ASTM A29/A29M A29 4121 Introduce
ASTM A29/A29M A29 4121 is a steel specification that covers both alloy and carbon steel grade bars. It is one of the oldest and most preeminent standards for steel bar quality and is widely accepted worldwide in many different industries. The ASTM A29/A29M standard embodies the best of alloy steel qualities, and its detailed, testing and documentation requirements ensure that quality is maintained across the spectrum of usage.
Smelting temperature:1396°C - 1912°C
Application:Hot forged and cold worked carbon steel and alloy steel rods
ASTM A29/A29M A29 4121 Material Chemical Composition
The chemical composition of the ASTM A29/A29M A29 4121 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Molybdenum (Mo) | 0.2000 | 0.3000 |
| Chromium (Cr) | 0.4500 | 0.6500 |
| PhOsphorus (P) | - | 0.0350 |
| Sulfur (S) | - | 0.0400 |
| Manganese (Mn) | 0.7500 | 1.0000 |
| Silicon (Si) | 0.1500 | 0.3500 |
| Carbon (C) | 0.1800 | 0.2300 |
ASTM A29/A29M A29 4121 Material Mechanical Properties
Hardness is one of the most important mechanical properties of ASTM A29/A29M A29 4121 steel. The hardness of this alloy can range from 40 to 60 HRC, depending on the grade of steel and the heat treatment. This hardness provides good wear resistance, making it suitable for applications that require abrasive resistance
The mechanical properties of the ASTM A29/A29M A29 4121 steel are as follows:
| YieldRp0.2 | ≤ 751 (MPa) |
| TeileRm | ≤ 612 (MPa) |
| ImpactKV/Ku | 41(J) |
| ElongationA | 41% |
| Reduction in cross section on fractureZ | 21% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 433 |
ASTM A29/A29M A29 4121 Material Thermal Properties
The thermal performance parameters of the ASTM A29/A29M A29 4121 steel are as follows:
| Temperature (°C) | 42 | 924 | 849 |
| Modulus of elasticity (GPa) | - | 974 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 23 |
| Thermal conductivity (W/m·°C) | - | 34.3 | 33.2 |
| Specific thermal capacity (J/kg·°C) | - | 133 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.34 | - | - |
| Deity (kg/dm³) | - | - | 431 |
| Poisson’s coefficient, ν | - | - | 141 |
ASTM A29/A29M A29 4121 Material Machining Technology
ASTM A29/A29M A29 4121 steel is extremely versatile, which is why it is frequently used in machining processes. The machining of ASTM A29/A29M A29 4121 steel requires the use of high speed steel, cobalt steel, and high performance cutting tools which is why it is important to understand the machining behaviors of this material in order to obtain the best part quality and productivity.