Preparation method of high-strength and high-toughness steel NG01K for packaging bundling belt
A high-toughness, high-strength technology, applied in the field of steel materials, can solve the problems of insufficient repeated bending times, poor processability, low elongation, etc., to achieve improved processing performance, improved mechanical properties, and high purity of steel Effect
Inactive Publication Date: 2018-10-30
NINGBO IRON & STEEL
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Problems solved by technology
[0003] Manufacturers of steel for high-strength and high-toughness packaging strapping report that there are three main problems in the medium-carbon steel materials currently used: (1) poor processability; (2) low elongation; (3) insufficient number of repeated bending; (4) ) low intensity
[0004] China has not yet developed a low-cost carbon and manganese plus a little micro-alloy steel to control rolling, controlled cooling, tempering and other means, through the interaction of micro-alloy carbonitride dispersion precipitation and dislocation, to obtain a significant strengthening effect, To meet the production needs of customers in cold rolling, hardening, slitting, heat treatment and other processes, produce special steel for high-strength and high-toughness packaging strapping, and replace ST50, AFD1, 30Mn2 steel to become the next generation of high-strength and high-toughness carbon steel special materials for packaging
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Embodiment 1
[0025] (1) Composition design
[0026] The design chemical composition of NG01K steel is: C: 0.29~0.35%, Si: 0.10~0.30%, Mn: 1.2~1.8%, P≤0.025%, S≤0.005%, Als: 0.010~0.060%, Nb: 0.020~ 0.035%, the balance is Fe and unavoidable impurities.
[0027] The production process is: hot metal desulfurization→converter blowing→LF refining→RH vacuum refining (calcium treatment)→continuous casting→hot direct loading→soaking→rough rolling→finish rolling→laminar cooling→coiling→slow cooling before delivery.
[0028] (2) Smelting technology
[0029] Desulfurization of molten iron to [S]≤0.005%;
[0030] Bottom blowing in converter smelting is switched with nitrogen and argon; tapping adopts slag blocking and tapping, strictly controlling the amount of slag in converter; tapping alloying with addition of Si, Mn alloys and recarburizers;
[0031] LF refining requires good argon blowing at the bottom of the ladle; the upper LF furnace treats the white slag produced in the ladle furnace, and ...
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Abstract
The invention relates to a preparation method of high-strength and high-toughness steel NG01K for packaging and bundling. The preparation method comprises the steps that (1) component design is conducted; and (2) the steel NG01K is obtained through molten iron desulphurization, converter converting, LF refining, RH vacuum refining, continuous casting, direct hot assembly, soaking, rough rolling, finish rolling, laminar cooling, reeling and slow cooling delivery. The mechanical property and the machining and using properties of the steel are improved, the obtained steel has good strength and toughness, the hot rolling yield strength is 500 MP or above, the tensile strength is 680 MP or above, and the elongation percentage is 22% or above.
Description
technical field [0001] The invention belongs to the field of steel materials, and in particular relates to a preparation method of steel NG01K for high-strength and high-toughness packaging strapping. Background technique [0002] Domestically produced high-strength and high-toughness packaging steel materials are mainly used for packaging and exporting high-compression ratio materials, high-elastic materials, petroleum, and pipelines. In recent years, their production volume has gradually increased. The steel used to produce high-strength and high-toughness packaging straps is mainly medium-high carbon steel. The steel grades mainly include Ningshan Iron and Steel NG01K, Baosteel ST50, Anshan Iron and Steel AFD1, and Nanjing Iron and Steel 30Mn2. The amount of steel used for high-strength and high-toughness packaging straps reaches 10,000 tons per year. [0003] Manufacturers of steel for high-strength and high-toughness packaging strapping report that there are three main...
Claims
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IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/06C22C38/12C21C7/00C21C7/064C21C7/10C21D8/02
Inventor 蔡明伟殳黎平胡文豪闫江辉骆仁智李洪鹏杨志强贾国军赵彦灵
Owner NINGBO IRON & STEEL