ASTM A709/A709M Grade 690 Type A Introduce

ASTM A709/A709M Grade 690 Type A is a type of high strength, low-alloy structural steel designed to provide superior corrosion resistance and enhanced strength at elevated temperatures. The standard specifies the grades, types, shapes and sizes of {stnadard} steel that meet the requirements for performance in various applications. A709/A709M steel is available as a full range of plates, sheets, strips, bars, shapes, and rounds and is used in a wide variety of applications in the construction industry.

Smelting temperature:1684°C - 1663°C

Application:Structural steel for bridge

ASTM A709/A709M Grade 690 Type A Material Chemical Composition

The chemical composition of the ASTM A709/A709M Grade 690 Type A steel are as follows:

ElementMinMax
Boron (B)-0.0025
Molybdenum (Mo)0.18000.2800
Chromium (Cr)0.50000.8000
PhOsphorus (P)-0.0350
Sulfur (S)-0.0350
Manganese (Mn)0.80001.1000
Silicon (Si)0.40000.8000
Carbon (C)0.15000.2100
Zirconium (Zr)0.05000.1500

ASTM A709/A709M Grade 690 Type A Material Mechanical Properties

ASTM A709/A709M Grade 690 Type A steel is a highly engineered, low-alloy structural steel commonly used in modern engineering applications due to its exceptional combination of mechanical properties that make it an ideal choice for creating structures that need to be strong, durable, and yet lightweight. The steel is part of a family of steels known as ASTM A709/A709M Grade 690 Type A, and is produced in a variety of grades with different chemical compositions, mechanical properties, and physical characteristics.

The mechanical properties of the ASTM A709/A709M Grade 690 Type A steel are as follows:

YieldRp0.2 ≤ 851 (MPa)
TeileRm≤ 172 (MPa)
ImpactKV/Ku32(J)
ElongationA22%
Reduction in cross section on fractureZ34%
As-Heat-Treated ConditionSolution and Aging, Annealing, Ausaging, Q+T,etc
Brinell hardness (HBW)143

ASTM A709/A709M Grade 690 Type A Material Thermal Properties

The thermal performance parameters of the ASTM A709/A709M Grade 690 Type A steel are as follows:

Temperature (°C)14981382
Modulus of elasticity (GPa)-535-
Mean coefficient of thermal expaion ×10-6/(°C)--24
Thermal conductivity (W/m·°C)-41.313.2
Specific thermal capacity (J/kg·°C)-143-
Specific electrical resistivity (Ω mm²/m)0.21--
Deity (kg/dm³)--142
Poisson’s coefficient, ν--311