q345R.Q345R is an ordinary low-alloy steel, the condition of delivery branch: hot rolling or normalizing belong to low alloy steel.(yield strength of 16mm steel plate is greater than 345Mpa) performance of performance and Q345 (16Mn) is close, and tensile strength is between (510-640), and elongation is greater than 21%, and zero degree V-type ballistic work is greater than 34J.The Q345R steel plate is that yield strength is the pressurized vessel personality board of 345MPa level, it has good comprehensive mechanical properties and processing performance, phosphorus, sulphur content are a little less than low-alloy high-strength steel plate Q345 (16Mn) steel, except that tensile strength, unit elongation requirement increase than Q345 (16Mn) steel, also require to guarantee impelling strength.It is the pressurized vessel steel plate special that present China purposes is the widest, consumption is maximum.
In state compulsory standard GB713-2008 " boiler and steel plate of pressure vessel ", the phosphorus of Q345R steel plate, sulphur content require to compare old standard and decrease, product performance require to increase, the 16MnR that produces by prior art only is 91.25% as lower by new standard requirement statistic property qualification rate.
At above-mentioned deficiency, need to explore a kind of Q345R steel plate of microalloying, it is produced can fine adaptation new national standard needs.
Summary of the invention
In view of this, the invention provides a kind of Q345R steel of microalloying,, can effectively improve its strength property and properties percent of pass by microalloying.
The Q345R steel of microalloying of the present invention, the Q345R steel of 170 and 210 sections adds following element: Ti 0.018～0.035 by weight; The Q345R steel of 240 sections adds following element: Ti 0.018～0.035 by weight, and V 0.020～0.030.
Further, the Q345R steel of 170 and 210 sections adds following element: Ti 0.022 by weight; The Q345R steel of 240 sections adds following element: Ti 0.022 by weight, and V 0.025;
Further, described V element is to add by the mode that adds vanadium iron in molten steel;
Further, described vanadium iron adds in converter;
Further, described Ti element is to add by the mode that adds the ferrotianium cored-wire in molten steel;
Further, described ferrotianium cored-wire adds in the LF stove.
The beneficial effect of the invention: the Q345R steel of microalloying of the present invention, the Q345R steel of 170 and 210 sections adds following element: Ti0.018～0.035 by weight; The Q345R steel of 240 sections adds following element: Ti0.018～0.035 by weight, V0.020～0.030, the Q345R steel plate of after above-mentioned Alloying Treatment, producing, requirement according to the GB713-2008 " Steel Plates For Boiler And Pressure Vessels " that implemented on September 1st, 2008, final over-all properties qualification rate is 97.06%, the unusual qualification rate of deduction fracture is 98.40%, the properties percent of pass of carrying out preceding 16MnR steel 99% with new national standard is approaching, wherein, the hot rolling properties percent of pass is 95.91%, and the unusual qualification rate of deduction fracture is 98.06%; The normalizing properties percent of pass is 98.58%, all than the Q345R steel plate qualification rate that adopts prior art to produce remarkable lifting is arranged.
Embodiment
Embodiment 1
The Q345R steel of the microalloying of present embodiment, the Q345R steel of 170 and 210 sections adds following element: Ti 0.018 by weight; The Q345R steel of 240 sections adds following element: Ti 0.018 by weight, and V 0.020.
Described V element is to add by the mode that adds vanadium iron in converter, and described Ti element is to add by the mode that adds the ferrotianium cored-wire in the LF stove.
Q345R steel according to the present embodiment microalloying sees the following form by section and alloying mode statistic property characteristic value with the Q345R steel plate of producing by prior art:
Embodiment 2
The Q345R steel of the microalloying of present embodiment, the Q345R steel of 170 and 210 sections adds following element: Ti 0.022 by weight; The Q345R steel of 240 sections adds following element: Ti 0.022 by weight, and V 0.025.
Described V element is to add by the mode that adds vanadium iron in converter, and described Ti element is to add by the mode that adds the ferrotianium cored-wire in the LF stove.
Q345R steel according to the present embodiment microalloying sees the following form by section and alloying mode statistic property characteristic value with the Q345R steel plate of producing by prior art:
Embodiment 3
The Q345R steel of the microalloying of present embodiment, the Q345R steel of 170 and 210 sections adds following element: Ti 0.035 by weight; The Q345R steel of 240 sections adds following element: Ti 0.035 by weight, and V 0.030.
