GB/T 22589-2017 镁碳砖/magnesia carbon brick
镁碳砖
1.范围
本标准规定了镁碳砖的分类和牌号、技术要求、试验方法、质量评定程序、包装、标志、运输、储存及质量证明书。
本标准适用于炼钢转炉、电炉、钢包(精炼炉)等用的镁碳砖。
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 3002耐火材料，高温抗折强度试验方法。
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 16546定形耐火制品包装、标志、运输和储存。
GB/T 16555今碳、碳化硅、氮化物耐火材料化学分析方法。
GB/T 21114耐火材料 X射线费光光谱化学分析熔铸玻璃片法。
3.分类和牌号
3.1镁碳砖按碳含量分为7类,按理化指标分为 26 个牌号,见表1牌号中M、T为镁、碳汉语拼音首字母，其后的数字表示碳的质量分数，A、B、C、D 则是同类的不同级别。
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表1镁碳砖的分类和牌号 |
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|
MT-5A |
MT-8A |
MT-10A |
MT-12A |
MT-14A |
MT-16A |
MT-18A |
|
MT-5B |
MT-8B |
MT-10B |
MT-12B |
MT-14B |
MT-16B |
MT-18B |
|
MT-5C |
MT-8C |
MT-10C |
MT-12C |
MT-14C |
MT-16C |
MT-18C |
|
MT-5D |
MT-8D |
MT-10D |
MT-12D |
MT-14D |
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3.2 对于有特殊要求的产品，由供需双方协商确定。
4.技术要求
4.1镁碳砖的理化指标应符合表 2 的规定。
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表2镁碳砖的理化指标 |
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|
牌号 |
显气孔率/% |
体积密度/(g/cm-3) |
常温耐压强度/MPa |
高温抗折强度 (1400 CX0. 5 h)/MP |
w(MgO)/% |
w(C)/% |
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|
μ0≤ |
σ |
μ0≥ |
σ |
μ0 |
σ |
μ0≥ |
σ |
μ0≥ |
σ |
μ0≥ |
σ |
|
|
MT-5A |
5.0 |
1.0 |
3.10 |
0.05 |
50.0 |
10.0 |
– |
– |
85.0 |
1.5 |
5.0 |
1.0 |
|
MT-5B |
6.0 |
3.02 |
50.0 |
– |
– |
84.0 |
5.0 |
|||||
|
MT-5C |
7.0 |
2.92 |
45.0 |
– |
– |
82.0 |
5.0 |
|||||
|
MT-5D |
8.0 |
2.90 |
40.0 |
– |
– |
80.0 |
5.0 |
|||||
|
MT-8A |
4.5 |
3.05 |
45.0 |
– |
– |
82.0 |
8.0 |
|||||
|
MT-8B |
5.0 |
3.00 |
45.0 |
– |
– |
81.0 |
8.0 |
|||||
|
MT-8C |
6.0 |
2.90 |
40.0 |
– |
– |
79.0 |
8.0 |
|||||
|
MT-8D |
7.0 |
2.87 |
35.0 |
– |
– |
77.0 |
8.0 |
|||||
|
MT-10A |
4.0 |
0.5 |
3.02 |
0.03 |
40.0 |
6.0 |
1.0 |
80.0 |
10.0 |
|||
|
MT-10B |
4.5 |
2.97 |
40.0 |
– |
– |
79.0 |
10.0 |
|||||
|
MT-10C |
5.0 |
2.92 |
35.0 |
– |
– |
77.0 |
10.0 |
|||||
|
MT-10D |
6.0 |
2.87 |
35.0 |
– |
– |
75.0 |
10.0 |
|||||
|
MT-12A |
4.0 |
2.97 |
40.0 |
6.0 |
1.0 |
78.0 |
1.2 |
12.0 |
||||
|
MT-12B |
4.0 |
2.94 |
35.0 |
– |
– |
77.0 |
12.0 |
|||||
|
MT-12C |
4.5 |
2.92 |
35.0 |
– |
– |
75.0 |
12.0 |
|||||
|
MT-12D |
5.5 |
2.85 |
30.0 |
– |
– |
73.0 |
12.0 |
|||||
|
MT-14A |
3.5 |
2.95 |
38.0 |
10.0 |
1.0 |
76.0 |
14.0 |
|||||
|
MT-14B |
3.5 |
2.90 |
35.0 |
– |
– |
74.0 |
14.0 |
|||||
|
MT-14C |
4.0 |
2.87 |
35.0 |
– |
– |
72.0 |
14.0 |
|||||
|
MT-14D |
5.0 |
2.81 |
30.0 |
– |
– |
68.0 |
14.0 |
|||||
|
MT-16A |
3.5 |
2.92 |
35.0 |
8.0 |
8.0 |
1.0 |
74.0 |
16.0 |
0.8 |
