1、SA387按所含的合金元素分为如下几个等级:级别公称含铬量,%公称含钼量,%20.500.50121.000.50111.250.502 2,22L2.251.0021,21L3.001.0055.000.5099.001.00919.001.001.1除21L、2 2L和91级外,每个级别的钢板按其热处理不同而有如拉伸性能表所示的两个抗拉强度类别。在退货状态下这些级别的钢板仅适用于1类。21L 和22L级也仅适用于第1类钢,而91级别钢板也仅适用于第2类钢。2、SA387钢板的制造工艺:钢应为镇静钢。3、SA387钢板的热 处理3.1除91级钢外,所有钢板均应热处理,热处理方法为退火、正火加回火,或者当采购方同意时,从奥氏体化温度采用鼓风或液体淬冷的 方法加速冷却,随后进行回火。最低回火温度如下:类别温度,℉(℃)2,12,111150(620)22,22L,2L,21L,912 50(675)51300(705)3.1.191级钢板应在1900~1975℉(1040~1080℃)正火并在不低于1350~ 1470℉(730~800℃)下回火。3.2级别5、9、21、21L、22、22L和91的订货钢板,当未指明按3.1条的要求热处 理时,则应以消除应力处理或退火状态交货。3.3未指明按3.1条的要求热处理的订货钢板,如需采购热处理时,应有采购方按3.1条和所 适用的表2或表3的要求进行。4、化学成分表1化学成分要求元素成分,%2级S5046012级K1175711级K1178922级K 2159022L级K2159021级K3154521L级K315455级S502009级K9094191级K91560C熔炼分析成 品分析0.05~0.210.04~0.210.05~0.170.04~0.170.05~0.170.04~0.170.05~0.1 5①0.04~0.15①≤0.10≤0.120.05~0.15①0.04~0.15①≤0.10≤0.12≤0.15≤0.15≤0. 15≤0.150.08~0.120.06~0.15Mn熔炼分析成品分析0.55~0.800.50~0.880.40~0.650.3 5~0.730.40~0.650.35~0.730.30~0.600.25~0.660.30~0.600.25~0.660.30~ 0.600.25~0.660.30~0.600.25~0.660.30~0.600.25~0.660.30~0.600.25~0. 660.30~0.600.25~0.66P,≤熔炼分析成品分析0.0250.0250.0250.0250.0250.0250.02 50.0250.0250.0250.0250.0250.0250.0250.0250.0250.0250.0250.0200.02 5S,≤熔炼分析成品分析0.0350.0350.0350.0350.0350.0350.0350.0350.0350.0350.0 350.0350.0350.0350.0300.0300.0300.0300.0100.012Si熔炼分析成品分析0.15~0.4 00.13~0.450.15~0.400.13~0.450.50~0.800.44~0.86≤0.50≤0.50≤0.50≤0.5 0≤0.50≤0.50≤0.50≤0.50≤0.50≤0.50≤1.00≤1.050.20~0.500.18~0.56Cr熔炼分析 成品分析0.50~0.800.46~0.850.80~1.150.71~1.211.00~1.500.94~1.562.00~2. 501.88~2.622.00~2.501.88~2.622.75~3.252.63~3.372.75~3.252.63~3.37 4.00~6.003.90~6.108.00~10.007.9~10.108.00~9.507.90~9.60Mo熔炼分析成品分析 0.45~0.600.40~0.650.45~0.600.40~0.650.45~0.650.40~0.700.90~1.100. 85~1.150.90~1.100.85~1.150.90~1.100.85~1.150.90~1.100.85~1.150.45 ~0.650.40~0.700.90~1.100.85~1.150.85~1.050.80~1.10Ni熔炼分析成品分析..... .................................................0.400.43V熔炼分析成品分 析................................................≤0.04≤0.050.18~0 .250.16~0.27Nb熔炼分析成品分析........................................... ...........0.06~0.100.05~0.11B熔炼分析成品分析........................... .................................N熔炼分析成品分析....................... ...............................0.030~0.0700.025~0.080Al熔炼分析成品分析.. ....................................................0.020.02Ti熔炼分 析成品分析......................................................0.010. 01Zr熔炼分析成品分析..................................................... .0.010.01①厚度大于5in.(125mm)钢板的成品分析碳含量应不大于0.17%。SA387金相组织奥氏体晶粒度--级别为 2的钢板应具有粗的奥氏体晶粒度。SA387力学性能表2第一类钢板的拉伸性能项目2和12级11级22、21、5、9、21L、22L 级抗拉强度,ksi(MPa)55~80(380~550)60~85(415~585)60~85(415~585)屈服强度,ksi( MPa)≥33(230)≥35(240)≥30(205)伸长率(标距8in.或200mm),%①≥18≥19...伸长率(标距2i n.或50mm),%①≥22≥22≥18断面收缩率,%......≥45②≥40③①伸长率的调整见A20/A20M标准。②用圆试样 测定。③用扁平试样测定。表3第二类钢板的拉伸性能①项目2级11级12级22、21、5、9级91级抗拉强度,ksi(MPa)70~ 90(485~620)75~100(515~690)65~85(450~585)75~100(515~690)85~110(585 ~760)屈服强度(0.2%残余变形),ksi(MPa)≥45(310)≥45(310)≥40(275)≥45(310)≥60(415)伸长率②(标距8in.或200mm),%①≥18≥18≥19......伸长率②(标距2in.或50mm),%①≥22≥22≥22≥18≥18断面收缩率,%......≥45②≥40③...①不适用于退火钢板②伸长率的调整见A20/A20M标准。③用圆试样测定。④用扁平试样测定。 |
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