Grades 345W [50W], 345CR [50CR], HPS 345W [HPS 50W], HPS 485W [HPS 70W], and HPS 690W [HPS 100W] have enhanced atmospheric corrosion resistance (Section 13.1.2). Product availability is shown in Table 2.
ASTM-A709/A709M, 2016 - MADCADHPS 70W [HPS 485W] 70  HPS 100W [HPS 690W] 100  1.1.1 Grades 36 , 50 , 50S [345S], and 50W [345W] are also included in Specifications A36/A36M, A572/A572M, A992/A992M, and A588/A588M, respectively. When the requirements of Table 9 or Table 10 or the supplementary requirements of this specification are specified
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Fabrication guide Fracture Mechanics FractureNew York State Thruway bridge fabricated with A709 Grade HPS 70W weathering steel. Corrosion and weathering performance. Thickness Loss (Micrometers) Figure 2-8:Atmospheric corrosion of plate steel in typical industrial environment. 250 200. Carbon Steel + 0.021% Cu. 150. Carbon Steel + 0.21% Cu. 100. A588 A242. 50 0. 10. 15. 20. Time of
HPS 70W [HPS 485W] 70  100  100  100W [690W] 100  1.1.1 Grades 36 , 50 , 50S [345W], 100 , and 100W [690W] are also included in Specifications A 36/A 36M, A 572/A 572M, A 992/A 992M, A 588/A 588M, and A 514/A 514M, respectively. When the supplementary requirements of this specification are specified, they