CN112268730A - Sampling method for multi-line cutting of reinforcing steel bars - Google Patents
Sampling method for multi-line cutting of reinforcing steel bars Download PDFInfo
- Publication number
- CN112268730A CN112268730A CN202010929026.XA CN202010929026A CN112268730A CN 112268730 A CN112268730 A CN 112268730A CN 202010929026 A CN202010929026 A CN 202010929026A CN 112268730 A CN112268730 A CN 112268730A
- Authority
- CN
- China
- Prior art keywords
- slit
- rebars
- steel bars
- steel
- line
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Metal Rolling (AREA)
Abstract
The invention provides a method for sampling multi-line segmented steel bars, which is suitable for hot-rolled ribbed steel bars of a three-to five-segmentation multi-line segmentation process and comprises the following steps: the sampling quantity of each batch of steel bars is more than or equal to 2; the selection of the sampling steel bar comprises the following steps: each sample is cut on different roots, wherein at least one sample is taken from the reinforcing steel bar on the middle hole of the multi-line cutting hole.
Description
Technical Field
The invention relates to the field of steel rolling, in particular to a method for sampling a steel bar, and particularly relates to a method for sampling a multi-line segmented steel bar.
Background
In order to improve the yield and the production efficiency of the small-size steel bars and realize energy conservation and consumption reduction, the slitting rolling technology is mostly adopted for the steel bar production. At present, steel bars with the diameter of 25 mm and below are produced by adopting a cutting mode such as two-cutting, three-cutting, four-cutting and the like according to different specifications, the yield of the steel bars produced by adopting the cutting process can be improved by 10-30%, and correspondingly, the energy consumption can be reduced by 10-20% at the same time, so that the steel bars are generally produced by adopting the cutting process, especially the steel bars with small specifications.
Under the condition that the size deviation and the weight deviation are basically consistent, due to the difference of steel quality among different lines during splitting, the strength of the middle line of the three-splitting and the strength of the middle two lines of the four-splitting are both obviously reduced compared with the strength of the two lines of the side surface, by taking HRB400E as an example, the strength of the middle line of the three-splitting and the strength of the middle two lines of the four-splitting are both reduced by 12-16 MPa compared with the yield strength of the two lines of the side surface, the reduction range is 2.5-3.5%, the steel quality of the two lines of the two-splitting is relatively consistent, the yield strength difference is about 5MPa, and the. That is: generally, the weight deviation of each line of the multi-line split steel bar is controlled to be as identical as possible on site, so that the weak link of the mechanical property of the steel bar is mainly in the middle line or two lines of the multi-line split steel bar.
The sampling of tensile specimens of steel bars in national standards (e.g. steel for GB/T1499.2-2018 Steel for reinforced concrete: part 2: Hot rolled ribbed bars) requires random cutting of different bars. It can be seen that the sampling method specified in the standard is mainly directed to a single-wire product, and for a multi-wire segmented steel bar, if random extraction is applied, the problems that sampling cannot be performed at the position with the lowest strength and the weakest performance, the performance result is poor in representativeness, the missing detection risk is large, and the quality of a user is objected easily after the steel bar leaves a factory or the use safety of a steel bar component is reduced can occur.
In summary, the following problems exist in the prior art: the existing multi-line segmented steel bar sampling has poor performance result representativeness and large omission risk, and the problems of dissimilarity of user quality or reduction of the use safety of steel bar components are easily caused after the steel bars leave a factory.
Disclosure of Invention
The invention provides a sampling method for multi-line cutting of reinforcing steel bars, which aims to solve the problems that after sampling, the performance result is poor in representativeness, the missing inspection risk is large, and the quality of a user is objectified or the use safety of reinforcing steel bar components is reduced after the reinforcing steel bars leave a factory.
The invention provides a method for sampling multi-line segmented steel bars, which is suitable for hot-rolled ribbed steel bars of a three-to five-segmentation multi-line segmentation process, and comprises the following steps:
the sampling quantity of each batch of steel bars is more than or equal to 2;
the selection of the sampling steel bar comprises the following steps: and cutting each sample on different reinforcing steel bars respectively, wherein at least one reinforcing steel bar is taken from the reinforcing steel bar rolled from the middle hole of the multi-line cutting hole.
