The mooring chain steel comprises the following components in percentage by mass: 0.20 to 0.40 percent of C, 0.10 to 0.50 percent of Si, 0.20 to 1.20 percent of Mn, 0.50 to 2.00 percent of Cr, 1.00 to 3.50 percent of Ni, 0.60 to 1.60 percent of (Mo + V), 0.005 to 0.065 percent of Nb, 0.004 to 0.020 percent of N, less than or equal to 0.015 percent of P, less than or equal to 0.008 percent of S and the balance of Fe and impurities. And the fluctuation amplitude delta C of the physical cross section of C is less than or equal to 0.03%. According to the mooring chain steel and the mooring chain manufactured through the mooring chain steel, the tensile strength ranges from 1000 MPa to 1250 MPa, and two strength levels of R5 and R6 are covered; by adding superfine and dispersed Mo and V carbonitride, the multiplication effect of capturing hydrogen in steel is generated, the critical hydrogen concentration of cracks which do not expand in chain ring service is multiplied, the volume fraction of carbonitride is improved, meanwhile, finer austenite grains are obtained, the obdurability of a chain ring is stabilized, and the service reliability of a mooring chain is guaranteed; the fluctuation amplitude of the cross section C is reduced from C > = 6% to C < = 3%, and the phenomenon that the strength of existing R5 and R6 grade products fluctuates greatly is avoided.
本发明涉及一种高环境裂纹抗力的系泊链钢及系泊链,系泊链钢的组份及质量百分比为C0.20~0.40%,Si0.10~0.50%,Mn0.20~1.20%,Cr0.50~2.00%,Ni1.00~3.50%,(Mo+V)0.60~1.60%,Nb0.005~0.065%,N0.004~0.020%,P≤0.015%,S≤0.008%,余量为Fe和杂质;C的实物横截面波动幅度ΔC≤0.03%。本发明提供的系泊链钢及其制造的系泊链,抗拉强度1000~1250MPa,涵盖R5和R6二个强度级别;增加极细和分散的Mo和V的碳氮化物,产生捕获钢中氢的相乘效应,成倍提高链环服役中裂纹不发生扩展的临界氢浓度,提高碳氮化物体积分数的同时获得更细化的奥氏体晶粒,稳定链环的强韧性,保证系泊链的服役可靠性;减少实物链的成分波动,横截面C的波动幅度由△C≥6%减少至△C≤3%,避免现有R5和R6级产品的强度大幅度波动现象。
Mooring chain steel with high environmental crack resistance and mooring chain
一种高环境裂纹抗力的系泊链钢及系泊链
2023-05-30
Patent
Elektronische Ressource
Chinesisch
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