GB/T34188-2017 粘土质耐火砖/Clay refractory brick
粘土质耐火砖
1范围
本标准规定了粘土质耐火砖的术语和定义、分类、形状和尺寸、技术要求、试验方法、质量评定程序包装、标志、运输、储存及质量证明书。
本标准适用于高温窑炉用普通粘土砖、致密粘土砖、低蠕变粘土砖和抗热震粘土砖。
2规范性引用文件
下列文件对于本文件的应用是必不可少的。凡是注日期的引用文件,仅注日期的版本适用于本文件。凡是不注日期的引用文件,其最新版本(包括所有的修改单)适用于本文件.
GB/T 2992.1 耐火砖形状尺寸 第1部分:通用砖。
GB/T 2997致密定形耐火制品体积密度、显气孔率和真气孔率试验方法。
GB/T 3002高温抗折强度试验方法耐火材料。
GB/T 5072耐火材料常温耐压强度试验方法。
GB/T 5073耐火材料乐蠕变试验方法。
GB/T 5988耐火材料 加热永久线变化试验方法。
GB/T 6900铅硅系耐火材料化学分析方法。
GB/T 7321定形耐火制品试样制备方法。
GB/T 10325定形耐火制品验收抽样检验规则。
GB/T 10326定形耐火制品尺寸、外观及断面的检查方法。
GB/T 14983耐火材料 抗碱性试验方法。
GB/T 16546定形耐火制品包装、标志、运输和储存。
GB/T 21114耐火材料 X射线荧光光谱化学分析熔铸玻璃片法。
GB/T 30873 耐火材料 抗热震性试验方法。
YB/T 370 耐火制品荷重软化温度试验方法(非示差-升温法)。
YB/T 4198钢包用耐火砖形状尺寸。
YB/T 5012高炉及热风炉用耐火砖形状尺寸。
YB/T 5110浇铸用耐火砖形状尺寸。
YB/T 5113盛钢桶内铸钢用耐火砖形状尺寸。
3术语和定义
GB/T 10325 界定的以及下列术语和定义适用于本文件
3.1
普通粘土砖 fireclay refractory brick
以硬质粘土熟料为主要原料的烧成普通粘土制品。
3.2
致密粘土砖dense fireclay brick
显气孔率较低的烧成粘土制品。
3.3
低蠕变粘土砖 low creep fireclay refractory brick
蠕变率较低的烧成粘土制品。
抗热震粘土砖 thermal shock resistance fireclay brick
热震性能较好的烧成粘土制品。
4分类、形状和尺寸
4.1分类
4.1.1粘土质耐火砖分为普通粘土砖、致密粘土砖、低蠕变粘土砖和抗热震粘土砖四大类。
4.1.2普通粘土砖按理化指标分为:PN-42、PN-40、PN-35、PN-30、PN-25 五个牌号。牌号中P、N为普、粘的汉语拼音首字母,数字为三氧化二铝质量百分数。4.1.3致密粘土砖按理化指标分为:ZMN-45ZMN-42 ZMN-42L、ZMN-40ZMN-30 ZMN-25 六个牌号。牌号中 Z、M、N、L为致、密、粘、磷的汉语拼音首字母,数字为三氧化二铝质量分数。其中ZMN-42L为磷酸盐浸渍砖,ZMN-30、ZMN-25 为耐碱粘土砖。
4.1.4低蠕变粘土砖按理化指标分为:DRN-128A,DRN-128B、DRN-125、DRN-120、DRN-115,DRN-110.DRN-105 七个牌号。牌号中 D、R、N 为低、蟠、粘的汉语拼音首字母,数字为蠕变率试验温度的 1/10.数字后字母 A、B 为同一牌号不同等级要求的分级代号。4.1.5 抗热震粘土砖按理化指标分为:RZN-42、RZN-40 两个牌号。牌号中 R、Z、N 为热、震、粘的汉语拼音首字母,数字为三氧化二铝质量分数。
4.2形状和尺寸
砖的形状尺寸应符合GB/T 2992,1,YB/T 4198、YB/T 5012、YB/T 5110和YB/T 5113的规定也可按需方提供的图纸进行生产。
5技术要求
5.1普通粘土砖的理化指标应符合表1的规定。
5.2致密粘土砖的理化指标应符合表2的规定。
5.3低蠕变粘土砖的理化指标应符合表3的规定。
5.4抗热震粘土砖的理化指标应符合表4的规定。
5.5砖的尺寸允许偏差及外观要求应符合以下规定:
——通用砖的尺寸允许偏差及外观应符合表5的规定。
——其他特殊要求砖的尺寸允许偏差及外观由供需双方协商。
|
表1 普通粘土砖的理化指标 |
||||||
|
项目 |
指 标 |
|||||
|
PN-42 |
PN-40 |
PN-35 |
PN-30 |
PN-25 |
||
|
w(Al2O3)/% |
μ0≥ |
42 |
40 |
35 |
30 |
25 |
|
σ |
2.5 |
|||||
|
w(Fe2O3)/% |
μ0≤ |
2.0 |
– |
– |
– |
– |
|
σ |
|
0.4 |
|
|||
|
显气孔率/% |
μ0≤ |
20(22) |
24(26) |
26(28) |
23(25) |
21(23) |
|
σ |
2.0 |
|||||
|
常温耐压强度/MPa |
μ0≥ |
45(35) |
35(30) |
30(25) |
30(25) |
30(25) |
|
Xmin |
35(25) |
25(20) |
20(15) |
20(15) |
20(15) |
|
|
σ |
10 |
|||||
|
0.2MPa荷重软化温度T0.6/℃ |
μ0≥ |
1400 |
1 350 |
1320 |
1300 |
1250 |
