AISI/SAE 4340 Round Bars
AISI/SAE 4340 Round Bars
High-quality AISI/SAE 4340 Round Bars supplied in bright, black and forged conditions for machining, forging and engineering applications.
- AISI 4340
- Round Bars
- Bright Bars
- Hex Bars
- Square Bars
- Flat Bars
- Forged Bars
AISI/SAE 4340 Round Bars Manufacturer in India
Sawariya Metal Industries is a manufacturer, supplier, stockist and exporter of AISI/SAE 4340 Round Bars in different sizes, grades, specifications and finishes for industrial and engineering applications.
AISI/SAE 4340 Round Bars are long products supplied in round, square, hexagonal and flat sections in bright, black, peeled and forged conditions for machining and component manufacturing.
AISI 4340 is a nickel-chromium-molybdenum steel with high strength and toughness in heat-treated condition. Alloy steel contains controlled additions of chromium, molybdenum, nickel or vanadium to improve strength, hardenability, toughness and performance at elevated temperatures.
Typical applications for AISI/SAE 4340 Round Bars include power plants, boilers, refineries, petrochemical, oil & gas, heat exchangers, automotive, engineering components and general engineering.
Key Features of AISI 4340
High-Temperature Strength
Chrome-moly grades retain strength at elevated temperatures.
Creep Resistance
Suitable for long-term high-temperature pressure service.
Hardenability
Responds well to heat treatment for strength and toughness.
Durability
Reliable performance in demanding mechanical service.
AISI/SAE 4340 Round Bars Specifications
| Parameter | Specification |
|---|---|
| Product | AISI/SAE 4340 Round Bars |
| Form | Round, Square, Hex, Flat, Rectangle, Forged |
| Diameter | 3 mm to 500 mm |
| Length | 1 to 6 Metres, Custom Cut Lengths |
| Condition | Bright, Black, Peeled, Ground, Forged |
| Finish | Bright Polished, Black, Rough Turned, Centreless Ground |
Chemical Composition of AISI 4340
| Grade | S | P | Cr | Si | Ni | C | Mn | Mo |
|---|---|---|---|---|---|---|---|---|
| SAE – 4340 | .035 MAX | .040 MAX | .70 – .90 | .15 – .35 | 1.65 -2.00 | .38- .43 | .60 – .80 | .20 – .30 |
Mechanical Properties of AISI 4340
| Tensile strength kgf/mm² | Yield strength kgf/mm² | Elongation % | Cross section reduction rate % | Impact value | Hardness Hb |
|---|---|---|---|---|---|
| ≧100 | ≧90 | ≧16 | ≧45 | ≧7 | 293~352 |
Equivalent Grades of AISI 4340
| Standard | AISI / SAE 4340 |
|---|---|
| UNS | – |
| WERKSTOFF NR | 34CrNiMo6, 40NiCrMo8-4 |
| BS 970 | 817M40, En24 |
| UNI | 35NiCrMo6 (KB), 40NiCrMo7 (KB) |
| JIS | SNCM 447, SNB24-1-5 |
| EN name | 34CrNiMo6 |
| EN # | 1.6582, 1.6562 |
Types of AISI/SAE 4340 Round Bars
Round Bars
Bright, black, peeled and ground round bars.
Hex & Square Bars
Hexagonal and square sections for machined parts.
Flat Bars
Flat sections for fabrication and engineering.
Forged & Hollow Bars
Forged bars, rings and hollow bars on request.
Applications & Industries
- Power Plants
- Boilers
- Refineries
- Petrochemical
- Oil & Gas
- Heat Exchangers
- Automotive
- Engineering Components
- Pressure Vessels
- Heavy Machinery
- Fabrication
- General Engineering
Quality & Inspection
Quality-Focused Manufacturing & Supply
AISI/SAE 4340 Round Bars can be supplied with inspection, testing and documentation according to the applicable specification and customer purchase requirements.
- Diameter & straightness inspection
- Visual and surface inspection
- Material grade verification
- Chemical composition verification
- Mechanical property testing
- Hardness testing as applicable
- Ultrasonic testing as applicable
- Mill Test Certificate (MTC)
Why Choose Our AISI/SAE 4340 Round Bars?
Wide Size Range
Small to large diameters available.
Multiple Finishes
Bright, black, peeled and ground bars.
Cut Lengths
Bars cut to required lengths.
Machining Quality
Consistent quality for machining and forging.
AISI/SAE 4340 Round Bars Manufacturer, Supplier & Exporter
Sawariya Metal Industries supplies AISI/SAE 4340 Round Bars for domestic and international projects in a wide range of sizes, grades and specifications. Products can be supplied in standard and custom dimensions according to drawings and purchase order requirements.
Every order can be supported with Mill Test Certificates, inspection reports, third-party inspection on request and secure export-worthy packaging.
Share your size, grade, quantity and specification requirements with our team to receive a competitive quotation for AISI/SAE 4340 Round Bars.
Related AISI/SAE Round Bars Products
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AISI/SAE 8620 Round Bars
AISI 8620 is a nickel-chromium-molybdenum case-hardening steel for gears and shafts.
AISI/SAE 8630 Round Bars
AISI 8630 is a nickel-chromium-molybdenum steel with good hardenability and toughness.
Technical Note: Technical values should be verified against the applicable ASTM / ASME / EN specification, purchase order requirements and Mill Test Certificate (MTC) for the supplied product.