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Hot-rolled thin-specification anti-seismic refractory steel plate with yield strength of 460 MPa and preparation method

A technology with yield strength and thin gauge, applied in the field of thin gauge anti-seismic fire-resistant steel plate with yield strength of 460MPa and its preparation, can solve the problems of difficulty in guaranteeing high-temperature performance, high cost of Mo element, and difficulty in producing thin-gauge anti-seismic fire-resistant steel. Reduce the difficulty of manufacturing, improve the performance pass rate, and the effect of good room temperature strength

Inactive Publication Date: 2021-04-23
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Purpose of the invention: The purpose of the present invention is to provide a thin-gauge anti-seismic fire-resistant steel plate with a yield strength of 460 MPa and its preparation method to solve the problems of high cost of Mo element, difficulty in ensuring high-temperature performance, and difficulty in producing thin-gauge anti-seismic fire-resistant steel

Method used

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  • Hot-rolled thin-specification anti-seismic refractory steel plate with yield strength of 460 MPa and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for manufacturing a hot-rolled thin-spec seismic refractory steel with a yield strength of 460 MPa with a thickness of 5 mm, comprising the following process steps:

[0017] (1) After the converter smelting process, the refining process outside the furnace, and the continuous casting process of molten steel pouring, the slabs with a thickness of 220mm and a length of 4000mm are casted respectively. The chemical composition of the slabs is: C: 0.04%, Si: 0.24%, Mn: 0.90%, P: 0.010%, S: 0.009%, Cr: 048%, Mo: 0.18%, Nb: 0.090%, V: 0.030%, Ti: 0.015%, Al: 0.03%, N: 0.0040%, The rest are Fe and inevitable impurity elements.

[0018] (2) The slab is heated in a heating furnace to obtain the original billet: the heating temperature is 1170 ° C, and the furnace time is 220 minutes, and a fine and uniform original austenite structure is obtained inside the steel;

[0019] (3) Roll the original billet into an intermediate billet with a thickness of 110mm and cool it nat...

Embodiment 2

[0023] A method for manufacturing a hot-rolled thin-spec seismic refractory steel with a yield strength of 460 MPa with a thickness of 8 mm, comprising the following process steps:

[0024] (1) Through the converter smelting process, the refining process outside the furnace, and the continuous casting billet process of molten steel pouring into a billet with a thickness of 220mm and a length of 4000mm, the chemical composition of the billet is: C: 0.05%, Si: 0.25%, Mn : 0.850%, P: 0.009%, S: 0.008%, Cr: 0.60%, Mo: 0.20%, Nb: 0.08%, V: 0.03%, Ti: 0.019%, Al: 0.032%, N: 0.0040%, the rest Fe and inevitable impurity elements

[0025] (2) The slab is heated in a heating furnace to obtain the original billet: the heating temperature is 1180 ° C, and the furnace time is 220 minutes, and a fine and uniform original austenite structure is obtained inside the steel;

[0026] (3) Roll the original billet into an intermediate billet with a thickness of 120mm and cool it naturally, and th...

Embodiment 3

[0030] A method for manufacturing a hot-rolled thin-spec seismic refractory steel with a yield strength of 460 MPa with a thickness of 10 mm, comprising the following process steps:

[0031] (1) Through the converter smelting process, the refining process outside the furnace, and the continuous casting billet process of molten steel pouring into a billet with a thickness of 220mm and a length of 4000mm, the chemical composition of the billet is: C: 0.06%, Si: 0.21%, Mn : 0.91%, P: 0.008%, S: 0.008%, Cr: 0.50%, Mo: 0.018%, Nb: 0.09%, V: 0.04%, Ti: 0.01809%, Al: 0.03%, N: 0.0050%, the rest Fe and inevitable impurity elements

[0032] (2) The slab is heated in a heating furnace to obtain the original billet: the heating temperature is 1216 ° C, and the furnace time is 220 minutes, and a fine and uniform original austenite structure is obtained inside the steel;

[0033] (3) The billet rolling process of the medium and heavy plate rolling mill: the original billet is rolled into ...

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Abstract

The invention discloses a hot-rolled thin-specification anti-seismic refractory steel plate with the yield strength of 460 MPa. The steel plate comprises the following raw materials in percentage by mass: 0.03-0.09% of C, 0.10-0.40% of Si, 0.80-1.2% of Mn, less than or equal to 0.015% of P, less than or equal to 0.01% of S, 0.40-0.80% of Cr, 0.15-0.25% of Mo, 0.08-0.12% of Nb, 0.02-0.06% of V, 0.006-0.03% of Ti, 0.01-0.05% of Al, less than or equal to 0.0050% of N and the balance of Fe and inevitable impurity elements. The structure composition of the refractory steel is controlled, the production cost is reduced, the prepared thin-specification refractory steel plate has good room-temperature strength, high elongation, excellent subzero 40 DEG C low-temperature impact toughness and excellent 600 DEG C high-temperature tensile property, the production and manufacturing difficulty of the thin-specification anti-seismic refractory steel is reduced, and the performance qualification rate is increased.

Description

technical field [0001] The invention relates to a steel plate and its preparation, in particular to a thin-spec seismic-resistant fire-resistant steel plate with a yield strength of 460 MPa and a preparation method. Background technique [0002] At present, the refractory steel plates developed at home and abroad are mainly designed by the composition of high Mo, and mainly use the strong high temperature solid solution strengthening effect of Mo to ensure the high temperature strength below 600 ℃, usually adding not less than 0.5wt.% Mo and Nb, V, Ti microalloying. In order to reduce the cost, the Mo content will decrease, but it is still about 0.3%. For example, Chinese patent 202010053131.1 discloses a seismic-resistant refractory steel and its preparation method, in which 0.51-0.60% Mo is added, and a two-stage controlled rolling process is adopted. Production; Chinese Patent 201910002022.4 discloses a kind of high-strength building structure anti-seismic refractory ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/74B21C37/02C21D8/02C22C38/00C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/28
CPCB21C37/02B21B37/74C22C38/28C22C38/02C22C38/04C22C38/06C22C38/14C21D8/0205C21D8/0226C22C38/001C22C38/12C21D2211/002
Inventor 秦玉荣孟令明邓伟崔强陈林恒王军唐春霞
Owner NANJING IRON & STEEL CO LTD
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