How To Produce Casting Grinding Media Balls

Release time：2021-10-12

Ductile iron casting process  

1. Requirements of metal charge  

1.1 The composition of all kinds of incoming metal charge must be clear. Except for the iron and scrap, which are determined by the batching personnel in front of the furnace according to the condition of the charge, rebar is not allowed to be added into the ductile iron.  The rest of the charge must have chemical composition test sheet before use, at the same time should ensure that the charge, alloy dry.  1.2 Prevent airtight containers from mixing in the charge.  

1.3 All charge shall be weighed separately according to the ingredients.  2.1 Chemical composition of nodular cast iron  

brand  

c  

si  

Mn  

P  

s  

cu  

Ni  

Re  

Mg  

QT400LT  

3.7 f3.8  

2.0/2.15  

0.1/0.15  

< 0.1  

< 0.02  

0.02/0.03  

0.05/0.06  

QT400  

3.55/3.75  

2.5/2.7  

< 0.3  

< 0.1  

< 0.02  

0.03/0.06  

0.03/0.06  

QT450  

3.55/3.75  

2.5/2.7  

0.3/0.45  

< 0.1  

< 0.02  

0.02/0.05  

0.03/0.07  

QT500  

3.55/3.75  

2.4/2.55  

0.40/0.55  

< 0.08  

< 0.02  

0.02/0.05  

0.03/0.05  

QT600  

3.6/3.8  

2.0/2.3  

0.5/0.7  

< 0.08  

< 0.02  

0.02/0.05  

0.035/0.07  

QT700  

3.6/3.8  

1.9/2.15  

0.7/0.9  

< 0.08  

< 0.02  

0.02/0.05  

0.035/0.05  

QT800  

3.55/3.8  

1.8/2.0  

0.7/0.9  

< 0.08  

< 0.02  

0.5/0.8  

0.35/0.5  

Normalizing + tempering  

0.02/0.045  

0.035/0.06  

QT900  

3.55/3.8  

1.7/2.0  

0.7/0.9  

< 0.08  

< 0.02  

0.15/0.2  

0.45/0.6  

Normalizing + tempering  

0.02/0.045  

0.035/0.06  

note  

Thick wall castings  

Thick wall castings  

Thick wall castings  

Take the lower limit, thin  

Take the lower limit,  

Take the upper limit, thin  

Wall casting take  

Thin wall casting  

Wall casting take  

ceiling  

Take limit  

The lower limit  

Mechanical properties of single cast nodular cast iron (GB/T1348-1988)  

brand  

Tensile strength  

The yield strength  

Elongation after fracture  

hardness  

T-notch specimens were hit by shock absorption at -20℃  

The main group  

B/MPa or greater  

B/MPa or greater  

(%)  

HBS  

QT40OLT  

400  

250  

18  

130-17O3 is larger than 12 on average, and larger than 9 on individual  

Ferrite > 95%  

QT400-18  

400  

250  

18  

130-170.  

Ferrite > 90%  

QT400-15  

400  

250  

15  

130-180.  

Ferrite > 90%  

QT450-10  

450  

310  

10  

160-210.  

ferrite  

QT500-7  

500  

320  

7  

170-230.  

Ferrite + pearlite  

QT600-3  

600  

370  

3  

190-270.  

Pearlite + ferrite  

QT700-2  

700  

420  

2  

225-305.  

pearlite  

QT800-2  

800  

480  

2  

245-335.  

Pearlite or tempered texture  

QT900-2  

900  

600  

28O-360  

Bainite or tempered martensite  

3. Scope of chemical composition and mechanical properties control in melting process:  

Chemical composition control range in melting process  

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