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GB/T 2684-2025: Test methods for foundry sands and molding mixtures
Status: Valid GB/T 2684: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 2684-2025 | English | 519 |
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Test methods for foundry sands and molding mixtures
| Valid |
GB/T 2684-2025
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| GB/T 2684-2009 | English | 419 |
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Test methods for foundry sands and molding mixtures
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GB/T 2684-2009
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| GB/T 2684-1981 | English | 359 |
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Foundry sands and sand mixtures for casting--Method of testing
| Obsolete |
GB/T 2684-1981
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PDF similar to GB/T 2684-2025
Basic data | Standard ID | GB/T 2684-2025 (GB/T2684-2025) | | Description (Translated English) | Test methods for foundry sands and molding mixtures | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J31 | | Classification of International Standard | 77.180 | | Word Count Estimation | 26,220 | | Date of Issue | 2025-03-28 | | Date of Implementation | 10/1/2025 | | Older Standard (superseded by this standard) | GB/T 2684-2009 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 2684-2025: Test methods for foundry sands and molding mixtures---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 77.180
CCSJ31
National Standard of the People's Republic of China
Replaces GB/T 2684-2009
Test methods for foundry sands and mixtures
Released on 2025-03-28
2025-10-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Table of contents
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Sample selection 1
5 Test methods for foundry sand 2
6 Mixture test methods 9
Appendix A (Normative) Calculation method for average fineness of foundry sand 18
Figure 1 Schematic diagram of the siphon position of the sand washing cup 3
Figure 2 Schematic diagram of dry dynamic image particle size and shape analyzer equipment 8
Figure 3 Cylindrical standard specimen 12
Figure 4 "8" shaped standard specimen 12
Figure 5 Long strip standard specimen 13
Figure 6 Standard sample of coated sand in the shape of figure 8 13
Figure 7 Schematic diagram of compressive strength test device 13
Figure 8 Schematic diagram of shear strength test device 14
Figure 9 Schematic diagram of tensile strength test specimen device 14
Figure 10 Schematic diagram of bending strength test device 14
Figure 11 Schematic diagram of the special sample tube for hot and wet tensile strength tester 15
Figure 12 Schematic diagram of hot and wet tensile strength tester 15
Figure 13 Standard sample tube 17
Table 1 Moisture tolerance 3
Table 2 Standing time at different water temperatures
Table 3 Allowable difference of mud content 4
Table 4 Comparison table of casting test sieve models, sieve numbers and sieve hole sizes 5
Table 5 Permissible difference between laboratories under different loss on ignition conditions 7
Table 6 Test temperature of different sand samples 16
Table A.1 Fineness factors corresponding to different sieve numbers 18
Table A.2 Calculation example of average fineness 18
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document replaces GB/T 2684-2009 "Test methods for foundry sand and mixtures". Compared with GB/T 2684-2009, except for the structure
In addition to adjustments and editorial changes, the main technical changes are as follows.
a) The scope of application of the test methods for foundry sand and mixtures has been changed (see Chapter 1, Chapter 1 of the.2009 edition);
b) Added the terms and definitions of circularity and deleted the terms and definitions of foundry sand (see Chapter 3, Chapter 3 of the.2009 edition);
c) The accuracy requirements of the water content measuring device have been changed (see 5.1.2, 5.1.1 of the.2009 edition);
d) Added the allowable difference requirements for moisture content determination (see 5.1.6);
e) The mud content determination procedure requirements have been changed (see 5.2.4, 5.2.4 of the.2009 edition);
f) Added the allowable error requirements for mud content determination (see 5.2.6);
g) The determination method of acid consumption value has been changed (see 5.4, 5.8 of the.2009 edition);
h) The requirements for the loss on ignition determination procedure have been changed (see 5.5.3, 5.7.3 of the.2009 edition);
i) Added circularity determination method (see 5.6);
j) Added conductivity measurement method (see 5.7);
k) The specimen preparation in strength determination has been changed (see 6.6.3, 5.6.2 of the.2009 edition);
l) Added the method for determining fluidity (see 6.8).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document is proposed and coordinated by the National Casting Standardization Technical Committee (SAC/TC54).
