CN1074543C - Production process of notch shock sample - Google Patents
Production process of notch shock sampleInfo
- Publication number
- CN1074543C CN1074543C CN 96120484 CN96120484A CN1074543C CN 1074543 C CN1074543 C CN 1074543C CN 96120484 CN96120484 CN 96120484 CN 96120484 A CN96120484 A CN 96120484A CN 1074543 C CN1074543 C CN 1074543C
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- steel plate
- standard specimen
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Abstract
The present invention relates to a manufacturing method for checking a standard sample of gap impact for an impact testing machine. A steel plate with desired thickness is obtained through smelting, casting and rolling and comprises chemical components (wt%): 0.02 to 0.09 of C, S which is smaller than 0.01, and Fe and unavoidable impurities as the rest. A part at the middle part of the steel plate, which has small segregation along the direction of width, is used for preparing a standard sample, and the direction of the length of the standard sample is the direction of the rolling of the steel plate. The material of the standard sample is changed into low carbon steel from intermediate carbon alloy structural steel with high-purity nickel chrome molybdenum, the upper mounting plate characteristic of the impact work of the low carbon steel at room temperature and high temperature is used, and a general smelting process can be used for causing the variation coefficient of the impact work of the material to achieve 1 to 3%.
Description
The present invention relates to the manufacture method of a kind of verification impact testing machine with the notch shock calibration sample.
At present, the method of calibration of impact testing machine is divided into the direct method of measurement and indirect check addition, the direct method of measurement is promptly measured pendulum length, pendulum heavily waits parameter, and check addition is to know that with oneself the standard block of hardness of ballistic work measures ballistic work indirectly, and whether the numerical difference between of seeing its ballistic work is in the scope that regulation allows.Past generally adopts not the sample of opening to demarcate, all trend towards adopting gap shock sample verification impact testing machine on the recent international, Nippon Standard JIS B7740 " standard sample of impact testing machine " for example, accepted standard EN10045-2 of European Union " verification balance weight impact testing machine " and international standard ISO-DIS442 " verification balance weight impact testing machine ", ISO-DIS12736 " summer of verification balance weight impact testing machine is than the preparation and the evaluation of V-type reference coupon " etc. has made corresponding regulation, the coefficient of variation of requirement standard ballistic work (being standard value/mean value) is lower than 5%, owing to require tighter to the coefficient of variation, therefore necessarily require the material of standard specimen very even, the U.S., the high-purity nickel chrome molybdenum medium carbon structural alloy steel that Japan and European Union all adopt Unite States Standard (USS) MIL-STD2154-AAA level to provide, composition is: C0.4%, Ni1.8%, Cr0.8%, Mo0.25%, Mn0.7%, all the other are Fe, in order to obtain the very high raw material of uniformity coefficient, the external smelting process that adopts usually is: steel-making is after vacuum outgas obtains die casting behind the high-purity molten steel, reduce ingotism through vacuum arc remelting again, obtain fine and close steel ingot by vacuum die casting then, through rolling, be processed into shock sample by required size, the standard specimen that obtains is through quenching, tempering heat treatment, obtain different impact values by adjusting different temperatures, adopt the shock sample manufacturing process of this nickel chromium triangle molybdenum medium carbon alloy steel processing very complicated, equipment performance requirement to smelting and subsequent treatment is very high, so manufacturing cost is very high.
The objective of the invention is by selecting another alloy material, make the technology of the shock sample of making desired properties very simple, thereby reduce manufacturing cost greatly.
The object of the present invention is achieved like this:
A kind of production process of notch shock sample, be to prepare burden by required composition by raw material, through smelting, casting, the rolling steel that obtain desired thickness, steel be: the percentage by weight 0.02 to 0.09 of carbon, the percentage by weight of sulphur is less than 0.01, the percentage by weight of iron is greater than 99.7%, and all the other are unavoidable impurities.
The steel plate of steel for obtaining through continuous casting, hot continuous rolling.
The less part of middle broad ways segregation of the steel plate that obtains is prepared standard specimen.
Standard specimen is incubated 4～40 hours down in 50～200 ℃ and carries out Ageing Treatment.
