CN111254362B - Production method of Gr.B-grade normalizing pipeline steel - Google Patents
Production method of Gr.B-grade normalizing pipeline steel Download PDFInfo
- Publication number
- CN111254362B CN111254362B CN202010246604.XA CN202010246604A CN111254362B CN 111254362 B CN111254362 B CN 111254362B CN 202010246604 A CN202010246604 A CN 202010246604A CN 111254362 B CN111254362 B CN 111254362B
- Authority
- CN
- China
- Prior art keywords
- equal
- temperature
- less
- steel
- normalizing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Metal Rolling (AREA)
Abstract
The production method of the Gr.B-grade normalized pipeline steel comprises the following chemical components, by mass, 0.9-0.12% of C, 0.20-0.30% of Si, 1.20-1.35% of Mn, less than or equal to 0.015% of P, less than or equal to 0.0025% of S, 0.020-0.042% of Alt, 0.015-0.030% of Nb, 0.015-0.020% of Ti, less than or equal to 0.0005% of B, 0.17-0.20% of Pcm, and the balance of Fe and inevitable impurities. The thickness of the steel plate is 10-25 mmGr.B by adopting a rolling and normalizing control process, the steel plate has good strength and low-temperature toughness, the performance is uniform, the same plate difference is controlled within 30MPa, and the yield ratio is less than or equal to 0.75.
Description
Technical Field
The invention belongs to the technical field of steel production, and relates to Gr.B-grade normalizing pipeline steel and a production method thereof.
Background
Along with the rapid development of economy, the daily consumption of energy is frequently innovative, and the demand of human beings on energy is increasing day by day. According to statistics, the energy consumption of petroleum and natural gas in the world accounts for up to 50%, which drives the rapid development of oil-gas pipe network construction. The three major pipe networks of crude oil, natural gas and finished oil in China are basically formed, the trunk line is as long as 50 kilometers, the major pipe network era is taken, the oil and gas pattern of ' south transport of north oil, east transport of west gas and east transport of sea gas ' and landing of sea gas ' is preliminarily formed, and new development peak values are met by steel plates for pipelines for oil and gas transmission engineering.
At present, the prior art pipeline steel plate for oil and gas engineering is generally delivered in a controlled rolling or TMCP state. And the defects of uneven cooling, abnormal structure or poor plate shape and the like can occur after the pipeline steel is rolled in the process, so that the performance of the pipeline steel plate is fluctuated, the yield is low and the stability is poor. And in densely populated areas, the requirements on the stability of various performances of the pipeline steel are higher. Therefore, the pipeline steel puts higher requirements on the composition design and the process design.
Disclosure of Invention
The invention aims to provide a production method of Gr.B-grade normalized pipeline steel, which adopts a production process of controlled rolling and normalizing to produce Gr.B with the wall thickness of 10-25 mm, and the steel plate has good strength and low-temperature toughness, uniform and stable performance, especially the same plate difference of the steel plate is within 30MPa, and the yield ratio is less than or equal to 0.75.
The implementation scheme of the invention is as follows:
a production method of Gr.B-grade normalized pipeline steel comprises the following chemical components, by mass, 0.9-0.12% of C, 0.20-0.30% of Si, 1.20-1.35% of Mn, less than or equal to 0.015% of P, less than or equal to 0.0025% of S, 0.020-0.042% of Alt, 0.015-0.030% of Nb, 0.015-0.020% of Ti, less than or equal to 0.0005% of B, 0.17-0.20% of Pcm, and the balance of Fe and inevitable impurities; the process comprises the following steps:
(1) heating: the temperature of a hearth is 1100-1250 ℃, the temperature of a steel tapping core is 1160-1200 ℃, and the in-furnace time is 200-300 min;
(2) rough rolling: setting the thickness of the intermediate billet to be more than or equal to 3 times of the thickness of a finished product, wherein the initial rolling temperature is 1120-1150 ℃, the final rolling temperature is more than or equal to 980 ℃, the pass reduction rate is more than or equal to 18% in the last 3 passes;
(3) finish rolling: the initial rolling temperature is 880-930 ℃, the final rolling temperature is 760-820 ℃, the pass is 7-9, and the single-pass reduction rate is more than or equal to 12%;
(4) and (3) cooling in a heaped mode: stacking the rolled steel plates for slow cooling, wherein the stacking cooling time is 24-36 hours, and the unstacking temperature is less than or equal to 100 ℃;
(5) normalizing: normalizing at 910 +/-10 ℃, keeping the temperature for 20-30 min, and air-cooling to room temperature after normalizing.
