B元素对原油船耐蚀钢全位置药芯焊丝熔敷金属低温韧性影响

打开文本图片集

中图分类号：TG457.11

Effect of B on the toughness of all-position flux-cored wire of corrosion resistant steel for crude oil tanker

SUN Chao¹，FEI Dakui²，LI Rong²，WANG Ziran³，LIU Houtao4，GU Sen5 （1. CRRC Dalian Locomotive and Rolling Stock Co.， Ltd. Carbody Branch Factory，dalian 116022，China; 2.Harbin Welding Institute Limited Company，Harbin 150028，China ; 3.Harbin University of Commerce，Harbin 150028，China； Nanjing Yitao Technology Co.，Ltd.，Nanjing 210o08，China;5. Changzhou University，Changzhou 213164，China

Abstract：Five types of C-Mn-Ni-Cu al-position flux-cored wires with varying B contents are designed and developed for corrosion-resistant steel in crude oil tanker.Deposited metals with B contents ranging from 0% to （2号 0.013% are prepared using 100% CO gas shielded welding. Optical microscopy（OM）and scanning electron 2 microscopy（SEM）are employed to study the effctof B content on the microstructure evolution ofthe deposited metal.Mechanical properties are evaluated through impact tests.The results indicate that as the B content increases from 0% to 0.001 3% ，the formation of Ferrite side plate （FSP）within the weld zone is suppressed， and the proportion of acicular ferite（AF） increases，exhibiting a refined microstructure with an interlocking distribution. Consequently，the low-temperature impact toughness value KV2（∇-40∇Φ） increases from 34 J to 102 J.As the B content further increases from 0.0060% to 0.013% ，both FSP and proeutectoid ferrite （PF） disappear within the weld zone，and the microstructure is AF.This leads toan increase in the low-temperature toughness from 101 Jto 118 J. The deposited metal of the C-Mn-Ni-Cu all-position flux-cored wire for corrosion-resistant steel in crude oil tanker reaches its highest low-temperature impact toughness value

KV2（∇-409C） ataBcontentof 0.013% ·

Key Words：crude oil tanker corrosion-resistantsteel；all-position flux-cored wire；Bcontent；low-temperature toughness；acicular ferrite；SEM

0 前言

油轮是原油海洋运输的关键装备[1]。（剩余4288字）