CN110082233A - A kind of pre-detection method for 18Cr2Ni4WA steel processing fastener Brinell hardness - Google Patents
A kind of pre-detection method for 18Cr2Ni4WA steel processing fastener Brinell hardness Download PDFInfo
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- CN110082233A CN110082233A CN201910270021.8A CN201910270021A CN110082233A CN 110082233 A CN110082233 A CN 110082233A CN 201910270021 A CN201910270021 A CN 201910270021A CN 110082233 A CN110082233 A CN 110082233A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/40—Investigating hardness or rebound hardness
- G01N3/42—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/40—Investigating hardness or rebound hardness
- G01N3/42—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid
- G01N3/44—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid the indentors being put under a minor load and a subsequent major load, i.e. Rockwell system
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0076—Hardness, compressibility or resistance to crushing
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Abstract
The invention discloses a kind of pre-detection methods for 18Cr2Ni4WA steel processing fastener Brinell hardness, before carrying out 18Cr2Ni4WA steel processing fastener Brinell hardness (HBW 10/3000) detection, first carry out the processing fastener Rockwell hardness HRC detection of 18Cr2Ni4WA steel, and the corresponding relationship between fastener Rockwell hardness acceptability limit and Brinell hardness acceptability limit is processed according to 18Cr2Ni4WA steel, judge whether 18Cr2Ni4WA steel processing fastener Brinell hardness (HBW 10/3000) is qualified in advance and whether needs further progress 18Cr2Ni4WA steel processing fastener Brinell hardness (HBW 10/3000) detection.The present invention improves checkability, reduces costs.
Description
Technical field
The present invention relates to metal hardness detection fields, especially provide a kind of for 18Cr2Ni4WA steel processing fastener Bu Shi
The pre-detection method of hardness.
Background technique
Hardness is one of the important indicator of metal material mechanical performance, and hardness determination is to judge metal material or product zero
A kind of means of part quality, the most common hardness has Brinell hardness, Rockwell hardness and Vickers hardness, below to Brinell hardness test
And Rockwell hardness test is described further.
1, Brinell hardness test
Brinell hardness test principle: applying test force pressing in sample surface (see Fig. 1) to the sintered carbide ball of certain diameter,
After providing the retention time, removal test force measures the impression diameter of specimen surface, obtains indentation surface product (S), Brinell hardness
Calculation formula is as follows:
Wherein: D: hardened steel ball diameter (mm)；
F: test force (N)；
d1, d2: in the impression diameter (mm) that mutually perpendicular direction measures；
H: depth of cup (mm)；
2, Rockwell hardness test
Rockwell hardness test principle: pressure head (diamond circular cone, sintered carbide ball) is pressed into Fig. 2 pressing in sample in two steps
Surface, after providing the retention time, removal master trip power measures the remaining depth of cup h under first test force, Rockwell apparatus
It is as follows to calculate formula:
Wherein: N: to the hardness of drift slide；
H: removal master trip power, the remaining depth of impression under initial test load；
S: the given unit marked.
1 is in initial test load F in Fig. 20Under compression distance；2 is by master trip power F1Caused compression distance；3 be to unload
Except the elastic recovery depth after master trip power F1；4 be remaining compression distance h；5 be specimen surface；6 be measurement datum；7 be pressure
Head position.
For metal material Brinell hardness test and metal material Rockwell hardness test, 231 He of government test standard GB/T
GB/T 231.1 is described in detail.GB/T 231 " metal material Brinell hardness test " is divided into four parts: first part is
Test method；Second part is scleroscopic inspection and calibration；Part III is the calibration of standard block of hardness；Part IV is hard
Angle value table.GB/T 231.1 " metal material Rockwell hardness test " is divided into three parts: first part be test method (A, B, C, D,
E, F, G, H, K, N, T scale)；Second part is the inspection and calibration of hardometer (A, B, C, D, E, F, G, H, K, N, T scale)；The
Three parts are the calibration of standard block of hardness (A, B, C, D, E, F, G, H, K, N, T scale).
Wherein: standard block of hardness is used for scleroscopic daily indirect inspection, belongs to hardness determination experiment work consumptive material.Standard
Block of hardness is the equal of the homogenieity for guaranteeing block of hardness using quality material, specialized processes manufacture, structure stability and surface hardness
Even property.It, using ordinary test method as defined in GB/T, should be demarcated on Standard Machine in (23 ± 5) DEG C temperature range, with
Its calibration value examines scleroscopic accuracy and precision.
