用慢应变速率拉伸实验及U形弯试样浸泡实验研究了16Mn钢和16Mn（HIC）钢的基体及焊缝材料在酸性H2S溶液中的应力腐蚀开裂（SCC）行为。结果表明：在实验条件下上述材料均具有明显的SCC敏感性，其裂纹是氢致开裂引起的穿晶型应力腐蚀开裂；16Mn（HIC）钢抗SCC的性能优于16Mn钢，但16Mn（HIC）不具有明显的耐SCC的性能；两种材料焊缝的SCC敏感性明显大于母材，热处理能够改善焊缝抗应力腐蚀开裂的性能。
Stress corrosion cracking (SCC) behaviors of 16Mn and 16Mn(HIC) steels and their melted samples in acid H2S solution are investigated, with slow-strain-rate test(SSRT) and U-bent-specimen test.The results shows that both 16Mn(HIC) steel and 16Mn steel as well as their welded joint materials are all easy to subject to SCC damage in NACE solution, and the cracks of all specimens are HIC-induced transgranular cracks. The resistance to SCC of 16Mn(HIC) steel is better than that of 16Mn steel, as well as the behavior of weld joint of 16Mn(HIC) steel also performs better than that of 16Mn steel;the susceptivities of welded specimens of these two kinds of steel are much higher than those of their base materials, and heat treatment can improve the abilities of welded joint materials to resist SCC.
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