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GB/T 18838.3-2008 PDF English

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GB/T 18838.3-2008: Preparation of steel substrates before application of paints and related products -- Specifications for metallic blast-cleaning abrasives -- Part 3: High-carbon cast-steel shot and grit
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GB/T 18838.3-2008: Preparation of steel substrates before application of paints and related products -- Specifications for metallic blast-cleaning abrasives -- Part 3: High-carbon cast-steel shot and grit

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Preparation of steel substrates before application of paints and related products.Specifications for metallic blast-cleaning abrasives.Part 3. High-carbon cast-steel shot and grit ICS 25.220.10 A29 National Standards of People's Republic of China GB/T 18838.3-2008/ISO 11124-3.1993 Coating steel surface treatment before coating Technical requirements for blast cleaning metal abrasives Part 3. High Carbon Cast Steel Balls and Sand (ISO 11124-3.1993, IDT) Posted on.2008-04-01 2008-09-01 Implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Administration released

Foreword

GB/T 18838 "Technical Requirements for Metallic Abrasives for Surface Cleaning of Steel Sheets Prior to Coating Coatings" is divided into the following sections. --- Part 1. Guidelines and classifications; --- Part 2. Chilled cast iron sand; ---Part 3. High-carbon cast steel balls and sand; ---Part 4. Low-carbon cast steel pellets; --- Part 5. Wire section. This part is part 3 of GB/T 18838. This section is equivalent to the technical requirements of ISO 11124-3.1993 "Applying Metal Abrasives for Spray Cleaning of Steel Surfaces before Coatings." Part 3. High Carbon Cast Steel Balls and Sand (English Edition). This section is equivalent translation ISO 11124-3.1993. For ease of use, this section made the following editorial changes. --- The term "this international standard" is replaced by "this part"; ---Replace the comma "," as a decimal point with a decimal point "."; --- Use the "," instead of the comma "," as a statement; --- Increased the list of Table 3; --- Deleted the foreword of international standards. Appendix A and Appendix B of this section are informative annexes. This part is proposed by China State Shipbuilding Corporation. This part is under the jurisdiction of the Technical Committee of Metal Surface Treatment and Painting Technology before painting by the National Standardization Technical Committee for Coatings and Pigments. This section was drafted by. China National Shipbuilding Industry Comprehensive Technology and Economic Research Institute, the 11th Institute of China Shipbuilding Industry, Shandong Kaitai Metal Abrasives Co., Ltd., Shandong University. The main drafters of this section. Song Yanyuan, Liu Bingyang, Fu Jianhua, Liu Ruwei, Wang Ruiguo, Song Qingan. GB/T 18838.3-2008/ISO 11124-3.1993 Coating steel surface treatment before coating Technical requirements for blast cleaning metal abrasives Part 3. High Carbon Cast Steel Balls and Sand Warning. The abrasives, materials and equipment used for surface treatment may be dangerous if used carelessly. Many countries have during use Or after use (waste management) materials and abrasives that are considered to be dangerous, such as. free silicon, carcinogens or toxic substances, have been specified. because Therefore, these regulations should be observed. It is important to ensure that appropriate guidance and all required preventive measures are implemented.

1 Scope

This part of GB/T 18838 specifies 14 grades of high carbon cast steel shots for blast cleaning and 12 grades of high carbon cast steel sanders. Material requirements, including hardness, density, defects and structural requirements, and chemical composition. The requirements of this part of ISO /IEC 18838 apply only to abrasives that have not been used, and do not apply to used abrasives. The test method for blast cleaning metal abrasives is shown in various parts of GB/T 19816. High-carbon cast steel pellets and sand are recyclable and reusable abrasives that can be used both in fixed and on-site injection equipment. Note 1. Refer to Appendix A and Appendix B for a list of commonly used standards for metal abrasives in the world and their relationship with this standard. Note 2. Although this part of the GB/T 18838 is specifically formulated to meet the surface treatment requirements of steel structures, the specified characteristics are generally applicable to Surfaces or components of other materials treated with jet cleaning techniques. These provisions are already in ISO 8504-2.20001) "Coating the surface of steel before coating Surface Treatment Methods Part 2. Abrasive blast cleaning.

