This standard specifies the product classification, technical requirements, test methods, inspection rules, marking and packaging requirements of high-aluminum thermal insulation refractory products for resistance furnaces. This standard is applicable to products whose working temperature is lower than the load softening start temperature of each variety. JB/T 3649.4-1994 Refractory products for resistance furnaces High-aluminum thermal insulation refractory products JB/T3649.4-1994 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T3649.4
1994-12-09
JB/T3649.41994
JB3649.41984
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking and packaging requirements of aluminum heat-insulating refractory products for electrical insulation (hereinafter referred to as products).
This standard is used for products whose working temperature is lower than the load softening start temperature of each variety. Cited standards
GB2992
GB2998
GB3995bzxZ.net
GB 3997.1
GB5989
CB5990
Shape and size of general fire bricks
Test method for bulk density and true porosity of shaped heat insulating refractory products High alumina heat insulating refractory bricks
Test method for line change of shaped heat insulating refractory products after reburning Test method for compressive strength of shaped heat insulating refractory products under temperature Test method for softening temperature under load of dense shaped refractory products Test method for thermal conductivity of shaped heat insulating refractory products (hot wire method) GB 6900. 1--6900,4
Chemical analysis methods for clay and high-alumina refractory materials GB7321
GB10325
G310326
I1/T 3646. 1
3Product classification
3.1 Variety specifications
Specialization of dense shaped refractory products Sample preparation regulations for testing refractory products Stacking, sampling, acceptance, storage and transportation rules for refractory products Dimensions of refractory products. Inspection methods for external gauges and cross-sections Test methods for refractory products for electrical insulation Thermal stability of shaped heat-insulating refractory products Products are divided into RLG-1.0, RLG-0.8, RLG-0.6 and RLG0.4 varieties according to density. 3.2 The shape and size of the product shall comply with the provisions of GB2992. Products not currently specified can be manufactured according to the required drawings. 3.3 The model of the product shall be compiled according to the following provisions, and the density shall be the main parameter in the model. The model of the product consists of the following parts: RL
Enterprise code
Technical level code, "or Ⅱ
Indicates product density, g/cm
…Indicates thermal insulation products
Indicates high aluminum
3.4 ​​Products are divided into ! and 1 levels according to the allowable size deviation and appearance. 3.5 The classification of products shall be in accordance with Article 1.3 of B3995. 41
The physical and chemical indicators of the product shall comply with the provisions of Table 1. Key
1994-12-09 Tumor
Indicates for resistance furnace
1995-06-01 Small cable
4 Technical requirements
Density/cr\
0. 1 MPaLoad training start
Temperature ℃, 2
Test line change
Time h
Thermal shock heat resistance, 2
Compressive strength at room temperature, MPa,
Thermal conductivity
Average temperature,
W/(m·K)s
1.0±0.05
JB/T3649.4
0.8±0.05
350±10
0. 6±0.04
0. 4± 0. 04
The thermal conductivity and thermal stability of the products shall be measured, and the results shall be indicated in the product certificate, but shall not be used as a delivery acceptance condition. 4.2
4.3 Permissible dimensional deviation and appearance requirements of products: a.
Processed products shall comply with the provisions of Table 2;
Unprocessed products shall comply with the provisions of Table 2 in GB3995. Table 2
Permissible dimensional deviation
Missing\
Weave length"
Dimension length
Missing" depth
Length (one floor).%
Weave width
>100~250
>250~400
≥250~400
>0. 25 ~0. 50
>0. 50~1, 00
Agreed by both parties
Agreed by both parties
No restrictions (not difficult to form a network)
No
JB/T3649.4
Note, 1) The missing corners and missing cores cannot exceed two on the same workpiece surface, 2) The same crack cannot span two oranges,
4.4 The fracture and delamination of the product shall comply with the provisions of Table 3. Table 3
Sectional delamination degree
>0.502.00
4. 5 The product should not have melting.
Section layer length
Wood limit
$20 (for RLG-0.4, ≤50)
≤30 (for RLG-0.4, ≤60)
Not allowed
4.6 The product should not have cavities with a hole diameter greater than 10mm. 5 Test method
5.1 The sampling of products shall be in accordance with the provisions of Chapter 3 of GB10325. For each batch of products, 10 pieces shall be taken for physical and chemical inspection, and 10 pieces shall be taken for appearance inspection. 5.2 The cutting of product samples shall be in accordance with the provisions of GB7321. 5.3 Chemical analysis shall be in accordance with the provisions of GB6900.1~6900.3. 5.4 Density inspection shall be in accordance with the provisions of GB2998. 5.5 The inspection of load softening temperature shall be in accordance with the provisions of GB5889, but the load shall be changed from 0.2MPa to 0.1MPa. After each sampling, the sample density must be retested and the test record must be filled in.
5.6 The inspection of reburning line change shall be in accordance with GB 3997.1. 5.7 The inspection of thermal shock stability shall be in accordance with JB/T3648.1. The inspection of room temperature compressive strength shall be in accordance with GB3997.2. 5. 8
5.9 The determination of thermal conductivity shall be in accordance with GB5990. 5.10 The inspection of the appearance, size and section of the product shall be in accordance with GB10326. 6 Inspection rules
6.1 The inspection rules of products shall be in accordance with the provisions of Chapter 4 of GB3995 (LG to RLG). Each batch of products (including small batches) shall be accompanied by a product certificate when it is shipped. 6. 2
Marking, packaging, transportation and storage
Product marking shall include the following items:
Manufacturer name;
Product name and model:
Product weight
Technical level marking:
e. Trademark;
, manufacturing date or batch number.
7.2 Packaging
According to Article 5.2 of GB3995.
7.3 Transportation
According to Article 5.3 of GB3995.
According to Article 5.4 of GB3995.
Additional instructions,
JB/T3649.4
This standard is proposed by the National Technical Committee for Standardization of Industrial Electric Heating Equipment. This standard is under the jurisdiction of Xi'an Electric Furnace Research Institute of the Ministry of Machinery Industry, and is drafted by Xi'an Electric Protection Research Institute, Shanghai Electric Furnace Refractory Material Factory, Yixing Chuanbu Refractory Electric Porcelain Factory No. 2, and Dongtai Refractory Equipment Factory.
The main drafters of this standard are Pu Wenxiu, Zhu Suyuan, Wang Jusen, Shao Xibin, and Ying Shengcai. 4
Xin Kui Lu
JB/T3649.4
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