CN1769510A - Steel for high strength shock-proof hot-rolled steel bar - Google Patents
Steel for high strength shock-proof hot-rolled steel bar Download PDFInfo
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- CN1769510A CN1769510A CN 200410065254 CN200410065254A CN1769510A CN 1769510 A CN1769510 A CN 1769510A CN 200410065254 CN200410065254 CN 200410065254 CN 200410065254 A CN200410065254 A CN 200410065254A CN 1769510 A CN1769510 A CN 1769510A
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Abstract
This invention relates to a aseismatic heat rolled steel bar with high strength, which belongs to alloy steel, especially to the heat rolled steel bar, the steel bar is composed by the following elements: 0.07-0.16%C, 1.2-2.0%Si, 1.5-2.0%Mn, <=0.4%Cr, 0.02-0.14%V, the rest is Fe and impurity. The universal steel-making device uses the universal technology; it smelts steel according to the said component range and produces heat rolled steel bar or rod with highe strength and better aseismatic charater. Wherein the yield strengthen sigmas(p0.2)>=550MPa, the yield proportion sigmab/sigmas(p0.2)>=1.45. And the high strength and high yield proportion of the steel bar can enforce the aseismatic charater of the building.
Description
Technical field
The invention belongs to steel alloy, relate in particular to the hot-rolled reinforced bar steel that Steel Concrete is used, or other high-strength steel hot-work bar steel.
Background technology
The mechanical property of alloying element in the steel and content influence steel, the yield strength of reinforcing bar, the height of strong flexor ratio directly influence the security and the anti-seismic performance of building structure.Therefore, building structure uses the well behaved hot-rolled reinforced bar of high-strength anti-seismic to be subjected to people's attention day by day.At present, both at home and abroad the highest yield strength rank of using of hot-rolled reinforced bar for building has only 500-520MPa, as the peak demand of the strong flexor ratio of important anti-seismic performance index also can only be 〉=1.30.Require yield strength 〉=460MPa, strong flexor ratio 〉=1.10 as the 460MPa grade reinforcing steel in the Britain BS4449:1997 standard; SD490 reinforcing bar in the Japan JIS G3112-1987 standard requires yield strength 〉=490MPa, and strong flexor ratio is not stipulated; BSt500S reinforcing bar composition in the Germany DIN488/1-1984 standard requires :≤0.22%C ,≤0.050%P, S require yield strength 〉=500Mpa, strong flexor ratio 〉=1.05.HRB500 reinforcing bar in the China GB1499-1998 standard, composition require :≤0.25%C ,≤0.80%Si, ≤ 1.60%Mn ,≤0.045%P, S ,≤0.55%Ceq, require yield strength 〉=500MPa, the peak demand of User Agreement clause strong flexor ratio be 〉=1.30.Because the yield strength and the strong flexor ratio of the reinforcing bar of above-mentioned various countries are all on the low side, so will guarantee the security and the anti-seismic performance of building structure, must increase row's muscle density, or the specification of the big reinforcing bar of power, increased rolled steel dosage, improve laid down cost.
Summary of the invention
In order to overcome the shortcomings and deficiencies that prior art exists, the present invention discloses a kind of steel for high strength shock-proof hot-rolled steel bar, hot-rolled reinforced bar or other hot-work bar produced with this steel, its yield strength and strong flexor ratio obviously improve, the consumption of the hot-rolled reinforced bar that is used to build with saving, improve the security and the anti-seismic performance of building structure, reduce laid down cost.
The high-strength hot rolled reinforced bar steel, by following column element by weight percentage (%) form:
0.07-0.16%C, 1.2-2.0%Si, 1.5-2.0%Mn ,≤0.4%Cr, 0.02-0.14%V, all the other are Fe and impurity element.
The combination of above-mentioned these elements and content (%) scope is determined by a large amount of tests.The effect of these elements in steel is described below:
Reduce C content and help improving welding property; Mn postpones perlitic transformation, can improve hardening capacity, plays the effect of solution strengthening and refinement ferrite crystal grain, and Mn reduces A
3, A
1Stagnation point when postponing perlitic transformation, is also postponed ferritic transformation; Si can promote proeutectoid ferrite to separate out, and little to the influence that perlite forms, Si improves A
3, A
1Stagnation point also has intensive solution strengthening effect; Cr can postpone perlite and ferritic transformation strongly, can increase the hardening capacity of steel, though Cr is weak solution strengthening element, austeniticly crosses cold energy power but can increase, thereby thinning microstructure, effect is strengthened; V is dissolved in the hardening capacity that can significantly increase steel in the austenite, and the carbide of the V that separates out in ferrite or carbonitride have significant dispersion-strengthened action, and V can pass through forms such as V-Fe alloy, V-N alloy, V slag alloying and add in the steel.
