4140 Alloy Steel Round Bar Manufacturer in India
4140 Alloy Steel Round Bar is a medium-carbon chromium-molybdenum alloy steel product used for components requiring high strength, toughness and good hardenability. AISI 4140 and SAE 4140 are widely recognized designations for this alloy steel grade.
The combination of chromium and molybdenum gives 4140 alloy steel useful hardening characteristics and makes it suitable for components subjected to high mechanical loads, impact and repeated stresses. Heat treatment can further modify the hardness, tensile strength and toughness of the material for specific engineering applications.
Super Metal Manufacturing Co. supplies 4140 Round Bars in black, bright, forged and turned conditions, along with suitable heat-treated conditions such as annealed, normalized and quenched and tempered, subject to specification and availability.
What is 4140 Alloy Steel Round Bar?
4140 Alloy Steel Round Bar is a circular-section chromium-molybdenum alloy steel bar containing carbon, manganese, silicon, chromium and molybdenum. It is commonly selected when an engineering component needs a balance of strength, toughness, hardenability and machinability.
The round form is particularly suitable for machining operations including turning, drilling, milling and threading. Because of these characteristics, 4140 Round Bars are widely used for shafts, gears, axles, pins, spindles, bolts, studs, rollers and other mechanical components.
4140 is frequently compared with EN19 and 42CrMo4 / 1.7225. These grades are commonly used for similar engineering applications, but exact material equivalence should always be confirmed against the applicable standard, chemical composition and mechanical requirements.
Material Specification Chart
| Grade | AISI 4140 / SAE 4140 |
|---|---|
| Material Type | Chromium Molybdenum Alloy Steel |
| Comparable Grades | EN19 / 42CrMo4 / 1.7225 / SCM440 |
| Specifications | ASTM A29, AISI, SAE, EN, DIN, JIS |
| Range of Diameter | 5mm to 500mm |
| Finish | Bright, Black, Forged, Turned Bright |
| Length | 1000 mm Long To 6000 mm Long |
| Form | Round Bar, Billet, Forging |
| Supply Condition | Annealed, Normalized, Hardened & Tempered, Quenched & Tempered |
AISI 4140 / SAE 4140 / EN19 / 42CrMo4 Round Bars Grade
| Country names | USA | German | British | Japan | China | Australia | |
|---|---|---|---|---|---|---|---|
| Country standards | UNS | AISI / ASTM | DIN | BS | JIS | GB/T | AS |
| Grades | G41400 | 4140 | 1.7225 / 42CrMo4 | EN19 / 817M40 | SCM440 | 42CrMo | 4140 |
4140 Alloy Steel Round Bar Chemical Composition
The chemical composition of 4140 Alloy Steel is designed to provide a useful combination of strength, toughness and hardenability. Carbon contributes to hardness and strength, while chromium and molybdenum improve hardenability and mechanical performance.
| Element | Typical Composition |
|---|---|
| Carbon (C) | 0.38 – 0.43% |
| Manganese (Mn) | 0.75 – 1.00% |
| Silicon (Si) | 0.15 – 0.35% |
| Chromium (Cr) | 0.80 – 1.10% |
| Molybdenum (Mo) | 0.15 – 0.25% |
| Phosphorus (P) | As per applicable specification |
| Sulfur (S) | As per applicable specification |
Exact chemical composition should be confirmed from the applicable material specification and Mill Test Certificate for the supplied heat.
4140 Alloy Steel Round Bar Manufacturing Process
Manufacturing 4140 Alloy Steel Round Bars involves controlled processing to achieve the required chemical composition, dimensions, surface condition and mechanical properties.
Raw Material Selection
Suitable alloy steel raw material is selected according to the required 4140 specification, dimensions and final application. Heat identification and material traceability are maintained according to applicable quality requirements.
Heating and Hot Working
The steel is heated under controlled conditions before hot rolling or forging. Controlled processing helps achieve consistent product dimensions and metallurgical characteristics.
Rolling or Forging
Depending on the required product size and manufacturing route, the heated material is rolled or forged into round bar sections. Forging may be selected for applications requiring forged stock.
Heat Treatment
4140 can be supplied in different heat-treated conditions. Annealing, normalizing, hardening, quenching and tempering may be performed according to the required mechanical properties and application.
Surface Finishing
Depending on the requirement, bars can undergo turning, peeling, grinding or other finishing operations to improve dimensional accuracy and surface condition.
Cutting and Straightening
Bars can be supplied in standard lengths or cut-to-length dimensions. Straightening and cutting can be performed according to customer requirements.
