CN1158987A - Production process of notch shock sample - Google Patents
Production process of notch shock sample Download PDFInfo
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- CN1158987A CN1158987A CN 96120484 CN96120484A CN1158987A CN 1158987 A CN1158987 A CN 1158987A CN 96120484 CN96120484 CN 96120484 CN 96120484 A CN96120484 A CN 96120484A CN 1158987 A CN1158987 A CN 1158987A
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Abstract
The production process of notch shock calibrating sample includes steel plate production of smelting, casting and rolling as well as sample production. The steel plate has, other than Fe, C in 0.02-0.09 wt%, S less than 0.01 wt% and inevitable impurity in its chemical components. During the sample production, the transverse middle part of plate with less segregation is used with the lengthwise direction of sample being the rolling direction of plate. The present invention changes the material for sample from traditional medium-carbon Ni-Cr-Mo alloy steel into low-carbon steel and makes its variation coefficient of shock work reach 1-3% through routine smelting process by using the 'up-to-platform' property of the shock work of low-carbon steel at room temp or higher temp.
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 measure ballistic work with the standard block of hardness of known ballistic work indirectly, and whether the numerical difference between of seeing its ballistic work is in the scope of regulation permission.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, 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 is to be prepared burden by required composition by raw material, and through smelting, casting, the rolling steel that obtain desired thickness, the chemical analysis of steel (weight %) is: C0.02～0.09, and S＜0.01, all the other are Fe and 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 best composition (weight %) of steel is: C0.06, and S＜0.008, all the other are Fe and 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 Make the open impact standard specimen with the mild steel steel plate, its chemical analysis (% by weight) is: C:0.02～0.09, 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, is that the ballistic work of considering mild steel exists Room temperature and above temperature have plasticity very stably " platform ", for high purity, The fluctuation range of the material impact value that segregation is little very little (littler than medium carbon steel), but begin crisp During sex reversal, impact value reduces very fast. And for medium carbon steel, the Transition of Brittleness district is more flat Slow, need to cooperate complicated smelting process to obtain high-purity, the little material of segregation, just can make mark The coefficient of variation of sample reaches＜and 5%. When carrying out verification, the impact machine requires under 20 ℃ of the room temperatures, Just in time be positioned at the upper mounting plate part of mild steel ballistic work, therefore select this material can make impact The coefficient of variation of merit is very little.
Among the present invention, C is 0.02～0.09%, (weight, as follows), and this carbon content is lower than The phosphorus content of " H " point in the iron-carbon diagram makes this steel reaches Peritectic Temperature when continuous casting before Just form homogeneous structure, and so that solidification products tissue and uniform ingredients, the segregation tendency is little, To the ballistic work coefficient of variation of shock sample be reduced.
S＜0.01, S will exist with the MnS form on final products, be the sample that impacts Impact the key factor of fluctuation, reduce sulfur content, just can reduce the amount of MnS, will reduce punching Hit the ballistic work coefficient of variation of standard specimen.
In order to obtain better effect, the present invention carries out Ageing Treatment to the standard specimen for preparing, Can make like this interstitial atom find low-energy position, be in the Thermodynamically stable state, grow After the time placement, the changing value of its impact value is littler, can make a manufacture bigger, reduces Manufacturing cost.
The present invention adopts the impact of collision standard specimen, namely with the length of rolling direction as shock sample Direction is because MnS exists with the strip form along rolling direction, can reduce side knock The ballistic work of sample also can increase the coefficient of variation of ballistic work, and to the impact of collision sample Therefore affect littlelyr, 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 C0.06, the mild carbon steel of S0.007 (weight %), converter smelting, obtain wide 1500mm steel plate through continuous casting, its positive and negative line of segragation is far from edges of boards edge＜200mm after testing, 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 that carbon closes in the Ni-Cr-Mo of shock sample of the present invention and France, Japan development The gold steel drift hits ballistic work and the variability contrast of standard specimen.
Compared with prior art, the present invention adopts the mild steel steel plate to replace nickel of the prior art The chrome molybdenum medium carbon alloy steel is made shock sample, takes full advantage of the " upper flat of mild steel impact value Platform " this characteristic, can obtain by simple process for smelting the impact mark of better performances Sample, 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 of 5 samples | Size | ||
| S5(J) | ％Ec | Length * thick * wide (mm) | Breach (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 (7)
1. production process of notch shock sample, be to be prepared 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: steel chemical analysis (weight %) is: C0.02～0.09, S＜0.01, all the other are Fe and unavoidable impurities.
2. method according to claim 1 is characterized in that: the steel plate of described steel for obtaining through continuous casting, hot continuous rolling.
3. method according to claim 2 is characterized in that: the less part of middle broad ways segregation of the steel plate that obtains is prepared standard specimen.
4. 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.
5. method according to claim 1 is characterized in that: the best composition (weight %) of described steel is: C0.06, and S＜0.008, all the other are Fe and unavoidable impurities.
6. according to claim 2 or 3 described methods, it is characterized in that: the length direction of described standard specimen is the rolling direction of steel plate.
7. method according to claim 1 is characterized in that: by being processed into the standard specimen that different sectional dimensions obtains different impact values.
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 true CN1158987A (en) | 1997-09-10 |
| CN1074543C CN1074543C (en) | 2001-11-07 |
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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 |
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| Country | Link |
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| CN (1) | CN1074543C (en) |
Cited By (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 |
-
1996
- 1996-11-15 CN CN 96120484 patent/CN1074543C/en not_active Expired - Fee Related
Cited By (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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| Publication number | Publication date |
|---|---|
| CN1074543C (en) | 2001-11-07 |
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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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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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