Further, for the multi-line split steel bars of the three splits, at least one steel bar rolled from the middle hole of the three split holes is taken;
further, for the five-slit multi-line slit steel bar, at least one steel bar is rolled from the middle hole of the five slit holes.
Further, for the four-slit multi-line slit steel bar, at least one steel bar is rolled from one of the two holes in the middle of the four slit holes.
Further, the method for judging the steel bar rolled out from the middle hole comprises the following steps: after the slitting rolling and the multiple-length hot shearing are finished, the friction force of the cooling bed on each line of steel bars is different, the multiple-length steel bars close to the friction plate are extruded by the multiple-length steel bars above the side, the friction force is large, the extrusion force of the multiple-length steel bars far away from the friction plate is small, the tail parts of the steel bars falling in the same tooth groove are staggered with each other along the longitudinal direction of the steel bars after the multiple-length steel bars are loaded on the cooling bed, and the tail parts of the steel bars rolled out from the middle holes are positioned in the middle.
Further, for the multi-line split steel bar of the three-split, the steel bar rolled out from the middle hole is the second steel bar which is positioned in the tooth space and sequentially staggered along the tail part of the steel bar in the longitudinal direction of the steel bar.
Further, for the multi-line split steel bar with five split, the steel bar rolled out from the middle hole is the third steel bar which is positioned in the tooth space and sequentially staggered along the tail part of the steel bar in the longitudinal direction of the steel bar.
Further, for the four-split multi-line split steel bar, the steel bar rolled out from the middle hole is a second steel bar or a third steel bar which is positioned in the tooth space and sequentially staggered along the tail part of the steel bar in the longitudinal direction of the steel bar.
Compared with the existing standard steel bar sampling method, the method has the advantages that the difference current situation of the steel quality of the multi-line segmented steel bar is recognized through the analysis of the segmentation rolling mechanism, and the steel bar with the weakest performance is designated to be sampled, so that the mechanical performance detection result of the steel bar factory inspection is more representative, the omission factor and the user quality objection are reduced, and the use safety of the steel bar component is improved.
Detailed Description
The present invention will now be described in order to more clearly understand the technical features, objects, and effects of the present invention.
The current common cutting mode of the steel bar mainly comprises three cutting, four cutting and the like of two cutting and multi-line cutting, taking a four-cutting hole system as an example, the four-cutting hole system mainly comprises front cutting holes K5-K7, pre-cutting holes K4, cutting holes K3, finished product front holes K2 and finished product holes K1. As can be seen from the four-slitting pass system, the holes before slitting are elliptical holes, rectangular holes or box-shaped holes, compared with the blanks, the tissues and the defect positions of the blanks are basically not obviously changed, and the centers are loose and are still in the central positions of the rolled pieces; when the rolled piece passes through the pre-cut hole and the cutting hole, the rolled piece is flattened and cut, when the cutting is finished, the center loose and center segregation band of the blank is mainly distributed to the middle two lines after the cutting, and the side two lines mainly comprise metal flows of fine isometric crystals and middle columnar crystals at the edges of the blank, so that the structures and the defects of the metal flows of the middle two lines and the side two lines after the four-cutting of the rolled piece are obviously different due to the uneven distribution of the structures and the defects of the blank on the cross section. Similarly, for three-segmentation, the steel quality difference between the middle line and the two lines on the side surface is large after the three-segmentation; for the second segmentation, the steel quality of two lines after the segmentation is not very different.
Under the condition that the size deviation and the weight deviation are basically consistent, due to the difference of steel quality among different lines during splitting, the strength of the middle line of the three-splitting and the strength of the middle two lines of the four-splitting are both obviously reduced compared with the strength of the two lines of the side surface, by taking HRB400E as an example, the strength of the middle line of the three-splitting and the strength of the middle two lines of the four-splitting are both reduced by 12-16 MPa compared with the yield strength of the two lines of the side surface, the reduction range is 2.5-3.5%, the steel quality of the two lines of the two-splitting is relatively consistent, the yield strength difference is about 5MPa, and the. That is: generally, the weight deviation of each line of the multi-line split steel bar is controlled to be as identical as possible on site, so that the weak link of the mechanical property of the steel bar is mainly in the middle line or two lines of the multi-line split steel bar.