The invention has the following advantages: the low-carbon Nb and Ti alloy has low alloy cost, and can ensure sufficient strength of the normalized steel plate and good low-temperature toughness, especially low-temperature drop hammer performance and ultralow yield ratio of the material by matching with a proper controlled rolling and normalizing heat treatment process. The normalized Gr.B-grade steel produced according to the method has uniform and stable steel plate performance, and the same plate difference is within 30 MPa; yield strength: 320-350 MPa, tensile strength: 470-500 MPa, elongation A50: 40-60 percent, the yield ratio is less than or equal to 0.75, and the impact is 300-400J at-40 ℃.
Drawings
FIG. 1 shows a metallographic structure of a steel plate.
FIG. 2 is a drop hammer fracture morphology.
Detailed Description
The present invention will be further described with reference to the following examples.
The first embodiment is as follows: 17.5mmGr.B normalized line steel.
The smelting chemical component content of the steel is as follows: c =0.10%, Si =0.27%, Mn =1.26%, P =0.012%, S =0.0022%, Alt =0.028%, Nb =0.017%, Ti =0.018%, B =0.0005%, Pcm =0.18%, and the balance is Fe and unavoidable impurities.
Casting blank section 260X 2280mm, the casting blank is heated at first, the hearth temperature: 1100-1250 ℃, and the steel tapping center temperature: 1160-1200 ℃, in-furnace time: 232 min.
Rough rolling: the setting of the intermediate billet is 70mm, the initial rolling temperature of one stage is 1146 ℃, the final rolling temperature is 988 ℃, the reduction rates of 7 passes and the last 3 passes are respectively 18.7%, 21.2% and 24.3%.
Finish rolling: the initial rolling temperature is 890 ℃, the final rolling temperature is 790 ℃, 7 passes are performed, and the single-pass reduction rate is more than or equal to 12.6 percent.
And (3) cooling in a heaped mode: after rolling, the steel plates are intensively stacked and slowly cooled, the stacking cooling is carried out for 30 hours, and the unstacking temperature is 85 ℃.
Normalizing: normalizing temperature 905 ℃ and heat preservation time: and (8) normalizing for 26min, and then cooling to room temperature in air.
The mechanical properties of the produced steel sheets are shown in Table 1.
TABLE 117.5 mm normalized Gr.B mechanical Properties
The present invention will be further described with reference to the following examples.
Example two: 22.2mmGr.B normalized line steel.
The smelting chemical component content of the steel is as follows: c =0.09%, Si =0.25%, Mn =1.28%, P =0.013%, S =0.0018%, Alt =0.026%, Nb =0.018%, Ti =0.015%, B =0.0003%, Pcm =0.18%, and the balance Fe and unavoidable impurities.
Casting blank section 260X 2280mm, the casting blank is heated at first, the hearth temperature: 1100-1250 ℃, and the steel tapping center temperature: 1160-1200 ℃, in-furnace time: 246 min.
Rough rolling: the setting of the intermediate billet is 80mm, the initial rolling temperature of one stage is 1152 ℃, the final rolling temperature is 986 ℃, the reduction rates of 7 passes and the last 3 passes are respectively 18.5%, 22.3% and 25.4%.
Finish rolling: the initial rolling temperature is 870 ℃, the final rolling temperature is 780 ℃, 7 passes are performed, and the single-pass reduction rate is more than or equal to 13.1 percent.
