比Q235更贵的钢,已知45号钢,锅炉钢20g答:20R,16MnR,15MnVR 15CrMoR, 13MnNiMoNbR 15MnNbR,15MnVNR 16MnDR,09MnNiDR, 15MnNiDR 12Cr2MoR, 14Cr1MoR 07MnCrMoVR,07MnNiCrMoVDR SB410, SB450, SB480 SPV235, SPV315, SPV355.SPV410, SPV450, SPV490 SGV410, SGV450,SGV480 SBV1A, SBV1B, SBV2, SBV3 SEV245, SEV295, SEV345 Hl,...