Described V element is to add by the mode that adds vanadium iron in converter, and described Ti element is to add by the mode that adds the ferrotianium cored-wire in the LF stove.
Q345R steel according to the present embodiment microalloying sees the following form by section and alloying mode statistic property characteristic value with the Q345R steel plate of producing by prior art:
Embodiment 4
The Q345R steel of the microalloying of present embodiment, the Q345R steel of 170 and 210 sections adds following element: Ti 0.030 by weight; The Q345R steel of 240 sections adds following element: Ti 0.018 by weight, and V 0.030.
Described V element is to add by the mode that adds vanadium iron in converter, and described Ti element is to add by the mode that adds the ferrotianium cored-wire in the LF stove.
Q345R steel according to the present embodiment microalloying sees the following form by section and alloying mode statistic property characteristic value with the Q345R steel plate of producing by prior art:
By on can get, having significantly on the basis of existing Q345R rigidity energy through the Q345R of microalloying rigidity of 170 and 210 sections and 240 sections promotes, according to the requirement of GB713-2008 " Steel Plates For Boiler And Pressure Vessels ", can reach more satisfactory qualification rate.
Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (6)
1. the Q345R steel of a microalloying is characterized in that:
The Q345R steel of 170 and 210 sections adds following element: Ti 0.018～0.035 by weight;
The Q345R steel of 240 sections adds following element: Ti 0.018～0.035 by weight, and V 0.020～0.030.
2. the Q345R steel of microalloying according to claim 1 is characterized in that:
The Q345R steel of 170 and 210 sections adds following element: Ti 0.022 by weight;
The Q345R steel of 240 sections adds following element: Ti 0.022 by weight, and V 0.025.
3. the Q345R steel of microalloying according to claim 2 is characterized in that: described V element is to add by the mode that adds vanadium iron in molten steel.
4. the Q345R steel of microalloying according to claim 3, it is characterized in that: described vanadium iron adds in converter.
5. the Q345R steel of microalloying according to claim 4 is characterized in that: described Ti element is to add by the mode that adds the ferrotianium cored-wire in molten steel.
6. the Q345R steel of microalloying according to claim 5, it is characterized in that: described ferrotianium cored-wire adds in the LF stove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201010133833A CN101787490A (en) | 2010-03-26 | 2010-03-26 | Micro-alloyed steel Q345R |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010133833A CN101787490A (en) | 2010-03-26 | 2010-03-26 | Micro-alloyed steel Q345R |
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| CN101787490A true CN101787490A (en) | 2010-07-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112877596A (en) * | 2021-01-06 | 2021-06-01 | 广东韶钢松山股份有限公司 | Method for replacing B in European standard S450J0 steel plate with Cr and method for manufacturing Cr-containing S450J0 steel plate |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101255527A (en) * | 2008-03-17 | 2008-09-03 | 莱芜钢铁股份有限公司 | Boron-modified H-shape steel having well low-temperature impact flexibility and preparation method thereof |
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2010
- 2010-03-26 CN CN201010133833A patent/CN101787490A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101255527A (en) * | 2008-03-17 | 2008-09-03 | 莱芜钢铁股份有限公司 | Boron-modified H-shape steel having well low-temperature impact flexibility and preparation method thereof |
Non-Patent Citations (3)
| Title |
|---|
| 《江苏冶金》 20051031 朱鹏举等 16MnNb中厚钢板控轧工艺的试验研究 25-28 1-6 第33卷, 第5期 2 * |
| 《特殊钢》 20040930 冯运莉等 16Mn钢V(N)微合金化在大规格高强度角钢生产中的应用 41-43 1-6 第25卷, 第5期 2 * |
| 《铸造技术》 20061031 刘胜新等 微合金元素对Q345钢奥氏体晶粒粗化行为的影响 1071-1074 1-6 第27卷, 第10期 2 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112877596A (en) * | 2021-01-06 | 2021-06-01 | 广东韶钢松山股份有限公司 | Method for replacing B in European standard S450J0 steel plate with Cr and method for manufacturing Cr-containing S450J0 steel plate |
| CN112877596B (en) * | 2021-01-06 | 2021-11-16 | 广东韶钢松山股份有限公司 | Method for replacing B in European standard S450J0 steel plate with Cr and method for manufacturing Cr-containing S450J0 steel plate |
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Application publication date: 20100728 |