Sell building material A709 grade 50 carbon steel material 1000tons stock in Sweden

For the estimation in April and the second quarter, the estimation on March 16 is still valid, but the decrease in April is 10% higher than the neutral prediction. It is a conservative estimation based on 10% for the high probability event. In the second quarter, the output of overseas pig iron will be reduced by 11.67 million tons, affecting the demand for A709 grade 50 carbon steel material iron ore of about 1.84 million tons; in the first half of the year, the output will be reduced by 18.899 million tons, affecting the demand for iron ore of 32.13 million tons.

The melting points of vanadium and chromium are relatively high, and the ability to interact with oxygen is also relatively large, so the metal melt should be deoxidized well, and the temperature of the wear plate melt should not be too low, exceeding 1550℃. Boron is an element that is relatively easy to be oxidized and nitridated, so the steel melt must be fully deoxidized and nitrogen fixed before adding. In general wear-resistant plates, A709 grade 50 carbon steel material, boron is added as a trace element, and the amount used is not very large.

A709 grade 50 carbon steel material, Q345 and Q345B are steel numbers. The differences are as follows:1. Q345 is general and does not indicate the quality level; Q345B is clear and the quality level is B.2. Q345 does not require to inspect the impact performance; Q345B requires that the impact performance at room temperature is qualified (impact at 20 ℃).3. Q345 does not indicate carbon content of steel; Q345B carbon content is 0.20%.Q345 refers to carbon structural steel with yield point (σ s) of 345MPa. The following letters indicate the quality level, including A, B, C, D and E.

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