HEBEI HUANSHENG BEARING CO., LTD
After the bearing is manufactured and passed inspection, it cleaned rust-proof, then put into inner package to achieve waterproof, moisture-proof, dust-proof, impact-proof, maintain quality accuracy of bearing, facilitate use sales. .The packaging ...
When the steel ball is fully quenched into martensite and then heated to 150°C-170°C for tempering, as tempering temperature increases, according change of its internal structure, it carried out in four stages:1) Decomposition martensite; 2) ...
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