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Reference Standard GB 1348-88 GB 1348-88 GB 1348-89 Chemical Composition(%) C:3.60-3.80 C:3.40-3.90 C:3.50-3.60 C:60-3.80 Mn:0.2-0.5 Mn:≤o.5 Si:2.50-2.90 Si:2.70-3.00 Si:3.0-3.2 P:≤0.08 P:≤0.07 P:≤0...