Test force in Brinell hardness test under different condition should configure corresponding standard block of hardness, common experimental condition
Such as table 1:
Test force under 1 Brinell hardness different condition of table
Common rockwell hardness scale such as table 2 in Rockwell hardness test:
The common rockwell hardness scale of table 2
| Rockwell hardness scale | Hardness symbol | Pressure head type | First test force F0/N | Master trip power F/N |
| A | HRA | Diamond circular cone | 98.07 | 490.3 |
| B | HRB | Diameter 1.5875mm ball | 98.07 | 882.5 |
| C | HRC | Diamond circular cone | 98.07 | 1373 |
In production testing, fastener is processed for 18Cr2Ni4WA steel, supply conditions requires to be Brinell hardness (HBW10/
3000) examine, experiment condition be Φ 10mm pressure head diameter, 3000kg test force, Brinell hardness acceptance value range be 325HBW~
355HBW.If ball hardness number not in acceptability limit, change alloying component proportion or system of heat treatment process again, then
It examines, it generally will be by debugging and detecting several times, until 18Cr2Ni4WA steel processing fastener meets supply conditions, Brinell hardness
(HBW 10/3000) is qualified.
For Rockwell hardness HRC detection, Brinell hardness (HBW 10/3000) detection increases since it is desired that impression measurement
The step for having added measurement, reduces checkability, while high to specimen surface smoothness requirements, also reduces working efficiency；
Its impression diameter big (diameter about 3.3mm), Homes Using TV is low, standard block of hardness utilization rate is low, and testing cost is high, every piece of standard hardness
Block can only at most use 7 times, further improve testing cost.And Rockwell hardness HRC is detected, quick rapid, direct-reading, to sample
Surface requirements are lower, and detection efficiency is high；Rockwell hardness standard block of hardness utilization rate is high, and testing cost is low, and impression diameter is small,
33.0HRC impression diameter about 0.8mm or so, Rockwell hardness HRC intermediate value Rockwell hardness every piece of energy of block use 30 times or more, detection at
This is cheap.
In conclusion it is contemplated that fastener Brinell hardness (HBW 10/3000) can be processed prior to 18Cr2Ni4WA steel
Rockwell hardness HRC detection, i.e. pre-detection are done before detection, can significantly improve test efficiency, reduce experimentation cost.But existing " GB/
1172 ferrous metal interconversion of hardness and strength value of T " national standard still without 18Cr2Ni4WA steel for process component Rockwell it is hard
Degree and Brinell hardness scaled value, and experimental data also turns out, and 18Cr2Ni4WA steel processes fastener Rockwell hardness and Bu Shi is hard
It spends respective value and Rockwell hardness and Brinell hardness scaled value listed in the standard is not identical, have differences, i.e., right
18Cr2Ni4WA steel is processed in the pre-detection of fastener Brinell hardness (HBW10/3000), and the standard is not applicable.
Therefore, prior to doing Rockwell hardness before 18Cr2Ni4WA steel processing fastener Brinell hardness (HBW 10/3000) detection
HRC detection, and find out between 18Cr2Ni4WA steel processing fastener Rockwell hardness acceptability limit and Brinell hardness acceptability limit
Corresponding relationship is extremely important.
Summary of the invention
The purpose of the present invention is to provide a kind of pre-detection sides for 18Cr2Ni4WA steel processing fastener Brinell hardness
Method, can be with the effective solution above problem.
The technical scheme is that a kind of pre-detection side for 18Cr2Ni4WA steel processing fastener Brinell hardness
Method first carries out 18Cr2Ni4WA steel before carrying out 18Cr2Ni4WA steel processing fastener Brinell hardness (HBW 10/3000) detection
Fastener Rockwell hardness HRC detection is processed, and fastener Rockwell hardness acceptability limit and Bu Shi are processed according to 18Cr2Ni4WA steel
Corresponding relationship between hardness acceptability limit judges that 18Cr2Ni4WA steel processes fastener Brinell hardness (HBW 10/3000) in advance
It is whether qualified and whether need further progress 18Cr2Ni4WA steel processing fastener Brinell hardness (HBW 10/3000) detection.
Our laboratory statistical datas are as follows: 18Cr2Ni4WA steel processes the qualification of fastener Brinell hardness (HBW10/3000)
Range 325HBW~355HBW, corresponding Rockwell hardness range are as follows: 32.5HRC~35.5HRC expands in order to avoid qualified missing inspection
Rockwell hardness acceptability limit be 31.5HRC~36.5HRC, if pre-detection Rockwell hardness number range 31.5HRC~
36.5HRC, within, then continue Brinell hardness detection, conversely, corresponding Brinell hardness detects except acceptability limit, just not
Brinell hardness detection must be carried out again.Reach raising checkability, reduces the pre-detection purpose of cost.
