Ultra-high strength strapping raw sheet and manufacturing method thereof

A manufacturing method and ultra-high-strength technology, applied in the field of strapping steel, can solve the problems of low toughness of strapping steel, complex equipment, environmental pollution, etc., and achieve the effect of reducing cross-sectional size, reducing steel consumption, and broad application prospects.

Inactive Publication Date: 2013-10-23
ANGANG STEEL CO LTD
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Problems solved by technology

[0003] To sum up, there are currently four main production processes for high-strength strapping steel: one is the process of annealing after strengthening by cold rolling, making full use of the work hardening of cold rolling. The strapping steel manufactured by this process has low toughness and performance is affected. The influence of raw materials is greater; the second is the bainite strengthening process using lead bath isothermal quenching, but the equipment is complicated, especially the use of

Method used

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Embodiment Construction

[0018] The 1250MPa class ultra-high-strength strapping original plate of the present invention is produced by smelting, casting, hot rolling, pickling, and cold rolling. Its chemical composition is shown in Table 1, and its manufacturing process is shown in Table 2. The chemical compositions of serial numbers 1 to 3 in Table 1 correspond to the process of serial number 1 in Table 2; the chemical compositions of serial numbers 4 to 6 in Table 1 correspond to the process of serial number 2 in Table 2; The chemical composition corresponds to the process of serial number 3 in Table 2; the chemical composition of serial number 10 and 11 in table 1 corresponds to the process of serial number 4 in table 2; the chemical composition of serial number 12 and 13 in table 1 corresponds to the serial number in table 2 The process of 5 corresponds; the chemical composition of No. 14 and No. 15 in Table 1 corresponds to the process of No. 6 in Table 2 respectively.

[0019] Table 1 Chemical c...

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Abstract

The invention provides an ultra-high strength strapping raw sheet and a manufacturing method thereof. The raw sheet comprises the following chemical components by weight percent: 0.15-0.60% of C, 0.25-1.80% of Si, 1.0-3.5% of Mn, the balance of Fe and inevitable impurities, wherein one or more of 0.05-1.00% of Cr, 0.05-0.50% of Ni, 0.01-0.50% of Mo, 0.002-0.010% of B, 0.01-0.10% of Ti, 0.01-0.10% of V, and 0.01-0.10% of Nb also can be added to the steel. The manufacturing method of the raw sheet mainly adopts the processes of smelting, casting, hot rolling, pickling and cold rolling; the hot rolling finishing temperature is 850-950 DEG C; the hot-rolling coiling temperature is 550-750 DEG C; and the cold rolling reduction ratio is 50-70%. The tensile strength of the raw sheet disclosed by the invention after the process of isothermal quenching, or quenching and tempering can achieve over 1250 MPa; the extensibility can be up to over 12%; the requirements of wool and cotton packaging on the high strength and high tenacity are met; the section size of the strapping steel is reduced; consumption of steel products is reduced; and the ultra-high strength strapping raw sheet has a broad popularization and application prospect.

Description

technical field [0001] The invention belongs to the field of strapping steel, and in particular relates to an ultra-high-strength strapping original plate and a manufacturing method thereof. Background technique [0002] In the field of strapping steel, in order to improve the efficiency of steel use, ensure packaging quality, and meet the requirements of various industries, high-strength strapping steel and its manufacturing technology have been continuously developed. Higher requirements for toughness. CN95103707.2 adopts aluminum-killed steel with a carbon content of 0.20%-0.25%, a manganese content of 0.30%-0.60%, and a ratio of boron to free nitrogen of 1.07-1.43. The coiling temperature is 600 ° C, and the cold rolling reduction is about 80 %, the tensile strength of the manufactured strap steel is 880-1090MPa, and the elongation is not more than 4%. The strap needs to be galvanized; CN02109635. 1.5%, aluminum content ≥ 0.015%, niobium content ≥ 0.012% of the chilled...

Claims

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Application Information

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IPC IPC(8): C22C38/04C21D8/02
Inventor 李锋刘仁东吕家舜杨洪刚李文斌贾吉祥黄秋菊
Owner ANGANG STEEL CO LTD
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