Cast Low Carbon Steel Research Articles

Influence of heat treatment on the cyclic crack resistance of low-carbon cast steels

1. After normalizing, 20GFL steel possesses higher fatigue-crack propagation resistance the 10−9–10−7 m/cycle range of rates than normalized 20GL stee. 2. After hardening and tempering, 20GL and 20GFL steels have better cyclic crack resistance than after normalizing. 3. The relationship of the fatigue-crack propagation resistance to mechanical properties is nonlinear and has an extreme. The maximum crack propagation resistance is observed in 20GL steel after hardening and tempering at 500°C.

Electron fractographic analysis of cast low-carbon steel

Electron fractographic analysis of cast low-carbon steel

極低炭素溶接金属におよぼす合金元素の影響(第2報)

It was previously investigated that the 0.01% C cast steel containing 0.35% Si and 1.50% Mn gave excellent toughness and the same strength as rolled mild steel.In this report, the effects of aluminium, nickel, chromium, molybdenum and boron additions on the mechanical properties of this extremely low carbon Mn-Si cast steel were additionally investigated.The results were summerized as follows;1) The addition of a suitable amount of nickel, chromium, molybdenum and boron can lower the energy transition temperature of the extremely low carbon cast steel.2) Nickel, chromium and molybdenum can linearly increase the tensile strength of the extremely low carbon cast steel depending on their contents and chromium was more effective to increase strength.3) The lowest transition temperature and the highest strength of the extremely low carbon cast steel were given by an addition of 0.44% nickel and their values were respectively -45°C and 50 kg/mm2.

極低炭素溶接金属におよぼす合金元素の影響(第1報)

It is well known that carbon in steel increases its strength but decreases its ductility and toughness. Recent welding technology required to get higher strength and toughness of larger weld metal. It is not always easy to realize these objectsThe purpose of this research is to know systematically the effects of elements of simultabeouly on the strength and toughness of weld metal. Especially the strength and toughness of extremely low carbon weld metal arenvestigated in order to find a proper electrode steel wire, which gives higher toughness and enough strength. Small tasted specimens were used for experiment instead of submerged arc weld metal. The results obtained as follows:1. Extremely low carbon cast steel containing 0.01% C, 0.35% Si and 1.5% Mn gave excellent toughness and the same strength as mild steel.2. 0.04% C cast steel gave the lowest transition temperature, compared as the lower and higher carbon cast steels.3. The toughness of cast steel decreased steeply over 0.08% C or 2% Mn content.

Effect of hot-rolling texture on the plastic strain ratio of low-carbon steels

The effect of hot-rolling texture on the plastic strain ratio of a continuously cast low-carbon steel and a vacuum-melted low-carbon iron has been investigated as a function of the temperature of hot rolling. Normal cold rolling and a simulated box anneal, in dry hydrogen to decarburize, were employed subsequently. The microstructure and texture at every stage of the process was examined, and the plastic strain ratio (R value) of the final strip was determined. Results indicate that •R varies strongly with the hot-rolling temperature. OptimumR values were obtained when the hot-rolling temperature was 925° to 950°C.

Effect of ferrocerium and calcium-silicon on the properties of low-carbon cast steel

Effect of ferrocerium and calcium-silicon on the properties of low-carbon cast steel

含銅低炭素鋳鋼の析出硬化性におよぼす焼準時の質量効果について

含銅低炭素鋳鋼の析出硬化性におよぼす焼準時の質量効果について