This standard specifies the principle, equipment, specimens, test procedures, result calculation and test report of the high temperature flexural strength test method for refractory materials. This method is mainly used for shaped fired refractory products. Chemically bonded refractory products or amorphous refractory materials usually need to be pretreated. The pretreatment conditions must be negotiated by the relevant parties and stated in the test report. GB/T 3002-2004 High temperature flexural strength test method for refractory materials GB/T3002-2004 standard download decompression password: www.bzxz.net

TC5 81. 080
National Standard of the People's Republic of China
GB/T3002-—2004
Generation #GB/TH002—13A2.GI/T13213—Refractory MaterialsWww.bzxZ.net
Test Method for High-Temperature Flexural Strength
Refractoxy prductsDetermination of mndulus of rupture at clevuted temperaturesS)5013:198,MOD)
2004-06-09 Issued
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Standardization Administration of China
2004-12-01 Implementation
This standard is a revision of the standard (B/TH(H2-[82 fire products high temperature strength test method [05923:19850 fire products high benefit strength test method English version]). The main technical differences between this standard and SO0 are as follows:||tt =.2.2 More detailed requirements for the test furnace: 8.2 Added the provisions on the number of reserved numbers for calculation. The main technical differences between this standard and the original GB/130021S82 are as follows: 1. Expanded the scope of application:
Added the use standard;
The distance between the support mouths is changed:
Added the requirements for test protection:
The sample size is changed:
2. Modified the provisions on the number of reserved numbers for calculation results: The test control items are specified. Appendix A of the standard is a sample list.
GD/T 3C02—2004
This standard replaces GB/T50C2-1824 Test method for high temperature flexural strength of refractory products and GB/T1324319913 Test method for high temperature flexural strength of metal particles. This standard is proposed by Shanghai Steel Industry Association
This standard is approved by the National Refractory Standardization Technical Committee. The responsible drafting unit of this standard is Yuyang Refractory Material Research Institute, the participating unit of this standard is Fannan Kongcai Mijin Gaolu Prefabricated Refractory Material Factory, the main contributors of this standard are: Zhu Xiuquan, Yingxi Gao, Xianfacan, Yang Yuanjiu, the standard replaced by this standard is: CB/T30U3 first issued in 1982| |tt||F5/T13243 First published in 1991
1 Scope
Test method for high temperature flexural strength of refractory materials GD/T3002—2004
This standard specifies the principle, equipment, test procedures, test report, etc. of the high temperature flexural strength test method for refractory materials.
This method is mainly applicable to fixed-shape refractory products and refractory products or amorphous refractory materials. It is usually necessary to undergo spot treatment and pre-treatment through consultation with relevant parties and shall be noted in the test report. 2 Normative references
The following textual clauses become the versions of this standard through reference in this standard. Please pay special attention to the referenced documents with a date of production: All modifications (including errors or revisions) made after this standard are not applicable to this standard. However, all parties who have reached an agreement on this standard are encouraged to use the latest documents. For all documents with a production date of production, the latest version shall be used for this standard. GN/T317 Specification for numerical revisions
G/T10325 Acceptance criteria for shaped refractory products 3 Definitions
This standard adopts the following definitions:
Flexural strength modulusotrupture
It is a strip test property of refractory materials with a certain size. It is the maximum stress that can be withstood when subjected to bending on a 3-point triaxial device. 3.2
Test temperaturetest Temperalare
The temperature at the midpoint of the test surface (see 5.3) is the same as that of the test surface. 4 Principle
Heat the specimen to about the test temperature, and return it to the specified test distribution. Apply stress at a specified loading rate until the specimen breaks. 5 Equipment
5.1 Loading device
5.1.1 The loading device shall have two lower cutting edges and one upper cutting edge. The three cutting edges shall be parallel to each other. The distance between the lower cutting edges shall be 125 mm ± 2 mm: the upper cutting edge shall be placed between the two lower cutting edges, and the distance shall be ± 2 mm (see Figure 1). 1.
