This standard specifies the classification, shape and size, technical requirements, test methods, inspection rules, packaging, marking, transportation, storage and quality certificate of high alumina bricks. This standard applies to general-purpose high alumina bricks with a unit weight of no more than 18kg. GB/T 2988-2004 High Alumina Bricks GB/T2988-2004 Standard download decompression password: www.bzxz.net

3—1987 "High Alumina Brick".
This standard replaces the revision of GB/T2988
8—1987 "High Alumina Brick". This standard is a revision of GB/T2988-
This standard is different from the previous version as follows: - Added high alumina brick IZ-80 grade;
Refractoriness requirements were deleted from the physical and chemical indicators; - Tightened the allowable deviation of brick size;
Increased the requirements for the relative thickness difference of bricks; Increased the requirements for the wedge difference of bricks.
This standard was proposed by the China Iron and Steel Association. This standard is under the jurisdiction of the National Technical Committee for Standardization of Refractory Materials. GB/T2988—2004
This standard was drafted by: Tangshan Iron and Steel Refractory Materials Co., Ltd., Luoyang Refractory Materials Group Co., Ltd., Zhengzhou Yuhua Enterprise Co., Ltd.
The main drafters of this standard are: Song Limin, Liu Aiguo, Du Wenzhong, Fang Zhengguo, Zhang Xicheng, Hou Junjie. The previous versions of the standards replaced by this standard are: -GB 2988-1982. GB/T 2988-1987; YB 398---1963.
1 Scope
High alumina bricks
GB/T 2988-2004
This standard specifies the classification, shape and size, technical requirements, test methods, inspection rules, packaging, marking, transportation, storage and quality certificate of high alumina bricks.
This standard applies to general-purpose high alumina bricks with a unit weight of no more than 18 kg. 2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties to an agreement based on this standard are encouraged to investigate whether the latest versions of these documents can be used. For any undated referenced document, the latest version applies to this standard. GB/T2992 Shapes and dimensions of general refractory bricks
GB/T2997-2000 Test method for bulk density, apparent porosity and true porosity of dense shaped refractory products GB/T5072 Test method for compressive strength of dense shaped refractory products at room temperature GB/T5988 Test method for linear change of dense shaped refractory products after reburning GB/T6900.4-1986 Chemical analysis methods for clay and high-alumina refractories Determination of alumina content by EDTA titration GB/T7321 Preparation method for sample of shaped refractory products GB/T 10324
Definition of classification of refractory products
GB/T10325—2001 Rules for sampling and acceptance of shaped refractory products Inspection of size, appearance and section of shaped refractory productsGB/T10326—2001
GB/T16546-1996 Packaging, marking, transportation and storage of shaped refractory productsYB/T370-1995 Test method for softening temperature under load of refractory products (non-differential-heating method)3 Classification and shape and size
3.1 Bricks are divided into five grades according to physical and chemical indicators: IZ-80, LZ-75, LZ-65, LZ-55, and LZ-48. 3.2 The shape and size of bricks shall comply with the provisions of GB/T2992, and can also be produced according to the drawings provided by the demander. 3.3 The classification of bricks shall comply with the provisions of GB/T10324. 4 Technical requirements
4.1 The physical and chemical indicators of bricks shall comply with the provisions of Table 1. 4.2 The allowable deviation of the size and appearance of bricks shall comply with the provisions of Table 2. 4.3 The cross-sectional cracking of bricks shall comply with the numerical provisions of cracks in Table 2. Table 1 Physical and chemical indicators of high alumina bricks
w(Ai203)/%
Apparent porosity/%
Compressive strength at room temperature/MPa
0.2MPaLoad softening starting temperature/℃
Change of permanent line after heating/%
Not less than
Not greater than
Not less than
Not less than
1500℃×2h
1450℃X2h
0. 1～—0. 4
0. 1~ -- 0. 4
GB/T2988—2004
Allowable size deviation.
Relative deviation of thickness
Difference in modulus
Length of missing corner (a+b+c)
Length of missing edge (e+f+g)
Diameter of melting hole
Length of crack
Table 2 Permissible deviation and appearance of brick size
Size ≤150
Size 151～300
Size>300
Length ≤300
Length>300
Width ≤0.25
Width 0.260.5
Width 0.5
According to user needs, one of the main dimensions of the brick can be graded. 5
Test method
The inspection and sample preparation of bricks shall be carried out in accordance with GB/T7321. 5.1
The determination of A12O: shall be carried out in accordance with GB/T6900.4-1986. 5.2bzxZ.net
The test of apparent porosity shall be carried out in accordance with GB/T2997-2000. 5.3
The test of compressive strength at room temperature shall be carried out in accordance with GB/T 5072. The test of the load softening starting temperature shall be carried out in accordance with YB/T370-1995. The test of the permanent linear change of heating shall be carried out in accordance with GB/T5988. The test of the size, appearance and cross-section of bricks shall be carried out in accordance with GB/T103266-2001.
Inspection rules
Not more than
Unit is mm
No restriction
No
The sampling and acceptance of bricks shall be carried out in accordance with GB/T10325-2001. The allowable deviation of the test results of the sample during retesting shall comply with the provisions of the second column of Table 3.
Table 3 Allowable deviation and standard deviation of test results Item Date
(Al,0.)/%
Apparent porosity/%
Compressive strength at room temperature/MPa
Softening under load start temperature/℃
Allowable deviation
Standard deviation.
When sampling acceptance is adopted in Appendix A5.3 of GB/T10325-2001, the values ​​in Table 1 are the guaranteed average values ​​(μc), and their standard deviations are given in the third column of Table 6.2
3.
6.3 The physical test acceptance items recommended by this standard are: porosity, softening under load start temperature, and compressive strength at room temperature. 2
7 Packaging, transportation, storage, marking and quality certification 7.1 The packaging, transportation and storage of bricks shall be carried out in accordance with GB/T165466-1996.
GB/T2988--2004
7.2 When bricks are shipped, they shall be accompanied by a quality certificate issued by the supplier's quality supervision department, stating: supplier name, buyer name, shipping date, product name, standard number, brand, brick number, batch number and corresponding physical and chemical indicators.
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