|||
|
MT-16B |
3.5 |
2.87 |
35.0 |
– |
– |
72.0 |
16.0 |
|||||
|
MT-16C |
4.0 |
2.82 |
30.0 |
– |
– |
70.0 |
16.0 |
|||||
|
MT-18A |
3.0 |
2.89 |
35.0 |
10.0 |
1.0 |
72.0 |
18.0 |
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|
MT-18B |
3.5 |
2.84 |
30.0 |
– |
– |
70.0 |
18.0 |
|||||
|
MT-18C |
4.0 |
2.79 |
30.0 |
– |
– |
69.0 |
18.0 |
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|
注:μ0代表合格质量批均值，σ代表批标准偏差估计值. |
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4.2 砖的形状尺寸可由供需双方协商确定,砖的尺寸偏差及外观要求应符合表3 的规定。
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表3镁碳砖的尺寸允许偏差及外观 单位为毫米 |
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项 目 |
指 标 |
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尺寸允许偏差 |
尺寸 |
<200 |
士1.0° |
|
201~300 |
士1.5 |
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>300 |
士2.0 |
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扭曲 |
长度 |
≤500 |
≤1.0 |
|
>500 |
≤1.5 |
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缺角(a+b+c) |
≤25 |
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缺棱(e+f+g) |
30 |
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裂纹宽度 |
≤0.1 |
不限制 |
|
|
>0.1 |
不准有 |
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楔度差 |
≤1.5 |
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砌筑环高方向尺寸偏差 |
士1.0 |
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相对边差 |
≤1.0 |
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|
断面层裂 |
不准有 |
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平砌时，宽度尺寸允许偏差±1.5mm；侧砌时，厚度尺寸允许偏差±1.5mm。 |
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5 试验方法
5.1 砖的检验制样按 GB/T 7321 进行。
5.2化学分析按 GB/T 16555、GB/T 21114 进行。
5.3显气孔率、体积密度的测定按 GB/T 2997 进行。
5.4常温耐压强度的测定按 GB/T 5072 进行。
5.5高温抗折强度的测定按 GB/T 3002 进行。
5.6 砖的尺寸、外观及断面的检查按 GB/T 10326 进行。
6质量评定程序
6.1组批
产品按同一牌号组批，每批不应超过150t。
6.2 抽样及合格判定规则
产品的抽样、验收按 GB/T 10325 进行,显气孔率、体积密度、常温耐压强度及 MgO,C 的含量为验收检验项目。
6.3 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。
7.包装、标志、运输、储存及质量证明书
7.1产品的包装、标志、运输和储存按 GB/T 16546 进行。
7.2运输和储存中，产品应严防潮湿。
7.3 砖发出时应附有供方质量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、需方名利发货日期、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。
Magnesia-carbon brick
Step 1: Scope
This standard specifies the classification and grade, technical requirements, test methods, quality assessment procedures, packaging, marking, transportation, storage and quality certificates of magnesia carbon bricks.
This standard applies to magnesium-carbon bricks used in steel converter, electric furnace, ladle (refining furnace), etc.
