The Indian iron and A709 grade 100 bridge steel plate Steel Association (ISA) lowered its steel demand forecast for 2020 to 5.1% from 5.1% in February this year. The figure is expected to hit a low of 7.7%. The company said in an official statement that the current share price has fallen sharply due to the huge downside risk. "We expect India's finished steel demand to fall to about 93.7 million tons by 2020, down from 101.5 million tons in 2019." This calendar year, the A709 grade 100 bridge steel plate decline was 7.7%, about 8 million tons. " Isa said.
With the increase of temperature, the yield limit of A709 grade 100 bridge steel plate will decrease monotonically, but the tensile strength of A709 grade 100 bridge steel plate will rise to a high peak value at a certain temperature, and then decrease. This peak temperature is called the blue brittleness temperature of A709 grade 100 bridge steel plate. Near the blue brittleness temperature, the A709 grade 100 bridge steel plate strength increases and the plasticity decreases. The elongation and section shrinkage of A709 grade 100 bridge steel plate increase with the increase of temperature, but there is a low peak at the blue brittleness temperature. The blue brittleness temperature of low carbon steel ranges from 200 ℃ to 250 ℃. The blue brittleness of low alloy steel is not obvious as that of low carbon steel, and the blue brittleness temperature is higher.
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