The performance difference of the steel bars caused by the inconsistency of the steel quality among the cutting lines is not disclosed in the industry at present, and the sampling requirement of tensile samples of the steel bars in national standards (such as GB/T1499.2-2018 steel for reinforced concrete part 2: hot rolled ribbed steel bars) is that the steel bars are cut in different steel bars randomly. It can be seen that the sampling method specified in the standard is still deficient, for the multi-line segmented steel bar, the sampling at the position with the lowest strength and the weakest performance is not specified, the performance result representativeness is poor, the missing detection risk is large, and the dissimilarity of the user quality is easily caused after the steel bar leaves the factory, or the use safety of the steel bar component is reduced.
The technical parameter control, detection and sampling method comprises the following processes:
1) the steel bar blank is a continuous casting square blank, the side length of the square blank is 150-180 mm, and the components of the blank are controlled according to the GB/T1499.2-2018 requirements.
2) The steel bar blank is hot processed into a steel bar finished product, wherein the rolling process adopts a multi-line splitting process: three-cutting, four-cutting or five-cutting process, etc., and the specification of the steel bar is mainly phi 10-phi 20 mm.
3) The steel bar is sampled at the cold shearing position after passing through the cooling bed, and the sampling temperature is less than or equal to 200 ℃.
4) The sampling method of the steel bar tensile sample comprises the following steps: the length of the sample is 450-550 mm; determining the sampling quantity according to the GB/T1499.2-2018 standard, wherein the sampling quantity of each batch of steel bars is more than or equal to 2; the selection of the sampling steel bar comprises the following steps: each sample is cut on different roots, and in addition, one of the samples needs to be sampled according to a specified method: and in the three-cutting and five-cutting process, the steel bars in the middle first line are sampled during cutting, and in the four-cutting process, the steel bars in any one line in the middle second line are sampled during cutting.
5) Identification and identification of specified sampling steel bar
The main principle is as follows: after the slitting rolling and the multiple-length hot shearing are finished, the friction force of the cooling bed on each line of steel bars is different, the multiple-length steel bars close to the friction plate are extruded by the multiple-length steel bars above the side, the friction force is large, the extrusion force of the multiple-length steel bars far away from the friction plate is small, the tail parts of the steel bars falling in the same tooth space are staggered with each other along the longitudinal direction of the steel bars after the multiple-length steel bars are fed into the cooling bed, three steel bars are arranged in the same tooth space after the three-slitting process steel bars are fed into the cooling bed, the tail parts are staggered from front to back, the middle steel bar can be identified as an appointed sampling steel bar according to. And (4) marking small iron wires on the steel bar binding of the specified sampling, and extracting the samples when the steel bars reach the cold shears.
6) The tensile test was carried out directly on the test specimens without further processing, in accordance with the GB/T28900 standard.
Example 1
The method is applied to the phi 12mm and HRB400E steel bars produced by the willow steel according to the GB/T1499.2-2018 standard by adopting a four-segmentation process, and comprises the following specific steps:
1) the blank is a 165 x 165 continuous casting square blank, and smelting components are controlled as follows: carbon: 0.22%, silicon: 0.58%, manganese: 1.31%, phosphorus: 0.019%, sulfur: 0.028 percent and a proper amount of niobium;
2) the rolling adopts a four-slitting process, and the rolling specification phi is 12 mm;
3) sampling is carried out according to the method, the batch of steel bars take 3 tensile samples, one of the samples is taken from any one of the middle two lines on the splitting line, the other two samples can be taken from the two side lines on the splitting line, the yield strength is 440MPa, 450MPa and 450MPa respectively, the tensile strength is 600MPa, 615MPa and 610MPa respectively, and the yield strength and the tensile strength of the specified sampling steel bars are the lowest values. Therefore, the sampling representativeness is strong, and for the four-segmented multi-line segmented steel bar, the part with the lowest strength and the weakest performance is sampled, so that the missing detection risk is reduced.
