Shanghai Golston Shipping Fitting |
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Ensure the base metal fuse well with overlay welding layer, eliminate defects such as pores, enclosed slag, loose, etc.Hardening treatment changes the grain size of alloy-layer, from grad 6-7 to grade 10-12.Hardness of alloy-layer is improved from below HRC50°to above HRC60°Designed for the exhaust valves both for the heavy oil and light oil engines. |
