This standard specifies the classification grades, technical requirements, test methods and inspection rules of forsterite sand for foundry. This standard applies to forsterite sand used for mold core making in foundry production. JB/T 6985-1993 Forsterite sand for casting JB/T6985-1993 Standard download and decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
Forsterite Sand for Casting
Subject Content and Scope of Application
JB/T 6985--- 93
This standard specifies the requirements for casting Classification grades, technical requirements, test methods and inspection rules of forsterite sand. This standard is applicable to forsterite sand used for core molding in foundry production. 2 Referenced standards
GB 2684
GB 5611
GB9442
YB368
Test methods for raw sand and mixtures used in castings
Casting noun Terminology
Silica sand for casting
Refractory test method
Analysis method for magnesia refractory material
YB377
Z3 J31004
Test for casting Screen
3 Terms
3.1 Forsterite sand for casting
Forsterite sand for casting is a natural ore composed of forsterite and fayalite, which is crushed, washed and screened Sand suitable for modeling after separation.
3.2
Loss on ignition
The loss on ignition refers to the total constant weight of the sample after drying at 105110C to remove free moisture and burning at a high temperature of 950~1000℃ , the percentage of burning fire weight to dry sample weight. Classification, grouping and grade
4
Grading
4.1
Forsterite sand for foundry is classified as level three according to its chemical composition and physical properties according to Table 1. Table 1
Level code
Level
Level 2
Level 3
4.2 group
Mgo)
%| |tt||≥47
244
≥42
SiO
%
40
42
44| |tt||FcO
%
10
10
10
Loss on ignitionwww.bzxz.net
%
1.5
3
3
Forsterite sand for casting is divided into 5 groups according to its particle size as specified in Table 2. Approved by the Ministry of Machinery Industry of the People's Republic of China on July 27, 1993 2
moisture content
0.5
0.5
.0
containing mud scenery||tt ||%
0.5
0.5
50.5
Refractory degree
1690
a1 690
1 690|| tt | |15
10
4.3 grade
Chishou
i
0.85
A15%
0.60||tt ||15%
15%
JB/T 6985--93
Table 2
0.425
≥75%
15 %
15%
The grade expression method of forsterite sand for casting is as follows: ZMGS
Example: ZMGS1-30
5 Technical requirements
5.1 Appearance
XX
0.30
75%
Particle size grouping code
0.212
≥75%
Magnesia ( MgO) grade code
0.15
≥75%
0.106
%
0.075
10%
.10 % | |tt | Trace amounts of black particles are allowed. 10
5.2 Chemical composition
The content of magnesium oxide, silicon dioxide and ferric oxide is used as the basis for acceptance. The chemical composition should comply with Table 1. stipulations.
5.3 Physical properties
The ignition loss, moisture content, and refractoriness of forsterite sand for casting should comply with the requirements of Table 1. 5.4 Grain size
Magnesium for casting. The main particle size composition of olivine sand should comply with the provisions of Table 2. Technical items not listed in this standard (such as pH value, sintering point, etc.) shall be specified in the agreement by both parties if required by the buyer. 5.5||tt| |Test method
6
6.1 Appearance: Daily test.
6.2 Magnesium oxide, silica, ferric oxide and ignition loss of forsterite sand for casting. The measurement is carried out according to YB377. 6.3 The determination of the refractory degree of forsterite sand for casting is carried out according to YB368. The determination of the particle size composition and moisture content of forsterite sand for casting is carried out according to GB2684
Inspection Rules||tt. ||7
7.1
The sampling methods for various tests of forsterite sand for casting are carried out in accordance with GB2684. The batch size of magnesium olivine sand for casting is determined according to the supply situation, but the weight of each batch of products shall not exceed 30t at most. 7.2
7.3 Each batch of forsterite sand supplied by the supplier must be inspected according to the items stipulated in this standard, and the inspection results and grade should be filled in the quality certificate. The purchaser clicks here Carry out acceptance. JB/T 6985---93
7.4 The demander shall re-inspect or spot-check the quality of forsterite sand for casting. If it is inconsistent with the quality certificate, it may be re-inspected with the supplier. 8 Marking, packaging, Transportation and Storage
8.1 Forsterite sand for casting should be packed in woven bags lined with plastic bags. 8.2 The packaging weight is divided into two types: 25kg and 50kg net weight per bag. 8.3
There should be obvious signs on the packaging bags, indicating the brand name, product name, weight, batch number and the full name of the supplier. 8.4 Rain and flooding should be prevented during transportation and storage. Additional notes:
This standard is proposed by the National Casting Standardization Technical Committee. This standard is under the jurisdiction of the Shenyang Casting Research Institute of the Ministry of Machinery Industry. This standard is drafted by the Shenyang Casting Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Chen Qiuying and Li Shicheng. 526
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