The scratch strength tester has been improved in the paper, which can measure the impacttoughness and has two uses.
对刮痕强度试验机进行适当的改进，就可测量芯砂的冲击韧性，并使一机两用。
2
The influences of chromium content on the hardness, impacttoughness and corrosion resistance of low carbon alloy steel were studied using om and hardness tester.