CN103774050A - High-ductility steel with low yield ratio - Google Patents
High-ductility steel with low yield ratio Download PDFInfo
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- CN103774050A CN103774050A CN201210412272.3A CN201210412272A CN103774050A CN 103774050 A CN103774050 A CN 103774050A CN 201210412272 A CN201210412272 A CN 201210412272A CN 103774050 A CN103774050 A CN 103774050A
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Abstract
The invention discloses a high-ductility steel with low yield ratio. The high-ductility steel comprises the following chemical ingredients in percentage by weight: 0.07-0.09% of C, 0.15-0.20% of Si, 1.30-1.50% of Mn, less than or equal to 0.008% of P, less than or equal to 0.004% of S, 0.010-0.015% of Ti, 0.10-0.20% of Cr, 0.15-0.20% of Ni, 0.20-0.25% of Cu, 0.025-0.030% of Al, and the balance of Fe and inevitable impurities. The high-ductility steel with low yield ratio adopts the controlled rolling and controlled cooling process to obtain a bainite structure. Due to the technology for heating processing, an ultra-fine grain structure is obtained, so that the material has the advantages of low yield ratio, superplasticity, high strength and the like.
Description
Technical field
The present invention relates to a kind of high-strength steel, specifically a kind of low yield strength ratio high-ductility steel.
Background technology
Along with society and expanding economy, Iron And Steel Industry is faced with three large pressure of saving resource, save energy, protection of the environment.Therefore, improve steel product quality, reduce costs, increase substantially its comprehensive mechanical property, become the main direction of ferrous materials research.
Conventionally, the yield strength of steel and tensile strength are directly proportional to-1/2 power of crystal grain diameter d, and grain refining significantly improves the yield strength and the tensile strength that make steel.The rising of yield tensile ratio significantly declines the cold forming capability that causes steel.Thereby, high-yield-ratio, inductile be existing Ultra-fine Grained production technology still need solve a difficult problem.
Summary of the invention
The object of this invention is to provide a kind of low yield strength ratio high-ductility steel.By the micro-alloy low-carbon steel of this art breading, yield tensile ratio is low, plasticity is high, intensity is high.
The object of the invention is to be achieved through the following technical solutions:
A kind of low yield strength ratio high-ductility steel, it is characterized in that: in this steel, chemical composition is by weight percentage: C:0.07～0.09%, Si:0.15～0.20%, Mn:1.30～1.50%, P :≤0.008%, S :≤0.004%, Ti:0.010～0.015%, Cr:0.10～0.20%, Ni:0.15～0.20%, Cu:0.20～0.25%, Al:0.025～0.030%, surplus is Fe and inevitable impurity.
In the present invention, the alloying elements such as Ti, Cr, Ni mainly play strengthening effect.
The present invention improves yield strength and the tensile strength of steel plate by microalloying and controlled rolling and controlled cooling, by two-phase region quench or tempering increase precipitate separate out probability, obtain uniform ultra-fine grained ferrite structure, make material there is the characteristics such as low yield strength ratio, superplasticity, high strength.Stable processing technique, workable, cost is low, the material excellent combination property of acquisition.
Embodiment
Embodiment 1
A kind of low yield strength ratio high-ductility steel, in this steel, chemical composition is by weight percentage: C:0.07%, Si:0.18%, Mn:1.30%, P:0.008%, S:0.004%, Ti:0.011%, Cr:0.10%, Ni:0.15%, Cu:0.20%, Al:0.025%, surplus is Fe and inevitable impurity.
The rolling technology of low yield strength ratio high-ductility steel: adopt a cooling controlling and rolling controlling process, rolling front continuous blank heating temperature is 1180 ℃～1200 ℃; Adopt austenite recrystallization district and the two-stage control rolling of austenite non-recrystallization district, every time draft 10～15% of roughing, 1000～1050 ℃ of roughing finishing temperatures, roughing becomes the intermediate blank of 1.6 ~ 2.0 times of finished product thicknesses; Finish rolling start rolling temperature is 850～870 ℃, and every time draft is 10～15%, 800～830 ℃ of finish rolling finishing temperatures; Roll rear employing laminar flow cooling, 550～630 ℃ of final cooling temperatures, 7～10 ℃/s of rate of cooling, air cooling subsequently; Carrying out TMCP in hot rolling workshop, to be rolled into 21mm thick, obtains bainite structure.
Embodiment 2
A kind of low yield strength ratio high-ductility steel, in this steel, chemical composition is by weight percentage: C:0.09%, Si:0.20%, Mn:1.50%, P:0.008%, S:0.005%, Ti:0.015%, Cr:0.20%, Ni:0.18%, Cu:0.25%, Al:0.030%, surplus is Fe and inevitable impurity.
Rolling technology is with embodiment 1.
In the present invention, the mechanical property of embodiment 1 and 2 is in table 1:
Table 1
The present invention improves yield strength and the tensile strength of steel plate by microalloying and controlled rolling and controlled cooling, by two-phase region quench increase precipitate separate out probability, obtain uniform ultra-fine grained ferrite structure, make material there is the characteristics such as low yield strength ratio, superplasticity, high strength.Stable processing technique, workable, cost is low, the material excellent combination property of acquisition.
Claims (1)
1. a low yield strength ratio high-ductility steel, it is characterized in that: in this steel, chemical composition is by weight percentage: C:0.07～0.09%, Si:0.15～0.20%, Mn:1.30～1.50%, P :≤0.008%, S :≤0.004%, Ti:0.010～0.015%, Cr:0.10～0.20%, Ni:0.15～0.20%, Cu:0.20～0.25%, Al:0.025～0.030%, surplus is Fe and inevitable impurity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210412272.3A CN103774050A (en) | 2012-10-25 | 2012-10-25 | High-ductility steel with low yield ratio |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210412272.3A CN103774050A (en) | 2012-10-25 | 2012-10-25 | High-ductility steel with low yield ratio |
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| CN103774050A true CN103774050A (en) | 2014-05-07 |
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| CN201210412272.3A Pending CN103774050A (en) | 2012-10-25 | 2012-10-25 | High-ductility steel with low yield ratio |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108474082A (en) * | 2015-12-23 | 2018-08-31 | Posco公司 | The high manganese steel sheet and its manufacturing method of vibrationproof excellent |
| CN114892081A (en) * | 2022-04-28 | 2022-08-12 | 湖南华菱湘潭钢铁有限公司 | Large-thickness 460 MPa-grade steel plate with excellent low-temperature toughness for ocean engineering and production method thereof |
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2012
- 2012-10-25 CN CN201210412272.3A patent/CN103774050A/en active Pending
Patent Citations (12)
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| JPH10306316A (en) * | 1997-04-28 | 1998-11-17 | Nippon Steel Corp | Production of low yield ratio high tensile-strength steel excellent in low temperature toughness |
| JP2005048224A (en) * | 2003-07-31 | 2005-02-24 | Jfe Steel Kk | Method for producing low yield ratio, high strength and high toughness steel plate excellent in weld heat affected zone toughness |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108474082A (en) * | 2015-12-23 | 2018-08-31 | Posco公司 | The high manganese steel sheet and its manufacturing method of vibrationproof excellent |
| CN114892081A (en) * | 2022-04-28 | 2022-08-12 | 湖南华菱湘潭钢铁有限公司 | Large-thickness 460 MPa-grade steel plate with excellent low-temperature toughness for ocean engineering and production method thereof |
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Application publication date: 20140507 |