Common valve materials commonly used austenitic - ferritic duplex stainless steel castings, forgings material chemical composition status | Grade | Chemical composition /% (except for the range given for the maximum) | Reference Standard | C | Mn | Si | p | S | Cr | Ni | Mo | Cu | W | N | casting | IB (CD4MCuN) | 0.04 | 1.00 | 1.00 | 0.04 | 0.04 | 24.5-26.5 | 4.7-6.0 | 1.7-2.3 | 2.7-3.3 | Â | 0.10-0.25 | ASTM A 995 ASTM A 890 | 4A (CD3MN) | 0.03 | 1.50 | 1.00 | 0.04 | 0.02 | 21.0-23.5 | 4.5-6.5 | 2.5-3.5 | 1.00 | Â | 0.10-0.30 | 5A (CE3MN) | 0.03 | 1.50 | 1.00 | 0.04 | 0.04 | 24.0-26.0 | 6.0-8.0 | 4.0-5.0 | Â | Â | 0.10-0.30 | 6A (CD3MWCuN) | 0.03 | 1.00 | 1.00 | 0.030 | 0.025 | 24.0-26.0 | 6.5-8.5 | 3.0-4.0 | 0.5-1.0 | 0.5-1.0 | 0.20-0.30 | Forgings | F 51 | 0.03 | 2.00 | 1.00 | 0.030 | 0.020 | 21.0-23.0 | 4.5-6.5 | 2.5-3.5 | Â | Â | 0.08-0.20 | ASTM A 182 | F 53 | 0.03 | 1.20 | 0.80 | 0.035 | 0.020 | 24.0-26.0 | 6.0-8.0 | 3.0-5.0 | 0.5 | Â | 0.24-0.32 | F 55 | 0.03 | 1.00 | 1.00 | 0.030 | 0.010 | 24.0-26.0 | 6.0-8.0 | 3.0-4.0 | 0.5-1.0 | 0.5-1.0 | 0.20-0.30 |
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