CN103276179A - Manufacturing method for pipe line steel with characteristics of high steel plasticity and double peak grain distribution - Google Patents
Manufacturing method for pipe line steel with characteristics of high steel plasticity and double peak grain distribution Download PDFInfo
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- CN103276179A CN103276179A CN2013102259270A CN201310225927A CN103276179A CN 103276179 A CN103276179 A CN 103276179A CN 2013102259270 A CN2013102259270 A CN 2013102259270A CN 201310225927 A CN201310225927 A CN 201310225927A CN 103276179 A CN103276179 A CN 103276179A
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Abstract
The present invention relates to a manufacturing method for a pipe line steel with characteristics of high steel plasticity and double peak grain distribution. The manufacturing method comprises common pipe line steel preparation steps, further comprises a two phase region quenching or tempering step, and concretely comprises: re-heating a common pipe line steel to a temperature of 780-830 DEG C, carrying out thermal insulation, and carrying out water quenching or air cooling to manufacture the pipe line steel with double peak grain distribution, wherein a thermal insulation time is 2 min/mm*a pipe line steel plate thickness, and a cooling rate is 1-20 DEG C/s during water quenching or air cooling. According to the present invention, a strengthening effect of a dispersed precipitation phase in steel is completely provided to obtain a structure of the grain with characteristics of double peak distribution and different thicknesses from the steel so as to compensate low steel plasticity of the single ultra-fine grain, maintain basic properties of the original steel material, and make a yield ratio of less than 0.70.
Description
Technical field
The present invention relates to a kind of manufacture method of pipe line steel, more particularly, relate to the manufacture method of the pipe line steel of the bimodal crystal grain distribution of having of a kind of high steel plasticity, belong to pipe line steel manufacturing technology field.
Background technology
Iron and steel was still and accounted for leading structured material 21 century, do not have a kind of material can the full substitution iron and steel.Along with society and expanding economy, Iron And Steel Industry is faced with the three big pressure of saving resource, save energy, protection environment.Therefore, improve steel product quality, reduce cost, exploitation and human friendly ferrous materials increase substantially its comprehensive mechanical property, have become the main direction of ferrous materials research.Wherein, adopting hot mechanical controlled rolling technology (TMCP) and deformation induced ferrite transformation technology (DIFT) to produce fine grain, high strength degree steel at low cost is the developing direction of current metallurgy industry.
Usually, the yield strength of steel and tensile strength are directly proportional with-1/2 power of crystal grain diameter d, grain refining will make the yield strength of steel and tensile strength significantly improve, but grain refining is bigger to the contribution of the contribution comparison tensile strength of yield strength, and the more thin yield tensile ratio of crystal grain is more high.The rising of yield tensile ratio will cause the cold forming capability of steel significantly to descend.In addition, crystal grain is more thin, and intensity improves, and the room temperature unit elongation is more little.Thereby high-yield-ratio, inductile are the difficult problems that existing ultra-fine brilliant production technology is still needed and solved.
Studies show that in recent years, introduce an amount of thick relatively crystal grain in the ultrafine-grained (UFG) microstructure in steel, namely cause the crystalline-granular texture of bimodal distribution of sizes, can under the very little situation of loss of strength, greatly improve unit elongation, but, the problem of present processing method and unresolved yield tensile ratio, the yield tensile ratio that obtains steel is very high, steel plasticity is very poor, has limited the range of application of steel greatly.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the shortcoming of prior art, and a kind of raising steel plasticity is provided, the manufacture method with pipe line steel that bimodal crystal grain distributes of the high steel plasticity of the range of application of expansion steel.
In order to solve above technical problem, the invention provides the manufacture method of the pipe line steel of the bimodal crystal grain distribution of having of a kind of high steel plasticity, the preparation process that comprises common pipe line steel, comprise that also two-phase region quenches or tempering step, be specially: insulation after common pipe line steel reheat to temperature is 780～830 ℃, soaking time is the thickness of slab of 2min/mm * pipe line steel, carries out shrend or air cooling then, makes to have the pipe line steel that bimodal crystal grain distributes.