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.
GB/T 3002 refractories, high temperature bending strength test method.
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 16546 shaped refractory products packaging, marking, transportation and storage.
GB/T 16555 Method for chemical analysis of carbon, silicon carbide and nitride refractories.
GB/T 21114 refractories by X-ray fetooptical spectrochemical analysis of fused cast glass sheets.
3.Classification and brand
3.1 Magnesium-carbon bricks are divided into 7 categories according to carbon content and 26 grades according to physical and chemical indexes. In Table 1, M and T are the initial letters of magnesium and carbon in Chinese pinyin, and the numbers after them represent the quality fraction of carbon, while A, B, C and D are different levels of the same class.
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Table 1 Classification and grade of magnesia-carbon bricks |
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MT-5A |
MT-8A |
MT-10A |
MT-12A |
MT-14A |
MT-16A |
MT-18A |
|
MT-5B |
MT-8B |
MT-10B |
MT-12B |
MT-14B |
MT-16B |
MT-18B |
|
MT-5C |
MT-8C |
MT-10C |
MT-12C |
MT-14C |
MT-16C |
MT-18C |
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MT-5D |
MT-8D |
MT-10D |
MT-12D |
MT-14D |
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3.2 Products with special requirements shall be determined by both parties through negotiation.
4.Technical requirements
4.1 The physical and chemical indexes of magnesium-carbon bricks shall comply with the provisions of Table 2.
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Table 2 Physical and chemical indexes of magnesia-carbon bricks |
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Brand |
Apparent porosity /% |
Bulk density/(g/cm-3) |
Compressive strength at room temperature/MPa |
High temperature bending strength (1400 CX0. 5 h)/MP |
w(MgO)/% |
w(C)/% |
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|
μ0≤ |
σ |
μ0≥ |
σ |
μ0 |
σ |
μ0≥ |
σ |
“μ0≥ |
σ |
μ0≥ |
σ |
|
|
MT-5A |
5.0 |
1.0 |
3.10 |
0.05 |
50.0 |
10.0 |
– |
– |
85.0 |
1.5 |
5.0 |
1.0 |
|
MT-5B |
6.0 |
3.02 |
50.0 |
– |
– |
84.0 |
5.0 |
|||||
|
MT-5C |
7.0 |
2.92 |
45.0 |
– |
– |
82.0 |
5.0 |
|||||
|
MT-5D |
8.0 |
2.90 |
40.0 |
– |
– |
80.0 |
5.0 |
|||||
|
MT-8A |
4.5 |
3.05 |
45.0 |
– |
– |
82.0 |
8.0 |
|||||
|
MT-8B |
5.0 |
3.00 |
45.0 |
– |
– |
81.0 |
8.0 |
|||||
|
MT-8C |
6.0 |
2.90 |
40.0 |
– |
– |
79.0 |
8.0 |
|||||
|
MT-8D |
7.0 |
2.87 |
35.0 |
– |
– |
77.0 |
8.0 |
|||||
|
MT-10A |
4.0 |
0.5 |
3.02 |
0.03 |
40.0 |
6.0 |
1.0 |
80.0 |
10.0 |
|||
|
MT-10B |
4.5 |
2.97 |
40.0 |
– |
– |
79.0 |
10.0 |
|||||
|
MT-10C |
5.0 |
2.92 |
35.0 |
– |
– |
77.0 |
10.0 |
|||||
|
MT-10D |
6.0 |
2.87 |
35.0 |
– |
– |
75.0 |
10.0 |
|||||
|
MT-12A |
4.0 |
2.97 |
40.0 |
6.0 |
1.0 |
78.0 |
1.2 |
12.0 |
||||
|
MT-12B |
4.0 |
2.94 |
35.0 |
– |
– |
77.0 |
12.0 |
|||||
|
MT-12C |
4.5 |
2.92 |
35.0 |
– |
– |
75.0 |
12.0 |
|||||
|
MT-12D |
5.5 |
2.85 |
30.0 |
– |
– |
73.0 |
12.0 |
|||||
|
MT-14A |
3.5 |
2.95 |
38.0 |
10.0 |
1.0 |
76.0 |
14.0 |
|||||
|
MT-14B |
3.5 |
2.90 |
35.0 |
– |
– |
74.0 |
14.0 |
|||||
|
MT-14C |
4.0 |
2.87 |
35.0 |
– |
– |
72.0 |
14.0 |
|||||
|
MT-14D |
5.0 |
2.81 |
30.0 |
– |
– |
68.0 |
14.0 |
|||||
|
MT-16A |
3.5 |
2.92 |
35.0 |
8.0 |
8.0 |
1.0 |
74.0 |
16.0 |
0.8 |
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|
MT-16B |
3.5 |
2.87 |
35.0 |
– |
– |
72.0 |
16.0 |
|||||
|
MT-16C |
4.0 |
2.82 |
30.0 |
– |
– |
70.0 |
16.0 |
|||||
|
MT-18A |
3.0 |
2.89 |
35.0 |
10.0 |
1.0 |
72.0 |
18.0 |
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|
MT-18B |
3.5 |
2.84 |
30.0 |
