The Grade 70 transport chain, or Grade 70 binder chain, is a high quality, high strength carbon steel chain, heat treated, used for cargo control, tie down application, not for overhead lifting. The base steel for making grade 70 chains meets the following criteria: Carbon, 0.35% max; Phosphorous 0.040% max; and Sulfur, 0.050% max.
And the chain is made by electric welding or gas welding process. Our grade 70 transport chains are made to the specification of NACM96 standard.
The elongation is no less than 15% for grade 70 transport chains. Grade 70 chains have periodic embossing for identification purpose, 5/16'' and 3/8'' Grade 70 chains are embossed at interval no greater than 1ft. or 0.3m, all other Grade 70 chains are embossed at intervals no greater than 3ft. or 0.9m. Grade 70 chains are embossed with 7, 70 or 700. All chain identification markings are embossed using raised characters. Chain links are not marked with indented characters for the safety reason.
All of our ASTM80 grade 70 short link chains have the same minimum breaking strength as NACM96 grade 70 transport chain, only their chain link are shorter than NACM96 chains, therefore these short link chains are used in some applications which need the chains to be more flexible.
