requirements of the specification;otherwise all remaining
material in the heat or lot (Note 1)shall be rejected or,at the
option of the producer,each length of flat-rolled stock or tube
may be individually tested for acceptance.Lengths of flat-
rolled stock or tubes which do not meet the requirements of the
specification shall be rejected.
N OTE 1—A lot consists of 250tubes.
editorial hand9.Hardness Requirements
9.1The tubes shall have a hardness number not exceeding
72HRB.
10.Mechanical Tests Required
10.1Flattening Test —One flattening test shall be made on
specimens from each of two tubes from each lot (Note 1)or
fraction thereof.
10.2Flange Test —One flange test shall be made on speci-
mens from each of two tubes from each lot (Note 1)or fraction
thereof.
10.3Reverse Flattening Test —One reverse flattening test
shall be made on a specimen from each 1500ft [450m]of
finished tubing.
10.4Hardness Test —Brinell or Rockwell hardness tests
shall be made on specimens from two tubes from each lot.The
term lot applies to all tubes prior to cutting,of the same
nominal diameter and wall thickness which are produced from
the same heat of steel.When final heat treatment is in a
batch-type furnace,a lot shall include only those tubes of the same size and the same heat which are heat treated in the same furnace charge.When final heat treatment is in a continuous furnace,a lot shall include all tubes of the same size and heat,heat treated in the same furnace at the same temperature,time at heat,and furnace speed.10.5Hydrostatic or Nondestructive Electric Test —Each tube shall be subjected to either the hydrostatic or the nonde-structive electric test.The purchaser may specify which test is to be used.11.Surface Condition 11.1The finished tubes shall be free of scale.A sli
ght amount of oxidation shall not be considered as scale.12.Product Marking 12.1In addition to the marking prescribed in Specification A 450/A 450M,the letters “ERW”shall be legibly stenciled on each tube,or marked on a tag attached to the bundle or box in which the tubes are shipped.12.2The manufacturer’s name or symbol may be placed permanently on each tube by rolling or light stamping before normalizing.If a single stamp is placed on the tube by hand,this mark should not be less than 8in.[200mm]from one end of the tube.12.3Bar Coding —In addition to the requirements in 12.1and 12.2bar coding is acceptable as a supplemental identifi-cation method.The purchaser may specify in the order a specific bar coding system to be used.
The American Society for Testing and Materials takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.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 five years and if not revised,either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters.Your comments will receive careful consideration at a meeting of the responsible technic
al committee,which you may attend.If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards,100Barr Harbor Drive,West Conshohocken,PA
19428.

版权声明：本站内容均来自互联网，仅供演示用，请勿用于商业和其他非法用途。如果侵犯了您的权益请与我们联系QQ:729038198，我们将在24小时内删除。