34CrNi3Mo Alloy Steel Bar
34CrNi3Mo alloy steel bar is a nickel-chromium-molybdenum steel with outstanding strength, toughness, and fatigue resistance. Equivalent to AISI 4340 / JIS SNCM439 round bars, it is widely used in heavy-duty engineering components such as gears, shafts, axles, and aerospace parts. Supplied mainly in quenched and tempered condition, 34CrNi3Mo steel bars offer excellent hardenability and wear resistance for demanding applications.
| 34CrNi3Mo steel round bar Specification: |
| Grade | 34CrNi3Mo |
|---|---|
| Specification | GB/T 3077 |
| Round bar size | Diameter: 3mm~800mm |
| Angle bar size | 3mm*20mm*20mm~12mm*100mm*100mm |
| Square bar size | 4mm*4mm~100mm*100mm |
| Flat bar size | Thickness: 2mm~100mm |
| Width: 10mm~500mm | |
| Bar size | 2mm~100mm |
| Finish | Bright, Polish, Rough Turned, Grinding, Centreless Ground & Black |
| Surface | Hot Rolled Pickled or Sand Blasting Finished, Cold Drawn, Bright, Polished, Hairline |
| Condition | Cold Drawnd Pulished Cold Drawn Centreless Ground & Polished, Annealed round bar |
| Technique | Hot Rolled, Cold Rolled, Cold Drawn, Forged Round Bar, Rod |
| Form | Round, Rod, Precision Ground Bar, Square, Round Rod, Hollow, Hex (A/F), Triangle, Rectangle, Threaded, T-Bar, Half Round Bar, Flat Bar, Rings, Blocks, Billet, Ingot, I/H Bar, Angle, Channel Bar, Profiles, Forging Etc. |
| 34CrNi3Mo alloy steel rod Chemical Composition: |
| Grade | C | Mn | Si | S | P | Cr | Mo |
| 34CrNi3Mo | 0.30-0.40 | 0.5-0.8 | 0.17-0.37 | 0.035 | 0.035 | 0.7-1.1 | 0.25-0.40 |
| 34CrNi3Mo bar steel bar Round Rod Mechanical Properties: |
| Yield Strength Rp0.2(MPa) |
Tensile Strength Rm(MPa) |
Elongation δ5 (%): | Reduction of area ψ (%): |
Impact energy Akv (J): |
Impact toughness value αkv (J/cm2) |
Hardness |
| ≥ 785(85) | ≥ 900(85) | ≥ 12 | ≥ 40 | ≥ 58 | ≥ 55(5) | ≥ 248 HB |
| Applications of 34CrNi3Mo alloy steel bars |
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Automotive: heavy-duty gears, transmission shafts, axles, crankshafts
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Aerospace: landing gear components, structural parts
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Oil & Gas: drill collars, high-strength fasteners, downhole tools
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Engineering Machinery: spindles, couplings, forged parts
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Power & Energy: turbine shafts, generator components
| FAQ |
Q1: Is 34CrNi3Mo the same as AISI 4340 bar?
They are close equivalents; 34CrNi3Mo is the Chinese standard, while AISI 4340 is the American standard.
Q2: What delivery condition is available?
Usually quenched & tempered, but hot rolled, normalized, and forged bars are also available.
Q3: What industries commonly use 34CrNi3Mo steel bars?
Automotive, aerospace, oil & gas, heavy machinery, and energy industries.
| SASA ALLOY’S Quality Assurance |
1. Visual Dimension Test
2. Mechanical examining like tensile, Elongation and reduction of area.
3. Impact analysis
4. Chemical examination analysis
5. Hardness test
6. Pitting protection test
7. Penetrant Test
8. Intergranular Corrosion Testing
9. Roughness Testing
10. Metallography Experimental Test
| Why Choose Us |
1. You can get the perfect material according to your requirement at the least possible price.
2. We also offer Reworks, FOB, CFR, CIF, and door to door delivery prices. We suggest you to do deal for shipping which will be quite economical.
3. The materials we provide are completely verifiable, right from raw material test certificate to the final dimensional statement.(Reports will show on requirement)
4. We guarantee to give a response within 24hours(usually in the same hour)
5. Provide SGS TUV report.
6. We are fully dedicated to our customers. If it will not possible to meet your requirements after examining all options, we will not mislead you by making false promises which will create good customer relations.
7.Provide one-stop service.
| Alloy bar Package: |
1. Packing is quite important especially in a case of international shipments in which consignment pass through various channels to reach the ultimate destination, so we put special concern regarding packaging.
2. Sasa alloy’s pack our goods in numerous ways based on the products. We pack our products in multiple ways, such as,
