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发明授权
CN108239720B 一种X80钢、X80钢板及其三通的制备方法 有权

一种X80钢、X80钢板及其三通的制备方法
摘要：
本发明公开了一种X80钢、X80钢板及其三通的制备方法。其中，一种X80钢，包括以下元素，每种元素的重量百分比为：C 0.12～0.2％，Si 0.2～0.3％，Mn 0.7～1.0％，P≤0.01％，S≤0.005％，Cr 0.15～0.35％，Mo 0.25～0.35％，Cu 0.5～0.8％，Ni 0.9～1.1％，Nb 0.02～0.04％，Ti≤0.01％，V≤0.02％，控制Mn/C 5～6，Ni/Cu 1.3～2，Nb+V+Ti≤0.05％，Ceq 0.46～0.55％。本发明提供的一种X80钢为制造壁厚不大于90mm的符合X80钢级三通技术指标的三通提供原材料。
摘要（英）：

The invention discloses X80 steel, an X80 steel plate and a preparation method of a three-way joint made from the X80 steel. The X80 steel comprises the following elements in percentage by weight: 0.12-0.2% of C, 0.2-0.3% of Si, 0.7-1.0% of Mn, less than or equal to 0.01% of P, less than or equal to 0.005% of S, 0.15-0.35% of Cr, 0.25-0.35% of Mo, 0.5-0.8% of Cu, 0.9-1.1% of Ni, 0.02-0.04% of Nb,less than or equal to 0.01% of Ti and less than or equal to 0.02% of V, wherein a ratio of Mn/C is controlled to be 5-6, a ratio of Ni/Cu is controlled to be 1.3-2, the sum of weigh percents of Nb, Vand Ti is controlled to be less than or equal to 0.05%, and Ceq is controlled to be 0.46-0.55%. The X80 steel provided by the invention provides a raw material for preparing a three-way joint which has the wall thickness not more than 90mm and accords with technical indexes of an X80 grade steel three-way joint.

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