YB/T 4168-2019 Clay bricks and semi-silica bricks for coke ovens
2023-11-16
Clay bricks and semi-silica bricks for coke ovens
1 Scope
This standard specifies the classification, shape, size, technical requirements, test methods, quality evaluation procedures, packaging, marking, transportation, storage and quality certificates of clay bricks and semi-silica bricks for coke ovens.
This standard applies to clay bricks and semi-silica bricks for coke ovens, and can also be used for bricks used in carbon furnaces, gas generators and vertical furnace linings.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only the version cited applies. For undated references, the latest version (including all amendments) applies.
GB/T 2992.1 Shape and size of refractory bricks Part 1 Part : General bricks.
GB/T 2997 Test methods for bulk density, apparent porosity and true porosity of dense shaped refractory products.
GB/T 5072 Test method for compressive strength of refractory materials at room temperature.
GB/T 5988 Test method for permanent linear change of refractory materials after heating.
GB/T 6900 Chemical analysis method for aluminum silicate refractory materials.
GB/T 7321 Preparation method for shaped refractory product samples.
GB/T 7322 Test method for refractoriness of refractory materials.
GB/T 10325 Acceptance sampling inspection rules for shaped refractory products.
GB/T 10326 Inspection methods for dimensions, appearance and cross-section of shaped refractory products.
GB/T 16546 Packaging, marking, transportation and storage of shaped refractory products.
GB/T 21114 X-ray fluorescence spectrochemical analysis of refractory materials - Casting glass method.
YB/T 370 Test method for load softening temperature of refractory materials (non-differential-heating method).
3 Classification and dimensions
3.1 Clay bricks and semi-silica bricks for coke ovens are classified into two categories according to their use and physicochemical indicators: JNZ-35 and BGZ-65. Among them, JNZBG are the initials of "coke", "clay", "brick", "semi", and "silica" in Chinese Pinyin, and 35 and 65 respectively represent Al 2 O 3 and SiO 2) mass percentage content.
3.2 The shape and size of clay bricks and semi-silica bricks for coke ovens can be in accordance with GB/T 2992.1, or can be produced according to the drawings provided by the purchaser.
4 Technical requirements
4.1 The physicochemical indicators of clay bricks and semi-silica bricks for coke ovens shall conform to the provisions in Table 1.
Table 1 Physicochemical indicators of clay bricks and semi-silica bricks for coke ovens | ||||
Item | Specified value | |||
JNZ-35 | BGZ-65 | |||
w(SiO 2)/% | μ 0 | ≥ | – | 65 |
σ | – | 1.5 | ||
w(Al 2 O 3)/% | μ 0 | ≥35 | <30 | |
σ | 1.5 | 1.5 | ||
w(Fe 2 O 3)/% | μ 0 | ≤ | 2.5 | – |
σ | 0.5 | – | ||
Apparent porosity/% | μ 0 | ≤ | 24 | 24 |
σ | 2 | 2 | ||
Compressive strength at room temperature | μ 0 | ≥ | 30 | 30 |
σ | 10 | 10 | ||
0.2MPa Load softening starting temperature (T 0.6 )/℃ | μ 0 | ≥ | 1350 | 1350 |
σ | 15 | 15 | ||
Refractoriness/℃ | μ 0 | ≥ | 1680 | – |
σ | 15 | |||
Permanent linear change after heating (1350℃x2h)/% | -0.3~0 | -0.2~0 | ||
Note: Only the refractoriness of grid bricks is tested, and the load softening temperature is not considered. | ||||
4.2 The dimensional tolerances and appearance of clay bricks and semi-silica bricks for coke ovens shall conform to the provisions in Tables 2 and 3.