Example 2
The method is applied to the phi 16mm and HRB400E steel bars produced by the willow steel according to the GB/T1499.2-2018 standard by adopting a three-segmentation process, and comprises the following specific steps:
1) the blank is a 165 x 165 continuous casting square blank, and smelting components are controlled as follows: carbon: 0.24%, silicon: 0.42%, manganese: 1.43%, phosphorus: 0.022%, sulfur: 0.031%, and appropriate amount of vanadium (nitrogen);
2) the rolling adopts a three-slitting process, and the rolling specification phi is 16 mm;
3) sampling is carried out according to the method, 2 tensile samples are taken from the batch of the steel bars, wherein one tensile sample is from the middle line on the parting line, the yield strength is 425MPa and 440MPa respectively, the tensile strength is 590MPa and 600MPa respectively, and the yield strength and the tensile strength of the specified sampling steel bar are the lowest values.
The invention is suitable for hot-rolled ribbed steel bars (the specification is generally phi 10-phi 20mm) adopting multi-line segmentation processes such as three-segmentation, four-segmentation, five-segmentation and the like, so that the mechanical property detection result of the steel bar factory inspection is more representative, the omission factor and the user quality objection are reduced, and the use safety of the steel bar component is improved.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. In order that the components of the present invention may be combined without conflict, it is intended that all equivalent changes and modifications made by those skilled in the art without departing from the spirit and principles of the present invention shall fall within the protection scope of the present invention.
Claims (8)
1. The sampling method for the multi-line segmented steel bar is suitable for a hot-rolled ribbed steel bar of a three-to five-segmentation multi-line segmentation process, and comprises the following steps:
the sampling quantity of each batch of steel bars is more than or equal to 2;
the selection of the sampling steel bar comprises the following steps: and cutting each sample on different reinforcing steel bars respectively, wherein at least one reinforcing steel bar is taken from the reinforcing steel bar rolled from the middle hole of the multi-line cutting hole.
2. The method for sampling multi-line slit steel reinforcement according to claim 1, wherein at least one reinforcement is taken from the reinforcement rolled from the middle hole among the three slit holes for the three-slit multi-line slit steel reinforcement.
3. The method for sampling multi-line slit rebars as claimed in claim 1, wherein at least one of the rebars is selected from the rebars rolled through the middle hole among the five slit holes, for the five slit multi-line slit rebars.
4. The method for sampling multi-line slit steel reinforcement according to claim 1, wherein at least one reinforcement is taken from the reinforcement rolled through one of the middle two holes among the four slit holes, for the four slit multi-line slit steel reinforcement.
5. The method for sampling multi-line slit steel bars according to any one of claims 1 to 4, wherein the method for judging the steel bars rolled out from the center hole comprises the following steps: after the slitting rolling and the multiple-length hot shearing are finished, the friction force of the cooling bed on each line of steel bars is different, the multiple-length steel bars close to the friction plate are extruded by the multiple-length steel bars above the side, the friction force is large, the extrusion force of the multiple-length steel bars far away from the friction plate is small, the tail parts of the steel bars falling in the same tooth groove are staggered with each other along the longitudinal direction of the steel bars after the multiple-length steel bars are loaded on the cooling bed, and the tail parts of the steel bars rolled out from the middle holes are positioned in the middle.
6. The method for sampling multi-slit rebars as claimed in claim 5, wherein for the three-slit multi-slit rebars, the rebars rolled out through the intermediate holes are the second rebars sequentially staggered from each other at the tail portions of the rebars in the longitudinal direction of the rebars in the tooth spaces.
7. The method for sampling multi-strand sliced reinforcing bar according to claim 5, wherein the reinforcing bar rolled out from the central hole is the third reinforcing bar which is positioned in the tooth space and sequentially staggered from the tail portion of the reinforcing bar in the longitudinal direction of the reinforcing bar for the five-strand sliced reinforcing bar.