The present invention only needs to adopt general process for making in general steelmaking equipment, smelts by above-mentioned definite composition range; At general steel rolling equipment and common rolling technology, under the condition of hot rolling one air cooling, produce good hot-rolled reinforced bar of high-strength anti-seismic or high-strength hot processing bar.Its microstructure is based on ferrite+martensite (or bainite), also contains tissues such as a small amount of perlite sometimes.Its performance index: yield strength σ
S (p0.2)〉=550MPa, σ
b〉=850MPa, σ
b/ σ
S (p0.2)〉=1.45, δ
5〉=12%, clod wash d=5a, 90 ° are qualified.
The hot-rolled reinforced bar that adopts the present invention to produce because intensity improves, can be saved steel, reduces row's muscle density, reduces laid down cost, or increases the intensity of structure, strengthens the safety margin amount; Because the strong flexor ratio as important anti-seismic performance index obviously improves, and can improve the anti-seismic performance of buildings, increase the security of building structure.
Description of drawings (summary)
Embodiment
Further specify the present invention below by embodiment and Comparative Examples.In the following Examples and Comparative Examples: C: carbon, Si: silicon, Mn: manganese, P: phosphorus, S: sulphur, Cr: chromium, V: vanadium, σ
S (p0.2)(MPa) yield strength of expression steel, this numerical value is high more, and the intensity of expression reinforcing bar is high more; σ
b(MPa) tensile strength of expression steel is used strong flexor ratio σ
b/ σ
S (σ p0.2)The shock resistance index of expression reinforcing bar, this ratio is big more, and the anti-seismic performance of expression reinforcing bar is good more.
Embodiment 1: " numbering " that on general steelmaking equipment, adopts common process for making to press table 1 respectively, and specified each element and content (weight percent %) are smelted; With general steel rolling equipment and rolling technology, produce the high-strength anti-seismic hot-rolled reinforced bar of nominal diameter 18mm; The steel bar mechanics performance test result is listed in the table 1.
Embodiment 2: press " numbering " 2 specified each element and the content (weight percent %) of table 1, repeat the method for embodiment 1, produce the earthquake-resistant hot rolled reinforcing bar of hot-rolled high-strength of nominal diameter 18mm, the steel bar mechanics performance test result is listed in the table 1.
Embodiment 3: press " numbering " 3 specified each element and the content (weight percent %) of table 1, repeat the method for embodiment 1, produce the earthquake-resistant hot rolled reinforcing bar of hot-rolled high-strength of nominal diameter 18mm, the steel bar mechanics performance test result is listed in the table 1.
Embodiment 4: press " numbering " 4 specified each element and the content (weight percent %) of table 1, repeat the method for embodiment 1, produce the earthquake-resistant hot rolled reinforcing bar of hot-rolled high-strength of nominal diameter 18mm, the steel bar mechanics performance test result is listed in the table 1.
Embodiment 5: press " numbering " 5 specified each element and the content (weight percent %) of table 1, repeat the method for embodiment 1, produce the earthquake-resistant hot rolled reinforcing bar of hot-rolled high-strength of nominal diameter 18mm, the steel bar mechanics performance test result is listed in the table 1.
