ASTM F541-12(R2020) pdf free download

ASTM F541-12(R2020) pdf free download.Standard Specification for Alloy Steel Eyebolts
6. Metallurgical Requirements
6.1 Grain Size: 6.1.1 Requirements—The finished eyebolts shall have an apparent heat-treated grain size ofTest Methods E112 No. 5 or finer. 6.1.2 Specimen—Grain size shall be rated on specimens taken from the eyebolt after final heat treatment. 6.1.3 Test Method—Grain size on the finished eyebolt shall be determined in accordance with Test Methods E112. 6.2 Macroetch Test: 6.2.1 Requirement—When ground and etched, the cross section of the eyebolt shall be free of injurious surface seams, internal cracks, pipe, segregation, and other imperfections detrimental to the intended application. 6.2.2 Specimen—Macroetch test specimens shall consist of the full transverse cross section of a finished eyebolt shank. 6.2.3 Test Method—Macroetch tests shall be performed in accordance with Test Method E340. 6.3 Decarburization: 6.3.1 Requirement—The depth of decarburization (total + partial), as measured on the eyebolts after heat treatment, shall not exceed the requirements in Table 2. 6.3.2 Specimen—The test specimens shall consist of the unmachined surface of the heat-treated eyebolts in an area where threads would normally be machined. 6.3.3 Test Method—The depth of decarburization shall be determined by metallographic etching. The edge of the speci- men shall be suitably prepared to preserve the original surface and the sample shall then be polished for metallographic examination. The section shall be etched in 4 % nital and the samples examined under a microscope at 100× using an eyepiece graduated in 0.001-in. (0.025-mm) increments. The measured depth of any light etched band shall be taken as the decarburization depth. 6.3.4 When the metallographic etch method of 6.3.3 for decarburization renders results that are inconclusive, then the microhardness traverse method of Specification A574 shall be employed. The depth of decarburization shall be denoted by that radial depth where the hardness decrease is more than the equivalent of 3 points HRA, when compared to the average microhardness of undecarburized locations beyond this site. The average microhardness of undecarburized locations of the eyebolt shall be determined for depths not exceeding 25 % of its shank diameter.
7. Mechanical Properties
7.1 Hardness: 7.1.1 Requirements—The eyebolts shall have a Brinell Hardness of 197 to 248 (equivalent Rockwell B93 to 101). Hardness tests are subject to confirmation by tensile tests. 7.1.1.1 In case of controversy, acceptance based on tensile requirements shall take precedence over low readings of hardness tests. 7.1.2 Specimens—For routine inspection, hardness tests shall be made on a properly prepared surface of the finished eyebolt. For referee purposes tests shall be made on a trans- verse section through the threads one diameter from the end. 7.1.3 Test Method—Hardness tests shall be made in accor- dance with Test Methods E10 or E18, as applicable. 7.2 Tensile Strength: 7.2.1 Requirement—Test specimens machined from finished eyebolts shall conform to the tensile properties specified in Table 3. 7.2.2 Specimens—Eyebolts for tensile tests shall be selected from the eyebolts subjected to the hardness test to represent the high and low end of the hardness test results. The specimens shall be machined from the finished eyebolts whenever pos- sible. When the eyebolts are too small to remove machined specimens, they shall be taken from test coupons from the same heat of steel, subjected to the same reduction, and heat treated with the eyebolts represented. 7.2.3 Test Methods—Tension tests shall be made in accor- dance with Test Methods F606/F606M. 7.3 Breaking Strength: 7.3.1 Requirements—The eyebolt shall conform to the breaking strength specified in Table 4. 7.3.2 Specimens—Eyebolts for breaking strength tests shall be selected from the eyebolts subjected to the hardness test to represent the high and low end of the hardness test results. The eyebolts shall be tested full size. 7.3.3 Test Methods—The breaking strength shall be deter- mined by exerting an in-line pull upon the eyebolt which has had its threaded shank screwed into a block and secured in one jaw of the testing machine. The eye shall be loaded by a round section no greater than 50 % ofeye diameter and secured in the other jaw of the testing machine.