142Chemical Compositions

The chemical compositions for HPS50W (HPS345W) and HPS70W (HPS485W) are given in Table 14.1. For purpose of comparison, the chemical compositions of a conventional high-strength steel commonly used for bridge construction, A709-70W (A709-485W), are also given.

It can be seen from Table 14.1 that the carbon level is much lower for HPS, thus enhancing weldability and toughness. There is also a noticeable decrease in the amount of phosphorus, sulfur, and nickel, but with the addition of molybdenum, aluminum, and nitrogen.

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