ISO 6509

Maximum depth of erosion: 200μm

Forged products that use XA Metal (specified heat treatment is performed after forging) comply with the evaluation standard of 200μm maximum depth of erosion.

Gap jet corrosion test method

XA Metal is a material that has much more superior erosion-corrosion resistance compared to JIS C3771 material. It corrodes uniformly overall with the same kind of layer corrosion as JIS CAC406C material.

Apply a threading tensile stress to a joint for evaluation that has been machined to add a tapered female pipe thread, by applying a certain torque to a bushing that has been machined to add a male thread. Observe how many hours it takes before cracks occur on the surface in an atmosphere of 14% ammonia. By testing under the same conditions, it is possible to make relative evaluations between the material being evaluated and the comparison material. The photograph below shows an example in which a stainless steel bushing is mounted on the brass material being evaluated.

XA Metal forged products have more superior stress corrosion cracking resistance compared to JIS C3771 material forged products.

XA metal shows good forgeability over wide ranges of upset ratios and forging temperatures equivalent to those for JIS C3771. The recommended forging temperature shown here is a rough yardstick. The product shapes and forging conditions vary for each forging operation. We recommend that you run test forging with actual work pieces to check the optimum forging temperature first.

In order to ensure stable dezincification corrosion resistance and to eliminate residual stress, after forging, it is necessary to heat treat XA Metal at 450 to 480ºC (actual metal temperature) for 2 hours or longer.
However, if the forged product does not require the dezincification corrosion resistance, this heat treatment is not necessary.

The machinability rating for KEEPALLOY ZC Metal-2 show higher values for cutting resistance than C3604 and CAC406C, but the cutting chips are fine and machining is possible without changing the cutting conditions greatly.