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Chemical composition of cast steels used in common welded structures 2012-2-24 Source: Author: Anonymous Chemical composition of cast steels used in common welded structures Standards Grades C Mn Si P S Residual elements Carbon equivalent Ni Cr Cu Mo V Total International standard (ISO3755-1991) 200~400W 0.25 1.00 0.60 0.035 0.035 0.40 0.35 0.40 0.15 0.05 1.0 230~450W 0.25 1.20 0.60 0.035 0.035 0.40 0.35 0.40 0.15 0.05 1.0 270~480W 0.25 1.20 0.60 0.035 0.035 0.40 0.35 0.40 0.15 0.05 1.0 340~550W 0.25 1.50 0.60 0.035 0.035 0.40 0.35 0.40 0.15 0.05 1.0 Chinese standard (GB/T7659-1987) ZG200~400H 0.20 0.80 0.50 0.04 0.04 0.30 0.30 0.30 0.15 0.05 0.8 0.38 ZG230~450H 0.22 1.20 0.50 0.04 0.04 0.30 0.30 0.30 0.15 0.05 0.8 0.43 ZG270~485H 0.25 1.20 0.50 0.04 0.04 0.30 0.30 0.30 0.15 0.05 0.8 0.45 Japanese standard (JISG5102-1991) SCW410 0.22 1.50 0.80 0.04 0.04 0.40 SCW450 0.22 1.50 0.80 0.04 0.04 0.43 SCW480 0.22 1.50 0.80 0.04 0.04 0.50 0.50 0.45 SCW550 0.22 1.50 0.80 0.04 0.04 2.50 0.50 0.30 0.20 0.48 SCW620 0.22 1.50 0.80 0.04 0.04 2.50 0.50 0.30 0.20 0.50 American standard (ASTMA216-1998) WCA 0.25 0.70 0.60 0.04 0.045 0.50 0.40 0.50 0.25 0.03 1.0 0.50 WCB 0.30 1.00 0.60 0.04 0.045 0.50 0.40 0.50 0.25 0.03 1.0 0.50 WCC 0.25 1.20 0.60 0.04 0.045 0.50 0.40 0.50 0.25 0.03 1.0 0.55 Website cited in this article: http://www.12cr1mov.org Steel grades① C Si Mn P ≤ S ≤ Cr Ni Mo Others SCW410 (SCW42) ≤0.22 ≤0.80 ≤1.50 0.040 0.040 — — — CE≤0.40② SCW450 (SCW46) ≤0.22 ≤0.80 ≤1.50 0.040 0.040 — — — CE≤0.43② SCW480 (SCW49) ≤0.22 ≤0.80 ≤1.50 0.040 0.040 ≤0.50 ≤0.50 — CE≤0.45 SCW550 (SCW56) ≤0.22 ≤0.80 ≤1.50 0.040 0.040 ≤0.50 ≤2.50 ≤0.30 V≤0.20 CE≤0.48② SCW620 (SCW63) ≤0.22 ≤0.80 ≤1.50 0.040 0.040 ≤0.50 ≤2.50 ≤0.30 V≤0.20 CE≤0.50② ① The values in parentheses are old steel grade designations. ② Carbon equivalent %: CE = C + Mn/6 + Si/24 + Ni/40 + Cr/5 + Mo/4 + V/14. b. The mechanical properties of cast steel for welded structures are shown in Table 5-85. Table 5-85 Mechanical properties of cast steel for welded structures. Steel grade, Mechanical properties (minimum values): Impact absorption energy ① Akv (0°C) ≥ /J, σb /MPa, σs ② /MPa, δ(%) SCW410: 410, 235, 21, 27; SCW450: 450, 255, 20, 27; SCW480: 480, 275, 20, 27; SCW550: 550, 355, 18, 27; SCW620: 620, 430, 17, 27. ① Average value of the three test specimens ； Experimental temperature: 0°C.