AISI 8630 alloy steel bars and rods find extensive usage in heavy-duty shafts, gears, crankshafts, and structural components demanding high strength and fatigue and wear resistance. They are utilized in the production of automotive crank and camshafts, in gear blanks, and in drive train components. In power generation and aeronautics, 8630 finds applications in tie rods, supports, and high-stress fittings. It also finds applications in heavy machinery parts, forging blanks, and high-strength fasteners and studs. Due to its capacity to hold surface treatments and maintain toughness, it is well qualified for rigorous mechanical and industrial assemblies.
AISI 4340 is an Ni‑Cr‑Mo alloy steel having typical composition of ~0.38‑0.43% C, 1.65% Ni, 0.80% Cr, 0.25% Mo, with Mn, Si, S, P as additional elements. In quenched and tempered condition, tensile strength is up to 950–1,250 MPa, yield strength ~850–1,100 MPa, and elongation ~10–15%. Hardness between 300–380 HB (or more per temper) can be achieved. It provides outstanding toughness, impact strength, and resistance to fatigue. The alloy machine well in softer temper, and accepts additional treatments (induction hardening, nitriding) well.
| Sizes | 2-100mm A/F |
|---|---|
| Tolerance | H9, H8, H10, K12, H13K9, K10, H11, H12, K11 |
| Round bar Sizes | Diameter: 3-~800mm |
| Technique | Hot Rolled, Cold Drawn, Cold Rolled, Forged, Rod |
| Processing | Bar cutting to 650mm |
| Surface | Bright, Hot Rolled Pickled, Sand Blasting Finished, Hairline, Cold Drawn, Polished suppliers |
| Condition | Hardened and tempered, annealed |
| Form | Precision Square, Ingot, T-Bar, Rod, Round, Welding Rod, I/H Bar, Flat Bar, Blocks, Rings, Rectangle, Hex (A/F), Hollow, Threaded, Profiles, Ground Bar, Channel Bar, Billet, Triangle, Round Rod, Half Round Bar, Forging etc. |
| Square bar Sizes | 4 to 100mm |
| Finish | Hot rolled annealed, Bright, smooth turned, Polish, Rough Turned, Cold (bright) drawn, centreless ground, Grinding, peeled, hot rolled, slit rolled edge, Centreless Ground & Black. |
| Flat bar Sizes | Width: 10 – 500 millimeter Thick.: 2 to 100 millimeter |
| Element | Composition |
|---|---|
| C% | 0.38/0.43 |
| Mn% | 0.60/0.80 |
| P% | 0.035 max |
| S% | 0.040 max |
| Si% | 0.20/0.35 |
| Ni% | 1.65/2.00 |
| Cr% | 0.70/0.90 |
| Mo% | 0.20/0.30 |
| Property | Value |
|---|---|
| Tensile Strength | 850-1000 N/mm 2 |
| Elongation | 13% |
| Hardness | 250-350 HB |
Alloy Steel AISI 4340 is commonly used in aerospace, automotive, and heavy machinery applications due to its excellent strength, toughness, and fatigue resistance. It's ideal for manufacturing shafts, gears, and structural components.
AISI 4340 offers high tensile strength, excellent toughness, and good wear resistance. It is known for its ability to withstand high-stress and high-impact conditions.
Yes, AISI 4340 can be heat-treated to enhance its hardness and strength, making it highly adaptable for different engineering requirements.
Alloy Steel AISI 4340 bars and rods find applications in aircraft landing gear, structural elements, crankshafts, gears, and high-stress shafts. In transportation, in automotive, they are found in drive shafts, differential gears, and connecting rods. In oil & gas, they are used as high-strength components for pumps, valves, and downhole tools. They are applied to heavy machinery, mining machines, and forging blanks. Due to their strength, 4340 is also utilized in structural beams and components that sustain shock loading. Because of its high resistance to fatigue, it is applicable in aerospace engine mounts and mission-critical devices.
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