CN104195425A - High-nitrogen ferrite pearlite steel - Google Patents
High-nitrogen ferrite pearlite steel Download PDFInfo
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- CN104195425A CN104195425A CN201410453848.XA CN201410453848A CN104195425A CN 104195425 A CN104195425 A CN 104195425A CN 201410453848 A CN201410453848 A CN 201410453848A CN 104195425 A CN104195425 A CN 104195425A
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Abstract
The invention discloses a high-nitrogen ferrite pearlite steel and belongs to the field of metal materials. The high-nitrogen ferrite pearlite steel comprises the following components in percentage by weight: less than or equal to 0.35% of C, 0.3-0.8% of Si, 0.60-1.60% of Mn, less than or equal to 0.045% of P, less than or equal to 0.035% of S, more than or equal to 120ppm and less than or equal to 300ppm of N, less than or equal to 0.15% of microalloy elements of V, Nb and the like which are properly added according to the comprehensive performance requirement of the steel, and the balance of Fe and impurities. The strength and yielding-to-strength ratio of the high-nitrogen ferrite pearlite steel are higher than those of a common ferrite pearlite steel. The high-nitrogen ferrite pearlite steel has the advantages of dispensing with all technological measures adopted in nitrogen removal of steel melting process, improving the tensile strength and yielding-to-strength ratio of the steel by utilizing low-cost nitrogen reinforcement steel, and being simple in technology and low in cost.
Description
Technical field
The invention belongs to metal material field, particularly relate to a kind of high nitrogen ferritic-pearlitic steel.
Background technology
Conventionally, nitrogen is regarded as a kind of harmful element in steel.In steel, nomadic nitrogen has disadvantageous effect to the aging performance of steel.Yet, at the links of steel-making, as inhaled nitrogen in molten iron, steel scrap, electric-arc heating, tapping process, all can cause nitrogen in steel content to increase.In order to reduce nitrogen in steel content, often need to take several steps, take converter steel as example, use high purity oxygen gas, improve keeping intensity, reduce furnace port diameter, reduce and use the methods such as steel scrap that nitrogen content is high to reduce nitrogen content.
Along with the successful Application of high nitrogen stainless steel, nitrogen, as the effect of alloying element, more and more comes into one's own.Research shows, nitrogen, as the interstitial atom in steel, is compared with carbon, and nitrogen is a kind of more effective solution strengthening element, with other alloying elements synergies, can improve the multiple performance of steel.For example crystal grain thinning, increases steel strength, improves matrix surface performance and improves corrosion resisting property.
The strengthening effect of nitrogen is widespread use in stainless steel, rapid tool steel, die steel.Yet about high nitrogen, the research in ferritic-pearlitic steel is less both at home and abroad, the patent of relevant high nitrogen ferritic-pearlitic steel is in blank.
Summary of the invention
The object of the invention is to provide a kind of composition range of high nitrogen ferritic-pearlitic steel, adopt the performance of ferritic-pearlitic steel of high nitrogen design higher than common ferritic-pearlitic steel.
To achieve these goals, the technical solution used in the present invention is:
For ferrite+perlitic steel, composition range of the present invention, counts according to weight percent: C :≤0.35%, Si:0.3～0.8%, Mn:0.60～1.60, P≤0.045%, S≤0.035%, 120ppm≤N≤300ppm, according to the requirement of steel over-all properties, can add in right amount the microalloy elements such as V, Nb, microalloy element total amount is no more than 0.15%, and all the other are Fe and impurity element.
The invention has the advantages that: adopt the ferrite+perlitic steel of this composition range, exempted every technical measures that in steelmaking process, denitrogenation is taked, reduce costs, the intensity of steel improves, and strong flexor ratio improves.
Accompanying drawing explanation
Fig. 1 is that ferrite+perlitic steel is organized photo.
Specific embodiment
Embodiment 1
Chemical composition proportioning, by weight percentage: C:0.20, Si:0.40, Mn:1.38, P≤0.035, S≤0.035, Nb:0.020, N:120ppm, other are Fe.
Embodiment 2
Chemical composition proportioning, by weight percentage: C:0.22, Si:0.36, Mn:1.42, P≤0.035, S≤0.035, Nb:0.021, V:0.02, N:200ppm, other are Fe.
Embodiment 3
Chemical composition proportioning, by weight percentage: C:0.25, Si:0.62, Mn:1.51, P≤0.035, S≤0.035, V:0.09, N:210ppm, other are Fe.
Embodiment 4
Chemical composition proportioning, by weight percentage: C:0.15, Si:0.40, Mn:1.20, P≤0.035, S≤0.035, V:0.05, N:140ppm, other are Fe.
Embodiment 5
Chemical composition proportioning, by weight percentage: C:0.28, Si:0.55, Mn:1.46, P≤0.035, S≤0.035, V:0.04, N:160ppm, other are Fe.
Embodiment 6
Chemical composition proportioning, by weight percentage: C:0.35, Si:0.45, Mn:1.48, V:0.12, P≤0.035, S≤0.035, N:290ppm, other are Fe.
Table 1
The nitrogen content of the described invention steel of upper table is significantly higher than compared steel.
(1) tissue signature of invention steel is as Fig. 1.
(2) invention steel and compared steel performance are as shown in table 2:
Table 2
The present invention has substantive distinguishing features and marked improvement, and the present invention utilizes the feature of the high nitrogen of electric steel, has exempted the measure of converter steel denitrogenation, and nitrogen has played the effect of strengthening steel Medium pearlite, has improved tensile strength and the strong flexor ratio of steel, and technique is simple, and cost is low.
Claims (1)
1. a high nitrogen ferritic-pearlitic steel, is characterized in that the composition range of steel, according to weight percent, count: C :≤0.35%, Si:0.3～0.8%, Mn:0.60～1.60, P≤0.045%, S≤0.035%, 120ppm≤N≤300ppm, according to the requirement of steel over-all properties, amount adds V, Nb microalloy element, microalloy element total amount is no more than 0.15%, and all the other are Fe and impurity element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410453848.XA CN104195425A (en) | 2014-09-07 | 2014-09-07 | High-nitrogen ferrite pearlite steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410453848.XA CN104195425A (en) | 2014-09-07 | 2014-09-07 | High-nitrogen ferrite pearlite steel |
Publications (1)
| Publication Number | Publication Date |
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| CN104195425A true CN104195425A (en) | 2014-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410453848.XA Pending CN104195425A (en) | 2014-09-07 | 2014-09-07 | High-nitrogen ferrite pearlite steel |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102383033A (en) * | 2011-11-08 | 2012-03-21 | 河北钢铁股份有限公司承德分公司 | 600-MPa grade vanadium-containing high-strength hot-rolled steel bar and production method thereof |
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2014
- 2014-09-07 CN CN201410453848.XA patent/CN104195425A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102383033A (en) * | 2011-11-08 | 2012-03-21 | 河北钢铁股份有限公司承德分公司 | 600-MPa grade vanadium-containing high-strength hot-rolled steel bar and production method thereof |
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| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20141210 |