48MnV-C non-heat treatment crankshaft steel is specially used for making crankshafts of Cummings C engines.It mainly adopts the technology of V—N micro-alloying,at present,it has been successfully used in making crankshaft of heavy duty truck engines.BX STEEL made trial production by means of converter→secondary metallurgy(RH + LF)→rectangular slab caster→hot rolling process,and studied the T[O],T[N],[H]and non-metal inclusion in 48MnV - C steel under continuous casting process condition,the actual grain size and the slab quality.All the chemical compositions and test results met the needs of Cummings Crankshaft Steel Standard.In order to ensure the mechanical properties of the non-heat treatment steel,a certain amount of nitrogen is added to it,also a small amount of sulfur is added to improve the cutting property of the steel.This process route can make full use of the de-hydrogen function of RH,and during RH treatment,rough adjustment of alloy elements may be made while the adjustment of Nitride Manganese nitrogen pick up and adjusting Mn,as well as Ca treatment and S content adjustment may be done during LF treatment so as to ensure the requirement of high nitrogen,low hydrogen,low oxygen content in 48MnV-C steel.Magnetic marks are defects shown in magnetic powder testing after the steel was used to make finished crankshafts.The 48MnV - C non-heat treatment crankshaft steel produced by means of the above-mentioned process route has not only relatively high robust performance which meets the needs of truck crankshaft safety,but also high qualification rate and basically no “magnetic marks” are found after being made into finished crankshafts,which meets the crankshaft standard.Therefore,this steel has been widely used in domestic crankshaft industry. 48MnV-C non-heat treatment crankshaft steel is specially used for making crankshafts of Cummings C engines. It mainly adopts the technology of V-N micro-alloying, at present, it has been successfully used in making crankshaft of heavy duty truck engines. BX STEEL made trial production by means of converter of secondary metallurgy (RH + LF) → rectangular slab caster → hot rolling process, and studied the T [O], T [N], [H] and non-metal inclusion in 48MnV - C steel under continuous casting process condition, the actual grain size and the slab quality. All the compositions and test results met the needs of Cummings Crankshaft Steel Standard. Order to ensure the mechanical properties of the non-heat treatment steel, a certain amount of nitrogen is added to it, also a small amount of sulfur is added to improve the cutting property of the steel. This process route can make full use of the de-hydrogen function of RH, and during RH treatment, rough adjustment of alloy elements may be made while the adjustment of Nitride Manganese nitrogen pick up and adjusting Mn, as well as Ca treatment and S content adjustment may be done during LF treatment so as to ensure the requirement of high nitrogen, low hydrogen, low oxygen content in 48MnV-C steel. Magnetic marks are defects shown in magnetic powder testing after the steel was used to make finished crankshafts. 48MnV - C non-heat treatment crankshaft steel produced by means of the above-mentioned process route has not only relatively high robust performance which meets the needs of truck crankshaft safety, but also high qualification rate and basically no “magnetic marks” are found after being made into finished crankshafts, which meets the crankshaft standard.Therefore, this steel has been widely used in domestic crankshaft industry.