ASTM A249/A249M Type XM-19 Introduce
ASTM A249/A249M Type XM-19 is a type of steel referred to as a welded austenitic steel boiler and super heater tubes. It is a carbon steel alloy primarily composed of chromium and nickel, and may also include other elements such as copper and molybdenum. The mechanical properties of ASTM A249/A249M Type XM-19 are remarkable, making it a popular choice for many components in various industries, such as plumbing, heating, and cooling systems.
Smelting temperature:1539°C - 1315°C
Application:Welded austenitic steel tubes for boilers, superheaters, heat exchangers and condensers
ASTM A249/A249M Type XM-19 Material Chemical Composition
The chemical composition of the ASTM A249/A249M Type XM-19 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Vanadium (V) | 0.1000 | 0.3000 |
| Silicon (Si) | - | 1.0000 |
| Sulfur (S) | - | 0.0300 |
| PhOsphorus (P) | - | 0.0450 |
| Nickel (Ni) | 11.5000 | 13.5000 |
| Nitrogen (N) | 0.2000 | 0.4000 |
| Molybdenum (Mo) | 1.5000 | 3.0000 |
| Manganese (Mn) | 4.0000 | 6.0000 |
| Chromium (Cr) | 20.5000 | 23.5000 |
| (Cb) | 0.1000 | 0.3000 |
| Carbon (C) | - | 0.0600 |
ASTM A249/A249M Type XM-19 Material Mechanical Properties
Mechanical properties include requirements for tensile strength, yield strength, hardness, elongation and fatigue limit. Chemical composition requirements range from simple limits on the levels of carbon, manganese and silicon to more complex limits on the levels of chromium, nickel and molybdenum in the steel.
The mechanical properties of the ASTM A249/A249M Type XM-19 steel are as follows:
| YieldRp0.2 | ≤ 566 (MPa) |
| TeileRm | ≤ 235 (MPa) |
| ImpactKV/Ku | 23(J) |
| ElongationA | 41% |
| Reduction in cross section on fractureZ | 42% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 214 |
ASTM A249/A249M Type XM-19 Material Thermal Properties
The thermal performance parameters of the ASTM A249/A249M Type XM-19 steel are as follows:
| Temperature (°C) | 44 | 766 | 749 |
| Modulus of elasticity (GPa) | - | 592 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 14 |
| Thermal conductivity (W/m·°C) | - | 12.3 | 22.2 |
| Specific thermal capacity (J/kg·°C) | - | 141 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.41 | - | - |
| Deity (kg/dm³) | - | - | 323 |
| Poisson’s coefficient, ν | - | - | 332 |
ASTM A249/A249M Type XM-19 Material Machining Technology
Machining is an essential process used in the fabrication of ASTM A249/A249M Type XM-19 steel. With its superior mechanical properties, ASTM A249/A249M Type XM-19 is one of the leading materials for many industrial and consumer product applications. ASTM A249/A249M Type XM-19 steel is used in a wide range of industries and has many advantages when it comes to machining due to its toughness, strength, and durability. Understanding the differences between machining ASTM A249/A249M Type XM-19 steel and machining other materials is key to successful applications.