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STEEL SHOT
Steel Shots
Steel shots are spherical grains made of molten steel through an atomization (granulation) process; these cast steel shots are available in different sizes & hardness. Steel shots are manufactured from steel scrap. Our furnace is electric furnace. Steel scrap is melted in the furnace then being atomized into shot by water jet.

Cast Steel shots manufacturing process:
  1. Melting ( steel scrap + alloy)
  2. Atomizing (by high pressure water jet)
  3. Drying
  4. Screening (separate the SAE shot size from the oversized shot particles used for grit production)
  5. Spiraling (remove irregular shaped shot)
  6. Quenching (produce superior particle integrity with minimal stress cracks)
  7. Tempering
  8. Screening
  9. Packaging (25 KGS per one small pp bag)
Our Steel Shot is exceptionally durable – due to its low friability, the impact of blasting actually further tempers the shot so that its hardness increases over time, allowing the media to deliver consistent, repeatable performance over thousands of cycles. As produced, our Steel Shot has a hardness of 40-50HRC (390-510 H.V). And thanks to its extremely low breakdown rate, virtually no dust is produced. Delivering high-impact energy and fast cleaning rates, Steel Shot is used to for heavy scouring and to produce very bright finishes

Table of various diameters of cast steel shots

Steel shot-930

  85% min 97% min                    

---

2.8

6

7

Steel shot-780

all pass   85% min 97% min                  

ss-2000

2

8

10

Steel shot-660

  all pass   85% min 97% min                

ss-1700

1.7

10

12

Steel shot-550

    all pass   85% min 97% min              

ss-1400

1.4

12

14

Steel shot-460

    all pass 5% max   85% min 96% min            

ss-1180

1.2

14

16

Steel shot-390

      all pass 5% max   85% min 96% min          

ss-1000

1.0

16

18

Steel shot-330

        all pass 5% max   85% min 96% min        

ss-850

0.85

18

20

Steel shot-280

          all pass 5% max   85% min 96% min      

ss-710

0.71

22

25

Steel shot-230

            all pass 10% max   85% min 97% min    

ss-600

0.60

25

30

Steel shot-170

              all pass 10% max     85% min 97% min

ss-425

0.50

30

35

Steel shot-110

                  all pass 10% max    

---

0.42

36

40

Steel shot-70

                      all pass 10% max

---

0.35

44

45

SAE Sieve No

8

10

12

14

16

18

20

25

30

35

45

40

IS-4606 Shot No

Screen Size in mm

BS Sieve No

ASTM Sieve No

BS Aperture No

2.8

2.4

2.0

1.69

1.4

1.2

1.0

.85

.71

.6

.5

.42

.355


All material is screened to meet or exceed IS, SAE & SFS SPECIFICATIONS.

Chemical & Physical properties, composition of steel shot:

Chemical Composition (%) Cast Steel Shot
Carbon 0.85 - 1.20
Manganese 0.60 - 1.20
Silicon 0.40 - 1.20
Sulfur 0.05 max.
Phosphorous 0.05 max.
Typical Physical Properties

Steel Shot

Hardness 40-50 HRC
(390-510 H.V_
42-50 HRC
(540-640 H.V)
56-60 HRC
(640-740 H.V)
Hardness Deviation Maximum deviation ±3.0HRC
Microstructure Finely tempered Martensite
Minimum Density 7.4 g/CC
Appearance & Odor Spherical – No Odor
Durability 2000 – 3000 cycles

Cast steel shots & grits are non-hazardous as received. Fine metallic dust is generated as the abrasives break down from impact & wear during normal use. Since the ferrous content is > 95% dust or fumes will consists mainly of iron or iron oxide. In addition, the fine steel dust created can be a mild explosion hazard.