And (3) cooling in a heaped mode: after rolling, the steel plates are intensively stacked and slowly cooled, and the stacking cooling time is 32 hours, and the unstacking temperature is 79 ℃.
Normalizing: normalizing temperature 909 ℃, and holding time: and (5) normalizing for 24min, and then cooling to room temperature in air.
The mechanical properties of the steel plates produced by the process are shown in Table 2, and the metallographic structure is shown in FIG. 2.
TABLE 222.2 mm normalized Gr.B mechanical Properties
Claims (1)
1. A production method of Gr.B-grade normalized pipeline steel is characterized by comprising the following steps: the steel comprises the following chemical components, by mass, 0.09% -0.12% of C, 0.20% -0.30% of Si, 1.20% -1.35% of Mn, less than or equal to 0.015% of P, less than or equal to 0.0025% of S, 0.020% -0.042% of Alt, 0.015% -0.030% of Nb, 0.015% -0.020% of Ti, less than or equal to 0.0005% of B, 0.17% -0.20% of Pcm, and the balance of Fe and inevitable impurities; the process comprises the following steps:
heating: the temperature of a hearth is 1100-1250 ℃, the temperature of a steel tapping core is 1160-1200 ℃, and the in-furnace time is 200-300 min;
rough rolling: setting the thickness of the intermediate billet to be more than or equal to 3 times of the thickness of a finished product, wherein the initial rolling temperature is 1120-1150 ℃, the final rolling temperature is more than or equal to 980 ℃, the pass reduction rate is more than or equal to 18% in the last 3 passes;
finish rolling: the initial rolling temperature is 880-930 ℃, the final rolling temperature is 760-820 ℃, the pass is 7-9, and the single-pass reduction rate is more than or equal to 12%;
and (3) cooling in a heaped mode: stacking the rolled steel plates for slow cooling, wherein the stacking cooling time is 24-36 hours, and the unstacking temperature is less than or equal to 100 ℃;
(5) normalizing: normalizing at 910 +/-10 ℃, keeping the temperature for 20-30 min, and air-cooling to room temperature after normalizing; the yield strength of the normalized steel is 320-350 MPa, the tensile strength is 470-500 MPa, the elongation A50=40% -60%, the yield ratio is less than or equal to 0.75, and the impact is 300-400J at-40 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010246604.XA CN111254362B (en) | 2020-03-31 | 2020-03-31 | Production method of Gr.B-grade normalizing pipeline steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010246604.XA CN111254362B (en) | 2020-03-31 | 2020-03-31 | Production method of Gr.B-grade normalizing pipeline steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111254362A CN111254362A (en) | 2020-06-09 |
| CN111254362B true CN111254362B (en) | 2021-01-19 |
Family
ID=70943507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010246604.XA Active CN111254362B (en) | 2020-03-31 | 2020-03-31 | Production method of Gr.B-grade normalizing pipeline steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111254362B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102605245A (en) * | 2011-12-30 | 2012-07-25 | 内蒙古包钢钢联股份有限公司 | Ni-free normalized type Q370R pressure vessel steel plate and manufacturing method thereof |
| CN110387503A (en) * | 2019-07-23 | 2019-10-29 | 舞阳钢铁有限责任公司 | A kind of low-alloy SA622GrB steel plate and production method |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101921955B (en) * | 2010-07-22 | 2012-05-30 | 首钢总公司 | Method for manufacturing pipeline steel medium plate with excellent tenacity through normalizing rolling |
| CN102839326B (en) * | 2012-09-07 | 2014-10-29 | 首钢总公司 | Hydrogen induced crack resistant BNS steel plate and manufacturing method thereof |
| CN103088256B (en) * | 2013-01-08 | 2015-01-07 | 舞阳钢铁有限责任公司 | Anti-HIC pipeline steel plate and production method thereof |
| CN104862614B (en) * | 2015-06-03 | 2018-02-02 | 南京钢铁股份有限公司 | A kind of X60N normalizings pipe line steel and its production method |
