SAE4340, same as UNS G43400. Tensile strength σb ≥980(100) Yield strength σs ≥835(85), used to manufacture important parts with high strength and good plasticity. After nitriding treatment, make important parts with special functional requirements, such as shafts, gears, and gears. Firmware etc. Delivery ASTM A709 high strength steel in heat treatment (normalizing, annealing or high temperature tempering) or without heat treatment.
Based on the advantages of ASTM A709 high strength steel steel resources in domestic market and good reputation, combining with the huge international market demand for steel products, our company started the international business in 2010 and successfully being approved and certified by ISO9001:2008, the Registration number is 626014Q11531R0S. With the quality steel ASTM A709 high strength steel products and professional service, our company was award the international acclaim from infrastructure, shipbuilding, petroleum industry etc., and gradually grow into a bright star in the steel export industry .
The blanking of the structural steel plate is first to find 90 degrees, and then use a tape measure and a powder line to draw the cutting range. According to the thickness of the carbon steel plate plus the cutting allowance, drilling is required. For the deep processing of ASTM A709 high strength steel structural steel sections or profiles: First use a square ruler or a curved ruler to find 90 degrees, and then use a square ruler or a ruler to cut the line and add the cutting margin to the hole.
With the increase of temperature, the yield limit of ASTM A709 high strength steel will decrease monotonically, but the tensile strength of ASTM A709 high strength steel will rise to a high peak value at a certain temperature, and then decrease. This peak temperature is called the blue brittleness temperature of ASTM A709 high strength steel. Near the blue brittleness temperature, the ASTM A709 high strength steel strength increases and the plasticity decreases. The elongation and section shrinkage of ASTM A709 high strength steel 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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