|
σ |
|
13 |
|
|
||
|
加热永久线变化/% |
U-L |
1 400 ℃x2h -0.4~0.1 |
1350℃x2h -0.4~0.1 |
1300℃x2 h -0.4~0.1 |
1300℃x2h -0.4~0.1 |
1250 ℃x21 -0.4~0.1 |
|
注1:括号内数值为格子砖或特异型砖的指标。 |
||||||
|
表2致密粘土砖的理化指标 |
|||||||
|
项目 |
指 标 |
||||||
|
ZMN-45 |
ZMN-42 |
ZMN-42L |
ZMN-40 |
ZMN-30 |
ZMN-25 |
||
|
w(Al2O3)/% |
μ0≥ |
45 |
42 |
42 |
40 |
30 |
25 |
|
σ |
2.5 |
||||||
|
w(Fe2O3)/% |
μ0≤ |
1.2 |
1.5 |
1.8 |
1.7 |
1.6 |
2 |
|
σ |
0.4 |
||||||
|
w(P2O5)/% |
μ0≥ |
– |
– |
5 |
– |
– |
|
|
σ |
– |
– |
0.5 |
– |
– |
– |
|
|
显气孔率/% |
μ0≤ |
12(14) |
15(17) |
14 |
17(19) |
15 |
19 |
|
σ |
2 |
||||||
|
常温耐压强度/MPa |
μ0≥ |
70(60) |
65(55) |
70 |
55(45) |
70 |
50 |
|
Xmin |
60(50) |
55(45) |
60 |
45(35) |
60 |
40 |
|
|
σ |
10 |
||||||
|
0.2MPa荷重软化温度T0.6/℃ |
μ0≥ |
1 480 |
1 450 |
1 450 |
1 420 |
1 300 |
1 250 |
|
σ |
13 |
||||||
|
抗碱性(强度下降率)/% |
≤ |
– |
– |
15 |
– |
– |
一级 |
|
加热永久线变化/% |
U-L |
1 450 ℃x3 h -0.2~0.1 |
1450 ℃x3 h -0.2~0.1 |
1 450 ℃x3 h -0.2~0.1 |
1400 ℃x2 h |
1300℃x2 h -0.4~0.1 |
– |
|
注 1:括号内数值为格子砖或特异型砖的指标。 注3:抗热震性、体积密度根据用户要求提供检测数据。 |
|||||||
|
表3低蠕变粘土砖的理化指标 |
||||||||
|
项目 |
指 标 |
|||||||
|
DRN-128A |
DRN-128B |
DRN-125 |
DRN-120 |
DRN-115 |
DRL-110 |
DRL-105 |
||
|
w(Al2O3)/% |
μ0≥ |
45 |
45 |
45 |
42 |
40 |
36 |
32 |
|
σ |
2.5 |
|||||||
|
w(Fe2O3)/% |
μ0≤ |
1.5 |
1.8 |
1.5 |
1.8 |
1.9 |
2.0 |
2.0 |
|
σ |
|
|
|
0.4 |
|
|
||
|
显气孔率/% |
μ0≤ |
15(17) |
18(20) |
20(22) |
20(22) |
22(24) |
22(24) |
22(24) |
|
σ |
2 |
|||||||
|
常温耐压强度/MPa |
μ0≥ |
60(50) |
55(45) |
45(35) |
35(25) |
35(25) |
30(20) |
25(20) |
|
Xmin |
50(40) |
45(35) |
35(25) |
25(20) |
25(20) |
25(20) |
20(15) |
|
|
σ |
10 |
|||||||
|
高温抗折强度/MPa(1200℃,0.5h) |
μ0≥ |
6(5) |
5(4) |
|
|
|
|
|
|
蠕变率/%(0.2 MPa，50h) |
μ0≤ |
1280℃x25h |
1280℃X25 h |
1250℃ |
1200℃ |
1150 ℃ |
1100℃ |
1050℃ |
|
σ |
0.1 |
|||||||
|
加热永久线变化/% |
U-L |
1400℃x2h -0.3~0.1 |
1350℃x |
1300℃x2 h -0.4~0.1 |
||||
|
注 1:括号内为格子砖或特异型砖的指标。 注 3:抗热震性、体积密度根据用户要求提供检测数据。 |
||||||||
|
表4抗热震粘土砖的理化指标 |
||||
|
项目 |
指标 |
|||
|
RZN-42 |
RZN-40 |
|||
|
w(Al2O3)/% |
μ0≥ |
42 |
40 |
|
|
σ |
2.5 |
|||
|
w(Fe2O3)/% |
μ0≤ |
2.0 1.5 |
||
|
σ |
0.4 |
|||
|
σ |
13 |
|||
|
显气孔率/% |
μ0≤ |
20(22)16(18) |
||
|
σ |
2.0 |
|||
|
常温耐压强度/MPa |
μ0≥ |
40(35) |
70(55) |
|
|
Xmin |
35(30) |
55(50) |
||
|
σ |
10 |
|||
|
0.2MPa荷重软化温度T0.6/℃ |
μ0≥ |
1420 |
1450 |
|
|
σ |
13 |
|||
|
加热永久线变化/% |
