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This document is developed in accordance with the rules given in GB/T 1.1-2020 Directives for standardization — Part 1: Rules for the structure and drafting of standards.
This document replaces GB/T 2480-2008 Conventional abrasive -Silicon carbide. In addition to structural adjustments and editorial changes, the following main technical changes have been made with respect to GB/T 2480-2008:
a) the scope has been modified (see Clause 1; Clause 1 of 2008 edition);
b) the designation has been modified (see Clause 4; Clause 3 of 2008 edition);
c) the chemical composition index has been modified Denotation (see 5.1; 4.1 of 2008 edition);
d) the density index has been modified (see 5.3, 4.2 of 2008 edition);
e）the magnetic content index has been modified (see 5.5, 4.5 of 2008 edition);
e) the content of J series abrasive micro-powder has been added (see 5.1, 5.3 and Table 3);
g) the marking, transport and storage requirements have been added (see Clause 8).
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing agency of this document shall not be held responsible for identifying any or all such patent rights.
This document was proposed by the China Machinery Industry Federation.
This document is under the jurisdiction of the National Technical Committee for Standardization of Abrasive Tools (SAC/TC 139).
The previous editions of documents replaced by this standard are as follows:
--GB 2480-198, GB 2480-1983, GB/T 2480-1996, GB/T 2480-2008.
Contents
Foreword i
1 Scope 2
2 Normative References 2
3 Terms and Definitions 3
4 Designations 3
5 Technical requirements 3
6 Test methods 5
7 Inspection rules 5
8 Packaging, marking, transportation and storage 6
Conventional abrasive-Silicon carbide
1 Scope
This document specifies the designations, technical requirements, test methods, inspection rules, packaging, marking, transportation and storage of silicon carbide abrasives.
This document applies to the manufacture of silicon carbide abrasives for making bonded and coated abrasive tools and for free grinding, polishing and cutting purposes.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 2481 (all parts) Abrasives for bonded abrasives - Detection and marking of grain size composition
GB/T 3045 (all parts) Conventional abrasives - Chemical analysis method of silicon carbide
GB/T 4676 Conventional abrasives - Sampling Method
GB/T 9258 (all parts) Abrasives for coated abrasives - Grain size analysis
JB/T 6569 Conventional abrasives - Packaging
JB/T 6570 Conventional abrasives - Determination method of magnetic content
JB/T11433 Determination of the density of conventional abrasives
3 Terms and Definitions
No terms and definitions are listed in this standard.
4 Designations
The designations of silicon carbide abrasives are specified as follows:
——the designation of black silicon carbide for ceramic bonded abrasives, coated abrasives and free grinding, polishing and cutting is C;
——the designation of green silicon carbide for ceramic bonded abrasives, coated abrasives and free grinding, polishing and cutting is GC;
——the designation of black silicon carbide for bonded abrasives with organic bond is C-B;
——the designation of green silicon carbide for bonded abrasives with organic bond is GC-B.
5 Technical requirements
the designation of green silicon carbide for bonded abrasives with organic bond is GC-B.
5.1 Chemical compositions
The chemical composition of product of each designation shall meet the requirements in Table 1.
1 Chemical compositions
Designation Grain size range Chemical composition (mass fraction)/%
SiC
≥ F.C.
≤ Fe2O3
≤
C F4~F90 P12~P100 98.80 0.15 0.15
F100~F150 P120~P150 98.50 0.20 0.20
F180~F220 P180~P220 98.30 0.25 0.25
F230~F280(J240~J360) P240~P360 98.30 0.25 0.25
F320~F500(J400~J800) P400~P1000 98.10 0.25 0.30
F600~F800(J1000~J1500) P1200~P1500 97.80 0.25 0.30
F1000~F1200(J2000~J2500) P2000~P2500 97.50 0.25 0.30
J3000~J8000 — 96.00 0.25 0.30
GC F4~F90 P12~P100 99.20 0.15 0.15
F100~F150 P120~P150 98.80 0.20 0.20
F180~F220 P180~P220 98.40 0.20 0.20
F230~F280(J240~J360) P240~P360 98.40 0.20 0.25
F320~F500(J400~J800) P400~P1000 98.20 0.20 0.30
F600~F800(J1000~J1500) P1200~P1500 98.00 0.20 0.30
F1000~F1200(J2000~J2500) P2000~P2500 97.60 0.20 0.30
J3000~J8000 — 96.50 0.20 0.30
C-B F4~F90 — 98.50 0.20 0.20
F100~F150 — 98.10 0.20 0.25
F180~F220 — 97.50 0.25 0.30
F230~F280(J240~J360) — 97.50 0.25 0.30
F320~F500(J400~J800) — 97.00 0.30 0.40
F600~F800(J1000~J1500) — 96.50 0.30 0.40
F1000~F1200(J2000~J2500) — 96.00 0.30 0.40
J3000~J8000 — 95.60 0.40 0.45
GC-B F4~F90 — 99.10 0.20 0.20
F100~F150 — 98.60 0.20 0.25
F180~F220 — 98.00 0.25 0.30
F230~F280(J240~J360) — 98.00 0.25 0.30
F320~F500(J400~J800) — 97.50 0.30 0.35
F600~F800(J1000~J1500) — 97.00 0.30 0.35
F1000~F1200(J2000~J2500) — 96.50 0.30 0.40
J3000~J8000 — 96.20 0.40 0.40
5.2 Grain size distribution
The grain size distribution of abrasives used for bonded abrasives and free grinding, polishing and cutting shall comply with the provisions of GB/T 2481 (all parts).
The grain size distribution of abrasives for coated abrasives shall comply with GB/T 9258 (all parts).
5.3 Density
The density of F220 (P220) and black silicon carbide with the coarse grain size number shall not be less than 3.15 g/cm3.The density of green silicon carbide shall not be less than 3.20 g/cm3.
The density of F230 (J240, P240) and black silicon carbide with fine grain size number shall not be less than 3.13 g/cm3.The density of green silicon carbide shall not be less than 3.18 g/cm3.
Foreword i
1 Scope
2 Normative References
3 Terms and Definitions
4 Designations
5 Technical requirements
6 Test methods
7 Inspection rules
8 Packaging, marking, transportation and storage
