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一.,Q390是高强度结构钢板相同材质:Q420.Q460.Q500.Q550.Q690.Q890.Q980., 钢的牌号由代表屈服强度的汉语拼音字母,屈服强度数值,质量等级符号三个部分组成,例如:, Q390C。其中:, Q—钢的屈服强度的“屈”字汉语拼音首位字母,, 390—屈服强度数值,单位MPa,, C—质量等级为等级(等级分为B,C,D,E)。, 当需方需要钢板具有厚度方向性能时,则在上述规定的牌号后加上代表厚度方向(Z向)性能级别的符号。, Q390,是一种低合金高强度结构钢。
化学成分 【化学成分】(质量分数)(%), 等级,C,Mn,Si,,P,,S,,V,,Nb,,Ti,,Al,,Cr,Ni,,
A,,≤0.20,1.00~1.60,,≤0.55,≤0.045,≤0.045,,0.02~0.20,,0.015~0.060,,0.02~0.20,,-,≤0.30,≤0.70,
B,≤0.20,1.00~1.60,,≤0.55,≤0.040,≤0.040,0.02~0.20,,0.015~0.060,,0.02~0.20,,-,≤0.30,≤0.70,
C,≤0.20,1.00~1.60,≤0.55,≤0.035,≤0.035,0.02~0.20,,0.015~0.060,,0.02~0.20,,≥0.015,,≤0.30,,≤0.70,
D,≤0.20,1.00~1.60,≤0.55,≤0.030,≤0.030,0.02~0.20,,0.015~0.060,,0.02~0.20,,≥0.015,,≤0.30,,≤0.70,
E,≤0.20,1.00~1.60,≤0.55,≤0.025,≤0.025,0.02~0.20,,0.015~0.060,,0.02~0.20,,≥0.015,,≤0.30,≤0.70,
编辑本段力学性能 【抗拉强度】(σb/MPa), 490~650, 【伸长率】(δ5/%), 等级,δ5/%,
A,≥19,
B,≥19,,
C,≥20,
D,≥20,
E,≥20,
【屈服点】(σs/MPa), 厚度(直径、边长)/mm,,≤16,,>16~35,,>35~50,,>50~100,,
σs/MPa,≥390,≥370,,≥350,,≥330,,
【冲击吸收功】(Akv(纵向)/J), 等级¦温度,,20℃,0℃,-20℃,-40℃,
A,?,?,?,?,
B,≥34,?,?,?,
C,?,≥34,,?,?,
D,?,?,≥34,,?,
E,?,?,?,≥27,,
编辑本段主要特性 综合力学性能好,焊接性、冷、热加工性能和耐蚀性能均好,C、D、E级钢具有良好的低温韧性。编辑本段应用举例 船舶、锅炉、压力容器、石油储罐、桥梁、电站设备、起重运输机械及其他较高载荷的焊接结构件。