U-L |
1450℃x2h -0.3~0.1 |
1350℃x2h -0.5~0.1 |
|
|
抗热震性/次(1100℃，水冷) |
≥ |
20 |
10 |
|
|
0.2MPa蠕变率/%(1250℃，50h) |
μ0≤ |
0.8 |
– |
|
|
σ |
0.1 |
– |
||
|
注1.括号内数值为格子砖及特异型砖的指标。 注3:体积密度根据用户要求提供检测数据。 |
||||
|
表5砖的尺寸允许偏差及外观(通用砖) 单位为毫米 |
||||||
|
项目 |
指 标 |
|||||
|
格子砖 |
其他砖 |
|||||
|
尺寸允许偏差 |
长度(宽度) |
+1 -3 |
尺寸≤150 |
±2 |
||
|
高度(厚度) |
±3 |
尺寸151~345 |
±3 |
|||
|
同一面上相邻孔的间距 |
±1 |
尺寸>345 |
±4 |
|||
|
扭曲 |
– |
尺寸≤345 |
≤ |
1.0 |
||
|
尺寸>345 |
1.5 |
|||||
|
缺角长度(a+b+c) |
≤ |
40 |
||||
|
缺棱长度 (e+f+g) |
40 |
60 |
||||
|
熔洞直径 |
工作面 |
6 |
||||
|
非工作面 |
|
8 |
||||
|
裂纹长度 |
宽度≤0.25 |
不限制 |
||||
|
宽度 0.26~0.5 |
30 |
40 |
||||
|
宽度>0.5 |
不准有 |
|||||
|
厚度相对边差 |
1 |
|||||
|
注1:根据用户需求可对砖的一个主要尺寸进行分档，格子砖按高度(厚度)尺寸进行分档。 注2:格子砖长度(宽度)≥250mm及高度(厚度)≥150mm时,尺寸允许偏差供需双方协商。 注3:砖的断面层裂按裂纹数值考核。 |
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6试验方法
6.1砖的检验制样按GB/T 7321进行。
6.2化学成分的测定GB/T 6900或GB/T 21114进行
6.3显气孔率的测定按GB/T 2997进行。
6.4常温耐压强度的测定按GB/T 5072进行。
6.5高温抗折强度的测定按GB/T 3002进行。
6.6尚重软化温应的测定按YB/T 370进行。
6.7抗碱性测定按GB/T 14983进行。
6.8加热永久线变化的测定按GB/T 5988进行。
6.9恋率的测定按GB/T 5073进行。
6.10抗热震性的测定按GB/T 30873进行
6.11砖的外观、尺寸及断面的检香按GB/T 10326进行。
7质量评定程序
7.1组批
砖按牌号进行组批,每批不大于500t。
7.2 抽样及合格判定规则
产品的抽样及验收按GB/T 10325进行。普通粘土砖、致密粘上砖的化学成分、显气孔率、常温耐乐强度及荷重软化温度为验收项目;低蠕变粘土砖的化学成分、显气孔率、常温耐压强度及蜡变率为验收项目;抗热震粘土砖的化学成分、显气孔率、常温耐压强度及抗热震性为验收项目。
7.3 合格评定形式
合格评定可采用供货方声明、使用方认定或第三方认证的形式进行。
8包装、标志、运输、储存及质量证明书
8.1砖的包装、标志、运输和储存按GB/T 16546进行。
8.2砖发出时应附有供方质量部门签发的质量证明书,载明供方名称或厂标、需方名称、发货日期、合同号、标准编号、产品名称、牌号、砖号、批号及相应的理化检验结果等。
Clay refractory brick
1 Range
This standard specifies the terms and definitions, classification, shape and size, technical requirements, test methods, quality assessment procedures, packaging, marking, transportation, storage and quality certificates of clay firebricks.
This standard is applicable to ordinary clay bricks, dense clay bricks, low creep clay bricks and heat shock resistant clay bricks for high temperature kiln
2 Normative reference documents
The following documents are essential for the application of this document. For dated references, the date-only 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 3002 High temperature bending strength test method Refractory materials.
GB/T 5072 refractories – normal temperature compressive strength test method.
GB/T 5073 refractories – creep test method.
