1、4-11SSPC-AB 3February 1, 2003Editorial Revisions November 1, 20041ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959; http:/www.astm.org1. Scope1.1 This specifi cation covers the requirements for ferrous metallic abrasive for the removal of rust, mill scale, paint, or other
2、surface coating system by blast cleaning.1.2 This specifi cation covers previously unused abrasive material. It does not address cleanliness of recycled abrasive processed through fi eld or shop abrasive blast cleaning units. Requirements for recycled ferrous metallic abrasive is covered in SSPC-AB
3、2.2. Description and Use2.1 Ferrous metallic abrasive can have two basic particle shapes: (1) spherical or round for shot; and (2) angular or ir-regular for grit, as defi ned in Sections 4.1.3.1 and 4.1.3.2.2.2 The size designations and specifi cations for shot and grit are given in Tables 1 and 2 (
4、see Note 7.2).2.3 ABRASIVE CLASS: Ferrous metallic abrasive is divided into two classes.2.3.1 Class 1 Steel Abrasive: Steel abrasive is char-acterized by low carbon content. Steel abrasive is not as hard as iron abrasive, and hence is more durable.2.3.2 Class 2 Iron Abrasive: Iron abrasive is charac
5、ter-ized by high carbon content and hardness typically over 55 Rc. The particle shape requirements for iron grit are less stringent than those for steel grit. 2.4 ABRASIVE SELECTION: The owner/specifi cation writer may defi ne the abrasive class, shape, size, and hard-ness to meet the job requiremen
6、ts. 3. Referenced Standards3.1 The latest issue, revision, or amendment of the ref-erenced standards in effect at the time of the bid solicitation shall govern, unless otherwise specifi ed. 3.2 If there is a confl ict between the requirements of any of the cited reference standards and this specifi
7、cation, the requirements of this specifi cation shall prevail.3.3 SSPC STANDARDAB 2 Cleanliness of Recycled Ferrous Metallic Abrasive3.4 ASTM INTERNATIONAL STANDARDS1C 128 Test Method for Density and Relative Density (Specifi c Gravity) and Absorption of Fine AggregateC 136 Test Method for Sieve Ana
8、lysis of Fine and Coarse AggregatesD 4940 Test Method for Conductimetric Analysis of Water-Soluble Ionic Contamination of Blasting AbrasivesE 11 Specifi cation for Wire-Cloth and Sieves for Testing PurposesE 350 Test Methods for Chemical Analysis of Car-bon Steel, Low-Alloy Steel, Silicon Electrical
9、 Steel, Ingot Iron, and Wrought IronE 384 Test Method for Microindentation Hard-ness of MaterialsE 1019 Test Methods for Determination of Car-bon, Sulfur, Nitrogen, and Oxygen in Steel and in Iron, Nickel, and Cobalt Alloys3.5 SOCIETY OF AUTOMOTIVE ENGINEERS (SAE) STANDARD2J444 Cast Shot and Grit Si
10、ze Specifi cations for Peening and Cleaning4. Requirements4.1 PHYSICAL PROPERTIES4.1.1 Size Classifi cation: The abrasive shall be tested in accordance with Section 5.2.1 and shall meet the size require-ments for each size specifi ed as defi ned in Table 1 for shot or Table 2 for grit.4.1.2 Hardness
11、: Abrasive hardness shall be tested in accordance with Section 5.2.4 and shall meet the specifi ed hardness requirements (see Notes 7.2 and 7.3).4.1.3 Particle Shape (see Note 7.4)SSPC: The Society for Protective CoatingsABRASIVE SPECIFICATION NO. 3Ferrous Metallic Abrasive4-12SSPC-AB 3February 1, 2
12、003Editorial Revisions November 1, 2004TABLE 1METALLIC SHOT SIZE SPECIFICATIONS* Screen opening sizes and screen numbers with maximum and minimum culmulative percentages allowed on corresponding screens. NOTE: These sizes correspond to those in SAE J444 Cast Shot and Grit Size Specifications for Pee