2 Normative references

The clauses in the following documents are quoted in this part of GB/T 18838 and become the terms of this part. Any quoted text Any subsequent amendments (not including errata content) or revisions do not apply to this section, however, it is encouraged to achieve The parties to the agreement study whether the latest versions of these documents can be used. For undated references, the latest edition applies to this section. GB/T 19816.1-2005 Preparation of steel substrates before application of paints. Test methods for spray-cleaning metal abrasives. Part 1. Sampling (ISO 11125-1.1993, IDT) GB/T 19816.2-2005 Preparation of steel substrates before application of paints. Test method for metal abrasives for blast cleaning. Part 2. Determination of particle size distribution (ISO 11125-2.1993, IDT) GB/T 19816.3-2005 Preparation of steel substrates before application of paints - Test methods for spray-cleaning metal abrasives - Part 3. Determination of hardness (ISO 11125-3.1993, IDT) GB/T 19816.4-2005 Preparation of steel substrates before application of paints. Test methods for spray-cleaning metal abrasives. Part 4. Determination of apparent density (ISO 11125-4.1993, IDT) GB/T 19816.5-2005 Preparation of steel substrates before application of paints. Test methods for spray-cleaning metal abrasives. Part 5. Defective particle percentage and microstructure determination (ISO 11125-5.1993, IDT) GB/T 19816.6-2005 Preparation of steel substrates before application of paints - Test methods for spray-cleaning metal abrasives - Part 6. Determination of Foreign Impurities (ISO 11125-6.1993, IDT) GB/T 19816.7-2005 Preparation of steel substrates before application of paints. Test method for spray-cleaning metal abrasives. Part 7. Determination of water content (ISO 11125-7.1993, IDT) 1) This standard is ISO 8504-2.1992 in ISO 11124-3.1993. GB/T 18839.2-2002 uses ISO 8504-2.2000 as a modification. ISO 439.1982 Determination of the total silicon content of steel and cast iron gravimetric method GB/T 18838.3-2008/ISO 11124-3.1993 ISO 629.1982 Determination of manganese content in steels and cast irons - Spectrophotometric method ISO 4935.1989 Determination of steel and iron-sulfur content Infrared absorption after combustion in induction furnaces ISO 9556.1989 Determination of the total carbon content of steel and iron. Infrared absorption after combustion in induction furnaces ISO 10714.1992 Determination of steel and iron phosphorus content Phosphorus vanadium molybdate spectrophotometric method

3 Definitions

The following definition applies to this part of GB/T 18838. 3.1 A blast-cleaning metal abrasive that melts high-carbon steel by atomizing a pelletized (see 3.3) cast processed product. 3.2 A blast-cleaning metal abrasive made by crushing sharp-edged horn particles of various sizes of high-carbon cast steel pellets. 3.3 The main shape is circular, its length is not more than twice the maximum particle width, and there are no edges, broken sections and other sharp surface defects particle. 3.4 The main shape is an angular shape, with a broken section and sharp edges, and the section size is smaller than half of the cross-section particles. 3.5 Abrasive cavities, shrinkage holes, cracks, or irregular shape of particles, if greater than or equal to the specified value, will be harmful to the abrasive performance (See Table 3). 3.5.1 The smooth surface of the inner hole, the area of not more than 10% of the cross-section of the inner hole. 3.5.2 Pores with a rough dendritic surface or microporous region, the area of which is not more than 40% of the cross-section of the particle. 3.5.3 Line-shaped non-continuous defects, having an aspect ratio of 3.1 or greater, a length exceeding 20% of the diameter or the minimum size of the particles, and being present Radial. 3.6 Non-magnetic, any material or particle that is not in the abrasive particles but is mixed in the abrasive.