GB/T 5988 refractory heating permanent line change test method.
GB/T 6900 – Method for chemical analysis of lead-silicon refractories.
GB/T 7321 shaped refractory product sample preparation 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 14983 test method for alkali resistance of refractories.
GB/T 16546 shaped refractory products packaging, marking, transportation and storage.
GB/T 21114 refractories by X-ray fluorescence spectrochemical analysis of fused cast glass sheets.
Test method for thermal shock resistance of GB/T 30873 refractories.
Test method for load softening temperature of YB/T 370 refractory products (non-differential – rising temperature method).
YB/T 4198 firebrick for ladle shape and dimension.
YB/T 5012 firebricks for blast furnaces and hot blast furnaces.
YB/T 5110 Shape and dimension of refractory bricks for casting.
YB/T 5113 Refractory bricks for casting steel in steel cask.
3 Terms and definitions
The terms and definitions defined in GB/T 10325 and the following terms and definitions apply to this document
3.1
Fireclay refractory brick
Firing of common clay products with hard clay clinker as the main raw material.
3.2
Dense fireclay brick
Fired clay products with low apparent porosity.
3.3
Low creep fireclay refractory brick
Fired clay products with low creep rate.
Thermal shock resistance Fireclay brick
Fired clay products with good thermal shock performance.
4 Classification, shape and size
4.1 Classification
4.1.1 Fireproof clay bricks are divided into four categories: ordinary clay bricks, dense clay bricks, low creep clay bricks and heat shock resistant clay bricks.
4.1.2 According to physical and chemical indexes, ordinary clay bricks are divided into five grades :PN-42, PN-40, PN-35, PN-30 and PN-25. In the grade, P and N are the first letters of common and sticky Chinese pinyin, and the number is the mass percentage of aluminum oxide.
4.1.3 Dense clay bricks are divided into six grades according to physical and chemical indexes :ZMN-45ZMN-42 ZMN-42L, ZMN-40ZMN-30 ZMN-25. In the grade, Z, M, N and L are the initial letters of Chinese pinyin for inducing, dense, sticky and phosphorus, and the numbers are the mass fraction of aluminum oxide. Among them, ZMN-42L is phosphate impregnated brick,ZMN-30, ZMN-25 is alkali resistant clay brick.
