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一、前言为了适应低、中碳合金高强度钢焊接的需要,发展了屈服强度大于80kgf/mm~3的结构钢用840焊条。该焊条既具有高的强度又具有好的塑韧性包括好的低温
I. Preface In order to meet the needs of low and medium carbon alloy high strength steel welding, the 840 electrode for structure steel with yield strength greater than 80kgf / mm ~ 3 has been developed. The electrode has both high strength and good plasticity and toughness, including good low temperature