4 Abrasive marking

High-carbon cast steel pellets and sand should be marked with "abrasive GB/T 18838" and the abbreviated letter "M/HCS" representing metallic high-carbon cast steel abrasive. The identification, followed by the label required to buy the pellet shape or sand grain symbol "S" or "G", the final mark indicates the required grade or particle mark Three digits of the size. If the hardness of the abrasive can be selected, the required particle Vickers hardness (HV) range should be specified. Example 1. Abrasive GB/T 18838M/HCS/S140 Said high-carbon steel-type metal abrasive, in line with the requirements of this part of GB/T 18838, the initial particle shape is pellets, grade is 140 (ie, the nominal particle size is GB/T 18838.3-2008/ISO 11124-3.1993 1.40mm). Example 2. Abrasive GB/T 18838M/HCS/G140/570-710HV Said high-carbon steel-type metal abrasive, in line with the requirements of GB/T 18838 of this part, the initial particle shape is grit, grade is 140 (ie, the nominal particle size is 1.40mm), hardness range from 570HV to 710HV. It is necessary to mark this complete product mark on the order form. Note 1. Table 1 and Table 2 show the grade requirements and code requirements. The grade code is an intermediate approximation or nominally straight representing a range of particle sizes for each grade. The number of the path is expressed in millimeters multiplied by 100. Note 2. Appendix A provides approximately equivalent grades and codes in other national standards commonly referenced for casting metallic abrasives.

5 Sampling

Sampling according to the provisions of GB/T 19816.1-2005.

6 Requirements for High Carbon Cast Steel and Sand Abrasives

The requirements for high-carbon cast steel pellets and sand abrasives are as specified in Table 3.

7 Packing and batch number signs

All supplies should be clearly marked and identified in accordance with Chapter 4. Sales units (such as containers, barrels, boxes, etc.) should clearly The complete product code label is affixed and, if possible, the hardness range. Subpackages (eg bags) should mark the shape and grade codes of the particles. Note. It is recommended that the packaging mark should include additional marks that can be traced to a specific product cycle or batch number, at least in containers, barrels or boxes, etc. Should include traceable signs.

8 Information Provided by Manufacturers and Suppliers

When necessary, the manufacturer or supplier shall provide a test report detailing the results of determining the relevant properties in accordance with the methods specified in Table 3. GB/T 18838.3-2008/ISO 11124-3.1993 Book . 7 . 0 . 3 . 8 . 3 . 0 . 7 . 4 . 1 . 0 . 8 . 7 . 6 . 5 . 4 . 3 . 3 00 . 2 . 1 . 1 S4 00 S3 00 S2 S2 S2 00 S1 S1 S1 S1 00 S0 S0 S0 S0 S0 , G B/ , but GB/T 18838.3-2008/ISO 11124-3.1993 Book . 8 . 3 . 0 . 7 . 4 . 1 . 0 . 8 . 7 . 6 . 5 . 4 . 3 . 3 00 . 2 . 1 . 1 . 0 . 0 G2 G2 00 G1 G1 G1 G1 00 G0 G0 G0 G0 G0 G0 , G B/ , but GB/T 18838.3-2008/ISO 11124-3.1993 Table 3 Performance requirements for high carbon cast steel pellets and sand abrasives Performance requirements test methods Grades are shown in Table 1 and Table 2 GB/T 19816.2-2005 hardness The hardness of 90% of the tested particles should be within one of the following ranges. Standard hardness. Pellets. 390HV to 530HV Sand grains. 390HV to 530HV 470HV～610HV 570HV～710HV ≥700HV Special hardness (pellets and grit). Other hardness ranges can be determined by the ordering party, but at least 90% of the particle hardness difference is within about 140HV. Abrasives sometimes contain recessive internal shrinkage defects or voids that exist beneath the polished sample surface. Holes, which will cause some uneven hardness indentations, giving an erroneous hardness reading. When testing, these readings should be discarded GB/T 19816.3-2005 Apparent density ≥ 7.0 × 103kg/m3 (7.0kg/dm3) GB/T 19816.4-2005 Defects (see 3.5) Particle shape a) Pellet b) Sand grains Cavity Shrinkage hole crack a) Pellet b) Sand grains Total amount of defects a) Pellet b) Sand grains The number of defective particles in the measured particles shall not exceed the following provisions. Non-spherical particles no more than 5% In sands with a hardness of not more than 700 HV, the number of pellets or more than hemispherical pellets does not exceed 10%, in the sand particles with a hardness greater than 700 HV, the number of pellets or particles exceeding the hemispherical shape is not exceeded Over 5% ≤10% ≤10% ≤15% ≤40% ≤20% ≤40% Particles with more than one of the above defects are counted only once in the total amount of defects GB/T 19816.5-2005 Foreign impurities (including Slag The mass fraction is not more than 1% GB/T 19816.6-2005 GB/T 18838.3-2008/ISO 11124-3.1993 Table 3 (continued) Performance requirements test methods Microstructure High-carbon cast steel and sand abrasives should have uniform martensitic and/or bainite microstructures and heat Treated to the same extent as the hardness, with fine and evenly distributed carbides. Due to high temperatures Transformation of formed products such as partial decarburization, network carbides, and dendritic grain boundary segregation of pearlite It is undesirable. The number of measured particles with this unwanted microstructure should not exceed 15% GB/T 19816.5-2005 chemical composition Carbon. 0.8% to 1.2% mass fraction Manganese. mass fraction 0.35% to 1.2% Silicon. mass fraction not less than 0.4% Sulfur. mass fraction not more than 0.05% Phosphorus. mass fraction not more than 0.05% The content of manganese should be high enough so that the cut surface hardness of all particles meets the requirements ISO 9556.1989 ISO 629.1982 ISO 439.1982 ISO 4935.1989 ISO 10714.1992 Water content The mass fraction is not more than 0.2% Note. It is important that high-carbon cast steel pellets and abrasives should be provided and used under dry conditions, and Should be stored in a dry indoor environment to prevent condensation, rust, and damage to the abrasive. It becomes unsuitable for use. GB/T 19816.7-2005 GB/T 18838.3-2008/ISO 11124-3.1993

