30 results about "Free machining steel" patented technology

The invention discloses a high-intensity non-quenching and tempering easy-cutting steel used for a vehicle connection rod and a technical method thereof. The invention starts from the principle of improving the intensity of the non-quenching and tempering easy-cutting steel and leads the anti-tension intensity of the non-quenching and tempering easy-cutting steel containing 0.30 to 0.40 percent of carbon to be 1000MPa and the yield strength to be 750MPa by adjusting the components. The technical scheme of the invention is: the high-intensity non-quenching and tempering easy-cutting steel used for a vehicle connection rod consists of the elements of C, Si, Mn, Al, P, S, Cr, V, N and Fe; the weight percentages of the component elements are: 0.30 to 0.4 percent of C, 0. 50 to 0.70 percent of Si, 0.80 to 1.20 percent of Mn, equal to or less than 0.040 percent of P, 0.030 to 0.060 percent of S, 0.010 to 0.040 percent of Al, 0.10 to 0.40 percent of Cr, 0.10 to 0.30 percent of V, 010 to 0.015 percent of N and the rest is Fe and unavoidable impurities. The heating temperature of a continuous casting blank is 1200 DEG C; the heating time is 160min; the start rolling temperature is 1100 DEG C; the final rolling temperature is 900 DEG C; the pressing volume is 16; the cooling speed after rolling is 40 DEG C/min; after bundling, the components are thrown in a pit and slowly cooled.

Disclosed is a free machining steel for machine structural use, which can realize very good chip disposability without incorporation of any harmful material such as lead (Pb). This free machining steel is a hot rolled or hot forged free machining steel having improved chip disposability. The free machining steel comprises, by mass, carbon (C): 0.01 to 0.70%, silicon (Si): 0.05 to 2.00%, manganese (Mn): 0.20 to 3.50%, calcium (Ca): 0.0003 to 0.01%, sulfur (S): 0.020 to 0.300%, aluminum (Al): 0.002 to 0.300%, nitrogen (N): 0.003 to 0.035%, and oxygen (O): 0.0010 to 0.0080% with the balance consisting of iron (Fe) and unavoidable impurities. The steel comprises sulfides having the major axis of from 0.5 mum to 20 mum, exclusive, and comprising MnS as the main component, in a number of not less than 30% of the total number of sulfides. The steel also comprises oxide inclusions having the major axis of from 0.5 mum to 50 mum, exclusive, and being present either together with sulfides or singly, in a number of not less than 10 per mm<2>of the inspection area.

The low carbon sulfur free-machining steel comprises C: 0.05 to less than 0.20%, Si < 0.02%, Mn: 0.7 to 2.2%, P: 0.005 to 0.25%, S: more than 0.40 to 0.60%, Al < 0.003%, O: 0.0090 to 0.0280%, and N: 0.0030 to 0.0250% with the balance consisting of Fe and impurities. The steel optionally comprises one or more of Te, Sn and Se and/or one or more of Cu, Ni, Cr and Mo. The impurities comprise Ca < 0.001%, Mg < 0.001%, Ti < 0.002%, Zr <0.002%, and REM < 0.001% and satisfies Mn O > 0.018 and 2.5 < Mn/(S + O) < 3.5.This invention provides a low carbon sulfur free-machining steel that has machinability favorably comparable with Pb free-machining steels and Pb-added composite free-machining steels in relatively low-speed cutting using HSS tools, has excellent carburizing properties and continuous casting properties, and is suitable as materials for soft small components such as automobile brake components, components for peripheral devices in personal computers and components for electrical machineries and apparatuses.

The present invention relates to a PB-free free-machining steel containing, by weight %, C: 0.03 - 0.13%, Si: 0.1% or lower, Mn: 0.7 - 2.0%, P: 0.05 - 0.15%, S: 0.2 - 0.5%, B: 0.001 - 0.01%, Cr: 0.1 - 0.5%, Ti: 0.05 - 0.4%, N: 0.005 - 0.015%, O: 0.03% or lower, the remainder being Fe and other inevitable impurities. The PB-free free-machining steel may contain MnS inclusions with a particle size of 5[mu]m2 or larger, existing in the numbers of 300 to 1000 per material mm2 at the cross-section of the rolling direction of a wire rod. Further, the present invention relates to a method for manufacturing environmentally-friendly, PB-free free-machining steel by properly controlling the total amount of oxygen in the process of manufacturing a steel material.

The invention relates to a free-machining steel material. The free-machining steel material comprises the following chemical components in percentage by mass: 0.09 to 0.20 percent of C, 0.70 to 1.55 percent of Mn, less than or equal to 0.17 percent of Si, less than or equal to 0.19 percent of P, 0.20 to 0.38 percent of S, 0.01 to 0.35 percent of Sb, 0.02 to 0.41 percent of Zr, 0.009 to 0.023 percent of O, less than or equal to 0.01 percent of Al, less than or equal to 0.008 percent of N and the balance of Fe. In the invention, the free-machining steel material is prepared in an economic superior mode; and the machinability of the free-machining steel material is improved on the premise of ensuring the mechanical property of the material.

