ASTM A240/A240M A240 348H Introduce
ASTM A240/A240M A240 348H is an international standard that specifies requirements for chromium and chromium-nickel stainless steel plate, sheet, and strip for pressure vessels and for general applications. It applies to the following grades: type 304, 304L, 316, 316L, 321, and 347, for rolled and forged products; and type 304H, 347H, 17-4PH, 630, and 631/N08367, for hot- and cold-rolled sheet and strip.
Smelting temperature:1536°C - 1697°C
Application:Heat-resistant chrome and chrome-nickel stainless steel sheets, sheets and strips for pressure vessels
ASTM A240/A240M A240 348H Material Chemical Composition
The chemical composition of the ASTM A240/A240M A240 348H steel are as follows:
| Element | Min | Max |
|---|---|---|
| Nickel (Ni) | 9.0000 | 13.0000 |
| Chromium (Cr) | 17.0000 | 19.0000 |
| PhOsphorus (P) | - | 0.0300 |
| Sulfur (S) | - | 0.0450 |
| Manganese (Mn) | - | 2.0000 |
| Silicon (Si) | - | 0.7500 |
| Carbon (C) | 0.0400 | 0.1000 |
| Cobalt (Co) | - | 0.2000 |
| PhOsphorus (P) | - | 0.0450 |
| Sulfur (S) | - | 0.0300 |
ASTM A240/A240M A240 348H Material Mechanical Properties
ASTM A240/A240M A240 348H steel has excellent mechanical properties that make it suitable for many different applications. It provides high tensile and yield strengths, a high degree of hardness, impact strength, and excellent corrosion resistance.
The mechanical properties of the ASTM A240/A240M A240 348H steel are as follows:
| YieldRp0.2 | ≤ 353 (MPa) |
| TeileRm | ≤ 619 (MPa) |
| ImpactKV/Ku | 43(J) |
| ElongationA | 32% |
| Reduction in cross section on fractureZ | 11% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 422 |
ASTM A240/A240M A240 348H Material Thermal Properties
The thermal performance parameters of the ASTM A240/A240M A240 348H steel are as follows:
| Temperature (°C) | 43 | 137 | 352 |
| Modulus of elasticity (GPa) | - | 811 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 32 |
| Thermal conductivity (W/m·°C) | - | 22.3 | 22.2 |
| Specific thermal capacity (J/kg·°C) | - | 142 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.11 | - | - |
| Deity (kg/dm³) | - | - | 312 |
| Poisson’s coefficient, ν | - | - | 323 |
ASTM A240/A240M A240 348H Material Machining Technology
ASTM A240/A240M A240 348H steel is more difficult to work with due to its high temperature strength, low ductility, and high yield strength. When machining, the tool must be sharp, and a wider cutting edge must be used to avoid tool failure. Additionally, stainless steel is not suitable for welding, as it requires special procedures to prevent cracking or corrosion.