What is the ASTM A573 steel specification raw material

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The prices of steel plates manufactured by different ASTM A573 steel specification, weather resistant steel plate manufacturers are different. Besides, the market situation of weather resistant steel plate and the global production and inventory of the whole steel market are also important factors causing the price fluctuation of steel market. What’s more, the downstream construction, real estate, road construction, etc. Factors also has certain effect on the ASTM A573 steel specification, weather resistant steel plate price. The more construction, the more demand, the easier for the steel price to rise.

Because ASTM A573 steel specification, boiler steel plate is a product of important use, the safety and reliability requirements are strict, and the manufacturing technology is difficult. The boiler steel plate material must have the following main characteristics:The boiler steel plate has high yield strength performance in a certain temperature range (medium temperature and high temperature);The boiler steel plate has sufficient toughness, no brittle failure accident will occur during manufacturing or use.

The basic phases of ASTM A573 steel specification, structural steel in the annealed state are ferrite and carbide. The alloy elements are dissolved in ferrite to form alloy ferrite, which depends on solid solution strengthening to increase strength and hardness, but at the same time reduce plasticity and toughness. The addition of alloying elements reduces the carbon content of the eutectoid point, which increases the proportion of pearlite in the structure and reduces the distance of the pearlite layer. This also increases the strength of the steel and reduces the plasticity.

What is the difference between Q345B steel and Q345A steel?
ASTM A573 steel specification, Q345B steel and Q345A steel have slight difference in chemical composition:
Q345A steel: C ≤ 0.20, Mn ≤ 1.7, Si ≤ 0.55, P ≤ 0.045, S ≤ 0.045, V 0.02 ~ 0.15;
Q345B steel: C ≤ 0.20, Mn ≤ 1.7, Si ≤ 0.55, P ≤ 0.040, S ≤ 0.040, V 0.02 ~ 0.15.
The difference between Q345B steel and Q345A steel is mainly in A and B behind the steel grade, Q345A steel grade is not subject to impact; Q345B steel grade needs 20 ℃ room temperature impact test.

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