ASTM A29 4340 Hex Bar and AMS 6415 Aircraft Quality Stock Sizes
| GRADE | SHAPE | SIZE RANGE | CONDITIONAL OF STEEL | SPECIFICATION | MACHINABILITY |
|---|---|---|---|---|---|
| E4340 PREMIUM AQ | Rounds | 13/8“ – 7 1/2“ | Hot Rolled | AMS 6414/2300 | 57% |
| 1“ – 8 1/2“ | Normalized Tempered | 57% | |||
| 4340 | Rounds | 1/2“ – 11“ | Hot Rolled | ASTM A29/A322 | 57% |
| 10“ – 30“ | Forged Rough | ASTM A29/A322 | 57% | ||
| 1/2“ – 3 1/2“ | Cold Finished | ASTM A29/A108 | 57% | ||
| E4340 AQ | Rounds | 1/4“ – 11/2“ | Cold Finished, | AMS 6415/2301 | 57% |
| 1“ – 10 1/2“ | Hot Rolled | 57% | |||
| Hexagons | 5/8“ – 2“ | Cold Finished | 57% | ||
| Squares | 1/2“ – 2“ | Cold Finished | 57% | ||
| Flats | 1/4“ x 1“ Min – 11/2“ x 6“ Max | Cold Finished | 57% | ||
| 13/4“ x 2“ Min – 4“ x 6“ Max | Hot Rolled | 57% | |||
| E4340 300 M PREMIUM AQ | Rounds | 1“ – 7“ | Hot Rolled | AMS 6417/2300 | 57% |
AISI 4340 Round Bar with Precision Saw Cutting
| Sr.no | Cutting Methods |
|---|---|
| 1 | Laser cutting |
| 2 | CNC milling |
| 3 | CNC-controlled circular saw or band saw |
| 4 | Band saw with or without coolant |
| 5 | Circular saw: with or without coolant |
Table Of Content
- SAE 4340 Steel Bar Specification
- Types of SAE 4340 Steel Bar
- SAE 4340 Round Bar Equivalent Grades
- AISI 4340 Round Bar Chemical Properties
- SAE 4340 Steel Rod Mechanical Properties
- Physical Properties of 4340 Alloy Steel Square Bar
- Welding Methods of AISI 4340 Round Bar
- Heat Treatment of AISI 4340 Steel Flat Bar
- 4340 HT Alloy Round Bar Application
- Testing Methods of SAE 4340 Steel Rod
- 4340 Tool Steel BQ/AQ Square Bar Melting Point
- Thermal Properties of AISI 4340 Alloy Steel Flat Bar
- 4340 Steel Hot Rolled Round Bar Impact Test
- 4340 Chromoly Steel Cold Finished Steel Rod Hardness Test Result
SAE 4340 Steel Bar Specification
| Heat Treatment | Normalising / Annealing / Hardening + Tempering |
|---|---|
| General Application | Valve, Automotive, Pump, General Engineering |
| Tensile Strength(Mpa) | 862 – 1931 |
| Yield Strength(Mpa) | 934.2 min |
| Forging | 1950 – 2250 Deg. |
| Finishes | Peeled, Hot Rolled, Centreless Ground, Turned Polished |
AISI 4340 Round Bar
4340 Steel Flat Bar
4340 Square Bar
ASTM A29 4340 Rod
4340 Steel Hex Bar
E4340 Rectangular Bar
SAE 4340 Round Bar Equivalent Grades
| Country | Grade |
|---|---|
| EU (EN) | 34CrNiMo6 |
| USA | 4340 |
| Germany (DIN, WNr) | 4CrNiMo6 GS-34CrNiMo6V |
| Japan (JIS) | SNCM447 |
| France (AFNOR) | 35NCD6 |
| England (BS) | 817M40 |
| Italy (UNI) |
|
| China (GB) |
|
| Sweden (SS) | 2541 |
| Poland (PN) | 34HNM |
| Czechia (CSN) |
|
| Russia (GOST) |
|
| Inter (ISO) | 36CrNiMo6 |
AISI 4340 Round Bar Chemical Properties
| Chemical Composition | Max % | Min. % |
