SCR生产线结晶腔铜液凝固行为及质量控制

doi:10.13229/j.cnki.jdxbgxb20200653

Abstract

Abstract:

The stability of temperature field control directly affects the stability of production and quality. Based on the practical production experience, the solidification behavior of molten copper in the continuous casting system of SCR continuous casting and rolling production line and its influencing factors were studied. The influence mechanisms （temperature field, flow field, and solidification crystallization behavior of copper liquid）of casting process parameters such as casting temperature, casting speed, acetylene flow rate and cooling water control were discussed. The formation reasons (casting temperature, casting speed and cooling water flow rate fluctuate greatly) of microstructure defects were analyzed, and the optimization method of slab quality was proposed. The research work has important reference significance for analyzing SCR production line to improve the quality of copper rod.

Key words: material synthesis and processing technology, continuous casting and rolling, copper billet, solidification behavior, process optimization

CLC Number:

TF811

Hui-shuang JI,Yan PENG,Yang LIU,Yan-bo YANG,Kun GAO,Li-min ER. Solidification behavior and quality control of molten copper in SCR production line[J].Journal of Jilin University(Engineering and Technology Edition), 2021, 51(6): 2021-2030.

Figures/Tables 13

Fig.1

Fig.2

Fig.3

Fig.4

Fig.5

Fig.6

Table 1

Fig.7

Fig.8

Table 2

Basic model of copper solidification"

计算目标	模型	模型表达式	相关参数
温度场	二维热传导方程	$? ? x λ ? T ? x + ? ? y λ ? T ? y + q * = c ρ ? T ? t$	$ρ$ 为材料密度；c为材料比热； $q *$ 为微体内热源产生的热量。
形核密度	连续形核模型	$d n d Δ T = n m a x 2 π Δ T σ e x p - 12 Δ T - Δ T ˉ Δ T σ 2$	$Δ T σ$ 为合金标准方差过冷度； $Δ T ˉ$ 为最大形核过冷度； $n m a x$ 为最大形核数。
形核概率	经验公式	$P n = δ n ? V m$	$P n$ 为形核概率； $δ n$ 为形核密度； $V m$ 为每个网格单元的体积。
形核判定	形核判定方程	$A x, y = 0, P n t + Δ t ≤ n 1, P n t + Δ t > n$	$A x, y$ 为元胞的状态；n为0到1的任意值。
柱状晶生长	KGT模型	$ν = α Δ T 2 + β Δ T 3$	α、β为回归系数，与合金自身成分有关。
等轴晶生长	溶质扩散模型	$f s = f g ? f i = f g Ω P e g, P e g = R v i D l g P e g = 1 + 3 2 P e g + 1 P e g 2 + 1 4 P e g 3$	$f s$ 、 $f g$ 、 $f i$ 分别为已凝固初生枝晶、液相和球状晶粒中的固相分数；Ω为过饱和度； $g P e g$ 为Peclet数的函数。
生长概率	生长长度计算	$l t + δ t = ∫ t t + δ t V Δ T t d t c o s θ + s i n θ$	$δ t$ 为微观时间步长； $V$ 为生长速度； $Δ T t$ 为t时刻过冷度； $θ$ 为对象元胞晶体学取向与该元胞与邻居元胞连线的夹角。
生长判定	判定方程	$A x, y = 0, Δ f s δ t < 1 1, Δ f s δ t = 1$	$Δ f s δ t$ 为在一个微观时间步长 $δ t$ 内固相率的变化。
微观时间步长	时间步长方程	$Δ t = Δ x 2 ρ c 6 ? λ$	λ为合金导热率； $Δ x$ 为微观空间距离。
宏观时间步长	时间步长方程	$δ t = m i n d x V m a x δ t, d x 2 D L 1 n u m b e r ≥ 3$	$V m a x δ t$ 为所有生长状态元胞生长速度的最大值。

Table 2

Table 3

Fig.9

Fig.10

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	结晶轮侧冷却水		钢带侧冷却水
	流量/（L·min^-1）	喷嘴个数	流量/（L·min^-1）	喷嘴个数
冷却1区	8.327~29.523	15	7.57~22.71	14
冷却2区	37.85	14	25.738	14
冷却3区	38.85	7	28.766	10

工况	铸机速度/（t·h^-1）	浇包温度/℃	水温/℃	铸轮侧温度/℃	NIP/（L·min^-1）	冷却水流量/（L·min^-1）
工况	铸机速度/（t·h^-1）	浇包温度/℃	水温/℃	铸轮侧温度/℃	NIP/（L·min^-1）	钢带1	钢带2	钢带3	铸轮内1	铸轮内2	铸轮内3	机器侧	操作侧
a	24.5	1136	28	94	51	153	326	309	253	509	506	98	100
b	25	1129	20	99	58	154	295	298	251	498	490	96	93
c	24.5	1118	25	77	55	152	292	302	250	506	486	87	84
d	24	1116	29	79	50	151	298	305	257	505	475	85	83
e	24.5	1116	24	83	53	154	281	320	260	502	480	83	99
f	24.5	1124	28	83	51	151	299	306	258	507	479	83	85

Solidification behavior and quality control of molten copper in SCR production line

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