、Tension surface
Figure 1 Principle of bending device
GB/T3002—2004
5.1.2 The blade and the specimen shall not show any negative reaction when in contact at the test temperature. 5.1.3 The blade length shall be at least 5mm longer than the specimen. The curvature shall be (511) mm. The blade shall be checked regularly during use to ensure that its curvature meets the requirements. 5.1.4 The spacing between the two blades shall be measured accurately to 0.5mm at room temperature. 5.1.5 The test load shall be able to load the test piece and the specimen at a certain rate (see 7.2.2), and the test piece shall be able to record or record the fracture of the test piece. The accuracy shall be 2.5.2 Test furnace
5.2.1 The test furnace shall be able to heat the loading device and the specimen in time, and the test piece shall be evenly distributed on the specimen during the test. , the temperature difference should not exceed 5.2.2 For samples containing carbon and other easily oxidizable substances, the atmosphere around the sample in the test furnace should be either oxidative or reductive to protect the test sample from oxidation. After the test, the surface and section of the test sample should not have oxidative discoloration. To this end, one of the following measures should be taken! A gas-free test furnace should be filled with a protective gas of 1% non-toxic gas such as pure hydrogen or argon. The sample should be heated with a temperature of 100°. 5.9 Temperature measuring device 5.3.1 The temperature should be measured with a calibrated thermocouple near the tension point of the sample. 5.3.2 The relationship between the tension and the midpoint of the sample should be determined and the sample should be inspected regularly according to the sequence listed in Table A. 5.3.3 The midpoint of the sample should be kept at the test temperature during the inspection. 6 Samples 5.1 Quantity
6.1.1 The inspection and sampling of samples of shaped refractory products shall be carried out in accordance with GB/T:032>, or in accordance with the number or number agreed by both parties. 6.1.2 For unshaped refractory materials, each sample shall be no less than 3: 6.2 Shape and size
6.2.1 Under normal circumstances, the test piece shall be a long body with a cross-section of (25±1) mm×(25±1) mm. The length is 150 mm. The opposite faces of each sample in the length direction shall be perpendicular and parallel, with an allowable deviation of no more than 0.2 mm. If necessary, the opposite sides shall be parallel and the allowable deviation shall not exceed 0.2 mm. 0.1mm, the surface of the sample should be smooth and the core angle should be complete. If only other sizes of samples are used, the size changes should be carried out according to the interval of 5 twists,
foreign:, 1 The formula given is only valid for long case-shaped samples. The ratio of sample height to grams is changed by comparing the sample height to the support edge. The position is divided into n/t1/3, A:1.*31/4,
6.2.2 The size of the shaped fire fast particles can be (40±7)m×(4-2mm×160mm6.2.3 Use a vernier caliper to measure the length and width of the middle of the sample at room temperature. Accurate to 10.! mm, 6.3 Sample preparation || tt || 6.31 For the sample cut from the unshaped product, if the product has been pressed, the original surface of the sample should be marked directly below the original surface, and the other surface should be marked with the original surface. Note: The continuous surface is the first surface of the sample. If the tooth-shaped convex piece is used, the edge of the five-piece mountain is examined, and the surface of the entry is used as the standard surface. 6.3.2 For the unshaped refractory light test rails made by the mold, the side surface during molding is used as the sample pressure mountain. 6.3.3 In general, the test sample should be dried at (110 ± 5)°C to a constant temperature. For the conductive sample, it should be as wet as possible. The wet sample should be dried in a blast drying oven (110 ± 5)°C until the water content is constant. Or: For carbon-containing materials, the test sample should be dried in a blast drying oven (110 ± 5)°C to a constant temperature.
7.1 Heating
7.1.1 The test sample should be agreed upon by the parties, such as 162°C, 100°C. 132..). If necessary, the number of grids can be 2
, such as 105, 100r.1050....GB/T3002—2004
7.1.2 Put the sample in the furnace after heating, control the oxygen around the sample according to the material requirements, heat the sample to the test temperature +10, produce the rate (2--10)/min and the quality (4--6) C/min7,1,3 method to the test piece, keep the sample under this condition for a certain time, make the distribution and leakage of the sample not exceed 20, the holding time should be noted in the test report. 7.1.4 For the sintered refractory material, the holding time is 30m. For the finished product or amorphous fire village, the pretreatment should be agreed with the relevant parties during the holding time.
7.1.5 The passive temperature measured by the thermocouple located near the center of the pressure surface of the specimen shall not exceed ±2°C during the test. 7.2 Loading
7.2.1 Place the specimen on the lower surface: 7.2.2 Make the upper surface of the specimen straight and evenly distributed, and the rate of increase of stress from fracture to failure shall meet the following requirements: For refractory products, (C,: 5±0.U15) MPe/s; for thermal energy refractory products: .0,005) MPa/s.
7.2.3 Record the maximum load during the test: F.). 8 Calculation of results 8.1 Calculate the flexural strength according to the following formula: Flexural strength, in megabars (MP): 3xa
F--Total maximum load during the test, in Newton (N); -Bearing width, in mm: 6-Width of specimen, in meters (mm); Height of specimen, in mm. 8.2 The results are rounded off to one decimal place according to GB/T 517c. 9 Test report or acceptance report shall include: Test name
-Specimen name and number:
Test quantity,
Test duration (min)
Test condition (see 1.3 for details): -Specimen size (m)
| Position of the specimen on the test piece:
Deflection coefficient of the support (mm)
Temperature rate (/min);
- Overall air efficiency (see 1.2)
(s):
- Single and average values ​​of the expansion strength.
GR/T3Q02—2004
(Normative data)
Measurement of the temperature distribution of the specimen
4.1 Preliminary measurements shall be carried out at each test temperature to determine: a) the temperature distribution on the specimen;
6) the time required for the temperature distribution of the specimen to reach the specified uniformity (see 3.2.1 and 3.1.3);
- The relationship between the test temperature at equilibrium and the surface temperature of the midpoint of the specimen tension surface (see 5.3.2). A.2 These data are determined under the test strip using test thermocouples, lamp thermocouples and special specimens with holes drilled through them for the heating elements. The type should be the same as the specimen size (see G.2) and have similar thermal conductivity. A.3 For each new test furnace and each change in test conditions (e.g. replacement of heating elements or test thermocouples), measurements should be made.
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