ASTM A240/A240M 304H Introduce

ASTM A240/A240M 304H is a valuable reference for anyone who has to procure stainless steel products for general and stress relieved pressure vessels. It also provides comprehensive product guidance and manufacturing instructions, making it an invaluable tool for engineers, quality control personnel, and stainless steel product manufacturers.

Smelting temperature:1242°C - 1981°C

Application:Heat-resistant chrome and chrome-nickel stainless steel sheets, sheets and strips for pressure vessels

ASTM A240/A240M 304H Material Chemical Composition

The chemical composition of the ASTM A240/A240M 304H steel are as follows:

ElementMinMax
Nickel (Ni)8.000010.5000
Chromium (Cr)18.000020.0000
PhOsphorus (P)-0.0450
Sulfur (S)-0.0300
Manganese (Mn)-2.0000
Silicon (Si)-0.7500
Carbon (C)0.04000.1000

ASTM A240/A240M 304H Material Mechanical Properties

ASTM A240/A240M 304H is a popular steel grade used. It is widely used in chromium and chromium-nickel stainless steel plate, sheet, and strip for pressure vessels and for general applications. ASTM A240/A240M 304H steel has excellent mechanical properties, including excellent tensile and yield strength. It also has very good corrosion resistance and is used widely in many application fields.

The mechanical properties of the ASTM A240/A240M 304H steel are as follows:

YieldRp0.2 ≤ 743 (MPa)
TeileRm≤ 647 (MPa)
ImpactKV/Ku41(J)
ElongationA23%
Reduction in cross section on fractureZ12%
As-Heat-Treated ConditionSolution and Aging, Annealing, Ausaging, Q+T,etc
Brinell hardness (HBW)332

ASTM A240/A240M 304H Material Thermal Properties

The thermal performance parameters of the ASTM A240/A240M 304H steel are as follows:

Temperature (°C)41689122
Modulus of elasticity (GPa)-325-
Mean coefficient of thermal expaion ×10-6/(°C)--14
Thermal conductivity (W/m·°C)-41.322.2
Specific thermal capacity (J/kg·°C)-314-
Specific electrical resistivity (Ω mm²/m)0.14--
Deity (kg/dm³)--414
Poisson’s coefficient, ν--213

ASTM A240/A240M 304H Material Machining Technology

When machining ASTM A240/A240M 304H steel, the most important factor is machining speed and cutting forces. Machining speeds should be kept as low as possible, and a slow and steady cutting rate is recommended. This will reduce vibrations, wear on cutting tools, and will minimize the material's tendency to work harden during the machining process. An adequate amount of coolant should also be used to facilitate a smooth cut.