Step carries out the pre-detection method through the following experiment:
The inspection and calibration of the first step, Rockwell apparatus:
According to scleroscopic inspection and calibration method in GB/T 230.1-2009 " metal material Rockwell hardness test ", take
Standard Rockwell hardness block 29.3HRC beats 2 points of Rockwell hardness, is averaged, and measurement average value should be with the standard on calibrated bolck certificate
Value 29.3HRC is differed within allowable error (± 1.5), and obtains correction value；If exceeding error range, commissioning device,
Until equipment is qualified, correction value is obtained；
Second step carries out Rockwell hardness detection:
Rockwell hardness HRC detection is carried out to 18Cr2Ni4WA steel processing fastener sample, be averaged, and to inspection at 3 points
As a result it is modified；
Third step judges whether 18Cr2Ni4WA steel processing fastener Brinell hardness (HBW 10/3000) is qualified and is in advance
It is no to need further progress 18Cr2Ni4WA steel processing fastener Brinell hardness (HBW 10/3000) detection:
18Cr2Ni4WA steel processing fastener sample is subjected to the correction value after Rockwell hardness HRC detection and compares Rockwell hardness
HRC detects acceptability limit: 31.5HRC~36.5HRC, if within acceptability limit, then detect Brinell hardness (HBW 10/
3000)；If not within acceptability limit, determine test result be it is unqualified, then need not detect Brinell hardness (HBW again
10/3000)。
The present invention has following beneficial effect:
The present invention is directed to 18Cr2Ni4WA steel processing fastener Brinell hardness (HBW 10/3000) detection, is a kind of logical
Cross Rockwell hardness HRC detection come judge in advance its Brinell hardness (HBW 10/3000) whether He Ge pre-detection method, improve inspection
Efficiency is tested, is reduced costs.
Detailed description of the invention
Fig. 1 is Brinell hardness test schematic diagram；
Fig. 2 is Rockwell hardness test schematic diagram.
Specific embodiment
The present invention will be described in detail with reference to the accompanying drawings and examples.
Embodiment 1
It is a kind of for 18Cr2Ni4WA steel processing fastener Brinell hardness pre-detection method, through the following experiment step into
Row:
The inspection and calibration of the first step, Rockwell apparatus:
According to scleroscopic inspection and calibration method in GB/T 230.1-2009 " metal material Rockwell hardness test ", take
Standard Rockwell hardness block 29.3HRC beats 2 points of Rockwell hardness, is averaged, and measurement average value is 30.0HRC, demonstrate,proves with calibrated bolck
Standard value 29.3HRC on book differs the correction value 0.7 within allowable error (± 1.5)；
Second step carries out Rockwell hardness detection:
Rockwell hardness HRC detection is carried out to 18Cr2Ni4WA steel processing fastener sample, 3 testing results are respectively:
33.5HRC, 34.0HRC, 34.5HRC, average value 34.0HRC, are then modified inspection result, and correction result is
33.3HRC(34.0HRC-0.7HRC)；
Third step judges whether 18Cr2Ni4WA steel processing fastener Brinell hardness (HBW 10/3000) is qualified and is in advance
It is no to need further progress 18Cr2Ni4WA steel processing fastener Brinell hardness (HBW 10/3000) detection:
18Cr2Ni4WA steel processing fastener sample is subjected to the correction value after Rockwell hardness HRC detection and compares Rockwell hardness
HRC detects acceptability limit: 31.5HRC~36.5HRC, because 33.3HRC is within acceptability limit, then detects Brinell hardness
(HBW 10/3000), ball hardness number 334HBW, really within the scope of acceptability limit 325HBW~355HBW.
