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AISI SAE 4340 Slip on Flange Product name alloy steel flange Grade AISI SAE: 4140, 4130,4145, 4340, 8620, 8630, 5140, 10B21, 50B40,81B45,12L14 DIN: 20MoCr4, 34Cr4, 16MnCr5, 17CrNiMo6, 20MnCr5 , ...