耐火缓冲泥浆

1范围

  本标准规定了耐火缓冲泥浆的术语和定义、分类和牌号,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。

  本标准适用于高炉、焦炉、热风炉等工业窑炉高铝质和碳化硅质耐火砌体须缓冲热膨胀应力处的填充材料。

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 5072耐火材料 常温耐压强度试验方法

  GB/T 6900铝硅系耐火材料化学分析方法

  GB/T 8170数值修约规则与极限数值的表示和判定

  GB/T 15545不定形耐火材料包装、标志、运输和储存

  GB/T 16555含碳、碳化硅、氨化物耐火材料化学分析方法

  GB/T 17617耐火原料和不定形耐火材料 取样

  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 22459.1耐火泥浆 第1部分:稠度试验方法(锥人度法)

  GB/T 22459.7耐火泥浆 第7部分:高温性能试验方法

  YB/T 370耐火制品 荷重软化温度试验方法(非示差–升温法)

3术语和定义

  下列术语和定义适用于本文件。

3.1

  耐火缓冲泥浆 refractory cushion mortars

  以可压缩的耐火材料为主要原料制成,用于缓冲耐火砌体热膨胀应力的特种耐火泥浆。

4分类和牌号

  耐火缓冲泥浆按材质分为高铝质耐火缓冲泥浆和碳化硅质耐火缓冲泥浆两类。高铝质耐火缓冲泥浆按氧化铝含量不同和使用部位对热态压缩率的不同要求分为HCN-L1、HCN-L2和HCN-L3三个牌号。碳化硅质耐火缓冲泥浆牌号为HON-TG。标记中H、C、N分别是缓、冲、泥(浆)的汉语拼音首字母,其后的L、T、G分别是(高)铝、碳(化)硅的汉语拼音首字母;1、2、3为高铝质耐火缓冲泥浆的产品序号。

5技术要求

  耐火缓冲泥浆的理化指标应符合表1的规定。

表1耐火缓冲泥浆理化指标
项目		HCN-L1	HCN-L2	HCN-L3	HCN-TG
w(Al2O3)/% ≥		70	70	60	–
w(SiC)/%≥		–			50
稠度(锥入度)/0.1mm≤		240			260
常温耐压强度/MPa≥	烘干后	0.50 (110℃X24h)			1.00 (200℃X24h)
	1000℃X3h烧后	0.20			0.25
加热永久线变化(1000℃X3h烧后)/%		-1.0~0			-1.0~0
热态压缩率(1MPa,1000℃)/%≥		30	15		30

6试验方法

6.1Al₂O₃的测定按GB/T 6900或GB/T 21114进行。高铝质耐火缓冲泥浆试样应经(1000℃x1h)处理。

6.2SiC的测定按GB/T 16555进行。碳化硅质耐火缓冲泥浆试样应经(800℃x1h)处理。

6.3稠度的测定按GB/T 22459.1进行。

6.4常温耐压强度的测定按GB/T 5072进行。试样制备方法按附录A进行。

6.5加热永久线变化的测定按GB/T 22459.7进行。试样制备方法按附录A进行。

6.6热态压缩率的测定按附录B进行。

7质量评定程序

7.1组批

  产品按连续正常生产的同一牌号组批。同一牌号的产品每批不超过20t。原料或生产工艺变动时则应另行组批。

7.2抽样

  抽样按GB/T 17617进行。

7.3判定规则

7.3.1化学成分、常温耐压强度(烘干后;1000℃x3h烧后)、热态压缩率(1MPa,1000℃)为验收检验项目,检验结果的平均值均符合表1的规定值时,该批产品为合格。

7.3.2检验结果如有不合格项时,应按7.2的规定重新取样对不合格项进行复检。复检结果的平均值符合表1的规定,则判定该批产品合格;否则,判为不合格。

7.4合格评定形式

  合格评定可根据双方协议规定或者采用供货方声明、使用方认定或第三方认证的形式进行。

8包装、标志、运输、储存和质量证明书

8.1包装、标志、运输和储存按GB/T 15545的规定进行,单位包装重量由供需双方协议确定。

8.2每一批产品发出时,应附有质量证明书和产品使用说明书,质最证明书应载明供方名称、需方名称生产日期、产品名称、牌号、批号、理化指标检验结果等,产品使用说明书应载明使用方法、注意事项和保质期等。

 

 

 

Refractory cushion mortars

1 Range

  This standard specifies the terms and definitions, classification and grades of refractory buffer mud, technical requirements, test methods, quality assessment procedures, packaging marks, transportation, storage and quality certificates.

  This standard is applicable to the filling materials where the high alumina and silicon carbide refractory masonry of blast furnace, coke oven, hot blast furnace and other industrial furnaces need to buffer the thermal expansion stress.

