固溶处理对316H不锈钢中厚板晶粒度的影响

Effect of solution treatment on grain size of 316H stainless steel medium plate

将300 mm厚316H不锈钢电渣锭锻造坯轧制成50 mm厚钢板,选取晶粒度为5、6、7和9级的原始晶粒,进行了1000℃固溶60 min和120 min、1050℃固溶30 min和60 min、1100℃固溶20、40和60 min。结果表明,获得晶粒均匀的完全再结晶热轧态组织是获得晶粒均匀固溶态组织的必要条件,热轧态混晶或者有部分再结晶的组织,通过固溶处理不能获得晶粒均匀的固溶态组织。热轧态晶粒均匀的钢板,通过合理匹配固溶温度与时间,晶粒能够均匀长大,厚度为20~50 mm的316H不锈钢中厚板合理的固溶制度为1050℃保温30~60 min,1100℃保温20~40 min,可根据热轧态组织及用户需求调整固溶时间获得理想的晶粒度级别。

316H stainless steel with 300 mm thickness electroslag ingot forging billet rolled to steel plate with 50 mm thickness,the original grains sizes of grade 5,6,7 and 9 were selected.Solution tests were carried out at 1000℃for 60 min and 120 min,1050℃for 30 min and 60 min,and 1100℃for 20,40 and 60 min.The results show that obtaining a fully recrystallized hot-rolled microstructure with uniform grains is a necessary condition for obtaining solution microstructure with uniform grain.For hot-rolled mixed crystals or partially recrystallized microstructure,a solution microstructure with unifor grain cannot be obtained by solution treatment.For the hot-rolled steel plate with uniform grains,by reasonably matching the solution temperature and time,the grains can grow uniformly.The reasonable solution system of the 316H stainless steel plate with thickness of 20-50 mm is solution at 1050℃for 30-60 min,and at 1100℃for 20-40 min,the solution time can be adjusted according to the hot-rolled microstructure and user needs to obtain the ideal grain size level.