4.1.4 According to physical and chemical indexes, low creep clay bricks can be divided into seven grades :DRN-128A,DRN-128B, DRN-125, DRN-120, DRN-115,DRN-110, DRN-105. In the grade, D, R and N are the initial letters of low, loose and viscous Chinese pinyin, and the number is 1/10 of the creep rate test temperature. The letters A and B after the number are grading codes required by different grades of the same brand. 4.1.5 Thermal shock resistant clay bricks are divided into two grades :RZN-42 and RZN-40 according to physical and chemical indexes. In the grade, R, Z and N are the initial letters of Chinese pinyin for heat, shock and viscosity, and the numbers are the mass fraction of aluminum oxide.
4.2 Shape and size
The shape and size of the brick shall comply with the provisions of GB/T 2992,1,YB/T 4198,YB/T 5012,YB/T 5110 and YB/T 5113.
5 Technical Requirements
5.1 The physical and chemical indexes of ordinary clay bricks shall comply with the provisions of Table 1.
5.2 The physical and chemical indexes of dense clay bricks shall comply with the provisions of Table 2.
5.3 The physical and chemical indexes of low-creep clay bricks shall comply with the provisions of Table 3.
5.4 The physical and chemical indexes of heat-shock resistant clay bricks shall comply with the provisions of Table 4.
5.5 The size permissible deviation and appearance requirements of bricks shall comply with the following provisions:
– The size permissible deviation and appearance of the universal brick shall comply with the provisions of Table 5.
– Other special requirements The permissible size deviation and appearance of bricks shall be negotiated by both parties.
|
Table 1 Physical and chemical indexes of common clay bricks |
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|
Item |
Index |
|||||
|
PN-42 |
PN-40 |
PN-35 |
PN-30 |
PN-25 |
||
|
w(Al2O3)/% |
μ0≥ |
42 |
40 |
35 |
30 |
25 |
|
σ |
2.5 |
|||||
|
w(Fe2O3)/% |
μ0≤ |
2.0 |
– |
– |
– |
– |
|
σ |
|
0.4 |
|
|||
|
Apparent porosity/% |
μ0≤ |
20(22) |
24(26) |
26(28) |
23(25) |
21(23) |
|
σ |
2.0 |
|||||
|
Compressive strength at room temperature/MPa |
μ0≥ |
45(35) |
35(30) |
30(25) |
30(25) |
30(25) |
|
Xmin |
35(25) |
25(20) |
20(15) |
20(15) |
20(15) |
|
|
σ |
10 |
|||||
|
0.2MPa load softening temperature T0.6/℃ |
μ0≥ |
1400 |
1 350 |
1320 |
1300 |
1250 |
|
σ |
|
13 |
|
|
||
|
Heating permanent line change /% |
U-L |
1 400 ℃x2h -0.4~0.1 |
1350℃x2h -0.4~0.1 |
1300℃x2 h -0.4~0.1 |
1300℃x2h -0.4~0.1 |
1250 ℃x21 -0.4~0.1 |
|
Note 1: The value in parentheses is the index of lattice brick or special type brick. Note 2: Recommended use :PN-42PN-40PN-35 can be applied to hot blast furnace, coke oven and general industrial furnace; PN-30, PN-25 can be applied to coke oven semi-silicon brick and general industrial furnace alkali resistant brick. Note 3: Thermal shock resistance, volume density according to user requirements to provide test data. Note 4:. Represents the mean value of the qualified quality lot, represents the estimated value of the standard deviation of the lot, U represents the upper specification limit, L represents the lower specification limit. |
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|
Table 2 Physical and chemical indexes of dense clay bricks |
|||||||
|
Item |
Index |
||||||
|
ZMN-45 |
ZMN-42 |
ZMN-42L |
ZMN-40 |
ZMN-30 |
ZMN-25 |
||
|
w(Al2O3)/% |
μ0≥ |
45 |
42 |
42 |
40 |
30 |
25 |
|
σ |
2.5 |
||||||
|
w(Fe2O3)/% |
μ0≤ |
1.2 |
1.5 |
1.8 |
1.7 |
1.6 |
2 |
|
σ |
0.4 |
||||||
|
w(P2O5)/% |
μ0≥ |
– |
– |
5 |
– |
– |
|
|
σ |
– |
– |
0.5 |
– |
– |
– |
|
|
