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AISI SAE 5120 Alloy Steel Bar 5120 Round Bars 5120 Rods
86.0 INR/Kilograms
Product Details:
- Grade 5120
- Specific Use Engineering Industry, Automobile Industry
- Finish Black, Bright, Polished
- Application Automobile Components, Shafts, Gear, Pinions
- Length 1 Meter - 6 Meter (Customized)
- Standard AISI, ASTM, DIN, JIS, EN
- Tolerance H8, H9, H10
- Click to view more
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AISI SAE 5120 Alloy Steel Bar 5120 Round Bars 5120 Rods Price And Quantity
- 1 Kilograms
- 86.0 INR/Kilograms
AISI SAE 5120 Alloy Steel Bar 5120 Round Bars 5120 Rods Product Specifications
- Engineering Industry, Automobile Industry
- 5120
- 1 Meter - 6 Meter (Customized)
- AISI, ASTM, DIN, JIS, EN
- Automobile Components, Shafts, Gear, Pinions
- Black, Bright, Polished
- 10mm - 350mm
- AISI SAE 5120 Alloy Steel
- H8, H9, H10
- Forged, Peeled, Turned, Ground
- Round Bar, Rod
- Hot Rolled
- 7.85 g/cm3
- Drawn / Peeled / Polished / Turned
- 340 MPa min
- Round, Custom Shapes Available
- 163-229 HB
- 600 MPa min
- Mill Finished / Smooth
- Standard Export Packing, Bundled or Loose
- Annealed, Normalized, Quenched, Tempered
- 12% min
- Good
- Bars, Rods, Customized cut lengths
Product Description
AISI SAE 5120 is an American standard low-carbon, low-alloy chromium steel specifically engineered for case hardening (carburizing).
With a low base carbon content and targeted Chromium (~0.80%) additions, it offers an optimal balance of structural ductility and deep hardenability. AISI 5120 round bars, rods, and stock are highly favored in mass-production automotive and machinery manufacturing pipelines because they possess excellent cold-forming characteristics, crisp machinability in the annealed state, and develop a highly wear-resistant outer shell after heat treatment.
Technical Specifications & Chemical Composition
The primary alloying engine in 5120 is Chromium, which improves response to heat treatment, depth of hardness penetration, and resistance to surface abrasion.
Chemical Composition (Weight % per AISI/SAE)
| Element | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) | Chromium (Cr) |
| Min | 0.17% | 0.70% | 0.15% | 0.70% | ||
| Max | 0.22% | 0.90% | 0.035% | 0.040% | 0.35% | 0.90% |
Mechanical Properties (Core vs. Case Boundaries)
When heat-treated, AISI 5120 yields a dual-phase microstructure. The case gains a high-carbon, high-hardness martensitic structure to combat wear, while the low-carbon inner core remains highly structural and fracture-resistant.
Typical Core Mechanical Properties (Post-Quench & Temper)
| Property | Value |
| Tensile Strength ($R_m$) | $ge$ 780 MPa |
| Yield Strength ($R_{p0.2}$) | $ge$ 590 MPa |
| Elongation ($A_5$) | $ge$ 12% |
| Reduction of Area ($psi$) | $ge$ 50% |
| As-Delivered Hardness (Annealed Stock) | $le$ 197 HBW |
| Final Surface Case Hardness | 58 62 HRC |
Global Cross-Reference Equivalents
Because industrial components are sourced and designed worldwide, AISI 5120 aligns closely with these major international material standards:
-
Europe (EN / DIN): 20Cr4 (1.7027) or 17Cr3 (1.7016)
-
Japan (JIS): SCr420 / SCr420H
-
China (GB/T): 20Cr
-
United Kingdom (BS): 523M20
-
Russia (GOST): 20X
Heat Treatment Parameters
-
Forging / Hot Working: 1150C 850C
-
Normalizing: 870C - 920 C (Air cool to normalize internal grain stresses)
-
Pseudo-Annealing: 650- 700C (Slow furnace cool to maximize drilling or milling speed)
-
Carburizing Temperature: 900C - 950C (Introduced into gas or pack media to enrich the surface layer)
-
Core Hardening Quench: 860- 900C (Oil or modern polymer bath quench)
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Case Hardening Quench: 780-820C (Optimizes surface layer conversion to sharp martensite)
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Stress-Relieving Temper: 150C -200C (Maintains maximum surface HRC while lowering brittle stress risks)
Primary Applications of AISI 5120 Round Bars
5120 round bars and rods are optimized for small-to-medium structural components that experience constant friction, moderate impact forces, or high localized contact pressure.
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Automotive Transmissions: Small gear wheels, pinion gears, manual gearbox selector forks, and splined drive shafts.
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Fastener Components: Case-hardened wrist pins, heavy-duty shackle pins, steering knuckles, and link studs.
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General Engineering: Camshaft components, indexing shafts, wear sleeves, and small-diameter industrial rollers.
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Power Tools: Internal drive gears and armature pinions for pneumatic or electric drills and impact wrenches.
Weldability Constraints: AISI 5120 is not recommended for standard structural welding. The carbon migration occurring during carburization, combined with chromium, creates highly brittle heat-affected zones (HAZ) that are very susceptible to immediate cracking. If welding is required, it must be performed on the raw base metal before the case-hardening steps take place.
Versatile Strength for Demanding Applications
AISI SAE 5120 alloy steel bars offer a balanced combination of strength, ductility, and wear resistance, making them ideal for automotive components and engineering machinery. Their adaptability through processes like forging, peeling, and polishing ensures suitability for customized applications, allowing manufacturers flexibility in designing parts such as gears and shafts.
Precision and Customization
Available in various diameters, lengths, and tolerances, 5120 alloy steel rods can be supplied as drawn, turned, ground, or polished, meeting precise specifications. Whether you need black, bright, or polished finishes, the product arrives in standard export packing-bundled or loose-making logistics simple and secure.
FAQ's of AISI SAE 5120 Alloy Steel Bar 5120 Round Bars 5120 Rods:
Q: What are the primary applications of AISI SAE 5120 alloy steel bars and rods?
A: AISI SAE 5120 alloy steel bars and rods are chiefly used in the automobile and engineering sectors for manufacturing components like shafts, gears, and pinions, thanks to their high strength, good machinability, and reliable performance under stress.Q: How is 5120 steel typically supplied and processed for customized use?
A: 5120 steel is supplied in various forms including drawn, peeled, polished, or turned, and can be further processed by forging, grinding, or custom cutting. This allows users to obtain the exact dimensions and surface finish required for specific engineering projects.Q: What surface finishes and tolerances are available for 5120 round bars?
A: Surface finishes include mill finished, smooth, black, bright, or polished states, with tolerances such as H8, H9, and H10 available. These options enable precise matching to technical requirements and functional needs.Q: When should one choose 5120 alloy steel for industrial applications?
A: Select 5120 alloy steel when you require a material that combines good machinability, medium carbon content, and high wear resistance. It is especially beneficial for parts subjected to surface stress and dynamic loading, such as automotive gears and shafts.Q: Where are 5120 steel bars manufactured and how are they packed for shipping?
A: Manufacturers, exporters, and suppliers across India produce 5120 steel bars according to international standards (AISI, ASTM, DIN, JIS, EN). Products are packed using standard export packaging, either bundled or loose, to ensure safe delivery.Q: What benefits does 5120 alloy steel provide over conventional carbon steels?
A: Compared to regular carbon steels, 5120 alloy steel offers superior strength, better hardness after heat treatment, and greater resistance to wear, making it an advantageous choice for high-performance and durable components.Tell us about your requirement
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