煉鋼產(chǎn)品知識與質(zhì)

1、分 類 方 法名 稱區(qū) 分 要 素舉例說明化學(xué)成分分類碳素鋼工業(yè)純鐵C0.04%低碳鋼C0.050.25%螺紋鋼、角鋼、普圓中碳鋼C0.260.60%45#、50CrVA高碳鋼C0.61%60Si2Mn合金鋼低合金鋼合金元素5%南鋼全部中合金鋼合金元素510%高合金鋼合金元素10%不銹鋼品質(zhì)分類普通鋼P0.045%，S0.050%螺紋鋼、角鋼、普圓優(yōu)質(zhì)鋼P0.035%，S0.035%優(yōu)圓、彈扁高級優(yōu)質(zhì)鋼P0.030%，S0.030%部分出口彈扁冶煉方法爐別平爐鋼/電爐鋼轉(zhuǎn)爐鋼脫氧程度沸騰鋼半鎮(zhèn)靜鋼鎮(zhèn)靜鋼南鋼全部公稱直徑，mm實際重量與理論重量的偏差，%61271420522504牌號化學(xué)成分，

2、%CMnSiPSCeqHRB3350.251.600.800.0450.0450.52HRB4000.251.600.800.0450.0450.54HRB5000.251.600.800.0450.0450.55牌號公稱直徑mms（或p0.2）MPabMPa5%不小于HRB335625285033549016HRB400625285040057014HRB500625285050063012序號統(tǒng)一數(shù)字代號牌號化學(xué)成分，%CSiMnCrNiCu不大于110U20352350.32-0.390.17-0.370.50-0.800.250.300.2512U20452450.42-0.500.1

3、7-0.370.50-0.800.250.300.2513U20502500.47-0.550.17-0.370.50-0.800.250.300.2527U2145245Mn0.42-0.500.17-0.370.70-1.000.250.300.2531組別PS不大于，%優(yōu)質(zhì)鋼0.0350.035高級優(yōu)質(zhì)鋼0.0300.030特級優(yōu)質(zhì)鋼0.0250.020755SiMnVB0.52-0.600.70-1.001.00-1.300.350.08-0.160.0005-0.00350.350.250.0350.035860Si2Mn0.56-0.641.50-2.000.60-0.900.35

4、0.350.250.0350.035960Si2MnA0.56-0.641.60-2.000.60-0.900.350.350.250.0300.0301255CrMnA0.52-0.600.17-0.370.65-0.950.65-0.950.350.250.0300.0301550CrVA0.46-0.540.17-0.370.50-0.800.80-1.100.10-0.200.350.250.0300.030SUP90.52-0.600.15-0.350.65-0.950.65-0.950.350.250.0350.035序號牌號物理性能ReLMPaRmMPaA%Z%硬度HBW脫碳層低倍表面質(zhì)量755SiMnVB11751275525321不大于厚度的1.5-3.0%不得有縮孔、裂紋、分層、白點、氣泡、翻皮及夾雜。一般疏松、中心疏松及偏析不超過2.5級鋼材表面不得有裂紋、折疊、結(jié)疤、夾雜、分層、壓入的氧化鐵皮860Si2Mn12251370530321960Si2MnA1370157