ASTM F Standard Test Method for Determining Decarburization and Carburization in Hardened and Tempered Threaded Steel Bolts. ASTM FM 淬火和回火的螺纹钢螺栓、螺钉和螺柱的脱碳和渗碳性测定的 标准试验方法(米制) – Designation: F M – 07 METRIC. Start. Standard ASTM standard · ASTM F Status: Withdrawn · Replaced by : ASTM F Fasteners; Rolling Element Bearings (ASTM VOL ).
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A number in parentheses indicates the year of last reapproval. A superscript epsilon asrm indicates an editorial change since the last revision or reapproval.
This test method is not intended to address products which are intentionally carburized to achieve speci? Either method is appropriate for routine examinations.
ASTM FM 淬火和回火的螺纹钢螺栓、螺钉和螺柱的脱碳和渗碳性测定的标准试验方法(米制)_百度文库
The Microindentation Method 2 shall be considered the referee method. No other units of measurement are included in this standard. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory f22328 prior to use.
Current edition approved Oct. Originally approved in Last previous edition approved in as F M — Too much of either will adversely affect the safety and asstm of the threaded product.
Therefore, limits have been established for four different product groups: Both methods are used for routine inspections when evaluations are conducted at a single location on the product sample. Because aatm evaluation at a speci? When either test method is performed, both conditions will be apparent and shall be reported.
For example, if an order wstm placed to test for decarburization and none is found but the presence of decarburization is detected, it shall be reported on the test adtm that carburization was found. Class of Decarburization 5. The dimensions for N and H are listed in Table 2 for each Class. Dimension G Table 1 and Fig. NOTE 1—Refer to the product standard for speci? When limits are not speci? The width of any light-etching band of martensite de?
ASTM F2328 – 17
Compare the image with Fig. The optical method is the only valid method for evaluating the depth of gross decarburization. Gross decarburization is prohibited in Class 3 and Class 4 products. If visible evidence of surface carburization is present on the surface zone, the microindentation hardness method, in accordance with Section 8, shall be used.
These coatings shall be removed prior to mounting if the coating prevents proper awtm. Care must also be exercised to not alter the surface condition of the substrate during the coating removal process. Evaluation by the Microindentation Hardness Method 8. This shall be performed in accordance with good metallographic practice. See Practice E 3. Evaluation by the Optical Method 7. Examine Vickers HV gf gf gfA gf gf gfA Lighter loads shall be used if the size of the part warrants.
Guide N 12 G max 0.
H For heat treated products which have tensile strengths up to MPa and those with a speci? See Table 2 and Fig. The long axis of the Knoop indenter shall be aligned approximately parallel with the thread pitch angle at Position 3. Thread Pitch, P mm 0. Class 2 Hex Head, N min 0. Class 3 Hex Head, N min 0.
Class 4 Skt Head N min Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
If you f23288 that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. If a nonconformance is indicated, proceed to referee test method in 8. Determine the condition of the specimen by subtracting the average reading noted at Position 2 from the average reading noted at F3228 1, in accordance with 8.
Determine the condition of the specimen by subtracting the average reading noted at Position 1 from the average reading noted at Position 3, f3228 de? Asm threaded section will give evidence of carburization if the average of the four readings indicates a positive value. Precision and Bias 9.
When such data is available, a precision and bias section will be added.