保證淬透性結(jié)構(gòu)鋼(GB/T5216-1985)
保證淬透性結(jié)構(gòu)鋼(GB/T5216-1985)(1)牌號和化學成分見表1。表1 保證淬透性結(jié)構(gòu)鋼的牌號和化學成分牌號化學成分(質(zhì)量分數(shù))(%)CMnCr其他45HO.42~0.5020CrH0.17~O.230.70~1.1040CrHO.37~O.4445CrHO.42~0.4940MnBH0.37~0.441.00~1.40B0.0005~0.003545MnBHO.42~O.49B0.0005~O.003520MnMOBH0.16~0.22O.90~1.25B0.0005~0.0035Mo0.20~O.3020MnVBHO.17~O.231.05~1.45BO.0005~O.0035V0.07~0.1222MnVBHO.19~0.251.25~1.65B0.0005~O.0035V0.07~O.1220MnTiBH0.17~0.231.20~1.55B0.0005~O.0035TiO.04~0.1020CrMnMoH0.17~0.230.85~1.201.05~1.40Mo0.20~O.3020CrMnTiHO.17~O.230-80~1.151.00~1.35TiO.04~O.1020CrNi3H0.17~0.23O.30~O.65O.60~O.95Ni2.70~3.2512Cr2Ni4HO.10~0.17O.30~O.651.20~1.75Ni3.20~3.7520CrNiMOH0.17~0.230.60~0.95O.35~O.65Ni0.35~O.75M00.15~O.25注:1.各牌號的含硅量(質(zhì)量分數(shù))均為0.17%~O.37%?! ?.鋼的硫、磷、銅、鉻、鎳殘余元素的含量(質(zhì)量分數(shù))應不大于(%):名稱PSCuCrNi優(yōu)質(zhì)碳素結(jié)構(gòu)O.040O.040O.250.25O.25優(yōu)質(zhì)合金結(jié)構(gòu)鋼O.035O.035O.300.35O.30高級優(yōu)質(zhì)合金結(jié)構(gòu)鋼O.0300.030O.250.35O.30 3.熱壓力加工用鋼的銅含量(質(zhì)量分數(shù))應不大于O.20%。(2)力學性能見表2、表3表2 退火或高溫回火狀態(tài)鋼材的硬度牌號壓痕直徑DHB/mm≧布氏硬度HBS≤45H4.319720CrH4.517940CrH4.220745CrH4.121740MnBH4.220745MnBH4.121720MnVBH4.220720MnⅦH4.220722MnVBH4.220720MnTiBH4.418720CrMnMOH4.121720CrMnTiH4.121720CrN3H3.924112Cr2Ni4H3.726920CrNiMOH4.3197表3  含硼鋼鋼材的熱處理制度及沖擊吸收功牌號試樣毛坯尺寸/mm正火淬火回火沖擊韌度ak/(J/cm2)≥溫度/℃冷卻劑溫度/℃冷卻劑溫度/℃冷卻劑40MnBH25880~900空氣850±20油510±30水6945MnBH5920MnMoBH15930~950880±1O200±20空氣或水6920MnVBH860±20200±1O22MnVBH200±2020MnTiBH(3)用途用于機械加工零件。參見相同牌號的優(yōu)質(zhì)碳素結(jié)構(gòu)鋼和合金結(jié)構(gòu)鋼。
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