YB/T 4035-1991 Silicon nitride bonded silicon carbide brick for blast furnace
2023-12-12
Silicon nitride bonded silicon carbide brick for blast furnace
1 Subject content and scope of application
This standard specifies the external dimensions, technical requirements, test methods, inspection rules, marking, packaging, transportation, and storage requirements for silicon nitride bonded silicon carbide bricks for blast furnaces.
This standard applies to silicon nitride bonded silicon carbide bricks for blast furnaces.
The code for silicon nitride bonded silicon carbide bricks for blast furnaces is DTZ 。
2Referenced standards
GB 2278 Shapes and dimensions of bricks for blast furnaces and hot blast stoves
GB 2997 Test methods for apparent porosity, water absorption, bulk density and true porosity of dense shaped refractory products
GB 3002 Test method for high temperature flexural strength of refractory products
GB 5072 Test method for compressive strength at room temperature of dense shaped refractory products
GB 10325 Rules for stacking, sampling, acceptance, storage and transportation of refractory products
GB 10326 Inspection methods for dimensions, appearance and section of refractory products
3 Shape and dimensions
3.1 The shape and dimensions of standard products for blast furnaces shall conform to GB 2278 。
3.2 The shape and dimensions of non-standard products for blast furnaces are processed according to the drawings of the demander.
4 Technical requirements
4.1 The physicochemical indicators of the products shall conform to Table 1 。
Table 1 | |||
Item | Index | ||
DTZ-1 | DTZ-2 | ||
Apparent porosity,% Not more than | 17 | 19 | |
Bulk density, g/cm 3 | Not less than | 2.62 | 2.58 |
Compressive strength at room temperature, MPa Not less than | 150 | 147 | |
High temperature flexural strength (1400℃), MPa Not less than | 43.0 | 39.2 | |
SiC,% Not less than | 72 | 70 | |
Si 3 N 4 %, Not less than | 21 | 20 | |
Fe 2 O 3 %, Not more than | 1.5 | 2.0 | |
4.2 The allowable deviation of dimensions and appearance requirements for non-standard products for blast furnaces shall be agreed upon by both the supplier and the demander. | |||
Table 2 mm | |||
Item | Index | ||
DTZ-1 | DTZ-2 | ||
Allowable deviation of dimensions | Length | ±2 | ±2 |
Width | ±1.5 | ±2 | |
Thickness | +1.0 -1.5 | ±1.5 | |
Twist | Length ≤230 Not more than | 1.5 | 1.5 |
Length 231~350 Not more than | 2 | 2 | |
Crack length | Width <0.25 | Unrestricted | Unrestricted |
Width 0.26~0.50 | 15 | 15 | |
Width >0.50 | Not allowed | Not allowed | |
Depth of chipped edges and corners | 5 | 5 | |
Diameter of slag hole | 5 | 5 | |
Slag erosion | Not allowed | Not allowed | |
5 Test methods
5.1 The determination of apparent porosity shall be carried out according to the provisions of GB 2997.
5.2 The determination of bulk density shall be carried out according to the provisions of GB 2997.
5.3 The determination of compressive strength at room temperature shall be carried out according to the provisions of GB 5072.
5.4 The determination of high temperature flexural strength shall be carried out according to the provisions of GB 3002.
5.5 Chemical analysis shall be carried out according to the provisions of Appendix A of this standard.
5.6 Inspection of dimensions, appearance and section shall be carried out according to the provisions of GB 10326.
6 Inspection rules
6.1 Product sampling and acceptance shall be carried out according to the provisions of GB 10325.
7 Marking, packaging, transportation, storage
7.1 The packaging box surface shall clearly indicate: product name, specifications, thickness positive and negative tolerance, quantity, manufacturer's name, date of manufacture, etc.
7.2 Products shall be packed according to the positive and negative tolerance of thickness upon leaving the factory, and packaging, transportation and storage shall be carried out according to GB 10325.
Silicon nitride bonded silicon carbide brick for blast furnace
1Subject content and scope of application
This standard specifies the dimensions, technical requirements, test methods, inspection rules and marks, packaging, transportation and storage requirements of silicon nitride bonded silicon carbide bricks used in blast furnaces.
This standard is suitable for high-envy silicon nitride combined with silicon carbide conversion.
The code of silicon nitride bonded silicon carbide brick in blast furnace is denoted by DTZ.
2 Reference Standards
GB 2278 Bricks for blast furnaces and hot blast furnaces
GB 2997 Test method for apparent porosity, water absorption, bulk density and true porosity of compact shaped refractory products
GB 3002 Test method for high temperature bending strength of refractory products
GB 5072 compact shaped refractory products test method for room temperature pressure resistance
GB 10325 Rules for stacking, sampling, acceptance, storage and transportation of refractory products
GB 10326 refractory products size, appearance and section inspection method
3 Shape and size
3.1 The shape and size of the standard type products for blast furnaces shall comply with the provisions of GB 2278.
3.2 The shape and size of non-standard products for blast furnaces shall be processed according to the drawing of the demander.
4 Technical Requirements
4.1 The physical and chemical indexes of the product shall comply with the provisions of Table 1.
Table 1 | |||
Item | Index | ||
DTZ-1 | DTZ-2 | ||
Apparent porosity，% No less than | 17 | 19 | |
Bulk density，g/cm 3 | No less than | 2.62 | 2.58 |
Compressive strength at room temperature/MPa， No less than | 150 | 147 | |
High temperature bending strength(1400℃)，MPa No less than | 43.0 | 39.2 | |
SiC,% No less than | 72 | 70 | |
Si 3 N 4 %,% No less than | 21 | 20 | |
Fe 2 O 3 %,% Not more than | 1.5 | 2.0 | |
4.2 The size permissible deviation and appearance requirements of non-standard type products for blast furnaces shall be agreed by both parties. 4.3 The permissible size deviation and appearance of standard model products for blast furnaces shall comply with the provisions of Table 2. | |||
Table 2 mm | |||
Item | Index | ||
DTZ-1 | DTZ-2 | ||
Allowable deviation of dimension | Length | ±2 | ±2 |
Breadth | ±1.5 | ±2 | |
Thickness | +1.0 -1.5 | ±1.5 | |
Contort | Length≤230 Not more than | 1.5 | 1.5 |
Length231~350 Not more than | 2 | 2 | |
Crack length | Breadth<0.25 | No limit | No limit |
Breadth 0.26~0.50 | 15 | 15 | |
Breadth>0.50 | Be forbidden from | Be forbidden from | |
Missing edge, missing Angle depth | 5 | 5 | |
Hole diameter | 5 | 5 | |
Slagging | Be forbidden from | Be forbidden from | |
5 Test methods
5.1 The apparent porosity was determined in accordance with GB 2997.
5.2 Measurement of bulk density shall be carried out in accordance with GB 2997.
5.3 The determination of compressive strength at room temperature shall be carried out in accordance with the provisions of GB 5072.
5.4 The determination of high temperature flexural strength shall be carried out according to the provisions of GB 3002.
5.5 Chemical analysis shall be carried out in accordance with Appendix A of this standard.
5.6 The inspection of dimensions, appearance and section shall be carried out according to the provisions of GB 10326.
6 Inspection Rules
6.1 Product sampling and acceptance shall be carried out according to GB 10325.
7 Marking, packaging, transportation, storage
7.1 Clearly marked on the surface of the packing box: product name, specification, thickness tolerance, quantity, manufacturer name, factory date and other marks.
7.2 The products are respectively packed according to the positive and negative tolerance of thickness, and the packaging, transportation and storage are carried out according to the provisions of GB 10325.
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