Apparent porosity/% |
μ0≤ |
12(14) |
15(17) |
14 |
17(19) |
15 |
19 |
|
σ |
2 |
||||||
|
Compressive strength at room temperature/MPa |
μ0≥ |
70(60) |
65(55) |
70 |
55(45) |
70 |
50 |
|
Xmin |
60(50) |
55(45) |
60 |
45(35) |
60 |
40 |
|
|
σ |
10 |
||||||
|
0.2MPa load softening temperature T0.6/℃ |
μ0≥ |
1 480 |
1 450 |
1 450 |
1 420 |
1 300 |
1 250 |
|
σ |
13 |
||||||
|
Alkali resistance (strength decline rate)/% |
≤ |
– |
– |
15 |
– |
– |
First-order Crucible method |
|
Heating permanent line change /% |
U-L |
1 450 ℃x3 h -0.2~0.1 |
1450 ℃x3 h -0.2~0.1 |
1 450 ℃x3 h -0.2~0.1 |
1400 ℃x2 h |
1300℃x2 h -0.4~0.1 |
– |
|
Note 1: The value in parentheses is the index of lattice brick or special type brick. Note 2: Recommended application: It can be applied to blast furnace, lime kiln, cement kiln, glass kiln, steel drum, iron water tank and general industrial furnace. Note 3: Thermal shock resistance, volume density according to user requirements to provide test data. |
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|
Table 3 Physical and chemical indexes of low creep clay bricks |
||||||||
|
Item |
Index |
|||||||
|
DRN-128A |
DRN-128B |
DRN-125 |
DRN-120 |
DRN-115 |
DRL-110 |
DRL-105 |
||
|
w(Al2O3)/% |
μ0≥ |
45 |
45 |
45 |
42 |
40 |
36 |
32 |
|
σ |
2.5 |
|||||||
|
w(Fe2O3)/% |
μ0≤ |
1.5 |
1.8 |
1.5 |
1.8 |
1.9 |
2.0 |
2.0 |
|
σ |
|
|
|
0.4 |
|
|
||
|
Apparent porosity/% |
μ0≤ |
15(17) |
18(20) |
20(22) |
20(22) |
22(24) |
22(24) |
22(24) |
|
σ |
2 |
|||||||
|
Compressive strength at room temperature/MPa |
μ0≥ |
60(50) |
55(45) |
45(35) |
35(25) |
35(25) |
30(20) |
25(20) |
|
Xmin |
50(40) |
45(35) |
35(25) |
25(20) |
25(20) |
25(20) |
20(15) |
|
|
σ |
10 |
|||||||
|
High temperature bending strength /MPa(1200℃,0.5h) |
μ0≥ |
6(5) |
5(4) |
|
|
|
|
|
|
Creep rate /%(0.2MPa, 50h) |
μ0≤ |
1280℃x25h |
1280℃X25 h |
1250℃ |
1200℃ |
1150 ℃ |
1100℃ |
1050℃ |
|
σ |
0.1 |
|||||||
|
Heating permanent line change /% |
U-L |
1400℃x2h -0.3~0.1 |
1350℃x |
1300℃x2 h -0.4~0.1 |
||||
|
Note 1: The index of lattice brick or special type brick is in parentheses. Note 2: Recommended use :DRN-128A,DRN-128B can be used for anode roasting, etc. DRN-125DRN-120,DRN-110,DRN-105 can be used in hot blast furnaces. Note 3: Thermal shock resistance, volume density according to user requirements to provide test data. |
||||||||
|
Table 4 Physical and chemical indexes of heat-shock resistant clay bricks |
||||
|
Item |
Index |
|||
|
RZN-42 |
RZN-40 |
|||
|
w(Al2O3)/% |
μ0≥ |
42 |
40 |
|
|
σ |
2.5 |
|||
|
w(Fe2O3)/% |
μ0≤ |
2.0 1.5 |
||
|
σ |
0.4 |
|||
|
σ |
13 |
|||
|
Apparent porosity/% |
μ0≤ |
20(22)16(18) |
||
|
σ |
2.0 |
|||
|
Compressive strength at room temperature/MPa |
μ0≥ |
40(35) |
70(55) |
|
|
Xmin |
35(30) |
55(50) |
||
|
σ |
10 |
|||
|
0.2MPa load softening temperature T0.6/℃ |
μ0≥ |
1420 |
1450 |
|
|
σ |
13 |
|||
|
Heating permanent line change /% |
U-L |
1450℃x2h -0.3~0.1 |
1350℃x2h -0.5~0.1 |
|
|
Thermal shock resistance/time (1100℃, water-cooled) |
≥ |
20 |
10 |
|
|
0.2MPa creep rate /%(1250℃, 50h) |
μ0≤ |
0.8 |
– |
|
|
σ |
0.1 |
– |
||
|
Note 1. The values in parentheses are the indicators of lattice bricks and special bricks. Note 2: Recommended use :RZN-42 can be applied to hot blast stove, etc. RZN-40 can be used in dry quenching furnace, etc. Note 3: Volume density according to user requirements to provide test data. |
||||
|
Table 5 The permissible size deviation and appearance of bricks (universal bricks) are in millimeters |
||||||
|
Item |
Index |
|||||
|
Checker brick |
Other brick |
|||||
|
Allowable deviation of dimension |