13、ning and Cleaning.* All percentages refer to weight percent.7 0.1110 2.80 all pass 8 0.0937 2.36 all pass 10 0.0787 2.00 85% min.* all pass all pass 12 0.0661 1.70 97% min 85% min. 5% max. all pass 14 0.0555 1.40 97% min. 85% min 5% max. all pass 16 0.0469 1.18 97% min 85% min. 5% max. all pass 18 0
14、.0394 1.00 96% min. 85% min. 5% max. all pass 20 0.0331 0.850 96% min. 85% min. 10% max. all pass 25 0.0278 0.710 96% min. 85% min. 10% max. 30 0.0234 0.600 96% min. 85% min. all pass 35 0.0197 0.500 97% min. 10% max. 40 0.0165 0.425 85% min. all pass45 0.0139 0.355 97% min. 10% max.50 0.0117 0.300
15、80% min. 80 0.0070 0.180 90% min. 80% min.120 0.0049 0.125 90% min.Screen NoASTM E 11Screen Opening(inches)*Screen Opening (mm)*SHOT SIZE230660550460390280170110703307804-13SSPC-AB 3February 1, 2003Editorial Revisions November 1, 20044.1.3.1 Shot: Using 10X magnifi cation, shot shall be pre-dominant
16、ly rounded particles with no more than 10% elongated particles for steel abrasive and no more than 30% elongated particles for iron abrasive. (An elongated particle is one with a length more than twice its diameter.)Also see Note 7.44.1.3.2 Grit: Using 10X magnifi cation, grit shall be irregular or
17、angular shaped particles with no more than 10% round or half-round particles for steel abrasive and no more than 25% round or half-round particles for iron abrasive (also see Note 7.4).4.1.4 Specifi c Gravity: When tested in accordance with Section 5.2.2, the specifi c gravity of the abrasive shall
18、be no less than 7.0 for steel abrasive and no less than 6.8 for iron abrasive.4.1.5 Durability: Metallic abrasive is tested for durability in accordance with Section 5.2.5.4.1.5.1 Steel: After 100 cycles in the durability test, no more than 20% by weight of a steel abrasive shall pass through the ap
19、propriate take-out screen as defi ned in Table 3 for grit or in Table 4 for shot (see Note 7.5).4.1.5.2 Iron: After 50 cycles in the durability test, no more than 50% by weight of an iron abrasive shall pass through the appropriate take-out screen as defi ned in Table 3 for grit or in Table 4 for sh
20、ot (see Note 7.5).4.2 PROPERTIES4.2.1 Chemistry: When tested in accordance with Section 5.2.3, the chemical composition of the abrasive shall conform to the requirements in Table 5.4.2.2 Conductivity: When tested in accordance with Section 5.2.7, the conductivity of the solution of water-soluble con
21、taminants shall not exceed 1000 microsiemens per centi-meter (S/cm). (1 S/cm = 1 mho/cm)4.2.3 Cleanliness: When tested in accordance with Section 5.2.6, the abrasive shall be free of dust, oil, grease, corrosion, and non-magnetic matter subject to the limitations in Sections 4.2.3.1 and 4.2.3.2, and
22、 other contaminants. The presence of rust in excess of a slight red or blue oxidation of the abrasive particle shall be cause for rejection.4.2.3.1 Accept: If the sample has 0.2 percent or less by weight of non-magnetic matter and no oil fi lm or slick on the surface of the water, it is considered c
23、lean. Clouding or dis-coloration of the water is not grounds for rejection.4.2.3.2 Reject: If the sample has more than 0.2 percent by weight of non-magnetic matter and/or has an oil fi lm or slick on the surface of the water and sides of the container, it must be rejected.2 Society of Automotive Eng
24、ineers, 400 Commonwealth Drive, Warrentdale PA 15096-0001; http:/www.sae.orgTABLE 2METALLIC GRIT SIZE SPECIFICATIONS8 0.0937 2.36 all pass 10 0.0787 2.00 all pass 12 0.0661 1.70 80%* all pass 14 0.0555 1.40 90% 80%* all pass 16 0.0469 1.18 90% 75% all pass 18 0.0394 1.00 85% 75% all pass 25 0.0278 0