8. The method for sampling multi-slit rebars as claimed in claim 5, wherein for the four-slit multi-slit rebars, the rebars rolled out from the intermediate holes are the second or third rebars sequentially staggered from each other at the end of the rebars in the longitudinal direction of the rebars.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010929026.XA CN112268730B (en) | 2020-09-07 | 2020-09-07 | Sampling method for multi-line cutting of reinforcing steel bars |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010929026.XA CN112268730B (en) | 2020-09-07 | 2020-09-07 | Sampling method for multi-line cutting of reinforcing steel bars |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112268730A true CN112268730A (en) | 2021-01-26 |
| CN112268730B CN112268730B (en) | 2022-06-21 |
Family
ID=74349104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010929026.XA Active CN112268730B (en) | 2020-09-07 | 2020-09-07 | Sampling method for multi-line cutting of reinforcing steel bars |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112268730B (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60170513A (en) * | 1984-02-14 | 1985-09-04 | Kobe Steel Ltd | Method and equipment for collecting sample in steel bar rolling |
| CN1669686A (en) * | 2005-01-20 | 2005-09-21 | 唐文林 | Process for rolling four-line split ribbed reinforcing steel bar |
| CN201191177Y (en) * | 2008-04-18 | 2009-02-04 | 陈炳生 | Dimension detection apparatus for multiple cutting round steel and reinforcing steel bar |
| CN101979230A (en) * | 2010-05-21 | 2011-02-23 | 北京天科合达蓝光半导体有限公司 | Method for cutting silicon carbide crystal in sections by using multi-line cutter |
| CN103334544A (en) * | 2013-06-14 | 2013-10-02 | 江苏永钢集团有限公司 | Reinforcing steel bar with segmentation mark |
| CN103543052A (en) * | 2013-10-18 | 2014-01-29 | 太原钢铁(集团)有限公司 | Preparation method of Z-directional tensile sample of steel plate |
| CN103706632A (en) * | 2013-12-20 | 2014-04-09 | 天津钢铁集团有限公司 | Slitting rolling method of 13mm deformed steel bar |
| CN105067371A (en) * | 2015-08-10 | 2015-11-18 | 江苏永钢集团有限公司 | Flush cutting sampling device of finished steel bars |
| CN105181427A (en) * | 2015-08-11 | 2015-12-23 | 攀钢集团成都钢钒有限公司 | Detection method and characterization method of microporous defects of cold-drawn seamless steel pipe |
| CN108593332A (en) * | 2018-06-29 | 2018-09-28 | 机械科学研究总院海西（福建）分院有限公司 | Automatic sampling machine people, bar automatic sampling equipment and sampling method comprising it |
| CN109097690A (en) * | 2018-09-14 | 2018-12-28 | 柳州钢铁股份有限公司 | The production method of HRB400 reinforcing bar used for high-speed railway |
| CN110646234A (en) * | 2019-10-29 | 2020-01-03 | 柳州钢铁股份有限公司 | Metallographic wire sample sampler |
| CN110814035A (en) * | 2019-10-24 | 2020-02-21 | 广东韶钢松山股份有限公司 | Deformed steel bar finished product sampling control system and method |
-
2020
- 2020-09-07 CN CN202010929026.XA patent/CN112268730B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60170513A (en) * | 1984-02-14 | 1985-09-04 | Kobe Steel Ltd | Method and equipment for collecting sample in steel bar rolling |
| CN1669686A (en) * | 2005-01-20 | 2005-09-21 | 唐文林 | Process for rolling four-line split ribbed reinforcing steel bar |
| CN201191177Y (en) * | 2008-04-18 | 2009-02-04 | 陈炳生 | Dimension detection apparatus for multiple cutting round steel and reinforcing steel bar |
| CN101979230A (en) * | 2010-05-21 | 2011-02-23 | 北京天科合达蓝光半导体有限公司 | Method for cutting silicon carbide crystal in sections by using multi-line cutter |
| CN103334544A (en) * | 2013-06-14 | 2013-10-02 | 江苏永钢集团有限公司 | Reinforcing steel bar with segmentation mark |
| CN103543052A (en) * | 2013-10-18 | 2014-01-29 | 太原钢铁(集团)有限公司 | Preparation method of Z-directional tensile sample of steel plate |
