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What is Grade 70 Transport Chain
What is Grade 70 Transport Chain?
The base steel for making grade 70 chains shall meet the following criteria: Carbon, 0.35% max; Phosphorous 0.040% max; and Sulfur, 0.050% max. And the chain shall be made by electric welding or gas welding process. The manufacturing methods are chain manufacturers' choice such that the chain complies with the requirements of grade 70 transport chains, see this specification table for detail.
Elongation must not be less than 15% for grade 70 transport chains.
Grade 70 chains shall have periodic embossing for identification purpose, 5/16'' and 3/8'' Grade 70 chains shall be embossed at interval no greater than 1ft. or 0.3m, all other Grade 70 chains shall be embossed at intervals no greater than 3ft. or 0.9m. Grade 70 chains shall be embossed at least with 7, 70 or 700. All chain identification markings must be embossed using raised characters. Chain links must not be marked with indented characters.