Chrome Moly 30CrMo4 Alloy Steel Bars

Name: Chrome Moly 30CrMo4 Alloy Steel Bars
Brand: JAYANT IMPEX
Price: 90.0 INR
Availability: InStock

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Product Details:

Technique Hot Rolled / Forged
Material Chrome Moly 30CrMo4 Alloy Steel
Processing Peeled/Turned/Heat Treated/Annealed/Normalized
Type Round Bar
Grade 30CrMo4
Standard DIN 1.7220, EN10083-3
Diameter 20mm to 600mm
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Chrome Moly 30CrMo4 Alloy Steel Bars Price And Quantity

Minimum Order Quantity 1 Kilograms
Price 90.0 INR/Kilograms

Chrome Moly 30CrMo4 Alloy Steel Bars Product Specifications

Technique Hot Rolled / Forged
Type Round Bar
Standard DIN 1.7220, EN10083-3
Grade 30CrMo4
Processing Peeled/Turned/Heat Treated/Annealed/Normalized
Material Chrome Moly 30CrMo4 Alloy Steel
Tolerance h9, h11 or as per requirement
Specific Use Shafts, Gears, Connecting Rods, High Stress Mechanical Parts
Length 2-6 meters (custom lengths available)
Application Automotive Components, Engineering Parts, Oil & Gas Industry, Heavy Machinery
Diameter 20mm to 600mm
Finish Bright/Black/Polished

Tensile Strength min 800 MPa
MOQ As per inquiry
Elongation 14% (minimum)
Heat Treatment Quenched and Tempered (QT)
Impact Value 35-45 J at 20C
Yield Strength min 540 MPa
Delivery Condition As Rolled / Forged / Heat Treated
Hardness 200-250 HB (as supplied)
Surface Condition Mill finish, Annealed, or Heat Treated

Product Description

30CrMo4 (also known by its standard material number 1.7214) is a versatile, mid-carbon chromium-molybdenum alloy steel specified under the European standard EN 10083.

Sitting precisely between the lower-carbon 25CrMo4 (AISI 4130) and the higher-carbon 42CrMo4 (AISI 4140), 30CrMo4 is a through-hardening grade. It hits a highly sought-after "sweet spot" in mechanical engineering: it provides considerably higher tensile strength and yield performance than 4130, while maintaining better impact toughness, ductility, and weldability than 4140.

Global Equivalents

When cross-referencing this grade across international manufacturing prints and material tracking databases, it aligns closely with:

Germany (DIN / WNr): 30CrMo4 / 1.7214
USA (AISI/SAE): AISI 4130 / 4135 variants (Sits right on the border)
France (AFNOR): 30CD4
Japan (JIS): SCM430 / SCM432
Italy (UNI): 30CrMo4

Chemical Composition (Typical %)

The balanced addition of chromium and molybdenum ensures deep through-hardening capabilities during oil quenching, while the 0.30% carbon level keeps the material structurally resilient under shock loads.

Carbon (C)	Chromium (Cr)	Molybdenum (Mo)	Manganese (Mn)	Silicon (Si)	Phosphorus (P)	Sulfur (S)
0.26% 0.34%	0.90% 1.20%	0.15% 0.30%	0.60% 0.90%	0.40%	0.025%	0.035%

Mechanical Properties (Quenched & Tempered, +QT)

30CrMo4 round and flat bars are most frequently utilized in the hardened and tempered condition. Depending on the final bar diameter ( $d$ ), typical minimum values include:

Tensile Strength ( $R_m$ ): 800 1100 MPa (N/mm)
Yield Strength ( $R_{e}$ ): 550 650 MPa
Elongation ( $A_5$ ): 12% 14%
Impact Toughness (Charpy-V): 45 J
Delivery Condition Hardness (Annealed): 223 HBW (Optimized for clean milling, sawing, and turning)

Key Technical Characteristics

Optimized Toughness Profile: Because it contains less carbon than 4140, it exhibits excellent resistance to brittle fracture and crack propagation under cold-weather operational settings or sudden impact loads.
Surface Hardening Capabilities: If an application demands high wear resistance alongside high core toughness, 30CrMo4 responds exceptionally well to induction hardening or nitriding, reaching a case hardness profile of 5257 HRC.
Conditional Weldability: Unlike 42CrMo4, which requires incredibly intense thermal management to weld, 30CrMo4 can be welded with moderate preheating ( $150text{C} - 250text{C}$ ) and standard post-weld stress-relief practices, lowering fabrication risks in high-stress structural assemblies.

Common Industrial Applications

30CrMo4 alloy bars are highly specified across fields where high fatigue resistance, torque handling, and light structural weldability must coexist:

Automotive & Motorsport: Axle shafts, high-load steering knuckles, connecting rods, and transmission input shafts.
Fasteners & Clamping: High-tensile structural tie rods, heavy-duty double-bolted clamps, engine studs, and specialized anchor bolts.
Power Generation & Machinery: Wind turbine component pins, compressor shafts, hydraulic cylinder rods, and high-pressure valve bodies.
Drilling & Oil Hardgoods: Subsurface tool joints, specialized drill collars, and heavy-duty structural couplings.

Excellent Mechanical Strength

30CrMo4 alloy steel bars provide high tensile strength and yield strength, ensuring reliable performance under stress. Their hardness (200-250 HB as supplied) and impact values (35-45 J at 20C) make them well-suited for critical components in automotive and heavy machinery applications.

Versatile Processing & Finishing Options

Choose from a variety of processing methods such as peeled, turned, heat treated, annealed, or normalized, along with finishes like bright, black, or polished. These options ensure the steel bars meet the specific requirements and surface conditions of your project.

Wide Application Range

Engineered to DIN and EN standards, these bars excel in shafts, gears, connecting rods, and other high-stress parts across automotive, engineering, oil & gas, and heavy machinery sectors. Their robust properties extend component life and reduce maintenance intervals.

FAQ's of Chrome Moly 30CrMo4 Alloy Steel Bars:

Q: How are the 30CrMo4 alloy steel bars heat treated?

A: Chrome Moly 30CrMo4 alloy steel bars undergo a quenching and tempering (QT) process to enhance their mechanical properties, including strength and toughness. This process also ensures the bars maintain their structural integrity during demanding operations.

Q: What applications are best suited for 30CrMo4 alloy steel bars?

A: These bars are ideal for use in shafts, gears, connecting rods, and other high-stress mechanical components found in automotive, engineering, oil & gas industries, and heavy machinery due to their superior mechanical strength and impact resistance.

Q: When is it best to choose mill finish, annealed, or heat treated bars?

A: The choice depends on your application needs: mill finish offers a raw surface, annealed bars provide improved machinability and ductility, while heat treated (QT) bars deliver optimum strength and toughness for high-performance or stress-critical applications.

Q: Where are these steel bars manufactured and supplied from?

A: These round bars are produced and supplied by manufacturers, exporters, fabricators, and suppliers based in India, serving domestic and international markets across various engineering sectors.

Q: What are the key benefits of using 30CrMo4 alloy steel?

A: Using 30CrMo4 steel ensures high strength, excellent impact resistance, reliable performance under stress, and compatibility with rigorous machining and finishing processes. This enhances component lifespan and reduces downtime for maintenance.

Q: How can I specify custom dimensions or tolerances for my requirements?

A: You can request custom lengths (2-6 meters or as required), diameter (20mm to 600mm), and tolerances (h9, h11, or as specified) directly with the supplier during inquiry, allowing precise tailoring for your project's needs.

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