|---|---|---|
| Sulphur | 0.04 | 0 |
| Molybdenum | 0.35 | 0.2 |
| Nickel | 2 | 1.55 |
| Silicon | 0.35 | 0.1 |
| Carbon | 0.44 | 0.37 |
| Manganese | 0.9 | 0.55 |
| Chromium | 0.95 | 0.65 |
| Phosphorous | 0.04 | 0 |
SAE 4340 Steel Rod Mechanical Properties
| Condition | Tensile Strength MPa | Elong. % | Brinell Hardness | Ruling section mm | Yield Strength MPa | Izod Impact J |
|---|---|---|---|---|---|---|
| T | 850-1000 | 13 | 248-302 | 250 | 635 | 40 |
| T | 850-1000 | 13 | 248-302 | 150 | 665 | 54 |
| U | 930-1080 | 12 | 269-331 | 100 | 740 | 47 |
| V | 1000-1150 | 12 | 293-352 | 63 | 835 | 47 |
| W | 1080-1230 | 11 | 311-375 | 30 | 925 | 41 |
| X | 1150-1300 | 10 | 341-401 | 30 | 1005 | 34 |
| Y | 1230-1380 | 10 | 363-429 | 30 | 1080 | 24 |
| Z | 1555 | 5 | 444 | 30 | 1125 | 10 |
Physical Properties of 4340 Alloy Steel Square Bar
- Modulus of Elasticity: 29.7 x10⁶psi
- Density: 0.284 LB/in³
- Melting Point: 2600°F
Welding Methods of AISI 4340 Round Bar
| TIG Welding | Precise |
|---|---|
| Arc Welding | Economical |
| Flux-Cored Arc Welding | Out Of Post Welding |
| MIG Welding | Cleaner Welds |
Heat Treatment of AISI 4340 Steel Flat Bar
| Normalize | 850-880 (Air Cool) |
|---|---|
| Stress relieve | 30-50oC (Tempered Condition) |
| Temper | 540-680oC |
| Nitride | Liquid And Gas Nitriding |
| Harden | 830-860oC (Oil Quench) |
| Anneal | 650-700 (Controlled Furnace) |
| Forge | 850-1050oC (Furnace Cool) |
4340 HT Alloy Round Bar Application
- Automotive
- Forging
- Machine Building
- Transfer Systems
- Warm and Cold
- Oil and Gas Drilling
- Aircraft Landing Gear
Testing Methods of SAE 4340 Steel Rod
- Thermography
- Eddy Current Testing
- Dye Penetrant Testing
- Ultrasonic Testing
- Visual Inspection
- Magnetic Particle Testing
- Radiographic Testing
- Laser Shearography
4340 Tool Steel BQ/AQ Square Bar Melting Point
Thermal Properties of AISI 4340 Alloy Steel Flat Bar
| Product | Value |
|---|---|
| Thermal Conductivity | 44W/m-K (26 BTU/h-ft-°F) |
| Melting Onset | 1420°C (2580 °F) |
| Mechanical | 430°C (800 °F) |
| Latent Heat of Fusion | 250J/g |
| Melting Completion | 1460°C (2650 °F) |
| Specific Heat Capacity | 470J/kg-K (0.11 BTU/lb-°F) |
| Thermal Expansion | 13µm/m-K |
4340 Steel Hot Rolled Round Bar Impact Test
4340 Chromoly Steel Cold finished Steel Rod Hardness Test Result
AISI 4340 Square Bar with Chamfering and Annealing
- Aesthetic Finish
- Water Protection
- Structural Strength
Turn, Ground & Polished AMS 6415 Grade 4340 Round Bar
| Surface Finish | Tolerance |
|---|---|
| Black-Rolled | 0，+1mm |
| Grinding | Best h9 |
| Peeled | Best H11 |
| Cold Drawn | |
| Polished | Best h11 |
| Turned | 0，+3mm |
| Black-Forged | 0，+5mm |
Alloy Steel 4340 Round Bars with Ultrasonic Testing
