Gnee Steel (Tianjin) Co., Ltd. is one of the most professional 4340 chrome moly round bars manufacturers and suppliers in China, also supports customized service. If you're going to buy 4340 chrome moly round bars made in China, welcome to get free sample from our factory. Quality products and low price are available.
4340 Chrome Moly Round Bars
AISI 4340 alloy round bar is an alloy structural steel, the implementation of the standard ASTM A29/A29M-04. high strength, toughness and outstanding NMenability and resistance to overheating stability, but the white point of high sensitivity, tempering brittleness. Weldability is poor, high temperature preheating is required before welding, stress relief is required after welding, after tempering.
4340 Alloy Steel Round Bar Chemical Composition
| % | Fe | Ni | Cr | Mn | C | Mo | Si | S | P |
|---|---|---|---|---|---|---|---|---|---|
| Min | 95.195 | 1.65 | 0.70 | 0.60 | 0.37 | 0.20 | 0.15 | - | - |
| Max | 96.33 | 2 | 0.90 | 0.80 | 0.43 | 0.30 | 0.30 | 0.04 | 0.035 |
4340 Alloy Round Stock Steel Mechanical Property
| Mechanical & Physical Properties | 21.1°C | 100°C | 204.4°C | 315.6°C | 400°C | 537.8°C | 648.9°C | 700°C | 760°C | 815°C | 870°C | 982°C |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ultimate Tensile Strength /MPa | 792 | - | - | - | - | 726 | 473 | - | 286 | - | 139 | 66 |
| 0.2% Yield Strength /MPa | 407 | - | - | - | - | 363 | 275 | - | 152 | - | 68 | 31 |
| Reduction of area % | - | - | - | - | - | - | - | - | - | - | - | - |
| Elongation % | 31 | - | - | - | - | 27 | 32 | - | 75 | - | 90 | 91 |
| 1,000 hr Rupture Strength | - | - | - | - | - | - | 83 | 47 | 26 | 15 | 8.3 | - |
| Coefficient of Thermal Expansion /µm/m°C ** | - | 11 | 12.7 | 13.4 | 13.9 | 14.3 | 15 | 15.4 | - | 16.5 | 17.1 | 18.2 |
| Thermal Conductivity /kcal/(hr.m.°C) ** | 10.06 | - | - | - | - | - | - | - | - | - | - | - |
| Modulus of Elasticity / GPa | 221 | 216 | 210 | 203 | 197 | 190 | 181 | 173 | - | 165 | 153 | 140 |
4340 Round Bar Stock Product Application
4340 round bar can be used to do the requirements of good toughness, high strength, as well as large size of the important tempering parts, such as heavy machinery, high load shafts, the diameter of more than 250mm turbine shafts, helicopter rotor shafts, turbojet engines, turbine shafts, blades, high load transmission, crankshaft fasteners, gears, etc.; can also be used for operating temperatures of more than 400 ℃ of the rotor shafts and blades, etc.; but also can be nitrided, used to manufacture important parts of the special performance requirements in the low-temperature tempering or isothermal quenching for the use of ultra-high-strength steel.
4340 Round Metal Bar Product Image
GNEE Group Team Photo
GNEE Group Customer Visit
We have professional online service personnel. If you have any questions about 4340 Chrome Moly Round Bars, please send us an inquiry and we will reply to you within one working day.