Performance embodiment (the composition % of table 1 composition of the present invention and reinforcing bar; Intensity MPa; Unit elongation %)
| Numbering | C | Si | Mn | P | S | Cr | V | σ s(p0.2) | σ b | δ 5 | σ b/ σ s(p0.2) | Clod wash d=5a, 90 ° |
| 1 | 0.13 | 1.27 | 2.00 | 0.039 | 0.023 | 0.36 | 0.10 | 616 | 1004 | 21 | 1.63 | Qualified |
| 2 | 0.14 | 1.52 | 1.82 | 0.036 | 0.018 | 0.27 | 0.13 | 648 | 959 | 17 | 1.48 | Qualified |
| 3 | 0.14 | 1.94 | 1.97 | 0.032 | 0.008 | 0.28 | 0.13 | 586 | 943 | 17 | 1.61 | Qualified |
| 4 | 0.15 | 1.49 | 1.83 | 0.022 | 0.005 | 0.36 | 0.11 | 558 | 921 | 16 | 1.65 | Qualified |
| 5 | 0.16 | 1.43 | 1.77 | 0.022 | 0.007 | 0.27 | 0.14 | 679 | 1074 | 14 | 1.58 | Qualified |
Comparative Examples 1: the 460MPa grade reinforcing steel chemical ingredients in the Britain BS4449:1997 standard :≤0.25%C ,≤0.050%P, S ,≤0.51%Ceq requires yield strength 〉=460MPa, strong flexor ratio 〉=1.10.
Comparative Examples 2: the SD490 reinforcing bar composition requirement in day mark JIS G3112-1987 standard is :≤0.32%C, and≤0.55%Si ,≤1.80%Mn ,≤0.040%P, S ,≤0.60% (C+Mn/6) requires yield strength 〉=490MPa, and strong flexor ratio is not stipulated.
Comparative Examples 3: the BSt500S reinforcing bar composition requirement in the German DIN488/1-1984 standard is :≤0.22%C ,≤0.050%P, S require yield strength 〉=500MPa, strong flexor ratio 〉=1.05.
Comparative Examples 4: the HRB500 reinforcing bar in the Chinese GB1499-1998 standard, composition requires :≤0.25%C, ≤ 0.80%Si ,≤1.60%Mn ,≤0.045%P, S, ≤ 0.55%Ceq, Ceq=C+Mn/6+ (Cr+V+Mo)/5+ (Cu+Ni)/15 as required, also can add elements such as V, Nb, Ti in the steel, require yield strength 〉=500MPa, the peak demand of User Agreement clause strong flexor ratio be 〉=1.30.
Claims (4)
1, steel for high strength shock-proof hot-rolled steel bar, by following element by weight percentage (%) form:
0.07-0.16%C, 1.2-2.0%Si, 1.5-2.0%Mn ,≤0.4%Cr, 0.02-0.14%V, all the other are Fe and impurity element.
2, steel for high strength shock-proof hot-rolled steel bar according to claim 1, its most preferably alloying element by weight percentage (%) be: 0.13-0.15%C, 1.3-1.6%Si, 1.7-1.9%Mn ,≤0.4%Cr, 0.08-0.13%V, when carrying out alloying (add the V-N alloy content be 0.04-0.7%), all the other are Fe and impurity element.
3, steel for high strength shock-proof hot-rolled steel bar according to claim 1, its yield strength σ
S (p0.2)〉=550MPa, yield ratio σ
b/ σ
S (p0.2)〉=1.45.
4, steel for high strength shock-proof hot-rolled steel bar according to claim 1 is characterized in that microstructure is based on ferrite+martensite (or bainite), also contains tissues such as a small amount of perlite sometimes.