Length (width) |
+1 -3 |
Dimension≤150 |
±2 |
||
|
Height (thickness) |
±3 |
Dimension151~345 |
±3 |
|||
|
The spacing of adjacent holes on the same face |
±1 |
Dimension>345 |
±4 |
|||
|
Distortion |
– |
Dimension≤345 |
≤ |
1.0 |
||
|
Dimension>345 |
1.5 |
|||||
|
Missing Angle length(a+b+c) |
≤ |
40 |
||||
|
Missing edge length(e+f+g) |
40 |
60 |
||||
|
Hole diameter |
Working face |
6 |
||||
|
Non-working face |
|
8 |
||||
|
Crack length |
Breadth≤0.25 |
No limit |
||||
|
Breadth0.26~0.5 |
30 |
40 |
||||
|
Breadth>0.5 |
Be forbidden from
|
|||||
|
Thickness relative to edge difference |
1 |
|||||
|
Note 1: According to user requirements, a main size of the brick can be graded, and the lattice brick is graded according to the height (thickness) size. Note 2: When the length (width) of the lattice brick is ≥250mm and the height (thickness) is ≥150mm, the size allows the deviation between the supply and demand parties to negotiate. Note 3: The fracture spalling of brick is evaluated according to the crack value. Note 4: Missing Angle and missing edge length. When there are two or more defects on the working surface of the same brick, the single defect is calculated as 0.7 times of the index in the table. |
||||||
6 Test methods
6.1 Bricks shall be inspected and prepared according to GB/T 7321.
6.2 Determination of chemical composition is performed in GB/T 6900 or GB/T 21114
6.3 The apparent porosity was determined according to GB/T 2997.
6.4 The compressive strength at room temperature shall be measured according to GB/T 5072.
6.5 The bending strength at high temperature is measured according to GB/T 3002.
6.6 The softening temperature of Shangzhong was determined according to YB/T 370.
6.7 Alkaline resistance was measured according to GB/T 14983.
6.8 The determination of the permanent line change of heating is performed according to GB/T 5988.
6.9 The love rate was measured according to GB/T 5073.
6.10 The thermal shock resistance is measured according to GB/T 30873
6.11 The fragrance inspection of the appearance, size and section of bricks shall be carried out according to GB/T 10326.
7 Quality assessment procedures
7.1 Batch
Bricks shall be grouped according to the grade, and each batch shall not be larger than 500t.
7.2 Rules for sampling and conformity determination
Sampling and acceptance of products shall be carried out according to GB/T 10325. The chemical composition, apparent porosity, ambient strength and load softening temperature of ordinary clay brick and compact bonded brick are the acceptance items. The chemical composition, apparent porosity, normal temperature compressive strength and wax variability of low creep clay bricks are the acceptance items. The chemical composition, apparent porosity, normal temperature compressive strength and thermal shock resistance of thermal shock resistant clay brick are the acceptance items.
7.3 Form of conformity assessment
The conformity assessment can be made in the form of the supplier’s declaration, the user’s certification or the third party’s certification.
8 Packing, marking, transportation, storage and quality certificate
8.1 Bricks are packed, marked, transported and stored in GB/T 16546.
8.2 The bricks shall be issued with a quality certificate issued by the quality department of the supplier, indicating the name of the supplier or factory mark, the name of the demander, the date of delivery, the contract number, the standard number, the product name, the brand number, the brick number, the lot number and the corresponding physical and chemical inspection results.