The technical scheme that the present invention further limits is: when carrying out shrend or air cooling, speed of cooling is grown up to prevent ferrite crystal grain between 1～20 ℃/s.
Further, the metallographic structure of the pipe line steel that makes is the ferrite superfine crystal particle structure with bimodal distribution, it is about 30～35% that wherein the volume fraction of the crystal grain of diameter below 1 μ m accounts for 50～55%, 5-10 μ m crystal particle volume mark, and remaining ingredient is the crystal grain of other size ranges.
Further, the mechanical property of the pipe line steel that makes is: yield strength is 450～530MPa, and tensile strength is 670～760MPa, unit elongation 〉=27%, yield tensile ratio Rt0.2/Rm≤0.70.
Further, the preparation process of common pipe line steel adopts common process, and its chemical ingredients has two kinds of proportionings, and first kind of proportioning is: C:0.072wt%; Si:0.20wt%; Mn:1.55wt%; P:0.010wt%; S:0.0018wt%; Nb:0.025wt%; V:0.025wt%; Ti:0.011wt%; Cu:0.20wt%; Cr:0.10wt%; Ni:0.15wt%; Alt:0.030wt%.Second kind of proportioning is: C:0.080wt%; Si:0.25wt%; Mn:1.35wt%; P:0.013wt%; S:0.0027wt%; Nb:0.026wt%; V:0.020wt%; Ti:0.012wt%; Cu:0.25wt%; Cr:0.15wt%; Ni:0.16wt%; Alt:0.025wt%.Manufacture method of the present invention improves the steel plasticity energy of common pipe line steel, to the pipe line steel better effects if of above-mentioned two kinds of chemical ingredients proportionings, more can hang down the loss of steel yield strength in the heat treatment process, increases substantially tensile strength.
The invention has the beneficial effects as follows: the manufacture method of the pipe line steel with bimodal crystal grain distribution of a kind of high steel plasticity provided by the invention, quench or tempering step by increasing two-phase region, and, adopt the heat insulation in two-phase region quenching or the tempering step, increase precipitate and separate out probability, give full play to the strengthening effect of disperse precipitated phase in the steel, in steel, obtain to have the tissue of the different crystal grain of the thickness of bimodal distribution, remedy the lower phenomenon of simple ultra-fine grain steel plasticity, the fundamental property that keeps former steel also makes yield tensile ratio be lower than 0.70; The present invention improves the normal temperature plasticity of Ultrafine Grained Steel greatly under the condition of very small intensity loss, improve the cold forming capability of steel, widens Ultrafine Grained Steel structure applications scope, reduces the loss of steel yield strength in the heat treatment process, increases substantially tensile strength; The present invention does not need to change the composition of former pipe line steel, and rolling technology, need in the operation of rolling, not carry out more rambunctious as the relaxation precipitation process or as deformation induced ferrite transformation technology in low temperature depress fast cold method greatly, this technological operation is easy, do not influence situ production rhythm, stable processing technique, workable, the material excellent combination property that cost is low, obtain can be applied to have the production of the Ultrafine Grained Steel sheet material of excellent comprehensive mechanical property economically.
Description of drawings
Fig. 1 is the stereoscan photograph of embodiment 1 by the ultra-fine grain steel with bimodal distribution of TMCP+ intercritical hardening acquisition;
Fig. 2 is that embodiment 2 is by the stereoscan photograph of the ultra-fine grain steel with bimodal distribution of the inferior warm tempering acquisition of TMCP+.
