GB/T 18838.3-2008Preparation 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 (English PDF)

1 Scope

This Part of GB/T 18838 specifies the technical requirements for abrasive of 14 grades of high-carbon cast-steel shot and 12 grades of high-carbon cast-steel grit, as supplied for blast-cleaning processes. Values are specified for hardness, density, defect/structural requirements and chemical composition.

The requirements specified in this part of GB/T 18838 apply to abrasives supplied in the "new" condition only. They do not apply to abrasives either during or after use.

Test methods for metallic blast-cleaning abrasives are given in the various parts of

GB/T 19816.

High-carbon cast-steel shot and grit are used in both static and site blasting equipment.

They are most often selected where a facility exists for the recovery and re-use of the abrasive.

NOTE 1: Information on commonly referenced national standards for metallic abrasives and their approximate relationship with this Part is given in Appendix A and B.

NOTE 2: Although this Part of GB/T 18838 has been developed specifically to meet requirements for preparation of steelwork, the properties specified will generally be appropriate for use when preparing other material surfaces, or components, using blast-cleaning techniques. These techniques are described in ISO 8504-2:2000

1)

Preparation of Steel

1)

Such Standard is ISO 8504-2:1992 in ISO 11124-3:1993. GB/T 18839.2-2002 modified and adopted

ISO 8504-2:2000.

Substrates before Application· of Paints and Related Products - Surface Preparation Methods

- Part 2: Abrasive Blast-Cleaning.

2 Normative References

The provisions in following documents become the provisions of this Part of GB/T

18838 through reference in this Standard. For dated references, the subsequent amendments (excluding corrigendum) or revisions do not apply to this Standard, however, parties who reach an agreement based on this Standard are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies.

GB/T 19816.1-2005 Preparation of Steel Substrates before Application of Paints and Related Products - Test Methods for Metallic Blast-Cleaning Abrasives - Part

1: Sampling (ISO 11125-1:1993, IDT)

GB/T 19816.2-2005 Preparation of Steel Substrates before Application of Paints and Related Products - Test Methods for Metallic Blast-Cleaning Abrasives - 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 and Related Products - Test Methods for Metallic Blast-Cleaning Abrasives - Part

3: Determination of Hardness (ISO 11125-3:1993, IDT)

GB/T 19816.4-2005 Preparation of Steel Substrates before Application of Paints and Related Products - Test Methods for Metallic Blast-Cleaning 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 and Related Products - Test Methods for Metallic Blast-Cleaning Abrasives - Part

5: Determination of Percentage Defective Particles and of Microstructure (ISO

11125-5:1993, IDT)

GB/T 19816.6-2005 Preparation of Steel Substrates before Application of Paints and Related Products - Test Methods for Metallic Blast-Cleaning Abrasives - Part

6: Determination of Foreign Matter (ISO 11125-6:1993, IDT)

GB/T 19816.7-2005 Preparation of Steel Substrates before Application of Paints and Related Products - Test Methods for Metallic Blast-Cleaning Abrasives - Part

7: Determination of Moisture (ISO 11125-7:1993, IDT)

ISO 439:1982 Steel and Cast Iron - Determination of Total Silicon - Gravimetric

Method

ISO 629:1982 Steel and Cast Iron - Determination of Manganese Content -

Spectrophotometric Method

ISO 4935:1989 Steel and iron - Determination of Sulfur Content - Infrared

Absorption Method after Combustion in an Induction Furnace

ISO 9556:1989 Steel and Iron - Determination of Total Carbon Content - Infrared

Absorption Method after Combustion in an Induction Furnace

ISO 10714:1992 Steel and Iron - Determination of Phosphorus Content -

Phosphovanadomolybdate Spectrophotometric Method

3 Definitions

For the purpose of this Part of GB/T 18838, the following definitions apply.