The optimum chemical composition of steel is: the percentage by weight 0.06% of carbon, the percentage by weight of sulphur are less than 0.01%, and the percentage by weight of iron is greater than 99.7%%, and all the other are unavoidable impurities.
The length direction of standard specimen is the rolling direction of steel plate.
Obtain different ballistic works by standard specimen being processed into different size.
Below in conjunction with accompanying drawing in detail the present invention is described in detail.
Accompanying drawing is the influence of different carbon content impact transition temperatures in ferrite/pearlitic steel.
Key of the present invention is to select another alloy material to make shock sample, namely adopts the mild steel steel plate to make the open impact standard specimen, and its chemical analysis (% by weight) is: C:0.02～0.09, and S＜0.01, all the other are Fe and inevitable impurity. Referring to accompanying drawing, the present invention adopts the mild steel steel plate to make shock sample, that the ballistic work of considering mild steel has one very stably " platform " at room-temperature zone, the fluctuation range very little (less than medium carbon steel) of the material impact value that high purity, segregation are little, but during the beginning Transition of Brittleness, impact value reduces very fast. And for medium carbon steel, the Transition of Brittleness district is milder, need to cooperate complicated smelting process to obtain high-purity, the little material of segregation, just the coefficient of variation of standard specimen is reached＜5%, when carrying out verification, the impact machine requires to carry out under the room temperature, just in time be positioned at the upper mounting plate part of mild steel ballistic work, therefore select this material can make the coefficient of variation of ballistic work very little.
Among the present invention, the percentage by weight of C is 0.02～0.09%, (weight, as follows), this carbon content is lower than the phosphorus content of " H " in iron-carbon diagram point, makes this steel just form homogeneous structure reach Peritectic Temperature when continuous casting before, and so that solidification products tissue and uniform ingredients, the segregation tendency is little, will the ballistic work coefficient of variation of shock sample be reduced.
The percentage by weight of sulphur is less than 0.01, and sulphur will exist with the MnS form on final products, is to impact the key factor that sample impacts fluctuation, reduces sulfur content, just can reduce the amount of MnS, will reduce the ballistic work coefficient of variation of shock sample.
In order to obtain better effect, the present invention carries out Ageing Treatment to the standard specimen for preparing, and can make like this interstitial atom find low-energy position, be in thermodynamics than stable state, after long-time the placement, the changing value of its impact value is less, can make a manufacture larger, reduce manufacturing cost.
The present invention adopts the impact of collision standard specimen, namely with the length direction of rolling direction as shock sample, because MnS exists with the strip form along rolling direction, can reduce the ballistic work of lateral impact sample, also can increase the coefficient of variation of ballistic work, and less on the impact of impact of collision sample, therefore adopt the impact of collision standard specimen can reduce the ballistic work coefficient of variation.
The present invention obtains different impact toughness value by the sectional dimension that changes standard specimen.
Introduce embodiments of the invention below in conjunction with effect.
The employing composition is that the number percent of carbon is 0.06, the number percent of sulphur is the mild carbon steel of 0.007 (weight %), converter smelting, obtain wide 1500mm steel plate through continuous casting, after testing its positive and negative line of segragation apart from panel edges less than 200mm, obtain the steel plate of wide 1800mm through hot continuous rolling, these steel plate both sides are respectively cut wide 300mm after, the low segregation part in the centre that obtains promptly can be used to prepare standard specimen.
Table 1 has provided shock sample of the present invention and ballistic work and variability contrast French, the Japanese nickel chromium triangle molybdenum medium carbon alloy steel shock sample of developing.
Compared with prior art, the present invention adopts the mild carbon steel steel plate to replace nickel chromium triangle molybdenum medium carbon alloy steel of the prior art to make shock sample, make full use of " upper mounting plate " this characteristic of mild carbon steel impact value, can obtain the shock sample of better performances by simple smelting processing technology, its coefficient of variation is 1～3%, is significantly less than 5% of standard code.
