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鍛 件 EZB1182-2002 鍛鋼件檢驗通用規(guī)則 普通碳素結(jié)構(gòu)鋼(低合金鋼)成品化學(xué)成分允許偏差 規(guī)定化學(xué)成分 截面積 cm2 元素 范圍 % ≤650 >650~1300 >1300~2600>2600~5200 C (+0.021)( 0.03) 2) ) ±0.04 ±0.04 ±0.04 ±0.05 -0.02 Mn ≤0.08 (+0.05.-0.03) ±0.05 ±0.05 ±0.06 >0.08 (+0.10,-0.08) ±0.10 ±0.11 ±0.12 Si ≤0.35 ±0.03 ±0.03 ±0.04 ±0.04 >0.35 ±0.05 ±0.05 ±0.06 ±0.07 S ≤0.050 (+0.005) (+0.005) (+0.005) (+0.005) P ≤0.050 (+0.005) (+0.005) (+0.008) (+0.
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Designation: A 290 –02 An American National Standard Standard Speci?cation for Carbon and Alloy Steel Forgings for Rings for Reduction Gears 1 This standard is issued under the ?xed designation A 290; the number immediately following the designation indicates the year of original adoption or, in the caseof revision, the year of last revision. A number in parenthesesindicates the year of last reapp
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