After thermomechanical (controlled) rolling on the 3600 mill at MK Azovstal Joint Stock Company, 03G1B low-carbon, niobium-microalloyed steel corresponds to strength categories Kh65-Kh70 for tube steel. Thanks to the low sulfur content (0.001 percent) and the ferritic structure of the steel (3.6 percent pearlite), the impact ductility at test temperatures between + 20 and - 80 deg C is no less than 350 J/cm~2. The low-temperature stability of the steel is also relatively good: the fiber content in DWTT samples is no less than 85 percent at -40 deg C. On account of its high purity and the weak segregation of chemical elements, 03G1B steel containing 0.001 percent S and 0.03 percent C is highly resistant to cracking in media that contain H_2S: HIC = 0; the threshold stress in 720-hr holding is 0.8 sigma_y.
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机译：在MK Azovstal股份公司的3600轧机上进行热机械（受控）轧制后，低碳，铌微合金化的低碳03G1B钢对应于管钢的强度等级Kh65-Kh70。由于低硫含量（0.001％）和钢的铁素体结构（3.6％珠光体），在+ 20至-80℃的测试温度下，冲击延展性不低于350 J / cm〜2。该钢的低温稳定性也相对较好：DWTT样品中的纤维含量在-40℃时不低于85％。由于其高纯度和化学元素的弱偏析，03G1B钢的含量为0.001％ S和0.03％C在包含H_2S的介质中具有很高的抗裂性：HIC = 0; HIC = 0; HIC = 0。保持720小时的阈值应力为0.8 sigma_y。
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