Inspection and Testing
Final inspection can include dimensional verification, visual surface inspection, chemical analysis and mechanical testing according to the applicable specification and purchase order.
Advantages of 4140 Alloy Steel Round Bar
- High Strength: 4140 can provide high mechanical strength when suitably heat treated.
- Good Toughness: It provides a useful balance between strength and toughness for demanding engineering applications.
- Excellent Hardenability: Chromium and molybdenum contribute to the hardenability of the alloy.
- Wear Resistance: Properly heat-treated 4140 can provide good resistance to mechanical wear.
- Heat Treatment Capability: The grade can be processed to obtain different combinations of hardness, strength and toughness.
- Machining Capability: Suitable material conditions can be machined into precision engineering components.
- Versatile Engineering Grade: 4140 is used across automotive, machinery, construction, mining, agriculture and general engineering sectors.
4140 Alloy Steel Round Bar Applications
4140 Round Bars are used in numerous applications where strength, toughness and hardenability are important.
Automotive Industry
Applications include shafts, axles, gears, crankshafts, spindles, pins and other high-strength mechanical components.
Heavy Machinery
4140 is used for drive shafts, rollers, gears, pins, axles and other highly loaded machinery components.
Construction Equipment
The material is used for selected pins, shafts, axles and other mechanical components in heavy construction equipment.
Oil & Gas Industry
4140 alloy steel can be used for selected high-strength mechanical components where suitable strength and toughness are required.
Mining Industry
Applications include shafts, pins, gears and other components subjected to heavy mechanical loads and repeated stresses.
Agricultural Machinery
4140 Round Bars are used for shafts, gears, axles, pins and other mechanical parts used in agricultural equipment.
General Engineering
The material is widely used for studs, bolts, spindles, rollers, shafts and machined engineering components.
4140 Alloy Steel Round Bar Heat Treatment
Heat treatment is one of the important features of 4140 Alloy Steel. The appropriate treatment depends on the required hardness, strength, toughness and final application.
Annealing
Annealing can produce a softer material condition and improve machinability for subsequent manufacturing operations.
Normalizing
Normalizing can be used to obtain a suitable microstructure and mechanical condition before further processing.
Quenching
Quenching forms part of the hardening process and is used to increase hardness and strength.
Tempering
Tempering after hardening helps obtain a suitable balance between hardness, strength and toughness.
4140 Alloy Steel Round Bar Surface Finish
4140 Round Bars can be supplied in different surface conditions according to application and customer requirements.
- Black Finish: Common hot-worked surface.
- Bright Finish: Improved surface and dimensional control.
- Turned Bright: Machined surface with improved dimensional accuracy.
- Ground Finish: Fine surface finish for applications requiring closer dimensional control.
- Forged Finish: Suitable for forged stock requirements.
Our 4140 bars can be supplied with strict dimensional accuracy, surface finish control and suitable heat-treatment conditions. Customized sizes, cut-to-length services and machining-ready supply can be arranged according to customer requirements.
Super Metal Manufacturing Co. supports industrial buyers requiring 4140 Alloy Steel Round Bar for domestic and international applications. Material documentation and inspection requirements can be discussed before order confirmation.
Alloy Steel 4140 Round Bars Dimensions Standard
|
Diameter or Width (mm) |
Weight per meter | Sectional Area | Perimeter |
|
Round (kg) |
Round (cm²) |
Round (cm) |
|
| 5.0 | 0.15 | 0.20 | 1.57 |
| 5.5 | 0.19 | 0.24 | 1.78 |
| 6.0 | 0.22 | 0.28 | 1.88 |
| 7.0 | 0.30 | 0.38 | 2.20 |
| 8.0 | 0.39 | 0.50 | 2.51 |
| 9.0 | 0.50 | 0.64 | 2.83 |
| 10 | 0.63 | 0.79 | 3.14 |
| 11 | 0.75 | 0.95 | 3.46 |
| 12 | 0.89 | 1.13 | 3.77 |
| 14 | 1.21 | 1.54 | 4.40 |
| 16 | 1.58 | 2.01 | 5.03 |
| 18 | 2.00 | 2.54 | 5.65 |
| 20 | 2.47 | 3.14 | 6.28 |
| 22 | 2.98 | 3.80 | 6.91 |
| 25 | 3.85 | 4.91 | 7.85 |
| 28 | 4.83 | 6.16 | 8.80 |
| 32 | 6.31 | 8.04 | 10.05 |
| 36 | 7.99 | 10.18 | 11.31 |
| 40 | 9.86 | 12.57 | 12.57 |
| 45 | 12.49 | 15.90 | 14.14 |
| 50 | 15.41 | 19.64 | 15.71 |
| 56 | 19.34 | 24.63 | 17.59 |
| 63 | 24.47 | 31.17 | 19.79 |
| 71 | 31.08 | 39.59 | 22.31 |
| 80 | 39.46 | 50.27 | 25.13 |
Why Choose Super Metal Manufacturing Co.?