Table 2 Dimensional tolerances and appearance of clay bricks and semi-silica bricks for coke ovens Unit: mm | ||||
Item | Specified value | |||
Dimensional tolerance | Size ≤150 | -2~+1 | ||
Size 151~300 | ±2 | |||
Size >300 | Size ±1%, maximum ±4 | |||
Twist | Length ≤300 | ≤1.0 | ||
Length >300 | ≤2.0 | |||
Length of chipped corner (a+b+c) | ≥ | 40 | ||
Length of chipped edge (e+f+g) | 60 | |||
Number of chipped edges and corners | 3 | |||
Crack length | Width ≤0.10 | Unrestricted | ||
Width 0.11~0.25 | ≥ | 70 | ||
Width 0.26~0.50 | 40 | |||
Width > 0.50 | Not allowed | |||
Relative edge difference Thickness | ≥ | 1 | ||
Table 3 Melting holes and iron spots of clay bricks and semi-silicon bricks for coke ovens | |||||
Brick surface | Melting holes | Iron spots | |||
Diameter mm | Depth mm | Maximum allowable number of melting holes per 100cm² brick surface/pcs | Diameter mm | Maximum allowable number per 100cm² brick surface/pcs | |
Working surface | >3~≤5 >5~≤8 | ≤3 | 3 1 | >5~≤10 | 3 |
Other surfaces | >5~≤7 >7~≤10 | 3 1 | >5~≤15 | 3 | |
Calculated according to the actual area of each brick surface. | |||||
5 Test methods
5.1 Inspection sample preparation according to GB/T 7321.
5.2 Determination of chemical composition according to GB/T 6900 or GB/T 21114.
5.3 Determination of apparent porosity according to GB/T 2997.
5.4 Determination of normal temperature compressive strength according to GB/T 5072.
5.5 Determination of heating permanent linear change according to GB/T 5988.
5.6 Determination of load softening temperature according to YB/T 370.
5.7 Inspection of dimensions and appearance according to GB/T 10326.
5.8 Determination of refractoriness according to GB/T 7322.
6 Quality assessment procedures
6.1 Batching
Products are batched according to their use and production process, with each batch not exceeding 500t.
6.2 Sampling and acceptance criteria
6.2.1 The factory inspection items include all items in Table 1.
6.2.2 Sampling and acceptance of products shall be carried out according to GB/T 10325. Chemical composition, apparent porosity, normal temperature compressive strength, load softening temperature (excluding grid bricks) or refractoriness are acceptance inspection items.
6.3 Qualification assessment form
Qualification assessment can be carried out in the form of supplier's declaration, user's confirmation or third-party certification.
7 Packaging, marking, transportation, storage and quality certificate
7.1 Packaging, marking, transportation and storage of products shall be carried out according to GB/T 16546, and according to the contract if agreed upon.
7.2 Upon leaving the factory, the product shall be accompanied by a quality certificate issued by the supplier's quality supervision department, stating the supplier's name, purchaser's name, product name and grade, contract number, production date and physicochemical indicators, etc.
Clay and semi-silicon bricks for coke ovens
1 Range
This standard specifies the classification, shape and size, technical requirements, test methods, quality assessment procedures, packaging, marking, transportation, storage and quality certificates of clay and semi-silicon bricks used in coke ovens.
This standard is applicable to clay bricks and semi-silicon bricks for coke ovens, and can also be used for lining bricks for carbon furnaces, gas generators and vertical furnaces.
2 Normative reference documents
The following documents are essential for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all amendment orders) applies to this document.
GB/T 2992.1 Shape and dimensions of refractory bricks – Part 1: general purpose bricks.
Test method for bulk density, apparent porosity and true porosity of GB/T 2997 compact shaped refractory products.
GB/T 5072 refractories – normal temperature compressive strength test method.
GB/T 5988 refractory heating permanent line change test method.
GB/T 6900 aluminum-silicon refractory chemical analysis method.
GB/T 7321 shaped refractory product sample preparation method.
GB/T 7322 refractoriness test method.
GB/T 10325 shaped refractory products acceptance sampling inspection rules.
GB/T 10326 shaped refractory products size, appearance and section inspection method.
GB/T 16546 shaped refractory products packaging, marking, transportation and storage.
GB/T 21114 refractories X-ray fluorescence spectrochemical analysis cast glass sheet method.
Test method for softening temperature of YB/T 370 refractories under load (non-differential – rising temperature method).
3 Classification and shape size
3.1 Clay bricks and semi-silicon bricks for coke ovens are divided into JNZ-35 and BGZ-5 categories according to their use and physical and chemical indexes. JNZBG is the initial letter of “Jiao”, “sticky”, “brick”, “half” and “silicon” in Chinese pinyin, 35 and 65 respectively represent the mass percentage content of Al2O3 and SiO2).
3.2 The shape and size of clay bricks and semi-silicon bricks for coke oven can be made according to GB/T 2992.1, or according to the drawing requirements provided by the customer.
4 Technical Requirements
4.1 The physical and chemical properties of clay bricks and semi-silicon bricks used in coke ovens must comply with the provisions of Table 1.