| CN103706632A (en) * | 2013-12-20 | 2014-04-09 | 天津钢铁集团有限公司 | Slitting rolling method of 13mm deformed steel bar |
| CN105067371A (en) * | 2015-08-10 | 2015-11-18 | 江苏永钢集团有限公司 | Flush cutting sampling device of finished steel bars |
| CN105181427A (en) * | 2015-08-11 | 2015-12-23 | 攀钢集团成都钢钒有限公司 | Detection method and characterization method of microporous defects of cold-drawn seamless steel pipe |
| CN108593332A (en) * | 2018-06-29 | 2018-09-28 | 机械科学研究总院海西（福建）分院有限公司 | Automatic sampling machine people, bar automatic sampling equipment and sampling method comprising it |
| CN109097690A (en) * | 2018-09-14 | 2018-12-28 | 柳州钢铁股份有限公司 | The production method of HRB400 reinforcing bar used for high-speed railway |
| CN110814035A (en) * | 2019-10-24 | 2020-02-21 | 广东韶钢松山股份有限公司 | Deformed steel bar finished product sampling control system and method |
| CN110646234A (en) * | 2019-10-29 | 2020-01-03 | 柳州钢铁股份有限公司 | Metallographic wire sample sampler |
Non-Patent Citations (4)
| Title |
|---|
| 中华人民共和国国家质量监督检验检疫总局、中国国家标准化管理委员会: "钢筋混凝土用钢 第2部分：热轧带肋钢筋", 《中华人民共和国国家标准》 * |
| 王长生: "钢筋多线切分轧制操作技术优化", 《轧钢》 * |
| 蒋子龙: "φ12mm热轧带肋钢筋四切分轧制开发实践", 《山东冶金》 * |
| 赵贤平: "铌微合金化HRB400E高强钢筋CCT曲线测定及应用", 《中国冶金》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112268730B (en) | 2022-06-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3541564B1 (en) | Method and device for producing a continuous strip-shaped composite material | |
| DE2654702C3 (en) | Method for improving the strength and toughness properties of an austenitic steel alloy | |
| WO2014178099A1 (en) | Untempered steel material | |
| US20100252149A1 (en) | Hot rolled dual phase steel strip having features of a cold rolled strip | |
| CN112268730B (en) | Sampling method for multi-line cutting of reinforcing steel bars | |
| CN112139240A (en) | Production method for reducing performance line difference of reinforcing steel bar | |
| DE112006003562B4 (en) | Method for joining high-carbon steel to endless hot rolling | |
| CN110076207A (en) | A kind of production method for reducing wide plate edge and folding incidence | |
| EP3797006B1 (en) | Casting-rolling system for batch and continuous operation | |
| EP2906369B1 (en) | Width-altering system for strip-shaped rolled material | |
| Dodd et al. | The causes of edge cracking in cold rolling | |
| KR102427244B1 (en) | Steel product and method of producing the product | |
| DE3628712C2 (en) | ||
| DE10140307C1 (en) | Method and device for producing steel profile bars for linear guide elements | |
| US20160016211A1 (en) | System and methof for fabricating hot-rolled semi light weight i-form beam | |
| EP0156405B2 (en) | Roll forming procedure with slitting of angle bars and T-beams | |
| Pascoe | Directional effects of prestrain in steel | |
| EP3713684A1 (en) | Flat product package, method for producing a material composite, and use thereof | |
| EP3030365A1 (en) | Method for producing strips made of steel, in particular for producing cutting and machining tools having improved service life | |
| EP2460596A1 (en) | Method for producing high-strength, low alloy steel with copper | |
| DE3023723A1 (en) | Continuously cast and hot rolled semi-finished steel prods. - using controlled cooling and heat in slab for hot rolling without causing defects in prods. | |
| CN112828036B (en) | Method for improving low-temperature impact toughness of thick high-strength steel | |
| JP7156220B2 (en) | Heavy steel plate with excellent toughness, its manufacturing method, and steel slab used as raw material for thick steel plate | |
| Dekate et al. | Study and minimization of surface defects on bars and wire rod originated in continuous cast billets | |
| DE102015115105B4 (en) | Method for producing switching modules in a motor vehicle transmission |
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 |