| CN105821335B (en) * | 2016-06-15 | 2018-02-02 | 山东钢铁股份有限公司 | The inexpensive ultralow temperature normalizing type pipe line steel and its production method of a kind of excellent weldability |
| CN106702273B (en) * | 2016-11-29 | 2019-04-09 | 武汉钢铁有限公司 | A kind of economical resistance to H2S corrodes normalizing pipe line steel and production method |
| CN106756537B (en) * | 2016-11-29 | 2019-03-15 | 武汉钢铁有限公司 | A kind of resistance to H2The excellent tough normalizing pipe line steel of height of S corrosive nature and production method |
| CN110592360B (en) * | 2019-08-27 | 2021-09-10 | 西安理工大学 | Heat treatment method of X80 elbow welding joint with excellent low-temperature toughness |
-
2020
- 2020-03-31 CN CN202010246604.XA patent/CN111254362B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102605245A (en) * | 2011-12-30 | 2012-07-25 | 内蒙古包钢钢联股份有限公司 | Ni-free normalized type Q370R pressure vessel steel plate and manufacturing method thereof |
| CN110387503A (en) * | 2019-07-23 | 2019-10-29 | 舞阳钢铁有限责任公司 | A kind of low-alloy SA622GrB steel plate and production method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111254362A (en) | 2020-06-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106544597B (en) | Ultra-thin ultra-wide steel for nuclear power pressure equipment plate and its manufacture method | |
| CN103320693B (en) | Anti-zinc fracturing line steel plate and manufacture method thereof | |
| CN104805375A (en) | Steel plate for super-thick high-tenacity X80 pipeline and manufacturing method of steel plate | |
| CN111155028B (en) | Steel plate for normalized DH36 wind power and preparation method thereof | |
| CN110358973B (en) | Low-cost S420NL low-temperature toughness steel plate and manufacturing method thereof | |
| CN101921955A (en) | Method for manufacturing pipeline steel medium plate with excellent tenacity through normalizing rolling | |
| CN111349859B (en) | Large-thickness 500 MPa-level high-Z-direction laminar-performance low-temperature container steel plate rolled by composite blank and manufacturing method thereof | |
| CN111286672B (en) | Needle-shaped ferrite type X60-grade HIC-resistant pipeline steel and rolling method thereof | |
| CN113862549A (en) | Production method of L360QS hydrogen transmission pipeline steel | |
| CN101451217A (en) | Steel for pipeline and method for producing the same | |
| CN104073744B (en) | The high tenacity X80 pipe line steel coiled sheet of thickness >=18.5mm and production method | |
| CN107119238B (en) | The 690MPa grades wide thin steel for engineering machinery plate of yield strength and its production method | |
| CN113512677A (en) | Production method of steel for super-thick bridge structure | |
| CN111254362B (en) | Production method of Gr.B-grade normalizing pipeline steel | |
| CN103147016B (en) | Cryogenic vessel steel of minus 110 DEG C and manufacturing method thereof | |
| CN112676343A (en) | Method for producing thin anti-seismic fire-resistant steel by adopting continuous rolling and roll rolling heat preservation | |
| CN107442568A (en) | A kind of milling method of big wall thickness pipe line steel | |
| CN107841681B (en) | Perforating gun barrel material and preparation method thereof | |
| CN114480960B (en) | 800 MPa-grade high-strength steel with low yield ratio and low-temperature toughness and production process thereof | |
| CN106282839B (en) | The high-performance steel plate of resistance to sulphuric acid dew point and its manufacturing method | |
| CN113528972B (en) | 460 MPa-level shock-resistant fire-resistant super-thick steel plate and production method thereof | |
| CN112375997B (en) | Manufacturing method of X70M pipeline steel plate used under low-cost and ultralow-temperature conditions | |
| CN113564474A (en) | Steel plate with yield strength not less than 550MPa and low yield ratio for large-scale petroleum storage tank and production method thereof | |
| CN112921239A (en) | Low-yield-ratio 12MnNiVR steel plate and production method thereof | |
| CN111961962A (en) | Rolling method of normalized structural steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |