HIGH CARBON CAST

STEEL SHOT AND GRIT

 

PRODUCT

High Carbon Cast Steel Shot & Grit are durable metal abrasives. Typical sieve analyses of these products are given in the following tables and gradation charts. Atmospherically controlled heat treatment and quench provide uniform microstructure and harness ranges for optimum durability.  Shot and Grit Abrasives are most frequently provided in a standard range of 40-51 Rockwell C. 

 

USES AND ADVANTAGES

Impact cleaning and de-scaling of ferrous or non-ferrous castings, forgings, steel mill products, weldments and heat treated metal products.

Shot peening to impart residual stresses, improving the fatigue properties of metal products.

Inspection of billet surfaces.

Rail cars, containers. Surface preparation for coating.

Ship building, structural steel fabrication, pipe and rebar. Surface preparation for coating.

Floor and deck restoration.

Surface preparation of fiberglass and other products.

Roll etching for steel mills, paper mills and other profile preparation.

Granite and marble cutting.

Bridge painting and restoration.

Core drilling.

Ballast and counterweights.

 

STANDARD PACKAGING

Palletized 55 gallon, non-returnable drums

Shot Packaging

      All sizes 2000 lbs net

Grit Packaging

      G10 – G16      1800 lbs net

      G18 – G40      1700 lbs net

      G50                  1600 lbs net

      G80 – G120      1500 lbs net

 

OPTIONAL PACKAGING

Palletized carton containing 40 – 50 lb multi-wall paper bags.

Bulk Bags packaged 4000 lbs net.

 

CHEMICAL ANALYSIS

Carbon                                          0.80 – 1.20%

Manganese

            HCS S70 – HCS S110   0.35 – 1.20%

            HCS S170                        0.50 – 1.20%

            HCS S230 and up           0.60 – 1.20%

Silicon                                           0.40% Minimum

Sulfur                                             0.05% Maximum

Phosphorous                                0.05% Maximum

The microstructure of high carbon cast steel shot shall be uniformly tempered martensite with fine, well-distributed carbides, if any. Carbide networks, transformation products, decarburized surfaces, inclusions, porosity and quench cracks are undesirable. 

DENSITY

High carbon cast steel shot shall not weigh less than 7 gm/cc nor contain more than 10% hollows. The method of determining density may be an alcohol displacement method, but for critical density measurements, a pycnometer method is recommended.

GENERAL APPEARANCE

High carbon cast steel shot shall be as nearly spherical as is commercially possible with a minimum of elongated or compound particles, tails, hollows, broken pieces, slag and dirt. 

HARDNESS

Ninety percent of the hardness checks performed on a representative sample shall fall within the range of Rockwell C 40 to 51 HRC. (This is S hardness shot and grit.) The hardness may be determined by any of the various methods applicable to small sections such as a Tukon Tester with Vickers indenter, at loads determined to provide a reliable conversion to Rockwell C. 

STEEL FOUNDERS’ SOCIETY OF AMERICA

20-66 Standard Specification for Cast Steel Abrasives

MICROSTRUCTURE

The microstructure of the abrasive shall consist of martensite tempered to a degree consistent with the hardness range. The presence of free ferrite or free graphite is unsatisfactory.

VOIDS

No more than 10% of cast steel abrasive particles shall contain voids as determined at 10X magnification. A void must be greater than 10% of the area of the abrasive to be considered harmful.

SHRINKAGE

No more than 10% of cast steel abrasive particles shall contain shrinkage as determined at 10X magnification. A shrinkage area must be greater than 40% of the area of the abrasive particle to be considered harmful.

CRACKS

No more than 15% of cast steel shop particles, and no more than 40% of cast grit particles, shall have cracks as determined at 10X magnification. A crack is a linear discontinuity whose length is greater than 3 time its width and greater than 20% of the diameter or shortest dimension of the abrasive particle.

PARTICLE SHAPE OF SHOT

When examined at 4X magnification, no more than 5% of the shot particles will have a length that is in excess of twice the cross section.

STEEL SHOT

Screen Opening Sizes and Screen Numbers with Max and Min Cumulative Percentages Allowed on Corresponding Screens

 

ASTM

Mesh

No.

Shot Number – SAE J444 Shot Tolerance

mm*

in.

