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ASTM A709 - SSABASTM A709. The ASTM A709 is the Standard Specification for Structural Steel for Bridges and encompasses carbon, high-strength low-alloy, and quenched and tempered alloy steels used as structural plates in the construction of bridges.
When the machine is engraving in high speed, the actual moving distance of the motor is usually large than the graphic. Therefore, we need to keep enough buffer distance on the two sides of the graphic. The buffer distance will be longer as long as you set faster speed, so we need to keep more buffer distance when the speed is higher.
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The Charpy tests are specified as non-fracture critical, which is a per-heat test (frequency "H"), or fracture critical, which is a per-plate test AASHTO M 270M/M 270 - Standard Specification for Grades 345W [50W], 345CR [50CR], HPS 345W [HPS 50W], HPS 485W [HPS 70W], and HPS 690W [HPS 100W] have enhanced atmospheric corrosion resistance
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ASME SA709/SA709M is Standard Specification for Structural Steel for Bridges. ASME SA709/SA709M Standard main steel grade:ASME SA709Grade 36,50,50S,50W,100,100W(SA709GR36,SA709GR50,SA709GR50S,SA709GR50W,SA709GR100,SA709GR100W)and so