25、.710 85% 70% all pass 40 0.0165 0.425 80% 70% all pass 50 0.0117 0.300 80% 65% all pass80 0.0070 0.180 75% 65% 120 0.0049 0.125 75% 60%200 0.0029 0.075 70%Screen Opening ASTM E 11Screen Opening (inches)*Screen Opening (mm)* G 12 G14 G16 G18 G25 G40 G50 G80 G120Grit Size* Screen opening sizes and scr
26、een numbers with maximum and minimum culmulative percentages allowed on corresponding screens. NOTE: These sizes correspond to those in SAE J444.* All percentages refer to weight percent.4-14SSPC-AB 3February 1, 2003Editorial Revisions November 1, 20045. Quality Assurance Test Methods5.1 RESPONSIBIL
27、ITIES FOR TESTING: Unless other-wise specifi ed, the supplier is responsible for performing and documenting the preliminary acceptance tests and inspections called for in this specifi cation. The procurement documents should establish the specifi c responsibilities for conformance testing. 5.2 TEST
28、PARAMETERS: Unless otherwise specifi ed in the contract or purchase order, the supplier shall be responsible for compliance with the requirements for class, size, specifi c gravity, chemical composition, hardness, durability, cleanliness, and conductivity. 5.2.1 Size: The abrasive sizing shall be te
29、sted in accor-dance with ASTM C 136.5.2.2 Specifi c Gravity: Specifi c gravity shall be determined in accordance with ASTM C 128.5.2.3 Chemical Composition: Chemical composition shall be determined in accordance with ASTM E 1019 for carbon content and ASTM E 350 for manganese and phosphorus content.
30、5.2.4 Hardness: Hardness values shall be obtained and converted to Rockwell C equivalents in accordance with ASTM E 384 utilizing a microhardness tester with a 500 g load.5.2.4.1 Metallic abrasive sometimes contains internal shrinkage, voids, or inclusions, which remain undetected be-neath the surfa
31、ce in a mounted and polished sample. These characteristics can cause a non-uniform hardness reading and shall be ignored when testing for hardness.5.2.5 Durability Test Procedure5.2.5.1 Procedure1. Obtain a representative sample and weigh out 100 grams ( 0.1 g) of new abrasive.2. Place a 100 g sampl
32、e in a calibrated standard durability test machine (see Section 5.2.5.2) and run a steel abrasive for 100 cycles and an iron abrasive for 50 cycles.3. Remove the sample from the test machine and hand screen the sample on the appropriate take-out screen (see Table 3 for grit; Table 4 for shot). Recor
33、d the weight of the sample remaining on the screen after hand screening is completed.5.2.5.2 Apparatus: Durability tests shall be performed us-ing an Ervin Test Machine3or equivalent shot/grit test machine, properly calibrated in accordance with the manufacturers instructions.TABLE 3METALLIC GRIT TA
34、KE-OUT SCREENSGrit SizeSteel Take-Out Screen SizeIron Take-Out Screen SizeG12G14G16G18G25G40G50*G80*G120*40 mesh40 mesh40 mesh40 mesh50 mesh50 mesh70 mesh*40 mesh40 mesh40 mesh40 mesh50 mesh50 mesh80 mesh* Abrasive sizes G50, G80 and G120 cannot be accurately tested due to limitations of the test ap
35、paratus in retaining fi ne abra-TABLE 4METALLIC SHOT TAKE-OUT SCREENSShot Size Steel Take-Out Screen SizeIron Take-Out Screen SizeS780S660S550S460S390S330S280S230S170S110*S70*40 mesh40 mesh40 mesh40 mesh40 mesh50 mesh50 mesh50 mesh50 mesh70 mesh*40 mesh40 mesh40 mesh40 mesh40 mesh50 mesh50 mesh50 me
36、sh70 mesh80 mesh* Shot sizes S110 and S70 cannot be accurately tested due to limitations of the test apparatus in retaining these sizes.TABLE 5ABRASIVE CHEMISTRYElementSteel Percent by Weight*IronPercent by Weight* Percentages only refl ect two signifi cant fi gures.CarbonManganesePhosphorus1.5%, ma
