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 美標H型鋼的正火：

正火后工件比退火狀態(tài)具有更好的綜合力學性能，對于一些受力不大、性能要求不高的普通結(jié)構零件可將正火作為最終熱處理，以減少工序、節(jié)約能源、提高生產(chǎn)效率。此外，對某些大型的或形狀較復雜的零件，當淬火有開裂的危險時，正火往往可以代替淬火、回火處理，作為最終熱處理。

美標H型鋼出廠檢驗方式：

質(zhì)量等級 拉伸試驗a,b 沖擊試驗c 下屈服強度ReL/MPa 抗拉強度Rm/MPa 斷后伸長率A/% 溫度 沖擊吸收能量KV2/J 不小于 不小于 Q550q CDE 550 530 - 660

注：a 當屈服不明顯時，可測量Rp0.2代替下屈服強度。b 拉伸試驗取橫向試樣。C 沖擊式樣去縱向試樣。G250、G300、G350工藝性能180彎曲試驗 厚度≤16mm 厚度＞16mm 彎曲結(jié)果D=2a D=3a 在試樣外表面不應有肉眼可見的裂紋注：D--彎曲壓頭直徑，a--試樣厚度。     
       美標H型鋼規(guī)格型號表（包含材料材質(zhì)）：

           名稱          型號             規(guī)格                   材質(zhì)
       美標H型鋼w4xw4x13 106x103x7.1 A992/A36/A572Gr50

  美標H型鋼w5xw5x16 127x127x6.1 A992/A36/A572Gr50

  美標H型鋼w5xw5x19 131x128x6.9 A992/A36/A572Gr50

  美標H型鋼w6x w6x8.5 148x100x4.3 A992/A36/A572Gr50

  美標H型鋼w6x w6x9 150x100x4.3 A992/A36/A572Gr50

  美標H型鋼w6x w6x12 153x102x5.8 A992/A36/A572Gr50

  美標H型鋼w6xw6x16 160x102x6.6 A992/A36/A572Gr50

  美標H型鋼w6xw6x20 157x153x6.6 A992/A36/A572Gr50

  美標H型鋼w6xw6x25 162x154x8.1 A992/A36/A572Gr50

  美標H型鋼w8xw8x10 200x100x4.3 A992/A36/A572Gr50

  美標H型鋼w8xw8x13 203x102x5.8 A992/A36/A572Gr50

  美標H型鋼w8xw8x15 206x102x6.2 A992/A36/A572Gr50

  美標H型鋼w8x w8x14 203x134x5.0 A992/A36/A572Gr50

  美標H型鋼w8xw8x21 210x134x6.4 A992/A36/A572Gr50

  美標H型鋼w8xw8x24 201x165x6.2 A992/A36/A572Gr50

  美標H型鋼w8xw8x28 205x166x7.2 A992/A36/A572Gr50

  美標H型鋼w8xw8x31 203x203x7.2 A992/A36/A572Gr50

  美標H型鋼w8xw8x35 206x204x7.9 A992/A36/A572Gr50

  美標H型鋼w8xw8x48 216x206x10.2 A992/A36/A572Gr50

  美標H型鋼w8xw8x58 222x209x13 A992/A36/A572Gr50

  美標H型鋼w8xw8x67 229x210x14.5 A992/A36/A572Gr50

  美標H型鋼w10x4x12 251x101x4.8 A992/A36/A572Gr50

  美標H型鋼w10x4x15 254x102x5.8 A992/A36/A572Gr50

  美標H型鋼w10x4x17 257x102x6.1 A992/A36/A572Gr50

  美標H型鋼w10x4x19 260x102x6.4 A992/A36/A572Gr50

  美標H型鋼w10x5.75x22 258x146x6.1 A992/A36/A572Gr50

  美標H型鋼w10x5.75x26 262x147x6.6 A992/A36/A572Gr50

  美標H型鋼w10x5.75x30 266x148x7.6 A992/A36/A572Gr50

  美標H型鋼w10x8x33 247x202x7.4 A992/A36/A572Gr50

  美標H型鋼w10x8x39 252x203x8.0 A992/A36/A572Gr50

  美標H型鋼w10x8x45 257x204x8.9 A992/A36/A572Gr50

  美標H型鋼w10x10x49 253x254x8.6 A992/A36/A572Gr50

  美標H型鋼w10x10x54 256x255x9.4 A992/A36/A572Gr50

  美標H型鋼w10x10x60 260x256x10.7 A992/A36/A572Gr50

  美標H型鋼w10x10x68 264x257x11.9 A992/A36/A572Gr50

  美標H型鋼w10x70x77 269x259x13.5 A992/A36/A572Gr50

  美標H型鋼w10x10x88 275x261x15.4 A992/A36/A572Gr50

  美標H型鋼w10x10x100 282x263x17.3 A992/A36/A572Gr50

  美標H型鋼w10x1x112 289x265x19.2 A992/A36/A572Gr50