为开发高强度紧固件用非调质钢,在高速线材轧机上进行了试验轧制,并对试制产品的组织性能进行了检测。结果表明,在给定工艺条件下钢的组织基本上为粒状贝氏体组织,抗拉强度为897.5MPa,伸长率为21.8%。热轧材拉拔减面后达到或超过10.9级紧固件的力学性能要求。当拉拔量为25.0%时,可承受59.3%的压缩变形不开裂。
In order to develop a non-quenched and tempered steel for high strength fasteners, experimental production was carried out on a high-speed wire rod mill. The microstrueture and properties of the rolling products was tested. The microstrueture of the steel is basically granular bainite under the given technology, the tensile strength and elongation ratio of the steel are respectively 897.5 MPa and 21.8%. After drawing reduction, the steel can meet or exceed the mechanical requirement of grade 10.9 fasteners. When the drawing reduction is 25.0%, the steel can bear the compression of 59.3% without cracking.
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