Table 1 Physical and chemical properties of clay bricks and semi-silicon bricks used in coke ovens | ||||
Item | Rated value | |||
JNZ-35 | BGZ-65 | |||
w(SiO 2)/% | μ 0 | ≥ | – | 65 |
σ | – | 1.5 | ||
w(Al 2 O 3)/% | μ 0 | ≥35 | <30 | |
σ | 1.5 | 1.5 | ||
w(Fe 2 O 3)/% | μ 0 | ≤ | 2.5 | – |
σ | 0.5 | – | ||
Apparent porosity/% | μ 0 | ≤ | 24 | 24 |
σ | 2 | 2 | ||
Compressive strength at room temperature /MPa | μ 0 | ≥ | 30 | 30 |
σ | 10 | 10 | ||
0.2MPa load softening starting temperature (T 0.6 )/℃ | μ 0 | ≥ | 1350 | 1350 |
σ | 15 | 15 | ||
Refractoriness/℃ | μ 0 | ≥ | 1680 | – |
σ | 15 | |||
Heating permanent linear change (1350℃x2h)/% | -0.3~0 | -0.2~0 | ||
Note: Only check brick refractories; do not consider the load softening temperature. | ||||
4.2 The permissible size deviation and appearance of clay bricks and semi-silicon bricks used in coke ovens must comply with the provisions of Table 2 and Table 3.
Table 2 Permissible size deviation and appearance of clay bricks and semi-silicon bricks used in coke ovens unit: mm | ||||
Item | Rated value | |||
Permissible dimensional deviation | Dimension ≤150 | -2~+1 | ||
Dimension 151~300 | ±2 | |||
Dimension >300 | Dimension ±1%，Max ±4 | |||
Distortion | Length ≤300 | ≤1.0 | ||
Length300 | ≤2.0 | |||
Missing Angle length (a+b+c) | ≥ | 40 | ||
Missing edge length (e+f+g) | 60 | |||
Missing edges, missing angles | 3 | |||
Crack length | Breadth ≤0.10 | No limit | ||
Breadth 0.11~0.25 | ≥ | 70 | ||
Breadth 0.26~0.50 | 40 | |||
Breadth >0.50 | Prohibited | |||
Relative edge difference thickness | ≥ | 1 | ||
Table 3 Melting holes and iron spots of clay and semi-silicon bricks used in coke ovens | |||||
Brick face | Molten cavity | Iron speck | |||
Diameter mm | Depth mm | Maximum number of holes allowed per 100cm² brick surface | Diameter mm | Maximum number of bricks per 100cm² | |
Working face | >3~≤5 >5~≤8 | ≤3 | 3 1 | >5~≤10 | 3 |
Other side | >5~≤7 >7~≤10 | 3 1 | >5~≤15 | 3 | |
Convert according to the actual area of each brick surface. | |||||
5 Test methods
5.1 Test sample preparation must be carried out according to GB/T 7321.
5.2 Chemical composition is determined in GB/T 6900 or GB/T 21114.
5.3 Apparent porosity was measured according to GB/T 2997.
5.4 The compressive strength at room temperature must be measured according to GB/T 5072.
5.5 The determination of the permanent linear change of heating was performed according to GB/T 5988.
5.6 The load softening temperature was measured according to YB/T 370.
5.7 Size and appearance must be checked according to GB/T 10326.
5.8 Refractories must be measured according to GB/T 7322.
6 Quality assessment procedures
6.1 Batch Ordering
Products must be batched according to use and production process; the quantity of each batch must not exceed 500t.
6.2 Sampling and conformity determination rules
6.2.1 Factory inspection items include all items listed in Table 1.
6.2.2 Sampling and acceptance of products must be carried out according to GB/T 10325. Chemical composition, apparent porosity, normal temperature compressive strength, load softening temperature (excluding lattice bricks) or fire resistance are the acceptance test items.
6.3 Form of conformity assessment
Conformity assessment can be made in the form of the supplier’s declaration, the user’s certification or third-party certification.
7 Packing, marking, transportation, storage and quality certificate
7.1 The packaging, marking, transportation and storage of the products must be carried out in accordance with GB/T 16546, and must be carried out in accordance with the contract as stipulated in the contract.
7.2 The quality certificate issued by the quality supervision department of the supplier must be attached when the product leaves the factory, indicating the name of the supplier, the name of the demander, the name and brand of the product, the contract number, the production date and the physical and chemical index.
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