烧成微孔铝炭砖

1范围

  本标准规定了烧成微孔铝炭砖的术语和定义、牌号和形状尺寸、技术要求、试验方法、质量评定程序包装、标志、运输、储存和质量证明书。

  本标准适用于砌筑高炉内衬用的烧成微孔铝炭砖。

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 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 3000致密定形耐火制品 透气度试验方法

  GB/T 5072耐火材料 常温耐压强度试验方法

  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 16555含碳、碳化硅、氮化物耐火材料化学分析方法

  GB/T 22588闪光法测量热扩散系数或导热系数

  GB/T 24201 高炉炭块抗铁水熔蚀性试验方法

  YB/T 118 耐火材料孔孔径分布试验方法

  YB/T 5012高炉及热风炉用耐火砖形状尺寸

  YB/T 5291高炉炭块导热系数试验方法

3术语和定义

下列术语和定义适用于本文件。

3.1

  烧成微孔铝炭砖 burned microporous alumina graphite brick

  平均孔径不大于1μm,孔径小于1μm的孔容积占开口气孔总容积的百分率不小于70%的烧成铝炭。

4牌号和形状尺寸

4.1烧成微孔铝炭砖按理化指标分为WLT-1WLT-2 两个牌号,WLT分别为“微”“铝”“炭”的汉语拼音首字母。

4.2烧成微孔铝炭砖的形状尺寸应符合 YB/T 5012的规定。

5技术要求

5.1烧成微孔铝炭砖的理化指标应符合表1的规定。

表1烧成微孔铝炭砖的理化指标
项目			指标
			WLT-1	WLT-2
w(Al2O3)/%		≥	65	60
w(C)/%		≥	11	11
w(TFe)/%		≤	1.5	1.5
常温耐压强度/MPa		≥	70	60
体积密度/(g/cm3)		≥	2.85	2.65
显气孔率/%		≤	16	17
铁水熔蚀指数/%		≤	2	3
导热系数/(W/(m·K))	室温	≥	16	16
	300℃	≥	15	15
	600℃	≥	14	14
	800℃	≥	13	13
抗碱性(强度变化率)/%		≤	10	10
透气度/㎡(mDa)		≤	4.94×10-10 (0.5)	1.97×10-9 (2.0)
平均孔径/μm		≤	0.5	0.7
<1μm孔容积/%		≥	80	70
注1:孔径分布检测范围:0.006μm~360μm。 注2:铁水熔蚀指数仅用于炉缸和炉底。

5.2烧成微孔铝炭砖的尺寸偏差及外观要求应符合表 2 的规定,形状尺寸可由供需双方协商确定

表2烧成微孔铝炭砖的尺寸允许偏差 单位为毫米
项目			指标
			WLT-1	WLT-2
尺寸允许偏差	长度		±1.5	±2
	宽度		±1.5	±2
	厚度		±1	±1
扭曲	长度≤345	≤	1	1
	长度>345		1	1.5
裂纹长度	宽度≤0.25		不限制	不限制
	宽度0.26~0.50		<15	<15
	宽度>0.50		不准有	不准有
缺棱(a+b+c)、缺角长度(e+f+g)		≤	25	25
熔洞直径			3	3
注:用该砖砌筑炉底时尺寸允许偏差要求严，磨砖后应达到用户要求。

6试验方法

6.1制样按GB/T 7321进行。

6.2显气孔率、体积密度的测定按GB/T 2997进行

6.3透气度的测定按GB/T 3000进行。

6.4常温耐压强度的测定按GB/T 5072进行。

6.5Al₂O_3、TFe、C含量的测定按GB/T 16555进行。

6.6抗碱性的测定按GB/T 14983进行,结果用强度变化率表示。

6.7铁水熔蚀指数的测定按GB/T 24201进行。

6.8导热系数的测定按YB/T 5291或GB/T 22588进行。

6.91μm 孔容积百分率的测定按YB/T 118进行。

6.10尺寸和外观的检查按GB/T 10326进行。

7质量评定程序

7.1编批

  每批不大于50t。

7.2抽样及合格判定规则

  产品的抽样和验收按GB/T 10325进行,验收检验项目由供需双方协商确定。

8包装、标志运输储存和质量证明书

8.1产品的包装、标志、运输和储存按GB/T 16546进行。

8.2产品发出时应附有质量监督部门签发的质量证明书,质量证明书应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、尺寸、外观及理化检验结果等。

Burned microporous alumina graphite brick

1 Range

  This standard specifies the terms and definitions, grades and shapes, technical requirements, test methods, quality assessment procedures, packaging, marking, transportation, storage and quality certificates of fired microporous aluminum carbon bricks.

  This standard is applicable to the sintered microporous aluminum-carbon bricks used in the lining of blast furnaces.

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.