Embodiment 2
It is a kind of for 18Cr2Ni4WA steel processing fastener Brinell hardness pre-detection method, through the following experiment step into
Row:
The inspection and calibration of the first step, Rockwell apparatus:
According to scleroscopic inspection and calibration method in GB/T 230.1-2009 " metal material Rockwell hardness test ", take
Standard Rockwell hardness block 29.3HRC beats 2 points of Rockwell hardness, is averaged, and measurement average value is 30.0HRC, demonstrate,proves with calibrated bolck
Standard value 29.3HRC on book differs the correction value 0.7 within allowable error (± 1.5)；
Second step carries out Rockwell hardness detection:
Rockwell hardness HRC detection is carried out to 18Cr2Ni4WA steel processing fastener sample, 3 testing results are respectively:
31.5HRC, 32.0HRC, 32.5HRC, average value 32.0HRC, are then modified inspection result, and correction result is
31.3HRC(32.0HRC-0.7HRC)；
Third step judges whether 18Cr2Ni4WA steel processing fastener Brinell hardness (HBW 10/3000) is qualified and is in advance
It is no to need further progress 18Cr2Ni4WA steel processing fastener Brinell hardness (HBW 10/3000) detection:
18Cr2Ni4WA steel processing fastener sample is subjected to the correction value after Rockwell hardness HRC detection and compares Rockwell hardness
HRC detects acceptability limit: 31.5HRC~36.5HRC, because 31.3HRC is within acceptability limit, it is determined that test result
It is unqualified, it is not necessary to detect Brinell hardness (HBW 10/3000) again.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all according to the present invention
Equivalent change or modification made by Spirit Essence, should be covered by the protection scope of the present invention.
Claims (3)
1. a kind of pre-detection method for 18Cr2Ni4WA steel processing fastener Brinell hardness, which is characterized in that carrying out
Before 18Cr2Ni4WA steel processes fastener Brinell hardness (HBW 10/3000) detection, the processing fastening of 18Cr2Ni4WA steel is first carried out
Part Rockwell hardness HRC detection, and fastener Rockwell hardness acceptability limit and Brinell hardness qualification are processed according to 18Cr2Ni4WA steel
Corresponding relationship between range judges whether 18Cr2Ni4WA steel processing fastener Brinell hardness (HBW 10/3000) is qualified in advance
And whether need further progress 18Cr2Ni4WA steel processing fastener Brinell hardness (HBW 10/3000) detection.
2. a kind of pre-detection method for 18Cr2Ni4WA steel processing fastener Brinell hardness described in accordance with the claim 1,
It is characterized in that, the 18Cr2Ni4WA steel processing fastener Rockwell hardness acceptability limit is 31.5HRC~36.5HRC, it is corresponding
Brinell hardness (HBW 10/3000) acceptability limit be 325HBW~355HBW.
3. a kind of pre-detection method for 18Cr2Ni4WA steel processing fastener Brinell hardness according to claim 2,
It is characterized in that, step carries out the pre-detection method through the following experiment:
The inspection and calibration of the first step, Rockwell apparatus:
According to scleroscopic inspection and calibration method in GB/T 230.1-2009 " metal material Rockwell hardness test ", standard is taken
Rockwell hardness block 29.3HRC beats 2 points of Rockwell hardness, is averaged, and measurement average value should be with the standard value on calibrated bolck certificate
29.3HRC is differed within allowable error (± 1.5), and obtains correction value；If exceeding error range, commissioning device, directly
To equipment qualification, correction value is obtained；
Second step carries out Rockwell hardness detection:
Rockwell hardness HRC detection is carried out to 18Cr2Ni4WA steel processing fastener sample, be averaged, and to inspection result at 3 points
It is modified；
Third step judges whether 18Cr2Ni4WA steel processing fastener Brinell hardness (HBW 10/3000) is qualified and whether needs in advance
Want further progress 18Cr2Ni4WA steel processing fastener Brinell hardness (HBW 10/3000) detection:
18Cr2Ni4WA steel processing fastener sample is subjected to the correction value after Rockwell hardness HRC detection and compares Rockwell hardness HRC
Acceptability limit: 31.5HRC~36.5HRC is detected, if within acceptability limit, then detect Brinell hardness (HBW 10/
3000)；If not within acceptability limit, determine test result be it is unqualified, then need not detect Brinell hardness (HBW again
10/3000)。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116499913A (en) * | 2023-04-04 | 2023-07-28 | 兴化市新强龙不锈钢制品有限公司 | Stainless steel angle steel hardness detection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103558105A (en) * | 2013-10-22 | 2014-02-05 | 西安航空动力股份有限公司 | Determination method for Brinell hardness of titanium alloy |
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2019
- 2019-04-04 CN CN201910270021.8A patent/CN110082233A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558105A (en) * | 2013-10-22 | 2014-02-05 | 西安航空动力股份有限公司 | Determination method for Brinell hardness of titanium alloy |
Non-Patent Citations (1)
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| 赵梅等: ""布氏硬度试验中0.102F/第值选择方法"", 《物理测试》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116499913A (en) * | 2023-04-04 | 2023-07-28 | 兴化市新强龙不锈钢制品有限公司 | Stainless steel angle steel hardness detection device |
| CN116499913B (en) * | 2023-04-04 | 2023-09-15 | 兴化市新强龙不锈钢制品有限公司 | Stainless steel angle steel hardness detection device |
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