- Since 1965: Long-standing experience in supplying industrial metal products.
- Quality & Traceability: Material Test Certificates and batch traceability can be provided according to requirements.
- Custom Services: Cut-to-length, customized sizes and machining-ready supply.
- Heat Treatment: Different material conditions can be supplied according to specification and availability.
- Export Support: Support for international packing and shipping documentation.
- Industrial Applications: Suitable supply support for automotive, machinery, construction, mining and general engineering industries.
Certifications & Quality Assurance
We maintain quality-focused inspection procedures and can provide relevant documentation according to customer and purchase requirements.
- Mill Test Certificate
- Chemical Composition Report
- Mechanical Test Report
- Dimensional Inspection
- Third-party inspection reports available on request
Export Packing & Shipping
Typical export packing includes steel bundles, wooden crates or skids, waterproof wrapping and suitable protective packaging. Fumigated wood can be arranged where required. Shipping and documentation can be coordinated according to destination and buyer requirements.
MOQ, Lead Time & Payment
Minimum Order Quantity (MOQ):
Contact us for exact MOQ based on size, grade and quantity.
Lead Time:
Stock availability, inspection, cutting, documentation and order
quantity determine delivery time.
Payment Terms:
Payment terms can be discussed according to order quantity,
destination and commercial requirements.
HS Code & Export Documentation
HS classification should be confirmed according to the exact product and destination. Export documents can include Commercial Invoice, Packing List, Bill of Lading / AWB, Mill Test Certificate and Certificate of Origin where applicable.
Typical Applications
4140 Alloy Steel Round Bars are commonly used for shafts, gears, axles, crankshafts, hydraulic piston rods, fasteners, pins, spindles, rollers and other high-strength components in automotive, agriculture, oil & gas, construction, mining and general engineering sectors.
Export Destinations
Super Metal Manufacturing Co. supports enquiries from India and international markets including Europe, the Middle East, North America, Southeast Asia and Africa, subject to commercial and shipping requirements.
Frequently Asked Questions (FAQs)
What is 4140 Alloy Steel Round Bar?
4140 Alloy Steel Round Bar is a chromium-molybdenum alloy steel product with a circular cross-section. It is widely used for high-strength mechanical components such as shafts, gears, axles, pins, studs and spindles.
What is AISI 4140 Round Bar used for?
AISI 4140 Round Bar is commonly used in automotive, machinery, construction, mining, agriculture, oil & gas and general engineering applications where strength, toughness and hardenability are required.
Is 4140 the same as 42CrMo4?
4140 and 42CrMo4 are commonly compared chromium-molybdenum alloy steels used for similar engineering applications. However, exact equivalence should be verified against the applicable standard, chemical composition and mechanical requirements.
Is 4140 equivalent to EN19?
4140 and EN19 are widely compared for engineering applications and have similar alloy-steel characteristics. The exact grade, standard and mechanical properties should be checked before using one material as a substitute for another.
Can 4140 Alloy Steel Round Bar be heat treated?
Yes. 4140 can be annealed, normalized, hardened, quenched and tempered according to the required material condition and mechanical properties.
What sizes are available in 4140 Round Bars?
4140 Round Bars can be supplied in different diameters and lengths. Common supply requirements range from small-diameter bars to large engineering sections, subject to stock and production availability.
What surface finishes are available for 4140 Round Bar?
4140 Round Bars can be supplied in black, bright, turned bright, ground and forged surface conditions depending on the required application and availability.
Do you provide a Mill Test Certificate for 4140 Round Bars?
Yes. Mill Test Certificates and relevant inspection documentation can be provided according to the applicable purchase specification and customer quality requirements.
Can 4140 Round Bars be supplied in custom sizes?
Yes. Customized diameters, cut-to-length requirements, surface finishes and heat-treated conditions can be discussed according to the required specification and availability.
How can I get a quotation for 4140 Alloy Steel Round Bar?
Share the required grade, diameter, length, quantity, surface finish, heat-treatment condition and delivery location with Super Metal Manufacturing Co. through email or WhatsApp for an availability and quotation enquiry.