– |
– |
70.0 |
18.0 |
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|
MT-18C |
4.0 |
2.79 |
30.0 |
– |
– |
69.0 |
18.0 |
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Note :μ0 represents the average qualified quality lot and σ represents the estimated standard deviation of the lot. |
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4.2 The shape and size of the brick can be determined by the supply and demand parties through negotiation, and the size deviation and appearance requirements of the brick shall comply with the provisions of Table 3.
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Table 3 The unit of allowable size deviation and appearance of magnesium-carbon brick is mm |
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Item |
index |
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|
Allowable deviation of dimension |
Dimension |
<200 |
士1.0° |
|
201~300 |
士1.5 |
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|
>300 |
士2.0 |
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|
Distortion |
Length |
≤500 |
≤1.0 |
|
>500 |
≤1.5 |
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|
Missing Angle length(a+b+c) |
≤25 |
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|
Missing edge length(e+f+g) |
30 |
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|
Crack width |
≤0.1 |
unlimited |
|
|
>0.1 |
Be forbidden from |
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Wedge difference |
≤1.5 |
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Dimension deviation of masonry ring height direction |
士1.0 |
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|
Relative edge difference |
≤1.0 |
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Fracture lamination |
Be forbidden from |
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When laying flat, the permissible deviation of width size is ±1.5mm; When side building, the allowable deviation of thickness dimension is ±1.5mm. |
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5 Test methods
5.1 Bricks shall be inspected and prepared according to GB/T 7321.
5.2 Chemical analysis was performed according to GB/T 16555 and GB/T 21114.
5.3 The apparent porosity and bulk density were measured according to GB/T 2997.
5.4 The compressive strength at room temperature shall be measured according to GB/T 5072.
5.5 The bending strength at high temperature is measured according to GB/T 3002.
5.6 The inspection of size, appearance and section of bricks shall be carried out according to GB/T 10326.
6 Quality assessment procedures
6.1 Batch Groups
The products shall be batch according to the same brand, and each batch shall not exceed 150t.
6.2 Sampling and conformity determination rules
The sampling and acceptance of the products are carried out according to GB/T 10325, and the apparent porosity, bulk density, compressive strength at room temperature and the content of MgO and C are the acceptance inspection items.
6.3 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.
7.Packing, marking, transportation, storage and quality certificate
7.1 Products are packed, marked, transported and stored in GB/T 16546.
7.2 During transportation and storage, the product shall be strictly protected from moisture.
7.3 The bricks shall be issued with a quality certificate issued by the quality department of the supplier, which shall state the name of the supplier or factory standard, the date of delivery of the demander’s fame and wealth, contract number, standard number, product name, brand number, brick number, lot number and corresponding physical and chemical inspection results.
