High-Durability S70-S780 Cast Steel Shot for Shot Blasting and Surface Treatment

• Customization: Available
• Natural Abrasive Type: Artificial Abrasive Type
• Artificial Abrasive Type: Artificial Abrasive Type
• Model NO.: Steel Shot
• Application: Metal Parts
• Function: Surface Finish
• Source: Artificial Abrasives
• Particle Size: Abrasive
• Hardness: HRC 40-68 (Grade-Dependent)
• Shape: Spherical/Round
• Micro-Structure: Martensite
• Hollow Particles: <5%
• Certificate: SGS
• Standard: SAE J444
• Sample: Yes, We Can Supply Sample
• Business Type: Manufacturer
• S: <0.05%
• Si: 0.40-1.20%
• Mn: 0.60-1.20%
• P: <0.05%
• Payment Term: T/T, L/C
• Density: 7.4 g/cm3
• After-Sale Service: Sincere to Solve Your Problems
• Application 1: Shot Blasting and Surface Treatment
• Transport Package: 1). 25kg/Bag, Then 40 Bags in One Ton Bag.
• Specification: S70-S780
• Trademark: JUNDA
• Origin: China
• HS Code: 720510
• Production Capacity: 3000 Tons/Month
• Package Size: 95.00cm * 95.00cm * 80.00cm
• Package Gross Weight: 1004.000kg

Product Description

Product Description

High-Durability Cast Steel Shot S70–S780  2,500+ Ervin Cycles | Shot Blasting & Peening Abrasive | SAE J444

Junda Cast Steel Shot is manufactured from controlled steel raw materials through a carefully managed forming, heat-treatment, screening and quality-control process. Every batch is produced to meet SAE J444 standards, with OES spectrometry and cross-section hardness verification before shipment.

Available in S70–S780 grades (Ø0.2–2.5 mm) with hardness options from approximately HRC 40–68, the product is engineered around a proprietary Tempered Martensite + Bainite composite microstructure — resolving the industry's fundamental trade-off between hardness and durability. The martensite phase delivers high surface hardness for blasting efficiency; the bainite phase provides the toughness to absorb impact and arrest crack propagation.

Ervin cycle life 2,500–2,800 cycles ( industry average ~1,800 cycles (+40%))
Hollow particle rate < 5% (national standard: < 10%)
Cracked particle rate < 10% (national standard: < 15%)
Density ≥ 7.4 g/cm³ for consistent kinetic energy and surface coverage

Rather than simply supplying different shot sizes, we provide a controlled steel shot system — matching media grade, size and hardness to specific workpiece materials and surface-treatment requirements.

Grade	Diameter	Hardness	Recommended Application
S70–S170	Ø0.2–0.5 mm	HRC 63–68	Precision castings, aluminium / zinc alloy deburring, mould cleaning
S230–S390	Ø0.6–1.2 mm	HRC 58–65	Steel structure rust removal, iron casting cleaning, plate pre-treatment (Sa 2.5)
S460–S780	Ø1.4–2.5 mm	HRC 40–62	Heavy castings, gear shot peening, bridge steel anti-corrosion pre-treatment

Parameter	National Standard	Junda Actual
Hollow particle rate	< 10%	<5%(+50% margin)
Cracked particle rate	< 15%	<10%(+67% margin)
Density	≥ 7.20 g/cm³	7.4 g/cm³
Ervin cycle life	~1,800 cycles (typical)	2,500–2,800 cycles (+40%,vs. national standard typical value)
Microstructure	Tempered Martensite	Tempered Martensite + Bainite Composite

Designed Around Industrial Surface-Treatment Challenges

Industrial blasting and shot peening require more than simply high hardness.

Inconsistent particle size, excessive cracks, hollow particles, premature breakdown and improper hardness selection can affect blasting efficiency, surface uniformity and media consumption.

Our steel shot is developed around four key requirements:

Consistent Particle Geometry: Controlled spherical shape provides predictable impact behavior and stable coverage.

Controlled Hardness: Different hardness grades allow users to select suitable impact characteristics for different workpieces and processes.

Structural Reliability: Controlled manufacturing and heat treatment help reduce premature particle breakdown during repeated impact.

Application Matching: Different shot sizes and hardness grades can be selected according to workpiece material, surface condition and treatment objective.

Solid Waste Reduction With 2,500–2,800 Ervin cycles — ~40% above industry average — each ton of steel shot replaces an estimated 5–8 tons of single-use abrasives such as copper slag or coal slag, reducing solid waste generation by over 80% per project and cutting disposal costs significantly.

No Heavy Metal Contamination Clean chemical composition (S & P both <0.05%) with no residual copper or other heavy metals found in slag-based abrasives. Spent media meets environmental disposal standards and can be safely landfilled or recycled, protecting soil and groundwater at job sites.

Lower Lifecycle Carbon Footprint High recyclability means less abrasive manufactured, transported, and disposed of per m² treated. Compared to single-use alternatives, the total energy consumption and carbon emissions per unit of surface prepared are substantially reduced — supporting low-carbon surface treatment across shipbuilding, infrastructure, and manufacturing.

Improved Worker Safety Low hollow particle rate (<5%) and low crack rate (<10%) minimize dust generation during blasting, improving air quality for operators and reducing occupational health risks — compliant with international industrial hygiene standards.