S 1320

S 1110

S 930

S 780

S 660

S 550

S 460

S 390

S 330

S 280

S 230

S 170

S 110

S 70

4

4.75

0.187

All Pass

 

 

 

 

 

 

 

 

 

 

 

 

 

5

4.00

0.157

 

All Pass

 

 

 

 

 

 

 

 

 

 

 

 

6

3.35

0.132

90% min

 

All Pass

 

 

 

 

 

 

 

 

 

 

 

7

2.80

0.111

97% min

90% min

 

All Pass

 

 

 

 

 

 

 

 

 

 

8

2.36

0.0937

 

97% min

90% min

 

All Pass

 

 

 

 

 

 

 

 

 

10

2.00

0.0787

 

 

97% min

85% min

 

All Pass

All Pass

 

 

 

 

 

 

 

12

1.70

0.0661

 

 

 

97% min

85% min

 

5% max

All Pass

 

 

 

 

 

 

14

1.40

0.0555

 

 

 

 

97% min

85% min

 

5% max

All Pass

 

 

 

 

 

16

1.18

0.0469

 

 

 

 

 

97% min

85% min

 

5% max

All Pass

 

 

 

 

18

1.00

0.0394

 

 

 

 

 

 

96% min

85% min

 

5% max

All Pass

 

 

 

20

.850

0.0331

 

 

 

 

 

 

 

96% min

85% min

 

10% max

All Pass

 

 

25

.710

0.0278

 

 

 

 

 

 

 

 

96% min

85% min

 

10% max

 

 

30

.600

0.0234

 

 

 

 

 

 

 

 

 

96% min

85% min

 

All Pass

 

35

.500

0.0197

 

 

 

 

 

 

 

 

 

 

97% min

 

10% max

 

40

.425

0.0165

 

 

 

 

 

 

 

 

 

 

 

85% min

 

All Pass

45

.355

0.0139

 

 

 

 

 

 

 

 

 

 

 

97% min

 

10% max

50

.300

0.0117

 

 

 

 

 

 

 

 

 

 

 

 

80% min

 

80

.180

0.0070

 

 

 

 

 

 

 

 

 

 

 

 

90% min

80% min

120

.125

0.0049

 

 

 

 

 

 

 

 

 

 

 

 

 

90% min

200

.075

0.0029

 

 

 

 

 

 

 

 

 

 

 

 

 

 

J.I.S.

-----

-----

S 280

S 240

S 200

S 170

S 140

S 120

S 100

S 80

S 70

S 60

S 40

S 30

  •  Corresponds to ISO recommendations

STEEL GRIT

Screen Opening Sizes and Screen Numbers with Minimum Cumulative Percentages Allowed on Corresponding Screens

 

ASTM

Mesh

No.

Grit Number – SAE J444 Grit Tolerances

mm*

in.

G 10

G 12

G 14

G 16

G18

G 25

G 40

G 50

G 80

G 120

G 200

G 325

4

4.75

0.187

                  

 

    

5

4.00

0.157

                  

 

    

6

3.35

0.132

                        

7

2.80

0.111

All Pass

                      

8

2.36

0.0937

 

All Pass

                    

10

2.00

0.0787

80%

 

All Pass

                  

12

1.70

0.0661

90%

80% min

 

All Pass

                

14

1.40

0.0555

 

90% min

80% min

 

All Pass

              

16

1.18

0.0469

 

 

90% min

75% min

 

All Pass

            

18

1.00

0.0394

      

85% min

75% min

 

All Pass

          

20

.850

0.0331

                        

25

.710

0.0278

        

85% min

70% min

 

All Pass

        

30

.600

0.0234

                        

35

.500

0.0197

                        

40

.425

0.0165

          

80% min

70% min

 

All Pass

 

 

 

45

.355

0.0139

                  

 

 

 

50

.300

0.0117

            

80% min

65% min

 

All Pass

    

80

.180

0.0070

            

 

75% min

65% min

 

All Pass

 

120

.125

0.0049

                

75% min

60% min

 

All Pass

200

.075

0.0029

                  

70% min

55% min

 

325

.045

0.0017

                  

 

65% min

20%

J.I.S.

G 240

G 200

G 170

G 140

G 120

G 100

G 70

G 50

G 30

G 20

------

------

  • Corresponds to ISO recommendations

 

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