ASTM A240/A240M S44660 Introduce

ASTM A240/A240M S44660 provides the requirements for a wide range of products, ranging from general purpose to stress relieved pressure vessels and related components. It also provides requirements for flat-rolled and cold-rolled sheet, strip and strip-maps, coils, and plates. The specification includes requirements for chemical composition, surface quality, final heat treatment, physical and mechanical properties, heat-resistance, shop surface finishing, and packaging.

Smelting temperature:1332°C - 1896°C

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

ASTM A240/A240M S44660 Material Chemical Composition

The chemical composition of the ASTM A240/A240M S44660 steel are as follows:

ElementMinMax
Nitrogen (N)-0.0400
Molybdenum (Mo)3.00004.0000
Nickel (Ni)1.00003.5000
Chromium (Cr)25.000028.0000
PhOsphorus (P)-0.0400
Sulfur (S)-0.0300
Manganese (Mn)-1.0000
Silicon (Si)-1.0000
Carbon (C)-0.0300
(Nb+Ti)0.20001.0000

ASTM A240/A240M S44660 Material Mechanical Properties

The chromium and nickel content of ASTM A240/A240M S44660 steel gives it increased corrosion resistance, while the molybdenum gives it improved ductility and improved heat and oxidation resistance. The nitrogen content helps to increase its strength.

The mechanical properties of the ASTM A240/A240M S44660 steel are as follows:

YieldRp0.2 ≤ 442 (MPa)
TeileRm≤ 279 (MPa)
ImpactKV/Ku11(J)
ElongationA21%
Reduction in cross section on fractureZ41%
As-Heat-Treated ConditionSolution and Aging, Annealing, Ausaging, Q+T,etc
Brinell hardness (HBW)434

ASTM A240/A240M S44660 Material Thermal Properties

The thermal performance parameters of the ASTM A240/A240M S44660 steel are as follows:

Temperature (°C)31939617
Modulus of elasticity (GPa)-629-
Mean coefficient of thermal expaion ×10-6/(°C)--44
Thermal conductivity (W/m·°C)-33.324.2
Specific thermal capacity (J/kg·°C)-414-
Specific electrical resistivity (Ω mm²/m)0.14--
Deity (kg/dm³)--233
Poisson’s coefficient, ν--414

ASTM A240/A240M S44660 Material Machining Technology

The ideal cutting tools for machining ASTM A240/A240M S44660 steel are carbide-tipped cutting tools due to their hardness and durability. These tools are designed to provide excellent chip clearance and minimal chatter when machining stainless steel.