Embodiment
The invention provides the manufacture method of the pipe line steel of the bimodal crystal grain distribution of having of a kind of high steel plasticity, the preparation process that comprises common pipe line steel, comprise that also two-phase region quenches or tempering step, be specially: insulation after common pipe line steel reheat to temperature is 780～830 ℃, soaking time is the thickness of slab of 2min/mm * pipe line steel, carry out shrend or air cooling then, make the pipe line steel with bimodal crystal grain distribution.When carrying out shrend or air cooling, speed of cooling is between 1～20 ℃/s.
Embodiment 1
Present embodiment uses thickness of slab to be the common pipe line steel of 21mm, and chemical ingredients sees Table 1, is organized as bainite structure.
The chemical ingredients (wt%) of table 1: embodiment 1 described common pipe line steel
| C | Si | Mn | P | S | Nb | V | Ti | Cu | Cr | Ni | Alt |
| 0.072 | 0.20 | 1.55 | 0.010 | 0.0018 | 0.025 | 0.025 | 0.011 | 0.20 | 0.10 | 0.15 | 0.030 |
The preparation of the manufacturing of common pipe line steel and rolling employing routine and rolling technology.
After common pipeline steel is made and is finished, carrying out two-phase region quenching step, be specially: place heat treatment furnace to reheat 810 ℃ common pipe line steel, under this temperature, be incubated 42min then, increase precipitates such as Nb, V, N and separate out probability, reduce the loss of steel yield strength in the heat treatment process, increase substantially tensile strength.Take the mode with water quenching after insulation finishes, with the pipe line steel cooling, speed of cooling is between 1～20 ℃/s.
The mechanical property of handling the rear line steel sees Table 2, the stereoscan photograph of microstructure as shown in Figure 1, pipe line steel is for having the superfine crystal particle ferritic structure structure of bimodal distribution uniformly, wherein, the volume fraction of the crystal grain of diameter below 1 μ m accounts for 50%, 5-10 μ m crystal particle volume mark accounts for 35%, and the volume fraction of all the other size range crystal grain accounts for 15%.
The mechanical property of the pipe line steel that table 2: embodiment 1 makes
Embodiment 2
Present embodiment uses thickness of slab to be the common pipe line steel of 21mm, and chemical ingredients is identical with the common pipe line steel of use among the embodiment 1, sees Table 1.
The manufacturing of the common pipe line steel of present embodiment and rolling technology are identical with technology among the embodiment 1.
After common pipeline steel was made and finished, two-phase region quenching step was also substantially the same manner as Example 1 carrying out, and difference is: the temperature that reheats in the pre-treatment stove is 830 ℃.
The mechanical property of handling the rear line steel sees Table 3, pipe line steel is for having the superfine crystal particle ferritic structure structure of bimodal distribution uniformly, wherein, the volume fraction of the crystal grain of diameter below 1 μ m accounts for 52%, 5-10 μ m crystal particle volume mark accounts for 34%, and the volume fraction of all the other size range crystal grain accounts for 14%.
The mechanical property of the pipe line steel that table 3: embodiment 2 makes
Embodiment 3
Present embodiment uses thickness of slab to be the pipe line steel of 21mm, and chemical ingredients sees Table 4, is organized as bainite structure.
The chemical ingredients (wt%) of table 4: embodiment 3 described common pipe line steels
| C | Si | Mn | P | S | Nb | V | Ti | Cu | Cr | Ni | Alt |
| 0.080 | 0.25 | 1.35 | 0.013 | 0.0027 | 0.026 | 0.020 | 0.012 | 0.25 | 0.15 | 0.16 | 0.025 |
The preparation of the manufacturing of common pipe line steel and rolling employing routine and rolling technology.
After common pipeline steel is made and is finished, carrying out the two-phase region tempering step, be specially: place heat treatment furnace to reheat 780 ℃ common pipe line steel, under this temperature, be incubated 42min then, insulation is taked air-cooled mode after finishing, with the pipe line steel cooling, speed of cooling is between 1～20 ℃/s.