Table 1.
| Sample | Ballistic work average Ec (joule) | Standard deviation S (joule) | The standard deviation S5 of 5 samples (J) %Ec | Size length * thick * wide breach (mm) (mm) | ||
| European standard V-notch standard specimen | 25.5 74.1 123.3 | 2.01 2.46 9.92 | 0.9 1.1 2.65 | 3.53 1.48 2.15 | 55×10×10 | 2 |
| French Standard V-notch standard specimen | 21.60 71.66 124.81 | 1.685 2.250 3.950 | 0.753 1.006 1.766 | 3.49 1.40 1.41 | 55×10×10 | 2 |
| Standard specimen of the present invention | 122.98 192.71 293.52 | 2.88 2.69 1.86 | 1.288 1.203 0.845 | 1.05 0.624 0.288 | 55×10×5 55×10×7.5 55×10×10 | 2 |
Claims (6)
1. production process of notch shock sample, be to prepare burden by required composition by raw material, prepare standard specimen through smelting, casting, the rolling steel that obtain desired thickness, it is characterized in that: the steel plate chemical analysis is: the percentage by weight 0.02 to 0.09% of carbon, the percentage by weight of sulphur is less than 0.01%, the percentage by weight of iron is greater than 99.7%, and all the other are unavoidable impurities, the steel plate of above-mentioned steel for obtaining through continuous casting, hot continuous rolling.
2. method according to claim 1 is characterized in that: the less part of middle broad ways segregation of the steel plate that obtains is prepared standard specimen.
3. method according to claim 1 is characterized in that: described standard specimen is incubated 4～40 hours down in 50～200 ℃ and carries out Ageing Treatment.
4. method according to claim 1 is characterized in that: the best composition of described steel is: the percentage by weight 0.06% of carbon, the percentage by weight of sulphur are less than 0.08%, and the percentage by weight of iron is greater than 99.7%, and all the other are unavoidable impurities.
5. method according to claim 1 and 2 is characterized in that: the length direction of described standard specimen is the rolling direction of steel plate.
6. method according to claim 1 is characterized in that: the standard specimen that obtains different impact values by the sample that is processed into different sectional dimensions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96120484 CN1074543C (en) | 1996-11-15 | 1996-11-15 | Production process of notch shock sample |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96120484 CN1074543C (en) | 1996-11-15 | 1996-11-15 | Production process of notch shock sample |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1158987A CN1158987A (en) | 1997-09-10 |
| CN1074543C true CN1074543C (en) | 2001-11-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96120484 Expired - Fee Related CN1074543C (en) | 1996-11-15 | 1996-11-15 | Production process of notch shock sample |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1074543C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101984335A (en) * | 2010-09-20 | 2011-03-09 | 南京钢铁股份有限公司 | Method of analyzing product structure and properties by the utilization of samples prepared with thermo-stimulated test |
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1996
- 1996-11-15 CN CN 96120484 patent/CN1074543C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1158987A (en) | 1997-09-10 |
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| Date | Code | Title | Description |
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| C10 | Entry into substantive examination | ||
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| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: BAOSHAN IRON & STEEL CO., LTD. Free format text: FORMER NAME OR ADDRESS: SHANGHAI BAO STEEL GROUP IRON AND STEEL CO LTD Owner name: SHANGHAI BAO STEEL GROUP IRON AND STEEL CO LTD Free format text: FORMER NAME OR ADDRESS: BAOSHAN STEEL GROUP IRON AND STEEL CO LTD |
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| CP03 | Change of name, title or address |
Address after: 201900, Fujin Road, Shanghai, Baoshan District orchard Patentee after: BAOSHAN IRON & STEEL Co.,Ltd. Address before: 200122 No. 370 Pu circuit, Shanghai, Pudong New Area Patentee before: BAOSHAN IRON & STEEL CO.,LTD. Address after: 200122 No. 370 Pu circuit, Shanghai, Pudong New Area Patentee after: BAOSHAN IRON & STEEL CO.,LTD. Address before: 201900 No. 1, Middle Road, Baoshan District, Shanghai Patentee before: Baosteel Group Corporation |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20011107 Termination date: 20151115 |
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| EXPY | Termination of patent right or utility model |