ASTM A790/A790M A790 S31250 Introduce

ASTM A790/A790M is a specification for seamless and welded ferritic-austenitic (duplex) stainless steel pipe. The A790 specification covers several grades of austenitic-ferritic (duplex) stainless steel pipe. This type of stainless steel has a higher corrosion resistance than other forms of stainless steel due to its higher chromium content. The bi-metallic property of duplex stainless steel is highly resistive to general corrosion and stress corrosion.

Smelting temperature:1466°C - 1945°C

Application:Seamless and welded ferritic/austenitic stainless steel tube

ASTM A790/A790M A790 S31250 Material Chemical Composition

The chemical composition of the ASTM A790/A790M A790 S31250 steel are as follows:

ElementMinMax
Tungsten (W)0.10000.5000
Silicon (Si)-0.7500
Sulfur (S)-0.0300
PhOsphorus (P)-0.0300
Nickel (Ni)5.50007.5000
Nitrogen (N)0.10000.3000
Molybdenum (Mo)2.50003.5000
Manganese (Mn)-1.0000
Copper (Cu)0.20000.8000
Chromium (Cr)24.000026.0000
Carbon (C)-0.0300

ASTM A790/A790M A790 S31250 Material Mechanical Properties

The mechanical properties of ASTM A790/A790M A790 S31250 are determined by its chemical composition, which gives it an excellent combination of ductility and strength. The alloy has a yield strength of 260 MPA, which is relatively high for a stainless steel. It also has an ultimate tensile strength of 680 MPA, which is higher than many other common stainless steels. This alloy is also highly resistant to abrasion and is suitable for use in applications that require toughness and wear resistance.

The mechanical properties of the ASTM A790/A790M A790 S31250 steel are as follows:

YieldRp0.2 ≤ 954 (MPa)
TeileRm≤ 521 (MPa)
ImpactKV/Ku43(J)
ElongationA14%
Reduction in cross section on fractureZ34%
As-Heat-Treated ConditionSolution and Aging, Annealing, Ausaging, Q+T,etc
Brinell hardness (HBW)342

ASTM A790/A790M A790 S31250 Material Thermal Properties

The thermal performance parameters of the ASTM A790/A790M A790 S31250 steel are as follows:

Temperature (°C)24639245
Modulus of elasticity (GPa)-893-
Mean coefficient of thermal expaion ×10-6/(°C)--43
Thermal conductivity (W/m·°C)-34.333.2
Specific thermal capacity (J/kg·°C)-343-
Specific electrical resistivity (Ω mm²/m)0.13--
Deity (kg/dm³)--224
Poisson’s coefficient, ν--234

ASTM A790/A790M A790 S31250 Material Machining Technology

When machining ASTM A790/A790M A790 S31250 steel, various machining processes can be used depending on the desired outcome. The most common machining processes used are turning, milling, and drilling, with an emphasis on the former two. Turning is a processes by which the steel is rotated and the cutting tool is fed into the material, allowing for a controlled cutting action with a higher amount of precision. Milling processes involve the same concept, but here the steel is moved into the cutting tool instead. Drilling is also used to create holes in the material with high accuracy, but is often used less than the other two processes.