ASME B107.47M:1998 pdf download METAL CHISELS: SAFETYREOUIREMENT8
4.1.3 Handles may be of any design and shall beinserted securely into the chisel and shall permit thechisel to be held over the work without exposing theuser to personal injury.Handles shall withstand thetest specified in para. 4.4.4.
4.1.4 All chisels and handles shall be free of nonfunc-
tional sharp edges,points，and surface roughness thatcould inflict personal injury to the user when handlingthe tool.
4.2 Materials
4.2.1 Chisels shall be made from special-quality,fine grain，hot-rolled or cold-finished carbon or alloysteel， or from an equivalent material, having good wear-resisting and shock-resisting qualities and conformingto any of the following standards: ASTM A 29/A 29M.ASTM A 322,ASTM A 331,ASTM A 576,or ASTMA 681.
4.2.2 Chisels shall be free of manufacturing andmaterial defects such as seams,laps,pipes，and coldshuts that would jeopardize sound construction. Chiselsshall conform to the requirements for mechanical proper-ties specified in para.4.3,and shall withstand the testsspecified in paras.4.4.2 and 4.4.3.
4.2.3 Handles shall be of any suitable material thatwill withstand the test requirements in para.4.4.4.
4.3 Mechanical properties
4.3.1 Chisels shall be hardened and tempered to notless than 53HRC or equivalent nor more than 60HRCor equivalent for a distance of not less than 0.25 in.(6.4 mm) from the cutting edge.
4.3.2 The hardness of the struck face of the chiselshall not exceed 4SHRC or equivalent.
4.4 Tests
Many tests required herein are inherently hazardous,and adequate safeguards for personnel and propertyshall be employed in conducting such tests.
4.4.1 General.Metal chisels shall be capable ofmeeting tests specified in paras.4.4.2 through 4.4.4.Separate (new) chisels shall be used for each of thetests.Failure to meet the requirements of any one of the tests indicates the chisels are not in compliancewith this Standard.
4.4.2 Hardness Determination Test. Hardnessdetermination with respect to cutting edges and struckfaces shall be made on a fixtured tool or on a suitablemounted or unmounted specimen that has been cutfrom the tool using the wet abrasive or other equivalentmethod. Any hardness test will be. acceptable thatutilizes equipment and methods equivalent to Rockwellhardness determination as specified in ASTM E I8.4.4.3 lmpact Test.Tests conducted in accordancewith paras.4.4.3.1 through 4.4.3.3 shall result in nochipping or spalling of the cutting edge or struck face.The chisel body and taper shall not cxhibit cracking orbending. Normal deformation at either end is permitted.’The chisel shall be mounted vertically with the cuttingedge centered on a steel bar and oriented 90 deg tothe bar’s longitudinal axis.The steel bar shalI rest ona rigidly supported steel block weighing not less than200lb (91 kg) with a minimum hardness of 35HRCor equivalent.The specified weight shall have a strikingface hardness of 45HRC or equivalent to 60HRC orequivalent and shall be dropped squarely onto thechisel’s struck face.The weight’s striking face diametershall not be less than 0.375 in. (9.53 mm)larger thanthe struck face of the chisel. The steel bar shall bemoved after each drop of the weight to make a newimpression.Typically the weight is cylindrical and isdropped through a seamless tube slightly larger thanthe diameter of the weight.
4.4.3.1 Test for Cape,Cold. and ConcaveSplitting Chisels.The steel bar shall be a rod witha diameter of 0.25 in.(6.4 mm) made of AISI o12steel uniformly hardened to 33HRC to 35HRC orequivalent.
Aweight of 10 lb(4.5 kg) shall be dropped 20times from the height indicated below:
ASME B107.47M:1998 pdf download
