GB/T18838 "Technical requirements for metal abrasives for blast cleaning of steel surfaces before coating" is divided into four parts. This part is the third part of GB/T18838. This part specifies the technical requirements for 14 grades of high carbon cast steel shots and 12 grades of goose high carbon cast steel sand abrasives for blast cleaning, including hardness, density, defects and structural requirements and chemical composition. This part is only for unused abrasives and is not applicable to used abrasives. This part is equivalent to ISO11124-3:1993 "Technical requirements for metal abrasives for blast cleaning of steel surfaces before coating Part 3: High carbon cast steel shots and sand" (English version). GB/T 18838.3-2008 Technical requirements for metal abrasives for blast cleaning of steel surfaces before coating Part 3: High carbon cast steel shot and sand GB/T18838.3-2008 Standard download decompression password: www.bzxz.net
GB/T18838 "Technical requirements for metal abrasives for blast cleaning of steel surfaces before coating" is divided into four parts. This part is the third part of GB/T18838. This part specifies the technical requirements for 14 grades of high carbon cast steel shot and 12 grades of high carbon cast steel sand abrasives for blast cleaning, including hardness, density, defects and structure requirements and chemical composition. This part is only for unused abrasives and is not applicable to used abrasives. This part is equivalent to ISO11124-3:1993 "Technical requirements for metal abrasives for blast cleaning of steel surfaces before coating Part 3: High carbon cast steel shot and sand" (English version).
class="f14" style="padding-top:10px; padding-left:12px; padding-bottom:10px;"> GB/T18838 "Technical requirements for metallic abrasives for blast cleaning of steel surfaces before coating" is divided into the following parts:
--- Part 1: Guidelines and classification;
--- Part 2: Chilled cast iron sand;
--- Part 3: High carbon cast steel shot and sand;
--- Part 4: Low carbon cast steel shot;
--- Part 5: Steel wire segments. This part
is Part 3 of GB/T18838.
This part is equivalent to ISO11124-3:1993 "Technical requirements for metallic abrasives for blast cleaning of steel surfaces before coating Part 3: High carbon cast steel shot and sand" (English version).
This part is equivalent to ISO11124-3:1993.
For ease of use, the following editorial changes have been made to this part:
--- The term "this international standard" has been changed to "this part";
--- The comma used as a decimal point has been replaced by a decimal point.;
--- The comma used as a sub-statement has been replaced by a semicolon;
--- The title of Table 3 has been added;
--- The foreword of the international standard has been deleted.
Both Appendices A and B of this part are informative appendices.
This part was proposed by China State Shipbuilding Corporation.
This part is under the jurisdiction of the Technical Committee on Metal Surface Treatment and Painting Technology before Painting of the National Technical Committee on Standardization of Paints and Pigments. The
drafting units of this part are: China Shipbuilding Industry Comprehensive Technology and Economic Research Institute, China Shipbuilding Industry 11th Research Institute, Shandong Kaitai Metal Abrasive Co., Ltd., and Shandong University.
The main drafters of this part are Song Yanyuan, Liu Bingyang, Fu Jianhua, Liu Ruwei, Wang Ruiguo and Song Qingan.

The clauses in the following documents become the clauses of this part through reference in this part of GB/T 18838. For all dated referenced documents, all subsequent amendments (excluding errata) or revisions are not applicable to this part. However, the parties to the agreement based on this part are encouraged to study whether the latest versions of these documents can be used. For all undated referenced documents, the latest versions are applicable to this part.
GB/T19816.1-2005 Surface preparation of steel substrates before coating - Test methods for metallic abrasives for blast cleaning - Part 1: Sampling (ISO11125-1:1993, IDT)
GB/T19816.2-2005 Surface preparation of steel substrates before coating - Test methods for metallic abrasives for blast cleaning - Part 2: Determination of particle size distribution (ISO11125-2:1993, IDT)
GB/T19816.3-2005 Surface preparation of steel substrates before coating - Test methods for metallic abrasives for blast cleaning - Part 3: Determination of hardness (ISO11125-3:1993, IDT)
GB/T19816.4-2005 Preparation of steel substrates before coating - Test methods for metallic abrasives for blast cleaning - Part 4: Determination of apparent density (ISO11125-4:1993, IDT)
GB/T19816.5-2005 Preparation of steel substrates before coating - Test methods for metallic abrasives for blast cleaning - Part 5: Determination of percentage of defective particles and microstructure (ISO11125-5:1993, IDT)
GB/T19816.6-2005 Preparation of steel substrates before coating - Test methods for metallic abrasives for blast cleaning - Part 6: Determination of foreign matter (ISO11125-6:1993, IDT)
GB/T19816.7-2005 Preparation of steel substrates before coating - Test methods for metallic abrasives for blast cleaning - Part 7: Determination of water content (ISO11125-7:1993, IDT)

ICS 25. 220. 10
National Standard of the People's Republic of China
GB/T 18838.3—2008/ISO 11124-3: 1993 Preparation of steel substrates beforc application of paints and related producis-Specifications for netallic blast-cleaning abrasives-Part3:High-carbon cast-steel shot and grit(ISO 11124-3: 1993. IDT)
2008-04-01 Issued
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Small State Standardization Administration
2008-09-01 Implementation
GB/T 18838 "Surface treatment of steel materials before coating - Part 1: Guidelines and classification,
- Part 2: Chilled cast iron sand,
Part 3: High-strength cast steel and sand,
- Part 4: Low-carbon cast steel shot
- Part 5: Steel wire segments.
