what does the 70 in the aws code er70s-6 represent_what does the 70 in the aws code er70s-6 represent

Our factory can also produce according to the customer ' s requirement, the products widely applies in the national stadium construction , bridges building, ship - building, petrochemical industry, machinery manufacturing, oil and water transportation project, and all kind of engineering. And civilian use is very extensive. Our products have been widely accept by the market , even , many countries used the products to get the large bidding project.
We continuously improve product quality for international economy synchronous development.
We will do the best quality products , excellent service to cooperate with friends of all circles both at home and abroad.