The present invention provides a low-carbon resulfurized free machining steel product excellent in machinability typified by finished surface roughness even though toxic Pb or special elements such as Bi or Te are not added, and a suitable production method thereof. A steel product has a specific composition, has contents of Mn and S satisfying the following conditions: 0.40 Mn*S 1.2 and Mn/S 3.0, and contains a ferrite-pearlite structure as the metallographic structure, in which the average width ( m) of sulfide inclusions in the steel product is 2.8* (log d) or more, wherein d (mm) is the diameter of the steel product, and pro-eutectoid ferrite in the metallographic structure has a hardness HV of 133 to 150 or a difference in deformation resistance at a strain of 0.3 between 200 DEG C and 25 DEG C is 110 MPa or more and 200 MPa or less, the deformation resistances being determined in a compression test at a deformation rate of 0.3 mm/min.

The invention belongs to the field of metallurgy and relates to rolling process of lead-containing free-machining steel. A rolling mill is used for rolling, in the rough rolling process, the rolling temperature is controlled at 1030-1060 DEG C, the former three-pass material form is reduced 1-3mm based on the standard material form; in the intermediate rolling process, the roll material form is the standard material form, and the rolling temperature is controlled at 980-1030 DEG C; in the pre-finish rolling process, the roll material form is the standard material form, the rolling temperature is controlled at 1060-1030 DEG C, and the temperature of the rolled piece reaches 1005-1040 DEG C after the pre-finish rolling process; in the finish rolling process, the temperature of the rolled piece in a finishing mill is less than 980 DEG C, the roll material form is the standard material form, and the rolling temperature is controlled at 1020-1050 DEG C. The rolling process can prevent steel heaping caused by the cleavage crack of the cold, hot and frailty susceptible head of the rolled piece, prevent sliding accident caused by the high temperature of the steel, steadily increase the yield of the lead-containing free-machining steel, obviously reduce the waste, and greatly reduce the 100t steel fault time.

The present invention provides a low-carbon resulfurized free machining steel product excellent in machinability typified by finished surface roughness even though toxic Pb or special elements such as Bi or Te are not added, and a suitable production method thereof. A steel product has a specific composition, has contents of Mn and S satisfying the following conditions: 0.40≦Mn*S≦1.2 and Mn/S≧3.0, and contains a ferrite-pearlite structure as the metallographic structure, in which the average width (μm) of sulfide inclusions in the steel product is 2.8*(log d) or more, wherein d (mm) is the diameter of the steel product, and pro-eutectoid ferrite in the metallographic structure has a hardness HV of 133 to 150 or a difference in deformation resistance at a strain of 0.3 between 200° C. and 25° C. is 110 MPa or more and 200 MPa or less, the deformation resistances being determined in a compression test at a deformation rate of 0.3 mm/min.

Provided is a lead-containing free-machining steel having excellent machinability. This lead-containing free-machining steel contains, in terms of mass%, 0.005-0.2% C, 0.3-2.0% Mn, 0.005-0.2% P, 0.01-0.7% S, 0.03-0.5% Pb, 0.004-0.02% N, and 0.003-0.03% O, with the remainder comprising Fe and impurities. The steel contains Pb inclusions (40) having a diameter of 0.01-0.5 μm in terms of equivalent-circle diameter, the number of the inclusions being 10,000 per mm2 or larger.

The invention belongs to the technical fields of metallographic preparation and nonmetal inclusion control, and especially relates to a method for developing the austenite grain boundary of sulfur free-machining steel through electrolytic corrosion. The method comprises the following steps: S1, preparing a sample; S2, preparing an electrolyte; S3, performing the electrolytic corrosion; S4, treating a steel sample; and S5, carrying out metallographic observation. The method for developing the austenite grain boundary of sulfur free-machining steel through electrolytic corrosion allows the austenite grain boundary of the sulfur free-machining steel to be clearly displayed, the sulfur free-machining steel also contains manganese sulfide, the method does not damages the original morphology ofthe manganese sulfide in the electrolytic corrosion process, and the enforcement process of the method is stable and safe, is simple to operate, and can be easily controlled.

The invention relates to a tin-calcium ¿Ctitanium free machining steel that belongs to metallic material field, especially to manufacture high strength bolt, crankshaft, connecting bar, etc. that is the important part of automobile or mechanism. The Y15SnCaTi free machining steel contains carbon content 0.12-0.18% has the following mechanical properties: tensile strength reaches 400MPa, specific elongation is 22.0%, contraction of area is 37%, hardness of HB is less than 170 that has reached the standard of the corresponding steel of Y15Pb in GB8731-88 that can be used to manufacture high strength bolt. The Y45SnCaTi free machining steel has the following mechanical properties: tensile strength reaches 800MPa, specific elongation is 17.7%, contraction of area is 47%, and the hardness of HB is less than 240 that have reached the standard of the corresponding steel of Y45Ca in GB8731-88 that can be used to manufacture crankshaft and connecting bar.

The invention discloses a bismuth-titanium alloy, and belongs to the technical field of the preparation of free-machining alloy steel. The bismuth-titanium alloy comprises the following components in percentage by weight: 15 to 75 weight percent of bismuth, less than or equal to 0.8 weight percent of inevitable impurities, and the balance of titanium. The invention has the characteristics that the alloying treatment is feasible, the yield of the bismuth is high and the like; and the bismuth-titanium alloy is applicable to additives of alloying treatment of free-machining steel.