The mechanical property of handling back sheet material sees Table 5, the stereoscan photograph of microstructure as shown in Figure 2, ferrite also is the weave construction of bimodal grain size distribution, wherein the volume fraction of the crystal grain of diameter below 1 μ m accounts for 55%, 5-10 μ m crystal particle volume mark accounts for 30%, and the volume fraction of all the other size range crystal grain accounts for 15%.
The mechanical property of the pipe line steel that table 5: embodiment 3 makes
Embodiment 4
Present embodiment uses thickness of slab to be the common pipe line steel of 21mm, and chemical ingredients is identical with the common pipe line steel of use among the embodiment 3, sees Table 4.
The manufacturing of the common pipe line steel of present embodiment and rolling technology are identical with technology among the embodiment 3.
After common pipeline steel was made and finished, the two-phase region tempering step was also substantially the same manner as Example 3 carrying out, and difference is: the temperature that reheats in the pre-treatment stove is 800 ℃.
The mechanical property of handling the rear line steel sees Table 6, pipe line steel is for having the superfine crystal particle ferritic structure structure of bimodal distribution uniformly, wherein, the volume fraction of the crystal grain of diameter below 1 μ m accounts for 53%, 5-10 μ m crystal particle volume mark accounts for 32%, and the volume fraction of all the other size range crystal grain accounts for 15%.
The mechanical property of the pipe line steel that table 6: embodiment 4 makes
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 requirement of the present invention.
Claims (6)
1. the manufacture method with pipe line steel that bimodal crystal grain distributes of a high steel plasticity, the preparation process that comprises common pipe line steel, it is characterized in that, comprise that also two-phase region quenches or tempering step, be specially: insulation after common pipe line steel reheat to temperature is 780～830 ℃, soaking time is the thickness of slab of 2 min/mm * pipe line steel, carries out shrend or air cooling then, makes to have the pipe line steel that bimodal crystal grain distributes.
2. the manufacture method of the pipe line steel with bimodal crystal grain distribution of a kind of high steel plasticity according to claim 1 is characterized in that when carrying out shrend or air cooling, speed of cooling is between 1～20 ℃/s.
3. the manufacture method with pipe line steel that bimodal crystal grain distributes of a kind of high steel plasticity according to claim 1, it is characterized in that, the metallographic structure of the pipe line steel that makes is the ferrite superfine crystal particle structure with bimodal distribution, wherein the volume fraction of the crystal grain of diameter below 1 μ m accounts for 50～55%, 5-10 μ m crystal particle volume mark is about 30～35%, and remaining ingredient is the crystal grain of other size ranges.
4. the manufacture method with pipe line steel that bimodal crystal grain distributes of a kind of high steel plasticity according to claim 1, it is characterized in that, the mechanical property of the pipe line steel that makes is: yield strength is 450～530MPa, tensile strength is 670～760MPa, unit elongation 〉=27%, yield tensile ratio Rt0.2/Rm≤0.70.
5. the manufacture method of the pipe line steel with bimodal crystal grain distribution of a kind of high steel plasticity according to claim 1 is characterized in that the preparation process of common pipe line steel adopts common process, and its chemical ingredients is: C:0.072 wt%; Si:0.20 wt%; Mn:1.55 wt%; P:0.010 wt%; S:0.0018 wt%; Nb:0.025 wt%; V:0.025 wt%; Ti:0.011 wt%; Cu:0.20 wt%; Cr:0.10 wt%; Ni:0.15 wt%; Alt:0.030 wt%.
