ASTM A322 Grade 8627 Introduce
The amount of chromium in the alloy gives it a high level of corrosion resistance, making it an ideal solution for applications such as food processing and marine environments. The nitrogen, nickel and manganese also help improve corrosion resistance as they act to reduce pitting and crevice corrosion. The machining of ASTM A322 Grade 8627 is quite difficult due to its higher alloy content, meaning it requires machinability lubricants to make it easier. ASTM A322 Grade 8627 should always be used in environments where the temperature can be controlled and it should not be exposed to acidic or alkaline solutions. It is also recommended that welding processes are performed using argon shielding and a special electrode is used.
Smelting temperature:1276°C - 1376°C
Application:Alloy steel bar. Level
ASTM A322 Grade 8627 Material Chemical Composition
The chemical composition of the ASTM A322 Grade 8627 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Copper (Cu) | - | 0.3500 |
| Aluminum (Al) | - | 0.0600 |
| Molybdenum (Mo) | 0.1500 | 0.2500 |
| Nickel (Ni) | 0.4000 | 0.7000 |
| Chromium (Cr) | 0.4000 | 0.6000 |
| PhOsphorus (P) | - | 0.0350 |
| Sulfur (S) | - | 0.0400 |
| Manganese (Mn) | 0.7000 | 0.9000 |
| Silicon (Si) | 0.1500 | 0.3500 |
| Carbon (C) | 0.2500 | 0.3000 |
ASTM A322 Grade 8627 Material Mechanical Properties
ASTM A322 Grade 8627 has a relatively low coefficient of thermal expansion of 8.5 m/m-°C. This is important for components that require static tensions and tight-fitting dimensions, as it allows them to remain stable during temperature fluctuations. Additionally, ASTM A322 Grade 8627 is highly heat-treatable. This means it is easily machineable and weldable, making it an ideal choice for high-strength parts like shafts, bolts, and gear components.
The mechanical properties of the ASTM A322 Grade 8627 steel are as follows:
| YieldRp0.2 | ≤ 846 (MPa) |
| TeileRm | ≤ 988 (MPa) |
| ImpactKV/Ku | 21(J) |
| ElongationA | 24% |
| Reduction in cross section on fractureZ | 43% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 324 |
ASTM A322 Grade 8627 Material Thermal Properties
The thermal performance parameters of the ASTM A322 Grade 8627 steel are as follows:
| Temperature (°C) | 44 | 798 | 955 |
| Modulus of elasticity (GPa) | - | 167 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 34 |
| Thermal conductivity (W/m·°C) | - | 34.3 | 13.2 |
| Specific thermal capacity (J/kg·°C) | - | 132 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.34 | - | - |
| Deity (kg/dm³) | - | - | 114 |
| Poisson’s coefficient, ν | - | - | 413 |
ASTM A322 Grade 8627 Material Machining Technology
Other machining considerations for ASTM A322 Grade 8627 steel include the use of coolant and cutting fluid, as well as controlling the cutting speed, feed rate, and spindle speed. Coolant and cutting fluid can help reduce friction and heat buildup, while controlling the cutting speed, feed rate, and spindle speed can help prevent tool breakage, work hardening, and burr formation.