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 5072 refractories – normal temperature compressive strength test method

  GB/T 6900 aluminum-silicon refractory chemical analysis method

  GB/T 8170 numerical revision rules and limit value representation and judgment

  GB/T 15545 amorphous refractory packaging, marking, transportation and storage

  GB/T 16555 Method for chemical analysis of carbon, silicon carbide and ammoniated refractories

  GB/T 17617 Sampling of refractory raw materials and amorphous refractories

  GB/T 21114 refractories by X-ray fluorescence spectrochemical analysis of fused cast glass sheets

  GB/T 22459.1 Refractory mud – Part 1: Test method for consistency (Conical degree method)

  GB/T 22459.7 Refractory mud – Part 7: Test method for high temperature performance

  Test method for Load softening temperature of YB/T 370 refractory products (non-differential warming method)

3 Terms and definitions

  The following terms and definitions apply to this document.

3.1

  Refractory cushion mortars

  Special refractory mud made of compressible refractory material as the main raw material for cushioning the thermal expansion stress of refractory masonry.

4 Classification and brand

  Refractory buffer mud according to the material is divided into high alumina refractory buffer mud and silicon carbide refractory buffer mud two categories. High alumina refractory buffer mud is divided into HCN-L1, HCN-L2 and HCN-L3 three grades according to the different alumina content and the different requirements of the hot compression rate of the use site. Silicon carbide refractory buffer mud grade is HON-TG. In the marks, H, C and N are the initial letters of slow, punch and mud (pulp), followed by L, T and G are the initial letters of (high) aluminum and carbon (chemical) silicon; 1, 2, 3 are the product serial numbers of high alumina refractory buffer mud.

5 Technical Requirements

  The physical and chemical indexes of refractory buffer mud shall conform to the provisions of Table 1.

Table 1. Physical and chemical indexes of refractory buffer mud
Item		HCN-L1	HCN-L2	HCN-L3	HCN-TG
w(Al2O3)/% ≥		70	70	60	–
w(SiC)/%≥		–			50
Consistency/0.1mm≤		240			260
Compressive strength at room temperature/MPa≥	After drying	0.50 (110℃X24h)			1.00 (200℃X24h)
	1000℃X3hAfter burning	0.20			0.25
Heating permanent line change(1000℃X3h After burning)/%		-1.0~0			-1.0~0
Hot compression rate(1MPa,1000℃)/%≥		30	15		30

6 Test methods

6.1Al2O3 is determined at GB/T 6900 or GB/T 21114. The high alumina refractory buffer mud sample should be treated at (1000℃x1h).

6.2SiC is measured according to GB/T 16555. The silicon carbide refractory buffer mud sample should be treated at (800℃x1h).

6.3 Consistency was determined according to GB/T 22459.1.

6.4 The compressive strength at room temperature shall be measured according to GB/T 5072. The sample preparation method is carried out in Appendix A.

6.5 The determination of permanent line change of heating was performed according to GB/T 22459.7. The sample preparation method is carried out in Appendix A.

6.6 The hot compression rate was determined in accordance with Appendix B.

7 Quality assessment procedures

7.1 Batch

  The products are batch according to the same grade of continuous normal production. Each batch of products of the same brand shall not exceed 20t. In case of changes in raw materials or production processes, separate batches should be set up.

7.2 Sampling

  Sampling was conducted according to GB/T 17617.

7.3 Decision Rules

7.3.1 Chemical composition, room temperature compressive strength (after drying; After firing at 1000℃x3h) and hot compression rate (1MPa,1000℃) are acceptance inspection items, and when the average value of the test results meet the specified values in Table 1, the batch of products is qualified.

7.3.2 If there are any nonconforming items in the inspection results, the nonconforming items shall be re-sampled in accordance with the provisions of 7.2 for re-inspection. If the average value of the reinspection results conforms to the provisions of Table 1, the batch of products is judged to be qualified; Otherwise, it is disqualified.

7.4 Form of conformity assessment

  Conformity assessment can be made in accordance with the agreement between the two parties or in the form of the supplier’s statement, the user’s certification or the third party’s certification.

8 Packing, marking, transportation, storage and quality certificate

8.1 Packaging, marking, transportation and storage shall be carried out in accordance with the provisions of GB/T 15545, and the weight of the unit package shall be determined by agreement between the supply and demand parties.

8.2 When each batch of products is issued, it shall be accompanied by a quality certificate and a product instruction manual. The quality certificate shall state the name of the supplier, the name of the demander, the date of production, the name of the product, the brand number, the batch number, the test results of physical and chemical indexes, etc. The product instruction manual shall state the method of use, precautions and shelf life, etc.