37、ximum1.2%, maximum0.05%, maximum1.6%, minimumN/AN/A4-15SSPC-AB 3February 1, 2003Editorial Revisions November 1, 20043 Ervin Test Machines are available (for purchase or as loaners) from Ervin Industries, Inc. at 3893 Research Park Drive, Ann Arbor, MI 48108; phone (800) 748-0055 or (734) 769-4600; f
38、ax (734) 663-0136; E-mail: 5.2.6 Abrasive Cleanliness1. Obtain a representative sample.2. Weigh out 100 grams 1 gram.3. Magnetically remove all magnetic material.4. Weigh remaining non-magnetic material and record weight.5. Check magnetic material for rust in excess of slight red or blue oxidation.6
39、. Recombine magnetic and non-magnetic material in a glass jar and cover with at least one inch of potable water.7. Vigorously shake the jar containing water and recombined material.8. After shaking, observe water surface in jar as described in Sections 4.2.3.1 and 4.2.3.2.5.2.7 Conductivity: Conduct
40、ivity tests shall be run in accordance with ASTM D 4940.6. Disclaimer6.1 While every precaution is taken to ensure that all information furnished in SSPC standards and specifi cations is as accurate, complete, and useful as possible, SSPC cannot assume responsibility nor incur any obligation resulti
41、ng from the use of any materials, coatings, or methods specifi ed herein, or of the specifi cation or standard itself.6.2 This specifi cation does not attempt to address problems concerning safety associated with its use. The user of this specifi cation, as well as the user of all products or practi
42、ces described herein, is responsible for instituting appropriate health and safety practices and for ensuring compliance with all governmental regulations.7. NotesNotes are not requirements of this specifi cation.7.1 ABRASIVE PRODUCTIVITY: For greatest productivity, always use the fi nest size abras
43、ive that will effectively clean the surface and produce the proper profi le. Abrasive recycling machines should be set to retain all usable abrasive sizes in the working mix for maximum productivity and lowest abrasive consumption. Productivity is directly affected by such variables as particle size
44、, shape, number of particles, velocity, distance, and angle of attack, and hardness of the surface being cleaned. There is a maximum abrasive fl ow rate that provides highest productivity. Increasing the abrasive fl ow beyond the critical rate usually reduces productivity. 7.2 ABRASIVE HARDNESS: Abr
45、asive hardness may af-fect the performance of ferrous metallic abrasive as follows:51 Rcand higher hardness Increasing hardness increases the cutting rate compared to abrasive with hardnesses below 51 Rc(hardness of 51 on the Rockwell C scale), particularly when removing live (i.e., soft, fl exible)
46、 coating systems. Increasing hardness increases the surface profi le com-pared to abrasive with hardnesses below 51 Rc. Increasing hardness lowers the durability and increases abrasive consumption compared to abrasive with hard-nesses below 51 Rc.RC50 and lower hardness Good cutting rate for new ste
47、el and most coating sys-tems Lower profi le compared to abrasive with hardnesses of 51 Rcand higher. Higher durability but greater tendency to rounding compared to abrasive with hardnesses of 51 Rcand higher.7.3 ABRASIVE CHANGE WITH USE: With use, abrasive hardness, particle size, and particle shape
48、 will vary depend-ing on initial hardness, blasting velocity, and blasting method. Abrasive hardness may increase with continued reuse. Abrasive size will decrease with continued reuse. Because of change in hardness, shape, and size, it is important that new abrasive is added to the work mix on a regular basis to ensure quality and consistency of blast profi le and cleanliness.7.4 ABRASIVE SHAPE: Abrasive shape may affect the profi
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