ASTM A29/A29M Grade 2L55 Introduce
ASTM A29/A29M Grade 2L55 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:1118°C - 1396°C
Application:Hot forged and cold worked carbon steel and alloy steel rods
ASTM A29/A29M Grade 2L55 Material Chemical Composition
The chemical composition of the ASTM A29/A29M Grade 2L55 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Silicon (Si) | 0.7000 | 1.1000 |
| Sulfur (S) | - | 0.0400 |
| Lead (Pb) | 0.1500 | 0.3500 |
| PhOsphorus (P) | - | 0.0350 |
| Nickel (Ni) | - | 0.2500 |
| Molybdenum (Mo) | - | 0.0600 |
| Manganese (Mn) | 0.7500 | 1.0000 |
| Copper (Cu) | - | 0.3500 |
| Chromium (Cr) | 0.4500 | 0.6500 |
| Carbon (C) | 0.5600 | 0.6400 |
ASTM A29/A29M Grade 2L55 Material Mechanical Properties
Heat treatment is an important step that determines the mechanical properties of ASTM A29/A29M Grade 2L55 steel. Heat treatment involves heating the steel to a specific temperature and then rapidly cooling it, usually with air or oil. The temperature and rate of cooling must be closely monitored and controlled to ensure the desired mechanical properties are obtained. For example, if the steel is cooled too quickly, it will be brittle and prone to cracking or breaking. On the other hand, if it is cooled too slowly, the steel will be weak and easily deformed.
The mechanical properties of the ASTM A29/A29M Grade 2L55 steel are as follows:
| YieldRp0.2 | ≤ 152 (MPa) |
| TeileRm | ≤ 477 (MPa) |
| ImpactKV/Ku | 34(J) |
| ElongationA | 44% |
| Reduction in cross section on fractureZ | 31% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 224 |
ASTM A29/A29M Grade 2L55 Material Thermal Properties
The thermal performance parameters of the ASTM A29/A29M Grade 2L55 steel are as follows:
| Temperature (°C) | 34 | 317 | 227 |
| Modulus of elasticity (GPa) | - | 376 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 11 |
| Thermal conductivity (W/m·°C) | - | 22.3 | 34.2 |
| Specific thermal capacity (J/kg·°C) | - | 323 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.41 | - | - |
| Deity (kg/dm³) | - | - | 112 |
| Poisson’s coefficient, ν | - | - | 413 |
ASTM A29/A29M Grade 2L55 Material Machining Technology
ASTM A29/A29M Grade 2L55 steel is an extremely versatile and durable alloy that can be used in a range of industrial settings. Its chemical properties make it ideal for heavy-duty applications that require high strength, formability, and corrosion resistance. It is also easily weldable, making it a great choice for components and parts in direct contact with other parts. These qualities are what make ASTM A29/A29M Grade 2L55 the alloy of choice for a variety of industrial applications.