1. Steel: 38CrMoAl (41CrAlMo7), after heat treatment, the steel has good performance in abrasive resistance, corrosive resistance and torque resistance.
2. Screw and barrel can be welded with alloy layer to increase the abrasive resistance.
3. Cr12MoV (SKD11) liner can be pushed into barrel’s inner hole, let barrel has excellent abrasive resistance.
BRIEF INTRODUCTION:
1. Steel: 38CrMoAl (41CrAlMo7), after heat treatment, the steel has good performance in abrasive resistance, corrosive resistance and torque resistance.
2. Screw and barrel can be welded with alloy layer to increase the abrasive resistance.
3. Cr12MoV (SKD11) liner can be pushed into barrel’s inner hole, let barrel has excellent abrasive resistance.

Furthermore, better steel or production technical can be used for higher quality requirement:
