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IS 9954:1981 is the Indian Standard (BIS) for steel abrasives for blast cleaning - specification. This standard specifies the requirements for steel shot and grit abrasives used in blast cleaning operations for surface preparation. It covers material composition, hardness, size grading, shape, soundness, and testing methods to ensure the quality and performance of the abrasive media.
Specifies requirements for steel abrasives (shot and grit) used for blast cleaning of surfaces prior to painting or coating.
Overview
Status
Current
Usage level
Specialized
Domain
Materials Science — Painting, Coatings and Surface Finishing
! The choice between shot (round) and grit (angular) depends on the desired surface profile and cleaning action. Shot provides a peening effect, while grit provides an etching effect for better coating adhesion.
! Recycling of steel abrasives is common and economical, but it is crucial to monitor the operating mix for size, shape, and contaminants to maintain cleaning efficiency.
! Hardness is a critical factor; softer abrasives clean slower but have lower breakdown rates, while harder abrasives clean faster but can be brittle and may cause excessive stress in thin substrates.
ISO 11124-3:2018ISO - International Organization for Standardization
HighCurrent
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
Specifies requirements for high-carbon cast-steel shot and grit, including chemical composition, hardness, density, and size distribution.
SAE J444:2018SAE International - USA
HighCurrent
Cast Shot and Grit Size Specifications for Peening and Cleaning
Defines the standard sizing and screening specifications for cast steel shot and grit, which is a primary component of IS 9954.
SAE J827:2015SAE International - USA
MediumCurrent
Cast Steel Shot
Covers material requirements such as hardness, microstructure, and chemistry for cast steel shot, overlapping significantly with IS 9954's material clauses.
SSPC-AB 3:2019SSPC (The Society for Protective Coatings) / AMPP - USA
MediumCurrent
Ferrous Metallic Abrasive
Sets requirements for new and recycled ferrous metallic abrasives for blast cleaning, frequently referencing SAE standards for properties.
Key Differences
≠IS 9954 uses a size designation where the number indicates the nominal particle size in microns (e.g., S-330 is ~0.33 mm). SAE J444 uses a similar numbering (e.g., S330) but it represents a different, much larger nominal size (~0.85 mm).
≠IS 9954 specifies a single standard hardness range (e.g., 390-530 HV for shot). International standards like ISO 11124-3 and SAE J1993 offer multiple hardness grades (e.g., GP, GL, GH) to suit different applications.
≠For impurities, IS 9954 specifies separate limits for Sulphur (S ≤ 0.05%) and Phosphorus (P ≤ 0.05%). ISO 11124-3 is stricter, specifying a combined limit (S + P ≤ 0.05%).
≠The durability test method described in IS 9954 (Appendix B) uses a specific ball mill apparatus, whereas international standards typically reference tests using machines that more closely simulate actual blasting, like the Ervin or SAE test machine.
Key Similarities
≈All standards specify high-carbon cast steel as the fundamental material for manufacturing the abrasive shot and grit.
≈Both IS 9954 and its international counterparts (ISO 11124-3, SAE J827) specify a minimum density requirement, typically around 7.0 g/cm³.
≈All compared standards mandate that the abrasive must be substantially free of contaminants like sand, slag, rust, oil, and moisture.
≈The fundamental methodology of using a stack of sieves for particle size analysis to ensure compliance with size distribution tables is common across IS 9954, ISO 11124-3, and SAE J444.
≈For steel shot, all standards require a predominantly spherical or rounded shape and set limits on the percentage of misshapen, cracked, or hollow particles.
Parameter Comparison
Parameter
IS Value
International
Source
Hardness (Standard Shot)
390 - 530 HV
40 - 51 HRC (approx. 392 - 525 HV)
SAE J827:2015
Density
≥ 7.0 g/cm³
≥ 7.0 g/cm³ (apparent density)
ISO 11124-3:2018
Carbon (C) Content
0.85 - 1.20%
0.80 - 1.20%
ISO 11124-3:2018
Sulphur (S) + Phosphorus (P) Content
S ≤ 0.05%; P ≤ 0.05% (Separate)
S + P ≤ 0.05% (Combined)
ISO 11124-3:2018
Manganese (Mn) Content
0.60 - 1.20%
0.35 - 1.20%
ISO 11124-3:2018
Microstructure
Fine, well-tempered martensite with a controlled network of carbides.
Tempered martensite and/or bainite, substantially free of massive carbides.
ISO 11124-3:2018
Size Designation Example
S-330 (Nominal size 0.33 mm)
S330 (Nominal size 0.85 mm)
SAE J444:2018
Sieve Requirement Example
For S-330, 85% min. retained on 0.30 mm sieve.
For SAE S330, 85% min. retained on 0.85 mm sieve.
SAE J444:2018
⚠ Verify details from original standards before use
Key Values7
Quick Reference Values
Carbon Content Range0.85-1.20 %
Manganese Content Range0.60-1.20 %
Silicon Content (Min)0.40 %
Sulphur and Phosphorus Content (Max each)0.05 %
Regular Grade Hardness40 to 50 HRC
Special Hardness Grade H56 to 62 HRC
Minimum Density7.0 g/cm³
Tables & Referenced Sections
Key Tables
Table 1 - Size Grading Requirements for Steel Shot
Table 2 - Size Grading Requirements for Steel Grit