Steel Shots Grades, Sizes, Finishes and Applications

Shot Grade Finish Applications
S-70 Fine, smooth shot finish. Excellent coverage.
Blasting of relatively small ferrous and non-ferrous castings. Removal of light scale from foreign and heat treated parts. Blasting of machined parts. Removal of mill scale, rust and other deposits.
S-110
S-170
S-230 Medium, light shot finish. Good coverage.
Blasting of grey iron, malleable iron, light steel castings, medium forgings, heat-treated parts and heavy mill scale - rust and other deposits.
S-280
S-330
S-390 Average to heavy shot finish. Average coverage.
Blasting of steel, heavy malleable iron and grey iron castings. Removal of scale from large billets, slabs - rust and other deposits.
S-460
S-550
S-660 S-780 Rough coverage. Adequate for most applications.

Heavy steel castings. Removal of tough, heavy scale.


Steel shot blasting is the most widely used process in sand & shot blasting industries for cleaning, stripping and improving a metal surface. The grade or size of steel shot will determine the finish achieved on the surface of the metal.

Smaller steel shot will result in a smoother and more polished surface. Larger steel shot will clean more aggressively but produce a rougher surface. Both air powered and wheel blast machine can be used to accelerate the steel shot onto the surface of the part. Due to the hardness and density of steel shot, it can be recycled as much as 3000 times before replacement. Since steel shot does not use an abrasives process, a minimal amount of dust is created in the blasting process.

Steel abrasives (cast steel shots) are essentially used to clean metal surfaces and parts like: Desanding and cleaning foundry castings, Descaling metal sheets, billets and profiles produced by the steel industry, Surface preparation in steel works prior to coating

Our cast steel shot continue to find broad and growing applications in diverse markets such as automotive, aerospace, agriculture, construction, foundry, mining, railroad, shipyard, stone cutting, office machines, petrochemical, and other major industries.

Steel shot blasting
Blast cleaning is the ideal cleaning process prior to forming, shearing, rolling, painting or galvanizing.
Shot Blasting uses fine steel media to clean, descale and remove rust from parts. Parts are "sprayed" with shot, similar to sandblasting, revealing the original bright metallic appearance. The restored surface has a uniform luster, optimized for lube adhesion.

Blast cleaned steel reduces wear on shears, punches and roll-formers by removing abrasive mill scale. This can allow immediate painting. Blast cleaning also eliminates the need for post fabrication cleaning process. Shot blasting consists of attacking the surface of a material with one of many types of shots. Normally this is done to remove something on the surface such as scale, but it is also done sometimes to impart a particular surface to the object being shot blasted, such as the rolls used to make a 2D finish. The shot can be sand, small steel balls of various diameters, granules etc. The device that throws the shot is either a large air gun or spinning paddles which hurl the shot off their blades. Shot-blasting media for all applications:

Cast steel shot
Cast steel grit
Chilled cast iron shot
Chilled cast iron grit
Cut wire shot
Aluminium oxide grit
Glass bead Copper slag Garnet

STEEL SHOT PEENING
Shot peening is a cold working process in which the surface of a spring is bombarded with small spherical media called steel shot. Each piece of shot striking the surface creates a small indentation or dimple. Overlapping dimples develop an even layer of metal in residual compressive stress. Fatigue cracks will not start or propagate in a compressively stressed zone. When a residual compressive stress is produced in the surface, the tensile stress created by the applied load must first overcome the residual compressive stress before the resultant surface stress becomes tensile.

Use of Peening
Shot peening has many uses in industry, particularly in the manufacture of parts as different as gears, springs, welded joints, aircraft parts, transmission shafts, torsion bars, etc. Experience has shown that shot peening could increase the endurance limit of lifting hooks up to 50%. For this to be done the necessary equipment must be obtained.

Peening Is Now Frequently Used As An Alternative To Polishing Where Directional Scratches Can Propagate Minute Cracks. It Is Ideal For The Treatment Of Fillets, Grooves Or Unsupported Edges Or Anywhere Where Sudden Changes In Form Occur.


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