This standard specifies the tools and methods for the inspection of the dimensions and appearance of blast furnace carbon blocks. This standard is applicable to the inspection of the dimensions and appearance of mechanically processed ordinary blast furnace carbon blocks, semi-graphite blast furnace carbon blocks, microporous carbon blocks for blast furnaces, etc. YB/T 4034-2001 Methods for the inspection of the dimensions and appearance of blast furnace carbon blocks YB/T4034-2001 Standard download decompression password: www.bzxz.net

YB/T4034—2001
This standard is revised on the basis of the original YB/T4034-1991 "Blast furnace carbon block size and appearance inspection method". The main revisions are as follows:
Standard writing format;
Scope of application;
Cited standards;
The structure has been adjusted, and a tool chapter has been added. All the relevant tool requirements in the original standard clauses have been merged into this chapter;-Added the inspection method for distortion;
Deleted Articles 4.1 and 4.3.
This standard replaces YB/T4034--1991 "Blast furnace carbon block size and appearance inspection method" from the date of implementation. This standard is proposed and managed by the Metallurgical Industry Information Standards Research Institute. The main drafting units of this standard are: Lanzhou Carbon Co., Ltd., Metallurgical Industry Information Standards Research Institute. The main drafters of this standard are: Liu Chengquan, Tang Xuehui, and Sun Wei. This standard was first issued in 1991.
1 Scope
Standard of the People's Republic of China for Ferrous Metallurgical Industry Size and Appearance Inspection Method for Carbon Blocks of Blast Furnaces
Method for dimensions and aspect for the carbon block of blast furnaces This standard specifies the tools and methods for the size and appearance inspection of carbon blocks of blast furnaces. YB/T4034--2001
YB/T 4034—1991
This standard applies to the inspection of the dimensions and appearance of products such as ordinary blast furnace carbon blocks, semi-graphite blast furnace carbon blocks, and microporous carbon blocks for blast furnaces that have been machined.
2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T.8719--1997 General provisions for packaging, marking, storage, transportation and quality certificates of carbon materials and their products YB/T5192--1993 Size of blast furnace carbon blocks
3 Tools
3.1 The right-angle steel ruler requires secondary accuracy, and its size is: a) When checking carbon blocks with a vertical dimension of 400mm, use a 400mm×200mm right-angle steel ruler; b) When the vertical dimension of the carbon block is 500mm, use a 500mm×315mm right-angle steel ruler; c) When the vertical dimension of the carbon block is 800mm, use a 800mm×500mm right-angle steel ruler; d) The steel ruler requires secondary accuracy, and the size requirement is 400mm. 3.2 The width of the second-level accuracy feeler gauge is 10mm. When measuring, use a feeler gauge with a thickness 0.1mm larger than the allowable value specified in the standard (hereinafter referred to as the feeler gauge).
3.3 The diameter of the steel wire is 0.3mm, 0.5mm.
3.4 ​​The ruler should be made of aluminum alloy, with a length of 2m or more (the unevenness requirement is not more than 0.6mm, and the second-level flat ruler and second-level feeler gauge are used for calibration). 3.5 The tools used for the size and appearance inspection of blast furnace carbon blocks are based on the special tools kept by the quality inspection department, and are regularly calibrated by the metrology department of this unit.
4 Inspection method
4.1 Dimension measurement method
4.1.1 The size inspection shall be carried out in accordance with the provisions of YB/T5192. Or it shall be based on the provisions of the order drawing. 4.1.2 When measuring the size of carbon blocks, it is necessary to ensure that the zero point of the size is aligned with the edge of the block. When measuring the length and vertical height, a steel tape measure or ruler can be used. When measuring the cross-sectional size of carbon blocks, a caliper should be used. 4.1.3 When measuring the size of carbon blocks, the influence of missing edges or corners should be avoided. 4.2 Method for checking verticality
Approved by the State Economic and Trade Commission on July 9, 2001, implemented on January 1, 2002
YB/T4034—2001
4.2.1 The verticality of the two perpendicular surfaces of the carbon block is checked with a right-angle steel ruler and a feeler gauge. When checking, place the short side of the ruler angle flat on the plane of the carbon block, and the upper or lower end of the long side of the right-angle ruler close to the vertical surface of the carbon block to be checked. Then use the feeler gauge to smoothly insert into the gap between the long side of the right-angle steel ruler and the vertical surface of the carbon block. If it cannot be inserted, it is qualified. 4.3 Method for checking holes or convex and concave
4.3.1 Depth refers to the maximum dimension from the outer surface. 4.3.2 Diameter refers to its maximum diameter.
4.4 Inspection method for corner and edge chips
4.4.1 The depth of the edge chip is measured by a chip measuring device that can measure the maximum depth along the direction of the bisector of the angle between the two sides of the edge. 4.4.2 Unless otherwise specified, all edges with a depth of 5mm to the limit of the standard allowable value shall be included in the calculation. A 5mm deep edge chip shall not be considered as an edge chip.
4.4.3 The range of corner and edge chips shall be checked according to the sum of the three sides (a+b+c), as shown in Figure 1. (a)www.bzxz.net
4.5 Inspection of cracks
4.5.1 Steel wire (3.3) can be used to check cracks. For cracks that cannot be inserted with a 0.3mm steel wire, its width is expressed as 0.3mm. For cracks that can be inserted with a 0.3mm steel wire but cannot be inserted with a 0.5mm steel wire, its width is expressed as 0.3mm~0.5mm, and so on. 4.5.2 The length of the crack is measured from the starting point of the crack to the end point of the crack in the direction of crack extension. 4.6 Method for checking surface flatness
4.6.1 When checking the surface of the carbon block for "concave center", place a ruler of 2m or more on the surface of the carbon block to be checked, and use a feeler gauge (3.2) to smoothly insert into the gap between the ruler and the surface of the carbon block. If it cannot be inserted, it is qualified. 4.6.2 When checking the surface of the carbon block for "convex belly", the surface to be checked will face the ruler to keep the carbon block naturally stable. Then insert the feeler gauge (3.2) smoothly along the gap between the ruler and the carbon block. If it cannot be inserted, it is qualified. 4.7 Inspection of knife marks
The depth of the knife mark is checked using a 400mm long steel ruler and a feeler gauge according to the "concave center" inspection method. The width and length of the knife mark are measured with a steel ruler. 4.8 Inspection of distortion
For the inspection of distortion, place a ruler of 2m or more on the diagonal of the carbon block to check its distortion. 5 Inspection Rules
5.1 Blast furnace carbon blocks shall be inspected one by one according to the specified items and records shall be kept. 5.2 The inspection of blast furnace carbon blocks shall be carried out by the technical quality supervision department. 364
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