6. the manufacture method of the pipe line steel with bimodal crystal grain distribution of a kind of high steel plasticity according to claim 1 is characterized in that the preparation process of common pipe line steel adopts common process, and its chemical ingredients is: C:0.080 wt%; Si:0.25 wt%; Mn:1.35 wt%; P:0.013 wt%; S:0.0027 wt%; Nb:0.026 wt%; V:0.020 wt%; Ti:0.012 wt%; Cu:0.25 wt%; Cr:0.15wt%; Ni:0.16 wt%; Alt:0.025 wt%.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103540717A (en) * | 2013-09-27 | 2014-01-29 | 中原工学院 | Processing method for hydrogen sulfide corrosion resistance of pipeline steel |
| CN106011422A (en) * | 2016-08-03 | 2016-10-12 | 唐山学院 | High-strength steel with bimodal scale ferrite structure and low cost preparation method thereof |
| CN106591553A (en) * | 2016-11-25 | 2017-04-26 | 钢铁研究总院 | Manufacturing method of ultrafine grain pipeline steel with bimodal grain distribution |
| CN112522618A (en) * | 2020-11-24 | 2021-03-19 | 首钢集团有限公司 | Full-ferrite high-strength steel and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06340922A (en) * | 1993-06-01 | 1994-12-13 | Sumitomo Metal Ind Ltd | Production of low yield ratio high tensile strength steel pipe |
| JP4264177B2 (en) * | 2000-03-01 | 2009-05-13 | 新日本製鐵株式会社 | Method for producing a steel material having a coarse ferrite layer on the surface layer |
| CN101506392A (en) * | 2006-06-29 | 2009-08-12 | 特纳瑞斯连接股份公司 | Seamless precision steel tubes with improved isotropic toughness at low temperature for hydraulic cylinders and process for obtaining the same |
| CN101985722A (en) * | 2010-09-20 | 2011-03-16 | 南京钢铁股份有限公司 | Pipeline steel plate with low yield ratio, fine grains and high strength and production method thereof |
| CN103255273A (en) * | 2013-05-20 | 2013-08-21 | 南京钢铁股份有限公司 | Manufacturing method capable of improving plasticity of pipeline steel plate |
-
2013
- 2013-06-07 CN CN2013102259270A patent/CN103276179A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06340922A (en) * | 1993-06-01 | 1994-12-13 | Sumitomo Metal Ind Ltd | Production of low yield ratio high tensile strength steel pipe |
| JP4264177B2 (en) * | 2000-03-01 | 2009-05-13 | 新日本製鐵株式会社 | Method for producing a steel material having a coarse ferrite layer on the surface layer |
| CN101506392A (en) * | 2006-06-29 | 2009-08-12 | 特纳瑞斯连接股份公司 | Seamless precision steel tubes with improved isotropic toughness at low temperature for hydraulic cylinders and process for obtaining the same |
| CN101985722A (en) * | 2010-09-20 | 2011-03-16 | 南京钢铁股份有限公司 | Pipeline steel plate with low yield ratio, fine grains and high strength and production method thereof |
| CN103255273A (en) * | 2013-05-20 | 2013-08-21 | 南京钢铁股份有限公司 | Manufacturing method capable of improving plasticity of pipeline steel plate |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103540717A (en) * | 2013-09-27 | 2014-01-29 | 中原工学院 | Processing method for hydrogen sulfide corrosion resistance of pipeline steel |
| CN103540717B (en) * | 2013-09-27 | 2016-08-17 | 中原工学院 | The processing method of hydrogen sulfide corrosion resistance of pipeline steel |
| CN106011422A (en) * | 2016-08-03 | 2016-10-12 | 唐山学院 | High-strength steel with bimodal scale ferrite structure and low cost preparation method thereof |
| CN106591553A (en) * | 2016-11-25 | 2017-04-26 | 钢铁研究总院 | Manufacturing method of ultrafine grain pipeline steel with bimodal grain distribution |
| CN112522618A (en) * | 2020-11-24 | 2021-03-19 | 首钢集团有限公司 | Full-ferrite high-strength steel and preparation method thereof |
| CN112522618B (en) * | 2020-11-24 | 2022-02-18 | 首钢集团有限公司 | Full-ferrite high-strength steel and preparation method thereof |
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Application publication date: 20130904 |