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我厂一种产品需将M10×60毫米的2Cr13钢螺钉焊接在4毫米厚的A_3钢板上,采用T422焊条。装配中在上紧螺帽时,发现螺钉很脆,一碰即从近焊缝处断开。取样进行化学分析,螺钉含碳0.19%,含铬12～14%。符合2Cr13钢的要求,未发现其它异常的化学成份。对断裂区进行金相检查,各部分组织见图1,图中“1”为铁素体+碳化物,为2Cr13的退火组织。“2”为马氏体十少t铁素体.该区域在焊接时受热转变为奥氏体.又在随后的冷却过程中淬火成马氏体,由于2Cr13钢含碳盆较低,
I plant a product to be M10 × 60 mm 2Cr13 steel welded 4 mm thick A_3 steel plate, using T422 electrode. When tightening the nut in the assembly, it was found that the screw was very brittle and the touch was severed from the near weld. Sampling for chemical analysis, screw carbon 0.19%, 12 ~ 14% chromium. In line with 2Cr13 steel requirements, found no other abnormal chemical composition. Metallographic examination of the fracture zone, each part of the organization shown in Figure 1, the figure “1 ” for the ferrite + carbide, 2Cr13 annealing organization. “2 ” for the martensite ten less t ferrite.This area is heated in the weld is transformed into austenite.And in the subsequent cooling quenched into martensite, as 2Cr13 steel containing carbon basin is low,