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1、锻件用钢化学成分（熔炼分析）应符合的规定JB4726-2000钢 号 化 学 成 分 %CSiMnMoCrVNbPSNiCu20 #0.170.230.170.370.601.000.250.0300.0200.250.2516Mn0.130.190.200.601.201.600.300.0300.0200.300.2535 #0.320.380.170.370.500.800.250.0300.0200.250.2515CrMo0.120.180.100.600.300.800.450.650.801.250.0300.0200.300.2535CrMo0.320.380.170.370.
2、400.700.150.250.801.100.0300.0200.300.251Cr5Mo0.150.500.600.450.654.006.000.0300.0200.500.2520MnMo0.170.230.170.371.101.400.200.350.300.0250.0150.300.2520MnMoNb0.170.230.170.371.301.600.450.650.300.0250.0500.0250.0150.300.2514Cr1Mo0.110.170.500.800.300.800.450.651.151.500.0250.0150.300.2512Cr1MoV0.0
3、90.150.170.370.400.700.250.350.901.200.150.300.0300.0200.300.2512Cr2Mo10.150.500.300.600.901.102.002.500.0250.0150.300.25 注：对真空碳脱氧钢，允许Si含量小于或等于0.12%钢 号公称厚度mm热处理状态回火温度 拉伸试验冲击试验硬度bMPas MPa5 % 试验温度AKV JHB20 #200N390-54021524203410615916Mn300N ，N+T6004506002752003112117835 #100N5106702651820241362001003
4、00N，N+T59049064024518202413019015CrMo300N+TQ+T62044061027520203411818030050043060025520203411517835CrMo300Q+T58062079044015 20341852353005006107804301520341802231Cr5Mo500N+TQ+T68059076039018203417422920MnMo300Q+T60053070037018034156208300500510680350180341362015007004906603301803413019620MnMoNb300Q+
5、T630620790470160341852353005006107804601603418023314Cr1Mo300N+TQ+T62049066029019204113019630050048065028019204112819312Cr1MoV300N+TQ+T680440610255192034118180300500430600245192034115178注：1、根据需方要求，20钢锻件20冲击改作0冲击，冲击功AKV27J 2、当附加保证模拟焊后热处理试样的力学性能时，回火温度可另行规定注：N正火 Q淬火 T回火 A退火 S固溶 各级别的检验项目所按的规定锻件级别检验项目检验数量
6、硬度（HB）逐件检查拉伸和冲击（b、s、5、AKV）同冶炼炉号、同炉热处理的锻件组成一批、每批抽检一件拉伸和冲击（b、s、5、AKV）超声检测逐件检查拉伸和冲击（b、s、5、AKV）逐件检查超声检测逐件检查超声波检测验收标准(各材质均按此标准)锻件分类超声检测合格等级单个缺陷底波降低量密集区缺陷筒形锻件用于筒节用于筒件端部法兰环形锻件饼形锻件公称厚度200mm公称厚度200mm碗形锻件长颈法兰锻件条形锻件注：根据需方要求，对锻件重要区可提高合格等级。锻件高温屈服强度值应符合的规定钢 号公称厚度mm在下列温度（）下的0.2（s），Mpa 20025030035040045050020MnMo30
7、0305295285275260240-300500290280270260245225-500700280270260250235215-20MnMoNb300405395385370355335-300500405395385370355335-15CrMo30022021019618617616716230050020019017616715715214735CrMo300370360350335320295-300500370360350335320295-12Cr1MoV30020019017616715715214230050020019017616715715214214Cr1M
8、o30024023022021020019017530050023022021020019018017012Cr2Mo1300260255250245240230215300500255250245240235225215JB4727-2000钢 号化 学 成 分 % CSiMnMoCrNiVNbAlsPSCu16MnD0.130.180.200.601.201.600.300.400.0300.0150.0250.0150.2520MnMoD0.160.220.170.371.101.400.200.350.300.400.0150.0250.0150.2508MnNiCrMoVD0.100
9、.200.401.101.400.200.500.200.601.201.600.020.060.0200.0150.2510Ni3MoVD0.080.120.150.250.700.900.200.300.302.503.000.020.060.0150.0150.2509MnNiD0.120.150.351.201.600.300.450.850.0500.0150.0200.0150.25 注：1、对真空碳脱氧钢，允许Si含量小于或等于0.12% 2、08MnNiCrMoVD钢的焊接冷裂纹敏感性组成Pcm0.25% Pcm=C+Si/30+Mn/20+Cu/20+Cr/20+Ni/60+
10、Mo/15+V/10+5B(%)钢 号公称厚度热处理状态回火温度 拉伸试验冲击试验bMPas MPa5 % 试验温度Akv J16MnD300Q+T60045060027520-402720MnMoD300Q+T60053070037018-4027300500510680350-30500700490660330-3008MnNiCrMoVD300Q+T60060077048017-404710Ni3MoVD300Q+T60060077048017-504709MnNiD300Q+T60042057026023-7047各级别的检验项目所按的规定锻件级别检验项目检验数量拉伸和冲击（b、s、5、AKV）同冶炼炉号、同炉热处理的锻件组成一批、每批抽检一件拉伸和冲击（b、s、5、AKV）超声检测逐件检查拉伸和冲击（b、s、5、AKV）逐件检查超声检测逐件检查JB4728-2000类 型钢 号化 学 成 分 %CSiMnCrNiMoTi