This document was drafted by. Jinan Shengquan Group Co., Ltd., Wuxi Sanfeng Instrument Equipment Co., Ltd., Suzhou Xingye Materials Technology
Co., Ltd., Tongliao Dalin Molding Sand Co., Ltd., Shandong Heavy Equipment Testing Technology Co., Ltd., China Machinery General Academy Group Shenyang Foundry
Research Institute Co., Ltd., Chengde Dongwei New Materials Technology Co., Ltd., Guangdong Zhuli Casting Technology Co., Ltd., Chongqing Changjiang Modeling Materials
(Group) Co., Ltd., Guangxi Lanke Resources Recycling Co., Ltd., Huazhong University of Science and Technology, Hohai University, Zhejiang Mechanical and Electrical Vocational Technical University
University of Science and Technology, Shenyang University of Technology, Wuhan University of Technology, Tongling University, Zhengzhou Xiangyu Casting Materials Co., Ltd., Baotou Zhuyou Industrial Materials Co., Ltd.
Hebei Shenghuo New Materials Technology Co., Ltd., Jinnaiyuan (Henan) Industrial Technology Co., Ltd., Jinan Shengquan Casting Materials Co., Ltd., Hebei
Yitai Bearing Co., Ltd., Hubei Gucheng County Donghua Machinery Co., Ltd., Qufu Longxiang Metallurgical and Casting Auxiliary Materials Co., Ltd., Changzhou Juling Casting
Co., Ltd., Jiangsu Jinyang Machinery Co., Ltd., Liyang Wansheng Casting Co., Ltd., Shandong Lide Automobile Technology Co., Ltd., Changsha
Dicastal Technology Co., Ltd., Chiping Xinfa Aluminum Products Co., Ltd., AECC Harbin Dongan Engine Co., Ltd., CRRC Qishuyan Locomotive
Vehicle Technology Research Institute Co., Ltd. and Inner Mongolia First Machinery Group Co., Ltd.
The main drafters of this document are. Li Donghua, Li Na, Xue Jiang, Li Yuancai, Cheng Nan, Wang Jincheng, Su Ruifang, Liu Chunjing, Sun Pu, Li Dongyu, Deng Han,
Han Shengli, Wu Yuping, Wang Zehua, Liu Ye, Wang Lifeng, Liu Guomei, Kang Xiao, Zhang Yancheng, Kong Qu, Cui Lanfang, Wan Peng, Lu Jianhua, Li Zhimin, Zhu Xiang,
Liu Weihua, Wang Songlin, Tan Rui, Chen Kaimin, Li Jian, Chen Yihan, Xu Dongfang, Sha Jinyang, Liu Qinshuang, Liu Jun, Wang Yuming, Han Yongjun, Li Lufeng,
Liu Chuanbao, Ma Xinbiao, Li Yuan.
This document was first issued in 1981, revised for the first time in.2009, and this is the second revision.
Test methods for foundry sands and mixtures
1 Scope
This document describes the sampling of foundry sands and mixes, test methods for foundry sands and test methods for mixes.
This document is applicable to the determination of properties of foundry sand and mixtures.
2 Normative references
The contents of the following documents constitute essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 601 Preparation of standard titration solutions for chemical reagents
GB/T 603 Preparation of preparations and products used in chemical reagent test methods
GB/T 5611 Casting Terminology
GB/T 6682 Specifications and test methods for water used in analytical laboratories
JB/T 9156 Test sieves for casting
3 Terms and definitions
The terms and definitions defined in GB/T 5611 and the following apply to this document.
3.1
Mixture [molding mixture] moldingmixture
The material made by mixing casting sand, binder and other additives in a certain proportion meets the requirements of modeling (core making).
Note. Including clay sand, resin sand, water glass sand, etc.
3.2
circulardegree
Characterize the closeness of the particle projection to the circle to infer the roundness of the particle shape of the foundry sand.
4 Sample selection
4.1 The average sample of the same batch of raw sand for casting should be selected. The average sample of bulk raw sand is collected in train carriages, ship cabins, cars, sand storages and sand piles.
From the corners and the center of the sand.200mm~300mm away from the edge and surface, use a sampler to select; the average sample of 50kg bag of raw sand
The average sample of raw sand in bags of more than 1000 kg is selected from 1% of the bags in the same batch, but
There shall be no less than three bags, and the total weight shall not be less than 5kg (and the amount may be increased according to different test items).
If there is any doubt about the quality of a part of the raw sand, it should be sampled and tested separately, and the agglomerates (the aggregation of sand particles can be clearly seen) should not be selected.
And remove visible impurities.
4.2 Samples of recycled sand or regenerated sand may be regularly taken from the sand outlet of relevant equipment or from the conveyor, and the quantity shall be determined according to the inspection items.
4.3 Mixture samples should be collected regularly according to the characteristics of the mixing equipment and process requirements. If the mixture is transported by a belt conveyor, the samples can be collected from the conveyor.
Take three samples at regular intervals and mix them evenly. The number depends on the inspection items.
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