umgangatho wombhobho we-ERW umi ngolu hlobo lulandelayo: API 5L, ASTM A53 B, ASTM A178, ASTM A500/501, ASTM A691, ASTM A252, ASTM A672 API 5L Standard ijolise kwigesi namanzi kushishino lweoyile negesi yereferensi, esetyenziselwa ireferensi. umbhobho wentsimbi ongenamthungo kunye nombhobho wentsimbi odityanisiweyo, kubandakanywa izibuko eziqhelekileyo kunye nezibuko, izibuko zesokethi yombhobho...
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