GB699-88_优质碳素结构钢技术条件.doc

1、GB699-88 优质碳素结构钢技术条件本标准适用于直径不大于250mm的优质碳素钢热轧和锻制条钢起，其化学成分也适用于锭、坯及其制品。1. 分类1.1钢材按使用方法不同分为两类,钢材的使用加工方法应在合同中注明,未注明者按切削加工用钢.a)压力加工用钢(热压力加工,顶锻及冷拔坯料);b)切削加工用钢.2. 尺寸,外形,重量2.1热轧钢材的尺寸,外形,重量及其允许偏差应符合GB702-88的规定,其尺寸精度应符合第2组的规定.截面尺寸大于150mm的钢材应符合第3组的规定.交货时不得搭配短尺.2.2锻制钢材的尺寸,外形,重量及其允许偏差应符合GB908-87锻制圆钢和方钢尺寸,外形,重量及允许

2、偏差的规定,其尺寸精度和弯曲度应符合第2组的规定.交货时不得搭配短尺.2.3其他截面形状钢材的尺寸,外形,重量及其允许偏差应符合相应标准的规定.3. 技术要求3.1牌号及化学成分3.1.1钢的牌号及化学成分(熔炼分析)应符合表1的规定.表1牌号化学成分，%（单值为）CSiMnPSNiCrCu08F0.05-0.110.030.25-0.500.0350.0350.250.250.2510F0.07-0.140.070.25-0.500.0350.0350.250.250.2515F0.12-0.190.070.25-0.500.0350.0350.250.250.25080.05-0.120.

3、17-0.370.35-0.650.0350.0350.250.250.25100.07-0.140.17-0.370.35-0.650.0350.0350.250.250.25150.12-0.190.17-0.370.35-0.650.0350.0350.250.250.25200.17-0.240.17-0.370.35-0.650.0350.0350.250.250.25250.22-0.300.17-0.370.50-0.800.0350.0350.250.250.25300.27-0.350.17-0.370.50-0.800.0350.0350.250.250.25350.32-

4、0.400.17-0.370.50-0.800.0350.0350.250.250.25400.37-0.450.17-0.370.50-0.800.0350.0350.250.250.25450.42-0.500.17-0.370.50-0.800.0350.0350.250.250.25500.47-0.550.17-0.370.50-0.800.0350.0350.250.250.25550.52-0.600.17-0.370.50-0.800.0350.0350.250.250.25600.57-0.650.17-0.370.50-0.800.0350.0350.250.250.256

5、50.62-0.700.17-0.370.50-0.800.0350.0350.250.250.25700.67-0.750.17-0.370.50-0.800.0350.0350.250.250.25750.72-0.800.17-0.370.50-0.800.0350.0350.250.250.25800.77-0.850.17-0.370.50-0.800.0350.0350.250.250.25850.82-0.900.17-0.370.50-0.800.0350.0350.250.250.2515Mn0.12-0.190.17-0.370.70-1.000.0350.0350.250

6、.250.2520Mn0.17-0.240.17-0.370.70-1.000.0350.0350.250.250.2525Mn0.22-0.300.17-0.370.70-1.000.0350.0350.250.250.2530Mn0.27-0.350.17-0.370.70-1.000.0350.0350.250.250.2535Mn0.32-0.400.17-0.370.70-1.000.0350.0350.250.250.2540Mn0.37-0.450.17-0.370.70-1.000.0350.0350.250.250.2545Mn0.42-0.500.17-0.370.70-1

7、.000.0350.0350.250.250.2550Mn0.47-0.550.17-0.370.70-1.000.0350.0350.250.250.2555Mn0.52-0.600.17-0.370.70-1.000.0350.0350.250.250.2560Mn0.57-0.650.17-0.370.70-1.000.0350.0350.250.250.2565Mn0.62-0.700.17-0.370.90-1.200.0350.0350.250.250.2570Mn0.67-0.750.17-0.370.90-1.200.0350.0350.250.250.253.1.1.1使用废

8、钢冶炼的钢允许含铜量不大于0.30%.3.1.1.2热加工加工用钢的含铜量不大于0.20%.3.1.1.3铅浴淬火(派登脱)钢丝的35-85钢的含锰量为0.30%-0.60%,65Mn及70Mn的含锰量为0.70%-1.00%,含铬量不大于0.10%,含镍量不大于0.15%,含铜量不大于0.20%S,P含量也应符合钢丝的标准要求,但不大于表1中的指标.3.1.1.4 08钢也可用铝脱氧冶炼镇静钢,含锰量下限为0.25%,含硅量不大于0.03%,含铝量为0.02-0.07%,此时牌号为08Al.3.1.1.5冷冲压用沸腾钢含硅量不大于0.03%.3.1.1.6氧气转炉冶炼的钢其含氮量不大于0.0

9、08%.供方保证合格时可不做分析.3.1.1.7经供需双方协议,08-25钢可供含硅量不大于0.17%的半镇静钢,其牌号为08b-25b.3.1.2钢材和钢坯的化学成分允许偏差应符合GB222-84钢的化学成分用试样取样法及成品化学成分允许偏差中表2的规定.表2牌号试样毛坯尺寸mm热处理制度， 力学性能，不小于钢材交货状态硬度HB（）正火淬火回火bN/mm2sN/mm2S%AKJ未热处理热处理08F25930295175356013110F25930315185335513715F259203552052955143082593032519533601311025930335205315513

10、715259203752252755143202591041024525551562525900870600450275235071170302588086060049029521506317935258708506005303152045551974025860840600570335194547217187452585084060060035516403922919750258308306006303751440312412075525820820600645380133525521760258106754001235255229652581069541010302552297025790

11、71542093026922975试样820480108088073028524180试样820480108093063028524185试样820480113098063030225515Mn25920410245265516320Mn25910450275245019725Mn2590087060049029522507120730Mn2588086060054031520456321718735Mn2587085060056033518455522919740Mn2586084060059035517454722920745Mn2585084060062037515403924121750Mn2583083060064539013403125521760Mn25810695410113526922965Mn2581073543093028522970Mn25790785450830285229注：1、75，80及85钢用留有加工余量的试样进行热处理。2、对于直径或厚度小于25mm的钢材，热处理是在与成品截面尺寸相同的试样毛坯上进行。3、表中所列正火推荐保温时间不少于30min，空冷；淬火推荐保温时间不少于30min，水；回火推荐保温时间不少