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  1. karma281053

    Advice for Impact value at -20 degrees Centigrate for Bolt in SAE4340

    Hi Redpicker, Thanks for your valuable advice. I shall aim at around 300 BHN with double tempering during heat treatment. Should I opt for 'Salt Bath' heat treatment process ? In smaller diameter (2.2"), I am comfortably getting around 100-120 Joules at room temp.+25 C in SAE 4340 steel in...
  2. karma281053

    Advice for Impact value at -20 degrees Centigrate for Bolt in SAE4340

    I have to manufacture NiCrMo Alloy Steel (SAE 4340/817M40)Hex head Bolt - 12 Nos. (Silo Connecting Pins) Bolt Length (excluding head): 555mm (21.85"). Bolt Dia: 100mm (4"). This Pin Bolt is to be Proof Load Tested at 90 tons. The Test load is not to be applied axially but radially. I know that...

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