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Automotive

Ningban’s lanthanide nodulant used in automotive brake brackets

Casting’s specification

Weight: 3.2 kg

Material: FCD450

Spheroidization rate: > 80

Mechanical property: with a tensile strength of above 450Mpa

Experimental purpose: to learn about the applicability of lanthanide spheroidized alloy (La series nodulizers)in special structural brackets (thin-walled castings) and its contribution to performance and reverse chill improvement.

Experimental process:

1. Spheroidized alloy

Specimen

Granularity

Alloy content

NBCH-5.5(HC)

5-25MM

0.75%

45.57%

2.14%

0.40%

5.62%

2. The composition of raw molten iron in the furnace is confirmed as follows: (%)

C	Si	S	Mn	P	Al	Ce	Others
3.7372	2.2850	0.0087	0.1766	0.0253	0.0023	0.0038	Trace
3.7151	2.3172	0.0078	0.1413	0.0258	0.0017	0.0036	Trace

Spheroidization process

Due to the smaller H/D ratio, the reaction in the ladle is more intense, and the Mg absorption rate is lower, standing at about 64%.

Confirmation of the spheroidization process: Based on the properties of NBCH-5.5(HC) alloy the wall thickness of the cast iron product, the S content in the raw molten iron, and the intended spheroidization degree of the bracket, the dosage is as follows:

3. Experimental data:

C	Si	S	Mn	P	Al	Ce	Mg
3.43-3.60%	2.70-2.88%	0.006-0.011%	0.15-0.18%	0.023-0.026%	0.008-0.009%	0.004-0.006	0.031-0.034%
3.41-3.52%	2.82-2.95%	0.006-0.009%	0.15-0.16%	0.024-0.025%	0.008-0.009%	0.004-0.006	0.031-0.035%
Spheroidization rate：above 90%；Qualified				Matrix structure: no carbide; dense matrix without obvious shrinkage porosity; Specific module 2 slightly shrank: Qualified