From Casting Defects to a Cleaner, More Consistent Surface

01.After casting, workpieces may contain:
Residual molding sand
Core sand
Oxide scale
Flash and burrs
Surface contamination
Heat-treatment scale

02.These contaminants can affect:
Visual appearance
Dimensional inspection
Surface coating
Machining
Welding
Further surface treatment

Our cast steel shot provides controlled mechanical impact to efficiently clean casting surfaces while maintaining consistent blasting performance.

Matching the Media to the Casting
Casting Requirement	Recommended Direction
Light surface contamination	Smaller / medium shot
General sand removal	Medium shot
Heavy sand and scale	Medium / coarse shot
Large steel castings	Coarser shot
Small or complex castings	Fine shot
Surface preparation before coating	Application-specific size and hardness
Application	Recommended Grade & Description
Blast Cleaning of Castings	S170–S230: Removes sand and oxide scale from iron/steel castings without damaging sharp edges; achieves Sa 2.5 surface cleanliness at optimized blasting parameters.
Steel Structure Rust Removal	S330–S460: First-pass rust removal rate >95%, reaching ISO 8501 Sa 2.5 level — meeting the substrate requirements for heavy-duty anti-corrosion coating.
Gear Shot Peening	S110–S170: Induces compressive residual stress layer on gear tooth flanks, extending fatigue life by 20–40% vs. untreated parts.
Shipbuilding & Pipeline Pretreatment	S280–S390: Compliant with PSPC (IMO MEPC.215(63)) surface preparation requirements for ballast tank coating.

Project		National Standards	Quality
Chemical composition(%)	C	0.85-1.20	0.85-1.0
	Si	0.40-1.20	0.70-1.0
	Mn	0.60-1.20	0.75-1.0
	S	<0.05	<0.030
	P	<0.05	<0.030
Hardness	steel shot	HRC40-50 HRC55-62	HRC44-48 HRC58-62
Density	steel shot	≥7.20 g/cm3	7.4g/cm3
Microstructure		Tempered Martensite or Troostite	Tempered Martensite + Bainite Composite
Appearance		Spherical; Hollow particles <10%; Cracked particles <15%;	Spherical; Hollow particles <5%; Cracked particles <10%;
Type		S70 ,S110, S170, S230, S280, S330, S390, S460, S550, S660, S780
Packing		Each ton in a separate pallet and each ton divided into 25KG packs.
Durability		2,500–2,800 cycles (+40%)
Diameter		0.2mm,0.3mm,0.5mm,0.6mm,0.8mm,1.0mm,1.2mm,1.4mm,1.7mm,2.0mm,2.5mm
Application		1. Blast cleaning: Used for blast cleaning of casting, die-casting, forging; sand removal of  casting, steel plate, H type steel, steel structure.  2. Rust removal: Rust removal of casting, forging, steel plate, H type steel, steel structure.  3. Shot peening: Shot peening of gear, heat treated parts.  4. Shot blasting: Shot blasting of profile steel, shipboard, steel board, steel material,steel structure.

Quality Control for Casting Applications

Every Batch Is Built Around Key Performance Indicators
Chemical Composition: Controls material consistency.

Hardness: Ensures the shot provides the required impact characteristics.

Particle Size: Controls impact distribution and blasting coverage.

Sphericity: Helps maintain predictable impact behavior.

Hollow Particle Control: Reduces particles that may break prematurely during repeated impact.

Crack Particle Control: Reduces premature fragmentation.

Microstructure: Supports consistent mechanical performance and durability.

Q1. How long has Junda been producing steel shot?

Jinan Junda Industrial Technology Co., Ltd. was established in 2005. With over 20 years of manufacturing experience, steel shot and steel grit are among our core product lines alongside garnet sand, glass beads, and copper slag.

Q2. Which industries and countries do you serve?
We export to 90+ countries. Key industries include shipbuilding, oil & gas pipeline coating, bridge and steel structure construction, automotive manufacturing, foundry and casting, and aerospace surface preparation — across North America, Europe, Middle East, Southeast Asia, and Australia.

Q3. What is your production capacity?
Monthly production capacity exceeds 3,000 metric tons across all abrasive product lines. We maintain buffer stock of key steel shot grades to support urgent and large-volume orders without compromising lead time.

Q4. What is the MOQ and packaging?
MOQ is 1 metric ton. Standard packaging: 25 kg woven PP bags, 40 bags per 1-ton bulk bag. Custom packaging and private-label bags are available from 1 ton. Free 500 g samples are provided before bulk orders.

Q5. What is your lead time and shipping port?
10–15 working days from order confirmation. We ship from Qingdao Port with full export documentation. Incoterms: FOB, CIF, EXW, DDP, FAS. Payment: T/T, L/C, Western Union, D/P.

Q6. Do you offer OEM / custom orders?
Yes. Custom hardness ranges, non-standard size distributions, private-label packaging, and blended shot/grit mixes are available from 1 metric ton. Our technical team can match your existing supplier's specifications or assist with grade selection for new applications.

Q7. What standards does your steel shot comply with?
Our products comply with SAE J444, SAE J827, ISO 11124-3, and GB/T 18838. The factory is ISO 9001:2015 certified and independently audited by BV (Audit ID: MIC-ASR255938). Products are exported to markets with strict QC requirements including the USA, Germany, Japan, and South Korea.

Q8. How do you control hardness and roundness consistency?
Each batch undergoes Rockwell HRC hardness testing, sieve analysis for size distribution, and roundness inspection per SAE J444 before release. Third-party SGS or BV inspection is also available upon customer request.