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On March 19, 2020 the us international trade commission (ITC) vote on imports from China and India's carbon alloy astm A588 Grade B yield strength steel screw (Carbon and Alloy Steel Threaded Rod) to make a positive final anti-dumping and anti-subsidy industry damage. All five members of the international trade commission voted in favor of the ruling. The us department of commerce will issue anti-dumping and countervailing duty orders on imports of astm A588 Grade B yield strength carbon alloy steel screws from China and India, according to the itc's affirmative ruling.
The sensitivity of high temperature tempering brittleness of wear-resistant plates is generally expressed by the difference between the toughness and brittleness transition temperature of the toughened state and the embrittlement state. The more serious the brittleness of high temperature tempering, the higher the proportion of the fracture surface along the grain of the wear-resistant steel plate, astm A588 Grade B yield strength. The effect of the elements in the wear plate on the high temperature temper brittleness is divided into two aspects. One is the impurity elements that cause the high temperature temper brittleness of the wear plate.
The difference of chemical composition between astm A588 Grade B yield strength, Q420D steel and Q460D steel: Chemical composition of Q420D steel: C ≤ 0.20, Si ≤ 0.50, Mn ≤ 1.70, P ≤ 0.030, S ≤ 0.025, Nb ≤ 0.07, V ≤ 0.20, Ti ≤ 0.20, Cr ≤ 0.30, Ni ≤ 0.80, Cu ≤ 0.30, N ≤ 0.015, Mo ≤ 0.20, Al ≥ 0.015. Chemical composition of Q460D steel: C ≤ 0.20, Si ≤ 0.60, Mn ≤ 1.80, P ≤ 0.030, S ≤ 0.025, Nb ≤ 0.11, V ≤ 0.20, Ti ≤ 0.20, Cr ≤ 0.30, Ni ≤ 0.80, Cu ≤ 0.55, N ≤ 0.015, Mo ≤ 0.20, B ≤ 0.004, Al ≥ 0.015. The difference of mechanical properties between astm A588 Grade B yield strength, Q420D steel and Q460D steel: The mechanical properties of Q420D steel: yield strength ≥ 420 MPa, tensile strength 500-680 MPa. The mechanical properties of Q460D steel: yield strength ≥ 460 MPa, tensile strength 500-720 MPa.
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