Issues regarding the supply condition of composite steel plates
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The requirements specified in the institute’s logo, which is used in the design of composite steel plate towers by one of Sinopec Group’s design institutes, state that: “Composite steel plates shall be delivered in the normalized state.” While ensuring the various mechanical properties at the base layer and the corrosion resistance of the composite layer, the specific heat treatment process is determined by the composite steel plate manufacturer. “The delivery condition for composite steel plates as specified in NB/T 47002.1-2009 is as follows: \"Composite plates shall be delivered after heat treatment, leveling, and shearing (or cutting). The heat treatment condition of the composite plates shall comply with the requirements specified in GB150 or JB4732 for the respective base materials.\" In the past, when ordering materials for our company, we only required that the base materials of type Q245R or Q345R be supplied in a normalized state, as specified in the drawings; there were no requirements regarding the state of the materials after compounding, and no solid evidence to support such requirements either. It’s not mentioned either in 150.
This post was last edited by xlxuiin on 2016-12-6 at 14:58. HGT 20581-2011 – Specifications for the Selection of Materials for Steel Chemical Storage Vessels, 6.2.2(4): Stainless steel clad plates shall be supplied after heat treatment. This is consistent with NB47002. Be more specific regarding the requirements for the institute’s logo – normalizing is also one of the heat treatment processes.
When designing equipment, if the equipment specifications require it to be supplied in the normalized state, then it is supplied in that state. Just understand this: prioritize strength first, and corrosion resistance second.