Galvanize It! Online Seminar

Energy & Impact Assessment

Each of the three products studied: hot-rolled structural sections, plate, and hollow structural sections (HSS), used the same data for A2, A3, and D – as the raw material and energy input and emission outputs are virtually identical. However, the A1 data does change for each product, based on the steel making and fabrication requirements. 

 Structural Sections
(A1-A3 Total)
Plate
(A1-A3 Total)
HSS
(A1-A3 Total)
Recycle Credit
(D)
Renewable Primary Energy1,010 MJ991 MJ1,230 MJ-60.3 MJ
Non-Renewable Energy18,700 MJ22,200 MJ31,200 MJ-162 MJ
Total Energy19,700 MJ23,200 MJ32,400 MJ-222 MJ
Use of Secondary Materials (mt)1.02 mt0.81 mt0.07 mt0 mt
Radioactie Waste0.00876 mt0.000804 mt0.000579 mt-0.0000147 mt
Materials for Recycling0.0205 mt0.0205 mt0.0205 mt0 mt
GWP (CO2)1.48 kg1.79 kg2.68 kg-0.0156 kg
AP (SO2)0.00728 kg0.00728 kg0.0100 kg-0.000117 kg
EP (N)0.000216 kg0.00029 kg0.000509 kg-0.00000702 kg
POCP (O3)0.0586 kg0.0892 kg0.143 kg-0.00266 kg
ADPf 16,500 MJ20,000 MJ29,600 MJ-125 MJ

Looking at all three products input and output flows using the US EPA’s TRACI 2.1 methodology, the EPD shows the overall impact of the galvanizing process is minimal in comparison to the raw materials supply. In each of the three products, the hot-dip galvanized coating application accounts for no more than 15% of the total energy or impact, and in the case of HSS, the HDG is no more than 10%. To view the full EPD, please visit galvanizeit.org/epd.

HDG Hot-Rolled Structural
HDG Plate
HDG Hollow Structural Sections (HSS)