  Test method for bulk density, apparent porosity and true porosity of GB/T 2997 compact shaped refractory products

  Test method for air permeability of GB/T 3000 dense shaped refractory products

  GB/T 5072 refractories – normal temperature compressive strength test method

  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 16555 Method for chemical analysis of refractories containing carbon, silicon carbide and nitride

  GB/T 22588 flash method to measure thermal diffusivity or thermal conductivity

  GB/T 24201 blast furnace carbon block resistance to molten iron corrosion test method

  YB/T 118 refractories – Test method for pore size distribution

  YB/T 5012 firebricks for blast furnaces and hot blast furnaces

  Test method for thermal conductivity of carbon block in YB/T 5291 blast furnace

3 Terms and definitions

  The following terms and definitions apply to this document.

3.1

  Burned microporous alumina graphite brick

  The average pore size is not more than 1μm, and the pore volume with a pore size less than 1μm accounts for not less than 70% of the total volume of the opening pore.

4 grades and shapes

4.1 The fired microporous aluminum carbon bricks are divided into two grades WLT-1WLT-2 according to physical and chemical indexes, and WLT is the Chinese pinyin initial letter of “micro”, “aluminum” and “carbon” respectively.

4.2 The shape and size of the sintered microporous aluminum carbon brick shall comply with the provisions of YB/T 5012.

5 Technical Requirements5.1 The physical and chemical indexes of sintered microporous aluminum carbon bricks shall conform to the provisions of Table 1.

Table 1. Physical and chemical indexes of sintered microporous aluminum carbon bricks
Item			Index
			WLT-1	WLT-2
w(Al2O3)/%		≥	65	60
w(C)/%		≥	11	11
w(TFe)/%		≤	1.5	1.5
Compressive strength at room temperature/MPa		≥	70	60
Bulk density/(g/cm3)		≥	2.85	2.65
Apparent porosity/%		≤	16	17
Molten iron corrosion index/%		≤	2	3
Thermal conductivity/(W/(m·K))	Room temperature	≥	16	16
	300℃	≥	15	15
	600℃	≥	14	14
	800℃	≥	13	13
Alkali resistance/%		≤	10	10
Air permeability/㎡(mDa)		≤	4.94×10-10 (0.5)	1.97×10-9 (2.0)
Mean aperture/μm		≤	0.5	0.7
<1μm pore volume/%		≥	80	70
Note 1: Aperture distribution detection range :0.006μm~360μm. Note 2: Molten iron corrosion index is only used for hearth and bottom.

5.2 The size deviation and appearance requirements of the fired microporous aluminum carbon brick shall comply with the provisions of Table 2, and the shape and size can be determined by the supply and demand parties through negotiation.

Table 2 The unit of allowable deviation of the size of the sintered microporous aluminum carbon brick is mm
Item			Index
			WLT-1	WLT-2
Allowable deviation of dimension	Length		±1.5	±2
	Breadth		±1.5	±2
	Thickness		±1	±1
Contort	Length≤345	≤	1	1
	Length>345		1	1.5
Crack length	Breadth≤0.25		No limit	No limit
	Breadth0.26~0.50		<15	<15
	Breadth>0.50		Be forbidden from	Be forbidden from
Missing edge (a+b+c), missing Angle length (e+f+g)		≤	25	25
Hole diameter			3	3
Note: When the brick is used to build the furnace bottom, the allowable deviation of the size is strictly required, and the brick should meet the user’s requirements after grinding.

6 Test methods

6.1 Sample preparation is carried out according to GB/T 7321.

6.2 The apparent porosity and bulk density were measured according to GB/T 2997

6.3 The breathability was measured according to GB/T 3000.

6.4 The pressure strength at room temperature is measured according to GB/T 5072.

6.5 The content of Al2O3, TFe and C was determined according to GB/T 16555.

6.6 Alkaline resistance was measured according to GB/T 14983, and the results were expressed by the intensity change rate.

6.7 The determination of molten iron corrosion index was carried out according to GB/T 24201.

6.8 The thermal conductivity is measured according to YB/T 5291 or GB/T 22588.

6.9The percentage of pore volume of 1μm was determined according to YB/T 118.

6.10 Size and appearance checks are carried out according to GB/T 10326.

7 Quality assessment procedures

7.1 Batch Encoding

  Each batch is not larger than 50t.

7.2 Rules for sampling and conformity determination

  The sampling and acceptance of products shall be carried out according to GB/T 10325, and the acceptance inspection items shall be determined through negotiation between the supply and demand parties.

8 Packaging, marking transport storage and quality certificate

8.1 Products are packed, marked, transported and stored in GB/T 16546.

8.2 The product shall be issued with a quality certificate issued by the quality supervision department, which shall indicate the name of the supplier or factory standard, 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 batch number, the size, the appearance and the physical and chemical inspection results.