Appendix A

(Informative Appendix) Approximate Equivalent Codes for Pellet and Sand Abrasives Generally referenced worldwide standards for abrasive metals are based on different particle size ranges and grade code systems. Table A. 1 lists the approximate equivalent codes in some national standards, and the right is the closest equivalent code in ISO 11124. The codes listed in the table are for reference only and should not be considered as equivalent to these levels. It covers the entire ISO 11124 code. Range. This section of ISO 11124 does not include all listed codes. The ISO 11124 size limit is the same as specified in SAEJ 444.1984. Table A. 1 SAEJ444.1984 BS2451.1963 DIN8201-2.1985 ISO code Pellets S1320 S1320 - S400 S1110 S1110 - S300 S930 S950 - S280 S780 S800 2.0 to 2.8 S240 S660 S660 1.6 to 2.24 S200 S550 S550 1.25 to 2.0 S170 S460 S470 - S140 S390 S390 1.0 to 1.6 S120 S330 S340 S280 - 0.8 to 1.25 S100 S080 S230 S240 0.6 to 1.0 S070 S170 S170 0.4～0.8 S060 S110 S120 0.3 to 0.6 S040 S70 S070 0.2-0.4 S030 Grit - G95 - - G10 G80 2.0 to 2.8 G240 G12 G66 1.6 to 2.24 G200 G14 G55 1.25 to 2.0 G170 G16 G47 1.0 to 1.6 G140 G18 G39 1.0 to 1.6 G120 G25 G34 0.8 to 1.25 G100 G40 G24/G17 0.6 to 1.0/0.4 to 0.8 G070 G50 G12 0.3 to 0.6 G050 G80 G07 0.2-0.4 G030 G120 G05 0.16 to 0.3 G020 G200 G02 0.1 to 0.2 G010 G325 G02 - G005 Note. "S" means pellets, ie round pellet shapes. "G" indicates grit, that is, angular particle shape. GB/T 18838.3-2008/ISO 11124-3.1993

Appendix B

(Informative Appendix) bibliography The following are commonly referenced standards for metal abrasives around the world. BS2451.1963 Specification for chilled cast iron pellets and sand DIN8201-1.1985 Abrasive Classification Method DIN8201-2.1985 Metallic abrasive cast iron pellets DIN8201-3.1985 Metal Abrasive Cast Iron Grit DIN8201-4.1985 Abrasive steel shot JISG5903. 1975 pellets and sand SAEJ444.1984 Shot Size and Specification of Shot Pellet and Sand Granules SAEJ827.1990 Cast Steel Pills SAEJ441.1987 Steel Cutting Pills GB/T 18838.3-2008/ISO 11124-3.1993 ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.

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