This part is the third part of G7 18838. Former
GB/T 18838.3-2008/1S0 11124-3: 1993 Technical Requirements for Metal Abrasives for Blasting Cleaning" is divided into the following parts: This part is equivalent to [S011124-3:1999 Technical Requirements for Metal Abrasives for Surface Treatment of Paint Pre-painting Materials
Part 1: High Phosphorus Cast Steel Shot and Sand (English version). This part is equivalent to 1S011124-3:1993
For ease of use, this part has made the following abbreviation changes: - the word "international standard" is changed to "this part", - the decimal point is replaced by ", the comma is replaced by ", the frequency symbol is replaced by ", " - the title of Table 3 is added, and the foreword of the international standard is excluded.
The appendixes A and B of this part are both informative appendices. This part is proposed by China State Shipbuilding Corporation. This part is under the jurisdiction of the National Technical Committee for Standardization of Paints and Pigments for Metal Surface Treatment and Painting Technology. This part was drafted by China Shipbuilding Industry Comprehensive Technology and Economic Research Institute, China Shipbuilding Industry First Research Institute, Shandong Kaitai Metal Abrasive Co., Ltd. Shandong University.
This part was drafted by Lai Yanyuan, Liu Bingyang, Bo Jianhua, Liu Ruwei, Wang Ruiguo, Song Qingan, G13
GB/T 18838.3—2008/1S0 11124-3:1993 Surface preparation of steel before coating
Technical requirements for metal abrasives for blast cleaning Part 3: High carbon cast steel shot and sand
Warning: For the abrasives, materials and equipment used for surface preparation, if they are not used carefully, they may be dangerous. Many countries have made regulations on materials and abrasives that are considered to be dangerous during use or after use (waste management), such as free silica, carcinogens or toxic substances. Therefore, these regulations should be followed. It is important to ensure that appropriate guidance is given and all required preventive measures are implemented. 1 Scope
This part of GB/T18838 specifies the technical requirements for one grade of high carbon cast steel shot and 12 grades of high hardness abrasive for blast cleaning, including hardness, density, defect and structure requirements and chemical composition. The requirements specified in this part of GB/T18838 are only applicable to unused abrasives and are not applicable to used abrasives. The test methods for abrasives for blast cleaning can be found in the various parts of GB/T19816. High carbon cast steel shot and abrasive are recyclable and reusable abrasives, which can be used in fixed or on-site blast cleaning equipment. Note: The standards of various countries in the world for metal materials that are usually referenced and their relationship with this part are shown in Appendix A and Appendix B. Note 2: Although this part of GB/T18838 is formulated for the surface treatment requirements of steel structures, the specified characteristics are generally also applicable to the surfaces or parts of other materials that are also treated by blast cleaning technology. These provisions have been given in 1508504-2:2000\"Surface treatment of steel before coating. Surface treatment methods, Part 2: Abrasive blast cleaning". 2 Normative references
The following documents have become clauses of this part through the reference of this part of B118838. For all dated references, all subsequent amendments (excluding errors) or revisions are not applicable to this part. However, parties to agreements based on this part are encouraged to study whether the latest versions of these documents can be used. For any unmarked referenced documents, the latest version shall apply to this part.
