Applicable industry

Applicable industry

Construction machinery

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Ningban’s nodulant and inoculant used in parts of construction machines

 

 

Process data

一、Standard of nodulizer

Granularity：3 ～ 20mm

Ingredients Ｓｉ Ｍｇ Ｃａ ＲＥ Ａｌ
Contents（%) 42.0～ 50.0 6.10～7.00 2.00～2.80 2.00～2.80 ＜ 1.20

二、Test

1.Material：FCD500

2.TP conditions

NO. 1 2 3 4 5
TP spectrum testing sample    (min) 1 6 9 15 17
TP test block casting time    (min) 1 6 9 15 17
※Sampling: Calculated starts from the completion the spheroidizing reaction

3.Test items：vary with the reaction time：①Using TP spectrum test samples to confirm the content change of residual Mg of molten iron.

                ②Using TP test blocks to identify the spheroidizing or inoculation fade status.

4.Inoculation method：0.5%

5.Molten iron outlet temperature：1490℃

6.Spheroidizing reaction time：1ˊ44〞

三、Test item

1.Ingredients：

Spectrum TP code Sampling time Kg Molten iron qty. C Si Mn P S Mg Ce Cu Ti Sn
Kg ％ ％ ％ ％ ％ ％ ％ ％ ％ ％
YT     3.72  1.82  0.26  0.028  0.0190    0.002  0.08  0.0126  0.009 
CT-1 0:01 2230       0.021  0.0107  0.0475  0.014  0.36  0.0110  0.007 
CT-2 0:06 660       0.020  0.0104  0.0465  0.013  0.36  0.0105  0.007 
CT-3 0:09         0.020  0.0115  0.0445  0.013  0.35  0.0115  0.007 
CT-4 0:15         0.021  0.0112  0.0426  0.012  0.36  0.0104  0.008 
CT-5 0:17         0.021  0.0120  0.0417  0.010  0.35  0.0100  0.006 

2.TP's mechanical properties and structure

NO. TP code Time Kg Molten iron qty.   ResidualMg  Yielding σb δ HB graphite ball qty. Graphite ball diameter nodularity Pearlitic rate
min Kg  ％ N/mm2 N/mm2 ％   n/mm2 μm ％ ％
          ≥320 ≥500 ≥7 170～230     ≥70 ≥30
(1) T1 0:01 2230 0.0475  434.0  725.5  8.0  228.0  97.2  49.6  96.5  78.3 
(2) T2 0:06 660 0.0465  445.5  715.4  8.2  226.0  98.6  48.7  95.8  77.6 
(3) T3 0:09   0.0445  424.6  703.8  8.4  226.0  100.8  45.7  96.3  75.1 
(4) T4 0:14   0.0426  417.1  685.3  8.4  224.0  103.8  44.3  96.0  72.8 
(5) T5 0:17   0.0417  420.6  678.9  9.0  226.0  109.4  43.8  93.2  70.4 

3.Microstructure（100X）

四、Conclusion

Date Nodulizer granularity distribution  Spheroidizing reaction Fe resid Duration Mg residue change TP nodularity Graphite    form  TP graphite ball qty.
3～20mm 50〞～2min Kg min 0.03～0.05％ ≥70%   n/mm2
8828 10～15mm居多 1′44〞 660 17 0.0475→0.0417
（△0.0058％）		 93.2～96.5 球状 95～120
The test production had a good spheroidizing reaction with the granularity distribution mainly between 10～15mm, and the graphite still kept the spheroidal form after 17 minitues.                                                                                                                                                                    

 

 

 

 

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