JB/T 53440-1999 Quality classification of natural silica sand for foundry JB/T53440-1999 Standard download decompression password: www.bzxz.net

JB/T53440
—1999
This standard is a revision of JB/T53440--94 "Quality Grading of Water-Washed Natural Silica Sand for Casting". The main technical contents remain unchanged. This standard replaces JB/T53440--94 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Foundry Standardization. The responsible drafting unit of this standard is Shenyang Foundry Research Institute. During the revision, the original standard was revised as "Edited Standard Drafters: Li Shicheng, Guan
Jian, Sun Gongwen, Zhao Lijie, Jiang Zhengyong. 596
1 Scope
Machinery Industry Standard of the People's Republic of China
Water-washed Natural Silica Sand for Casting
Product Quality Grading
(Internal Use)
JB/T53440
Replaces JB/T53440~9
This standard specifies the quality requirements, test methods and evaluation methods for the grading of water-washed natural silica sand for casting. This standard applies to Natural silica sand for foundry that has been washed, scrubbed or flotated. 2 Cited standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T2684--1981 Test methods for raw sand and mixtures for foundry GB/T7143---1986 Chemical analysis methods for silica sand for foundry GB/T9442-1998 Silica sand for foundry
JB/T 9156--1999
Test sieve for casting
3 Grading requirements
3.1 Basic provisions
3.1.1 Natural silica sand for casting is divided into natural silica sand for steel casting, natural silica sand for iron casting and natural silica sand for non-ferrous alloy casting according to its use. 3.1.2 Natural silica sand for steel casting and natural silica sand for iron casting are divided into superior sand, first-class sand and qualified sand according to their quality. Natural silica sand for non-ferrous metal casting can be used for reference. 3.2 Grading indicators
3.2.1 2. Silicon oxide content, mud content and angular factor 3.2.1.1 The grading indicators of natural silica sand for steel casting shall comply with the provisions of Table 1 . Table 1
Silicon dioxide content, %
Mud content, %
Angular factor
Superior sand
3.2.1.2 The grading index of natural silica sand for cast iron shall comply with the provisions of Table 2. Approved by the State Bureau of Machinery Industry on December 30, 1999
First-class sand
Qualified sand
2000-06.01 Implementation
Silicon dioxide content, %
Mud content %
Angular factor
JB/T53440—1999
Superior sand
First-class sand
3.2. 2 Particle size compositionwww.bzxz.net
3.2.2.1 The main particle size components of natural silica sand used in manufacturing: not less than 75% for three sieves, not less than 85% for four sieves, qualified sand
3.2.2.2 The absolute error of the fluctuation value of the main particle size components of the superior sand and first-class sand of the grade shall not be less than 5%. 3.2.2.3 The upper and lower sieve contents of each group of superior and first-class sand shall comply with the provisions of Table 3. Table 3
Sub-code
Upper sieve content
Test sieve number
Sum of sieves No. 2 and above
Sum of sieves No. 2 and above
Sum of sieves No. 3 and above
No. 4 Sum of sieves No. 5 and above
Sum of sieves No. 6 and above
Sum of sieves No. 7 and above
Quantity, %
Test sieve sequence
Sum of sieves No. 8 and below
Sum of sieves No. 8 and below
Sum of sieves No. 9 and below
Sum of sieves No. 9 and below
Sum of sieves No. 10 and below
Sum of sieves No. 10 and below
Sum of sieves No. 11 and below
3.3 The moisture content of superior sand and sand packaged in bags shall not exceed 0.3%, and other silica sands shall comply with the provisions of GB/T9442. 4 Test methods
4.1 The sampling methods for various tests on natural silica sand for manufacturing shall be carried out in accordance with the provisions of Chapter 1 of GB/T2684-1981. 4.2 The determination of silicon dioxide (SiO2) content in natural silica sand for casting shall be carried out in accordance with the provisions of Chapter 5 of GB/T7143-1986. 4.3 The determination of mud content and water content in natural silica sand for casting shall be carried out in accordance with the provisions of Chapter 2 of GB/T2684--1981. 4.4 The particle size composition of natural silica sand to be used for casting shall be analyzed by JB/T9156, and the analysis method of particle size composition shall be carried out in accordance with the provisions of 2.3 of G3/T2684--1981.
5 Evaluation method
All grades of natural silica sand for casting must fully meet the corresponding grade indicators. If one item does not meet the specified indicators, it can be re-tested. If the re-test results still do not meet the requirements, the grade of natural silica sand for casting shall be reduced. 598
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