GB/T19816.1-2005 Surface preparation of silver materials before painting - Test method for metallic materials for blast cleaning - Part 1: Sampling (ISO 11125-1:19§3.1DT)
GBT19816.2-2005 Surface preparation of silver materials before painting - Test method for metallic materials for blast cleaning - Determination of particle size (ISO 11125-2:153, IDT) GB/T198[6.3-2005 Surface preparation of steel materials before painting - Test method for metallic materials for blast cleaning - Determination of hardness (ISO 11125-3:1993.!DT) GB/19816.4-2005 Surface preparation of steel materials before painting - Determination of hardness (ISO 11125-4:1994.!DT) GB/T 19816.5—2005 Surface treatment of steel before coating - Test method for metal abrasives for blast cleaning - Determination of percentage of defects and microstructure (ISO 125-5:1993.IDT) GB/T 19816.6—2005 Surface treatment of steel before coating - Test method for blast cleaning - Determination of foreign matter (ISO 125-6:193.1D) GB/T 19816.7—2005 Surface treatment of steel before coating - Test method for metal abrasives for blast cleaning - Determination of water content (ISO 125-5:1993.IDT) GB/T 19816.8—2005 Surface treatment of steel before coating - Test method for metal abrasives for blast cleaning - Determination of water content (ISO 125-6:193.1D) [1125-7,1993.IDT)[S0439:1982 Steel and iron Determination of total group content Gravimetric analysis method
Part 2:
Part 3:
Part 4:
Part 5:
Part 6:
Sub-part:
[This standard[SO 11:24-3:1991# is 1S0 8504-2:1992,GB/T [x39.2—2002 is modified and adopted[SO 8504 2:2000GB/T18838.3—2008/1S011124-3:1993IS0629:1982 Steel and iron
Determination of manganese content Spectrophotometric method
IS0 4935:19X9 Steel and iron
1S09556:1989 Steel and iron
Determination of sulfur content Infrared absorption method after combustion in an induction furnace Determination of total carbon content Infrared absorption method after combustion in an induction furnace JSO10714:1992 Determination of phosphorus content in steel and iron Phosphorus succinate spectrophotometric method 3 Definitions
The following definitions apply to this part of GB/T 18838. 3.1
High-carbon cast-steel shot A metal abrasive for blast cleaning, a granular product (see 3.3) obtained by atomizing molten high-carbon steel. 3.2
High-carbon cast-steel grit A metal abrasive for blast cleaning, a sharp-edged angular particle obtained by crushing high-carbon cast-steel shots of various sizes. 3.3
The main shape is convex, the ball length is not more than twice the maximum particle width, and there are no ridges, broken sections and other sharp surface defects.
The main shape is nubby. With broken sections and sharp edges, the section size is less than half of the cross section. 3.5
Defects
Void||The area of ​​the inner hole of the smooth surface is not more than 10% of the cross-sectional area of ​​the particle. 3.5.2
Shrinkage defer
An inner hole with a horizontal dendritic surface or a hole-making area, the surface area of ​​which is not more than 1% of the cross-sectional area of ​​the particle. 3.5.3
A linear discontinuity defect, with an aspect ratio of 3:1 or more, a length exceeding 20% ​​of the diameter or the smallest dimension of the particle, and in the form of a flare.
Foreign matter
Any material or particle that is non-abrasive and mixed with abrasive particles. 4
Abrasive marking
High carbon cast steel shot and sand should be marked with abrasive GB/T [8838\ and the abbreviation \M/HCS\ for metallic high phosphorus cast steel abrasive. Then mark the symbol "S\ or \G" indicating the particle shape required to be purchased as shot or sand, and finally mark the three-digit number indicating the required grade or particle size. If the hardness of the material can be selected, the required particle Vickers hardness (HV) range should be specified. GRT18838M/HCS/S140 indicates a high phosphorus cast steel type all-metal abrasive that complies with the safety requirements of this part of GBT18838. The initial particle shape is shot shaped and the grade is 140 (i.e. the particle nominal size is 21.40 mm).
Example 2:
Abrasive GB/T18838M/HCS/G140/570-710HV GB/T18838.3—2008/1S011124-3:1993 indicates high carbon cast steel type metal abrasive. It meets the requirements of this part of GB/T18838, the initial particle shape is sand, the grade is 140 (i.e. the nominal size is 1.40mm). The hardness range is 570HV~710HV. It is necessary to indicate this complete product mark on the order form. Note 1: Tables 1 and 2 give the grade requirements and code regulations. The grade code is a number representing the approximate middle value or special diameter of each grade particle size range, expressed as the average value multiplied by 100. Note 2: Appendix A provides approximately equivalent grades and codes in other national standards commonly referenced for cast metal materials. 5. Shaft samples
The samples shall be made in accordance with the provisions of GB/T19816.1-2005. Requirements for high carbon cast steel shot and sand abrasives
The requirements for high carbon cast steel shot and sand abrasives shall be in accordance with the provisions of Table 3. Packaging marks and batch number marksbzxZ.net
All supplies shall be clearly marked and identified in accordance with the provisions of Chapter 4. Sales units (except containers, plugs, boxes, etc.) shall be clearly labeled with complete product code labels, and if possible, the size range shall also be included. The sub-packaging (such as bags) shall be marked with the shape and grade code of the particles. It is recommended that additional marks that can be traced back to a specific product cycle or batch number should be included in the packaging marks such as containers, barrels or boxes.
