Products technical Indexes：

Tempering Hardness：HB260-290

Hardness of dual alloy：HRC55-60

Nitriding Hardness：HV900-1050

Depth of dual alloy：1-2.5mm

Nitriding Depth：0.5-0.8mm

Screw barrel Straightness：0.015mm

Nitriding Brittleness:≤Grade 1

Hardness of surface chromium coating after nitriding:0.05-0.10mm

Chrome hardness：HV900