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| CNB2004100652548A CN100415925C (en) | 2004-11-05 | 2004-11-05 | Steel for high strength shock-proof hot-rolled steel bar |
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| CNB2004100652548A CN100415925C (en) | 2004-11-05 | 2004-11-05 | Steel for high strength shock-proof hot-rolled steel bar |
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| CN100415925C CN100415925C (en) | 2008-09-03 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102747274A (en) * | 2012-07-13 | 2012-10-24 | 江苏永钢集团有限公司 | Vanadium-boron microalloyed waste heat treatment reinforced bar steel and production technique thereof |
| CN103038382A (en) * | 2010-06-28 | 2013-04-10 | 现代制铁株式会社 | Ultra-high-strength steel bar and method for manufacturing same |
| CN103484775A (en) * | 2013-09-26 | 2014-01-01 | 江苏天舜金属材料集团有限公司 | High-strength hot-rolled reinforcement bar of 730 MPa level, and production technology thereof |
| CN105296853A (en) * | 2015-11-30 | 2016-02-03 | 山东石横特钢集团有限公司 | 930-MPa high-strength finished deformed steel bars and preparation technology thereof |
| CN108913995A (en) * | 2018-07-10 | 2018-11-30 | 陕钢集团汉中钢铁有限责任公司 | A kind of HRB600E high-strength anti-seismic steel bar and its production method |
| CN113755764A (en) * | 2021-07-30 | 2021-12-07 | 江苏鸿泰钢铁有限公司 | Anti-seismic twisted steel based on crystal optimization and production process thereof |
| CN114107612A (en) * | 2021-11-30 | 2022-03-01 | 马鞍山钢铁股份有限公司 | Tempering heat treatment design method for H-shaped steel, hot-rolled H-shaped steel for anti-seismic and fire-resistant building structure and tempering heat treatment method for hot-rolled H-shaped steel |
| CN116254469A (en) * | 2021-06-10 | 2023-06-13 | 广西柳钢华创科技研发有限公司 | HRB500E common hot rolled ribbed steel bar with strength-to-bending ratio greater than 1.28 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1103673A (en) * | 1993-12-06 | 1995-06-14 | 辽宁工学院 | Air-cooled transformed-bainite high-strength screw-thread steel and its processing technology |
| CN1113975C (en) * | 2000-09-08 | 2003-07-09 | 清华大学 | Heterogeneous low-carbon air-cooled granular bainite/crystalloid ferrite steel |
-
2004
- 2004-11-05 CN CNB2004100652548A patent/CN100415925C/en active Active
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103038382A (en) * | 2010-06-28 | 2013-04-10 | 现代制铁株式会社 | Ultra-high-strength steel bar and method for manufacturing same |
| CN103038382B (en) * | 2010-06-28 | 2015-04-22 | 现代制铁株式会社 | Ultra-high-strength steel bar and method for manufacturing same |
| US9200353B2 (en) | 2010-06-28 | 2015-12-01 | Hyundai Steel Company | Method for manufacturing an ultra-highstrength steel bar |
| CN102747274A (en) * | 2012-07-13 | 2012-10-24 | 江苏永钢集团有限公司 | Vanadium-boron microalloyed waste heat treatment reinforced bar steel and production technique thereof |
| CN103484775A (en) * | 2013-09-26 | 2014-01-01 | 江苏天舜金属材料集团有限公司 | High-strength hot-rolled reinforcement bar of 730 MPa level, and production technology thereof |
| CN103484775B (en) * | 2013-09-26 | 2015-04-15 | 江苏天舜金属材料集团有限公司 | High-strength hot-rolled reinforcement bar of 730 MPa level, and production technology thereof |
| CN105296853A (en) * | 2015-11-30 | 2016-02-03 | 山东石横特钢集团有限公司 | 930-MPa high-strength finished deformed steel bars and preparation technology thereof |
| CN108913995A (en) * | 2018-07-10 | 2018-11-30 | 陕钢集团汉中钢铁有限责任公司 | A kind of HRB600E high-strength anti-seismic steel bar and its production method |
| CN116254469A (en) * | 2021-06-10 | 2023-06-13 | 广西柳钢华创科技研发有限公司 | HRB500E common hot rolled ribbed steel bar with strength-to-bending ratio greater than 1.28 |
| CN113755764A (en) * | 2021-07-30 | 2021-12-07 | 江苏鸿泰钢铁有限公司 | Anti-seismic twisted steel based on crystal optimization and production process thereof |
| CN114107612A (en) * | 2021-11-30 | 2022-03-01 | 马鞍山钢铁股份有限公司 | Tempering heat treatment design method for H-shaped steel, hot-rolled H-shaped steel for anti-seismic and fire-resistant building structure and tempering heat treatment method for hot-rolled H-shaped steel |
| CN114107612B (en) * | 2021-11-30 | 2023-04-18 | 马鞍山钢铁股份有限公司 | Tempering heat treatment design method for H-shaped steel, hot-rolled H-shaped steel for anti-seismic and fireproof building structure and tempering heat treatment method for hot-rolled H-shaped steel |
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| CN100415925C (en) | 2008-09-03 |
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Assignee: Anhui BRC & Ma Steel Weldmesh Co., Ltd. Assignor: Ma'anshan Iron and Steel Co., Ltd. Contract record no.: 2011340000089 Denomination of invention: Steel for high strength shock-proof hot-rolled steel bar Granted publication date: 20080903 License type: Exclusive License Open date: 20060510 Record date: 20110707 |