8. Information to be provided by manufacturers and suppliers
When necessary, the manufacturer or supplier shall provide a test report, which shall list in detail the stations where the relevant properties were measured according to the methods specified in Table 3. 3
3—2008/1s011124-3:1993
GE/T 18838.3-
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-2008/1S0 11124-3:1993
GB/T18838.3-
GB/T18838.3-2008/IS011124-3:1993Table 3
Expression density
Missing figure (see 3.5)
Drive particle shadow
b) Sand grains
b) Sand grains
Total amount of defects
a) ) No particles
b) Sand particles
Other materials (including words
See Table 1 and Table 2
Performance requirements of high carbon cast steel shots and sand abrasives
90% The hardness of the measured particles should be within the following specified range: Standard grade
Shots: 390HV~530HV
Sand: 390HV-530HV
470 HV-610 HV
570 HV -710 HV
2700 HV
Special hardness (shot and sand): Other hardness ranges can be determined by the ordering party, but at least 90% of the particle hardness difference range is about 140HV. Abrasives sometimes contain some hidden internal shrinkage defects or cavities under the surface of the polished sample, which will cause some uneven hardness indentations and give an erroneous hardness reading. When testing, these readings should be discarded
>7.0×10 kg/m(7.0 kg/dm)
The number of defects in the tested particles shall not exceed the following provisions: The number of non-spherical particles shall not exceed 3%
In sand with a hardness not exceeding 700 HV, the number of pellets or particles that are more than spherical shall not exceed 10%. In sand with a hardness greater than 700 HV, the number of pellets or particles that are more than hemispherical shall not exceed 5%
≤10%
≤10%
≤20%
≤40%
For inspection with more than one of the above defects, only the number of defects with a mass fraction not exceeding 1% shall be counted in the total defects
Test method
GB/T 19816.2-2005
(1t/ 19916. 3- 2003
GB/T 19816. 4-2005
GB/T 1916.-2005
GB/T 19816.6 -2005
Metallurgy group
Chemical composition
Content
Pack 3 (continued)
6R/T18838.3--2008/IS011124-3:1993 Test method
High carbon gear steels and grit steels should have uniform martensite or tempered martensite. Tempered martensite is a microstructure, heat treated to a degree consistent with the hardness range, with fine and uniformly distributed carbides. Products formed by high temperature transformation, such as demagnetization of spheroidal carbides, network carbides and product boundary segregation are undesirable.
The number of measured particles with this undesirable microstructure should not exceed 15%
The mass fraction is 0.8%~2%
The mass fraction of manganese is 0.35%~1.2%
Silicon: the mass fraction is not less than 0.4%
Low: the mass fraction is not less than 0.05%
Accurate: the maximum mass fraction is not more than 0.05%
The total amount of storage should be high enough to make the cross-section hardness of all particles reach the SS
The maximum mass fraction is not more than 0.2%
It is important that high carbon steel and sand materials should be used in dry conditions and should be stored in indoor low temperature conditions to prevent the materials from solidifying, rusting, damaging, and becoming unsuitable for use.
GB/T 19816.#-3005
IS09556:1989
ISO 629:1982
ISO439:1982
ISO4935:1989
ISO10714:1992
GBT19816.J-7005
GBVT18838.3—2008/IS011124-3:1993 Scene A
(Informative Appendix)
Approximate effective codes for shot and grit abrasives
Usually referenced are the standards for metal abrasives in various countries around the world, which are based on different particle size ranges and grade code systems. Table A.1 lists the approximate equivalent codes in certain national standards, with the closest equivalent code in ISO III 24 to the right. The codes listed in the table are for reference only and should not be considered to represent equivalent grades. They represent the entire range of ISO III 24 codes. This part of ISO III 24 does not cover all the codes listed. The ISO III 24 size limits are the same as those specified in SAE J 444: 1984. Table A.1
SAE J 444: 1984
Summary: -S\ indicates pellets, i.e., uniform particle shape. \G\ indicates sand, i.e., angular particle shape. 8
ES2451:1963
G24/G17
DEN8201-2:1985
1.25--2.0
0.6~1.0/0.4-0.5
ISO code
Appendix B
(Informative Appendix)
Reference Books
The following are the commonly used standards for metal abrasives from various countries in the world: BS 2451:1963
Specification for chilled cast iron shot and sand
nIN 8201-I: 1985
DIN 8201-2:1985
DIN 8201-3 :1985
DIN 820-4;1985
J1S G5903:1975
SAE J444 :1984
SAF J827:1990
SAE J44I: 1987
Material classification
, expression method
Metal abrasives
Cast iron abrasives
Metal abrasives
Chrome iron abrasives
Abrasive copper shot
Cast shot and sand
Cast steel shot and sand for jetting
Wire cut shot
GB/T 18838.3—2008/IS0 11124-3:19939
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